Document Type : Narrative and integrative review
Authors
1 Researcher, Genomics Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Isfahan, Iran
2 Associate Professor, Secondary Metabolites Research Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Isfahan, Iran.
Abstract
Background and Objective: As one of the most widely consumed beverages globally, tea generates a significant volume of waste, often disposed of without proper utilization. With increasing global tea production, managing this waste has become a critical environmental challenge. The aim of this study is to provide a comprehensive review of innovations in tea waste utilization and explore its value-added potentials in various fields.
Materials and Methods: This study was conducted as a narrative review, examining published research on tea waste, focusing on processing technologies, conversion methods, and novel applications. These applications include the production of biochar, biofuels, biogas, bioplastics, supercapacitors, aerogels, hydrogels, and composite nanomaterials.
Results: The findings indicate that tea waste has a high potential for producing value-added products of bioactive compounds, biosorbents, and receptive energy sources. Also, innovative applications in processing these wastes can play an effective role in reducing waste, improving resource management, and developing their applications in the plant, animal, and environmental sectors.
Conclusion: Comprehensive and sustainable use of tea wastes, in regulating the principles of circular economy and non-consumption environment, can be used as a solution for environmental reduction, economic efficiency, and a suitable replacement for conventional biomass resources. By providing an integrated perspective, this study can help develop scientific and industrial research and decision-making in the field of sustainable utilization of tea wastes.
Open Access Policy: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/
Keywords
- Farag MA, Elmetwally F, Elghanam R, Kamal N, Hellal K, Hamezah HS, et al. Metabolomics in tea products; a compile of applications for enhancing agricultural traits and quality control analysis of Camellia sinensis. Food Chemistry. 2023;404:134628.
-
Statista. Global: annual tea consumption. 2022 (2012-2025) | Statista. https://www.statist a.com/statistics/940102/global-tea-consumption/. Accessed June 12. 2023.
- Weerawatanakorn M, Hung W-L, Pan M-H, Li S, Li D, Wan X, et al. Chemistry and health beneficial effects of oolong tea and theasinensins. Food Science and Human Wellness. 2015;4(4):133–46.
- Kosińska A, Andlauer W. Antioxidant capacity of tea: effect of processing and storage. Processing and impact on antioxidants in beverages: Elsevier; 2014. p. 109–20.
- Jin J-Q, Qu F-R, Huang H, Liu Q-S, Wei M-Y, Zhou Y, et al. Characterization of two O-methyltransferases involved in the biosynthesis of O-methylated catechins in tea plant. Nature communications. 2023;14(1):5075.
- Morlock GE, Heil J, Inarejos-Garcia AM, Maeder J. Effect-directed profiling of powdered tea extracts for catechins, theaflavins, flavonols and caffeine. Antioxidants. 2021;10(1):117.
- Zahra A, Lim S-K, Shin S-J, Yeon I-J. Properties of green tea waste as cosmetics ingredients and rheology enhancers. Applied Sciences. 2022;12(24):12871.
- Yılmaz C, Özdemir F, Gökmen V. Investigation of free amino acids, bioactive and neuroactive compounds in different types of tea and effect of black tea processing. Lwt. 2020;117:108655.
- Xu J, Wei Y, Huang Y, Weng X, Wei X. Current understanding and future perspectives on the extraction, structures, and regulation of muscle function of tea pigments. Critical Reviews in Food Science and Nutrition. 2023;63(33):11522–44.
- Liu G, Zhu W, Zhang J, Song D, Zhuang L, Ma Q, et al. Antioxidant capacity of phenolic compounds separated from tea seed oil in vitro and in vivo. Food Chemistry. 2022;371:131122.
- Debnath B, Haldar D, Purkait MK. Environmental remediation by tea waste and its derivative products: A review on present status and technological advancements. Chemosphere. 2022;300:134480.
- Debnath B, Haldar D, Purkait MK. Potential and sustainable utilization of tea waste: A review on present status and future trends. Journal of Environmental Chemical Engineering. 2021;9(5):106179.
- Guo S, Awasthi MK, Wang Y, Xu P. Current understanding in conversion and application of tea waste biomass: A review. Bioresource Technology. 2021;338:125530.
- Chen L, Wang H, Ye Y, Wang Y, Xu P. Structural insight into polyphenol oxidation during black tea fermentation. Food Chemistry: X. 2023;17:100615.
- Danmatam N, Pearce J, Pattavarakorn D. UV-blocking properties of carboxymethyl cellulose film integrated with oolong tea extracts as eco-friendly packaging film. Materials Today: Proceedings. 2023;77:1052–8.
- Beaudor M, Vauchel P, Pradal D, Aljawish A, Phalip V. Comparing the efficiency of extracting antioxidant polyphenols from spent coffee grounds using an innovative ultrasound-assisted extraction equipment versus conventional method. Chemical Engineering and Processing-Process Intensification. 2023;188:109358.
- Rajapaksha S, Shimizu N. Pilot-scale extraction of polyphenols from spent black tea by semi-continuous subcritical solvent extraction. Food Chemistry: X. 2022;13:100200.
- Ravindran R, Desmond C, Jaiswal S, Jaiswal AK. Optimisation of organosolv pretreatment for the extraction of polyphenols from spent coffee waste and subsequent recovery of fermentable sugars. Bioresource Technology Reports. 2018;3:7–14.
- İçen H, Gürü M. Effect of ethanol content on supercritical carbon dioxide extraction of caffeine from tea stalk and fiber wastes. The Journal of Supercritical Fluids. 2010;55(1):156–60.
- Yuan Y, Ma M, Zhang S, Wang D. Efficient utilization of tea resources through encapsulation: dual perspectives from core material to wall material. Journal of Agricultural and Food Chemistry. 2023;71(3):1310–24.
- Rajapaksha SW, Shimizu N. Development and characterization of functional starch-based films incorporating free or microencapsulated spent black tea extract. Molecules. 2021;26(13):3898.
- Debnath B, Purkait MK. Sustainable utilization of tea waste. Agricultural Waste: Environmental Impact, Useful Metabolites and Energy Production: Springer; 2023. p. 245–75.
- Chowdhury A, Sarkar S, Chowdhury A, Bardhan S, Mandal P, Chowdhury M. Tea waste management: a case study from West Bengal, India. Indian Journal of Science and Technology. 2016;9(42):1–6.
- Sui W, Xiao Y, Liu R, Wu T, Zhang M. Steam explosion modification on tea waste to enhance bioactive compounds' extractability and antioxidant capacity of extracts. Journal of Food Engineering. 2019;261:51–9.
- Ozsefil IC, Ziylan-Yavas A. Green approach for polyphenol extraction from waste tea biomass: Single and hybrid application of conventional and ultrasound-assisted extraction. Environmental Research. 2023;235:116703.
- Abdeltaif SA, SirElkhatim KA, Hassan AB. Estimation of phenolic and flavonoid compounds and antioxidant activity of spent coffee and black tea (processing) waste for potential recovery and reuse in Sudan. Recycling. 2018;3(2):27.
- Mago M, Yadav A, Gupta R, Garg V. Management of banana crop waste biomass using vermicomposting technology. Bioresource Technology. 2021;326:124742.
- Gao P, Ogata Y, Liu J, Song C, editors. The methods of tea waste reutilization and economic benefits analysis. 2017 5th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 2017); 2017: Atlantis Press.
- Amarasinghe B, Williams RA. Tea waste as a low cost adsorbent for the removal of Cu and Pb from wastewater. Chemical engineering journal. 2007;132(1-3):299–309.
- Ko S, Yang C. Effect of green tea probiotics on the growth performance, meat quality and immune response in finishing pigs. Asian-Australasian Journal of Animal Sciences. 2008;21(9):1339–47.
- Khan A, Senthil RA, Pan J, Osman S, Sun Y, Shu X. A new biomass derived rod-like porous carbon from tea-waste as inexpensive and sustainable energy material for advanced supercapacitor application. Electrochimica acta. 2020;335:135588.
- Faustino M, Veiga M, Sousa P, Costa EM, Silva S, Pintado M. Agro-food byproducts as a new source of natural food additives. Molecules. 2019;24(6):1056.
- Jayakala Devi R, Usha R, Rajkishore S, Raveendran M. Development of economic value-added products from tea waste by thermal and microbial process for environmental sustainability. Biomass Conversion and Biorefinery. 2024;15(4):5111–40.
- Wang C, Zhong Y, Liu H, Wang H, Li Y, Wang Q, et al. Effects of dietary supplementation with tea residue on growth performance, digestibility, and diarrhea in piglets. Animals. 2024;14(4):584.
- Kumar V, Bhat SA, Kumar S, Verma P, Badruddin IA, Américo-Pinheiro JHP, et al. Tea byproducts biorefinery for bioenergy recovery and value-added products development: A step towards environmental sustainability. Fuel. 2023;350:128811.
- Zheng Q, Han C, Zhong Y, Wen R, Zhong M. Effects of dietary supplementation with green tea waste on growth, digestive enzyme and lipid metabolism of juvenile hybrid tilapia, Oreochromis niloticus× O. aureus. Fish physiology and biochemistry. 2017;43(2):361–71.
- Nagaraja M, Charles I, Sundaresan R, Natarajan R, Srinivas T. Energy and byproducts recovery from tea waste. Int J Electr Energy. 2013;1(1):49–54.
- Tutuş A, Kazaskeroğlu Y, Çiçekler M. Evaluation of tea wastes in usage pulp and paper production. BioResources. 2015;10(3):5407–16.
- Thiruvengadam V, Baharuddin NHB, Shiun LJ. Implementation of life cycle analysis on green tea process. Heliyon. 2023;9(5).
- Bazaluk O, Yatsenko O, Zakharchuk O, Ovcharenko A, Khrystenko O, Nitsenko V. Dynamic development of the global organic food market and opportunities for Ukraine. Sustainability. 2020;12(17):6963.
- Ma Q, Xi H, Cui F, Zhang J, Chen P, Cui T. Self-templating synthesis of hierarchical porous carbon with multi-heteroatom co-doping from tea waste for high-performance supercapacitor. Journal of Energy Storage. 2022;45:103509.
- Ramdani D, Jayanegara A, Chaudhry AS. Biochemical properties of black and green teas and their insoluble residues as natural dietary additives to optimize in vitro rumen degradability and fermentation but reduce methane in sheep. Animals. 2022;12(3):305.
- Chutia S, Saikia A, Konwar B, Baruah K, editors. Water treated factory tea waste and pig production. Proceedings of the National Symposium on feeding systems for maximising livestock production, HAU, Hissar; 1983.
- Konwar BK, Das PC. Tea waste–a new livestock and poultry feed. Technical bulletin. 1990;2:1–9.
- Sundod R, Poothong S, Nuengjamnong C. Substitution effect of protein source with tea waste on productive performances and ruminal fermentation in crossbred Saanen lactating goats. Italian Journal of Animal Science. 2023;22(1):453–62.
- Bortolini DG, Haminiuk CWI, Pedro AC, Fernandes IdAA, Maciel GM. Processing, chemical signature and food industry applications of Camellia sinensis teas: An overview. Food Chemistry: X. 2021;12:100160.
- Abdel‐Tawwab M, Ahmad MH, Seden ME, Sakr SF. Use of green tea, Camellia sinensis L., in practical diet for growth and protection of Nile tilapia, Oreochromis niloticus (L.), against Aeromonas hydrophila infection. Journal of the World Aquaculture Society. 2010;41:203–13.
- Kondo M, Nakano M, Kaneko A, Agata H, Kita K, Yokota H-o. Ensiled green tea waste as partial replacement for soybean meal and alfalfa hay in lactating cows. Asian-Australasian Journal of Animal Sciences. 2004;17(7):960–6.
- Chowdhury MR, Chanda S, Shipa A, Saiyara T, Chowdhury ZJ, Khan MMH. Effect of heat‐treated green tea waste feeding on fermentation kinetics, in vitro degradability, in vivo apparent digestibility, nitrogen balance, and blood metabolites in Black Bengal goat. Animal Science Journal. 2022;93(1):e13704.
- Liu W, Rouzmehr F, Seidavi A. Effect of amount and duration of waste green tea powder on the growth performance, carcass characteristics, blood parameters, and lipid metabolites of growing broilers. Environmental Science and Pollution Research. 2018;25(1):375–87.
- Zhuang X, Chen Z, Sun X, Li F, Luo J, Chen T, et al. Fermentation quality of herbal tea residue and its application in fattening cattle under heat stress. BMC Veterinary Research. 2021;17(1):348.
- Yan P, Shen C, Fan L, Li X, Zhang L, Zhang L, et al. Tea planting affects soil acidification and nitrogen and phosphorus distribution in soil. Agriculture, ecosystems & environment. 2018;254:20–5.
- Le VS, Herrmann L, Hudek L, Nguyen TB, Bräu L, Lesueur D. How application of agricultural waste can enhance soil health in soils acidified by tea cultivation: a review. Environmental Chemistry Letters. 2022;20(1):813–39.
- Siedt M, Schäffer A, Smith KE, Nabel M, Roß-Nickoll M, Van Dongen JT. Comparing straw, compost, and biochar regarding their suitability as agricultural soil amendments to affect soil structure, nutrient leaching, microbial communities, and the fate of pesticides. Science of the Total Environment. 2021;751:141607.
- Pan L, Mao L, Zhang H, Wang P, Wu C, Xie J, et al. Modified biochar as a more promising amendment agent for remediation of pesticide-contaminated soils: Modification methods, mechanisms, applications, and future perspectives. Applied Sciences. 2022;12(22):11544.
- Tarashkar M, Matloobi M, Qureshi S, Rahimi A. Assessing the growth-stimulating effect of tea waste compost in urban agriculture while identifying the benefits of household waste carbon dioxide. Ecological Indicators. 2023;151:110292.
- Seth D, Athparia M, Singh A, Rathore D, Venkatramanan V, Channashettar V, et al. Sustainable environmental practices of tea waste—a comprehensive Environmental Science and Pollution Research. 2025;32(12):7449–67.
- De Corato U. Agricultural waste recycling in horticultural intensive farming systems by on-farm composting and compost-based tea application improves soil quality and plant health: A review under the perspective of a circular economy. Science of the Total Environment. 2020;738:139840.
- Ahsan MA, Katla SK, Islam MT, Hernandez-Viezcas JA, Martinez LM, Díaz-Moreno CA, et al. Adsorptive removal of methylene blue, tetracycline and Cr (VI) from water using sulfonated tea waste. Environmental Technology & Innovation. 2018;11:23–40.
- Mahaly M, Senthilkumar AK, Arumugam S, Kaliyaperumal C, Karupannan N. Vermicomposting of distillery sludge waste with tea leaf residues. Sustainable Environment Research. 2018;28(5):223–7.
- Lazcano C, Domínguez J. The use of vermicompost in sustainable agriculture: impact on plant growth and soil fertility. Soil nutrients. 2011;10(1-23):187.
- Rao JM, Natarajan CP, Seshadri R. A study on the occurrence of N‐triacontanol, a plant growth regulator, in tea. Journal of the Science of Food and Agriculture. 1987;39(2):95–9.
- Pane C, Palese AM, Spaccini R, Piccolo A, Celano G, Zaccardelli M. Enhancing sustainability of a processing tomato cultivation system by using bioactive compost teas. Scientia Horticulturae. 2016;202:117–24.
- Elbasiouny H, Darwesh M, Elbeltagy H, Abo-Alhamd FG, Amer AA, Elsegaiy MA, et al. Ecofriendly remediation technologies for wastewater contaminated with heavy metals with special focus on using water hyacinth and black tea wastes: a review. Environmental monitoring and assessment. 2021;193(7):449.
- Elbehiry F, Alshaal T, Elhawat N, Elbasiouny H. Environmental-friendly and cost-effective agricultural wastes for heavy metals and toxicants removal from wastewater. Cost-Efficient Wastewater Treatment Technologies: Natural Systems: Springer; 2021. p. 107–27.
- Zhang S, Liu C, Yuan Y, Fan M, Zhang D, Wang D, et al. Selective, highly efficient extraction of Cr (III), Pb (II) and Fe (III) from complex water environment with a tea residue derived porous gel adsorbent. Bioresource Technology. 2020;311:123520.
- Hussain S, Anjali K, Hassan ST, Dwivedi PB. Waste tea as a novel adsorbent: a review. Applied Water Science. 2018;8(6):165.
- Patil CS, Gunjal DB, Naik VM, Harale NS, Jagadale SD, Kadam AN, et al. Waste tea residue as a low cost adsorbent for removal of hydralazine hydrochloride pharmaceutical pollutant from aqueous media: An environmental remediation. Journal of cleaner production. 2019;206:407–18.
- Wu J, Annath H, Chen H, Mangwandi C. Upcycling tea waste particles into magnetic adsorbent materials for removal of Cr (VI) from aqueous solutions. Particuology. 2023;80:115–26.
- Shirvanimoghaddam K, Czech B, Tyszczuk-Rotko K, Kończak M, Fakhrhoseini SM, Yadav R, et al. Sustainable synthesis of rose flower-like magnetic biochar from tea waste for environmental applications. Journal of Advanced Research. 2021;34:13–27.
- Fatma UK, Nizami G, Ahamad S, Hussain MK. Efficient removal of Pb2+, Cu2+ and Zn2+ by waste tea‐derived cost‐effective bioadsorbent. ChemistrySelect. 2023;8(30):e202300944.
- Majid RA, Mohamad Z, Rusman R, Zulkornain AA, Halim NA, Abdullah M, et al. Development of tea waste/kapok fiber composite paper. Chemical Engineering Transactions. 2018;63:457–62.
- Hayeemasae N, Ismail H. Application of silane-treated tea waste powder as a potential filler for natural rubber composites. BioResources. 2021;16(1):1230.
- Simão L, Hotza D, Raupp-Pereira F, Labrincha J, Montedo O. Wastes from pulp and paper mills-a review of generation and recycling alternatives. Cerâmica. 2018;64(371):443–53.
- Badhwar VK, Singh S, Singh B. Biotransformation of paper mill sludge and tea waste with cow dung using vermicomposting. Bioresource Technology. 2020;318:124097.
- Baltrusch K, Torres M, Domínguez H, Flórez-Fernández N. Spray-drying microencapsulation of tea extracts using green starch, alginate or carrageenan as carrier materials. International Journal of Biological Macromolecules. 2022;203:417–29.
- Pirozzi A, Donsì F. Impact of high-pressure homogenization on enhancing the extractability of phytochemicals from Agri-food residues. Molecules. 2023;28(15):5657.
- Rajapaksha D, Shimizu N. Valorization of spent black tea by recovery of antioxidant polyphenolic compounds: Subcritical solvent extraction and microencapsulation. Food Science & Nutrition. 2020;8(8):4297–307.
- Soobhany N. Insight into the recovery of nutrients from organic solid waste through biochemical conversion processes for fertilizer production: A review. Journal of Cleaner Production. 2019;241:118413.
- Zhang Y, Jiang S, Qiu L, Xu K, Kang X, Wang L. Performance and mechanism of tea waste biochar in enhancing the removal of tetracycline by peroxodisulfate. Environmental Science and Pollution Research. 2022;29(18):27595–605.
- Li B, Huang Y, Wang Z, Li J, Liu Z, Fan S. Enhanced adsorption capacity of tetracycline on tea waste biochar with KHCO3 activation from aqueous solution. Environmental Science and Pollution Research. 2021;28(32):44140–51.
- Yan P, Shen C, Zou Z, Fu J, Li X, Zhang L, et al. Biochar stimulates tea growth by improving nutrients in acidic soil. Scientia Horticulturae. 2021;283:110078.
- Abdolahi Arshad M, Rangzan N, Nadian Ghomsheh H. Effect of spent tea waste, compost and biochar on some growth parameters and concentration of nitrogen, phosphorus and potassium in spinach (Spinacia oleracea L.) under salinity stress. Journal of Plant Nutrition. 2024;47(7):1029–44.
- Zhang N, Reguyal F, Praneeth S, Sarmah AK. A green approach of biochar-supported magnetic nanocomposites from white tea waste: Production, characterization and plausible synthesis mechanisms. Science of the Total Environment. 2023;886:163923.
- Feng C, Zhang L, Zhang X, Li J, Li Y, Peng Y, et al. Bio-assembled MgO-coated tea waste biochar efficiently decontaminates phosphate from water and kitchen waste fermentation liquid. Biochar. 2023;5(1):22.
- Guragain YN, De Coninck J, Husson F, Durand A, Rakshit SK. Comparison of some new pretreatment methods for second generation bioethanol production from wheat straw and water hyacinth. Bioresource Technology. 2011;102(6):4416–24.
- Basumatary V, Saikia R, Narzari R, Bordoloi N, Gogoi L, Sut D, et al. Tea factory waste as a feedstock for thermo-chemical conversion to biofuel and biomaterial. Materials Today: Proceedings. 2018;5(11):23413–22.
- Kathir I, Haribabu K, Kumar A, Kaliappan S, Patil PP, Dhanalakshmi CS, et al. Utilization of Tea Industrial Waste for Low‐Grade Energy Recovery: Optimization of Liquid Oil Production and Its Characterization. Advances in Materials Science and Engineering. 2022;2022(1):7852046.
- Rashid U, Ahmad J, Ibrahim ML, Nisar J, Hanif MA, Shean TYC. Single-pot synthesis of biodiesel using efficient sulfonated-derived tea waste-heterogeneous catalyst. Materials. 2019;12(14):2293.
- Mohit SM, Chandrashekhar B, Tanushree C, Kanwal S. Production of bio-ethanol from Jatropha oilseed cakes via dilute acid hydrolysis and fermentation by Saccharomyces cerevisiae. Int J Biotechnol Appl. 2011;3(1):41–7.
- Germec M, Turhan I. Ethanol production from acid-pretreated and detoxified tea processing waste and its modeling. Fuel. 2018;231:101–9.
- Manyuchi M, Mbohwa C, Muzenda E, editors. Biogas and Bio solids production from tea waste through anaerobic digestion. Proceedings of the International Conference on Industrial Engineering and Operations Management; 2018.
- Manyuchi MM, Mbohwa C, Muzenda E, Masebinu S, editors. Techno economic assessment for setting up a viable biogas plant at a local landfill in South Africa. Proceedings of the 2017 International Symposium on Industrial Engineering and Operations Management (IEOM) Bristol, UK; 2017.
- Goel B, Pant D, Kishore V. Two-phase anaerobic digestion of spent tea leaves for biogas and manure generation. Bioresource technology. 2001;80(2):153–6.
- Thanarasu A, Periyasamy K, Devaraj K, Periyaraman P, Palaniyandi S, Subramanian S. Tea powder waste as a potential co-substrate for enhancing the methane production in anaerobic digestion of carbon-rich organic waste. Journal of Cleaner Production. 2018;199:651–8.
- Khayum N, Anbarasu S, Murugan S. Biogas potential from spent tea waste: A laboratory scale investigation of co-digestion with cow manure. Energy. 2018;165:760–8.
- Abe MM, Martins JR, Sanvezzo PB, Macedo JV, Branciforti MC, Halley P, et al. Advantages and disadvantages of bioplastics production from starch and lignocellulosic components. Polymers. 2021;13(15):248
- Jamróz E, Tkaczewska J, Kopeć M, Cholewa-Wójcik A. Shelf-life extension of salmon using active total biodegradable packaging with tea ground waste and furcellaran-CMC double-layered films. Food chemistry. 2022;383:132425.
- Liu M, Arshadi M, Javi F, Lawrence P, Davachi SM, Abbaspourrad A. Green and facile preparation of hydrophobic bioplastics from tea waste. Journal of Cleaner Production. 2020;276:123353.
- Karthäuser J, Biziks V, Mai C, Militz H. Lignin and lignin-derived compounds for wood applications—A review. Molecules. 2021;26(9):2533.
- Xia G, Ji X, Xu Z, Ji X. Transparent cellulose-based bio-hybrid films with enhanced anti-ultraviolet, antioxidant and antibacterial performance. Carbohydrate Polymers. 2022;298:120118.
- Shen Y, Seidi F, Ahmad M, Liu Y, Saeb MR, Akbari A, et al. Recent advances in functional cellulose-based films with antimicrobial and antioxidant properties for food packaging. Journal of Agricultural and Food Chemistry. 2023;71(44):16469–87.
- Shan P, Wang K, Yu F, Yi L, Sun L, Li H. Gelatin/sodium alginate multilayer composite film crosslinked with green tea extract for active food packaging application. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2023;662:131013.
- Quintero-Borregales LM, Vergara-Rubio A, Santos A, Famá L, Goyanes S. Black tea extracts/polyvinyl alcohol active nanofibers electrospun mats with sustained release of polyphenols for food packaging applications. Polymers. 2023;15(5):1311.
- Sethulakshmi A, Saravanakumar M. Sustainable papaya plant waste and green tea residue composite films integrated with starch and gelatin for active food packaging applications. International Journal of Biological Macromolecules. 2024;260:129153.
- Dutta M, Das U, Mondal S, Bhattachriya S, Khatun R, Bagal R. Adsorption of acetaminophen by using tea waste derived activated carbon. International Journal of Environmental Sciences. 2015;6(2):270–81.
- He X, Li J, Meng Q, Guo Z, Zhang H, Liu Y. Enhanced adsorption capacity of sulfadiazine on tea waste biochar from aqueous solutions by the two-step sintering method without corrosive activator. Journal of Environmental Chemical Engineering. 2021;9(1):104898.
- Guardia L, Suarez L, Querejeta N, Rodriguez Madrera R, Suarez B, Centeno Apple waste: a sustainable source of carbon materials and valuable compounds. ACS Sustainable Chemistry & Engineering. 2019;7(20):17335–43.
- Arie AA, Kristianto H, Cengiz EC, Demir-Cakan R. Waste tea-based porous carbon–sulfur composite cathodes for lithium–sulfur battery. Ionics. 2020;26(1):201–12.
- Song X, Ma X, Li Y, Ding L, Jiang R. Tea waste derived microporous active carbon with enhanced double-layer supercapacitor behaviors. Applied Surface Science. 2019;487:189–97.
- Ratnaji T, Kennedy LJ. Hierarchical porous carbon derived from tea waste for energy storage applications: Waste to worth. Diamond and Related Materials. 2020;110:108100.
- Srivastava N, Pal N, Agarwal M, Dohare RK. Investigation of the performance of metal-free catalyst prepared from black tea and green tea waste for hydrogen production via methanolysis of sodium borohydride and optimization using response surface methodology. International Journal of Hydrogen Energy. 2023;48(92):35919–37.
- Jia T, Han F, Zhang R, Zhao M, Chen Z, Wang Z, et al. Biomass photothermal hydrogel based on tea leaves residue for cogeneration of clean water and electricity. Advanced Sustainable Systems. 2024;8(6):2300531.
- Kaya M, Tabak A. Recycling of an agricultural bio-waste as a novel cellulose aerogel: a green chemistry study. Journal of Polymers and the Environment. 2020;28(1):323–30.
- Tin NT, Huyen NTT, Tu PM, Minh PPD, Nam NTH, Cong CQ, et al. Facile fabrication of carbon aerogel by cellulose extracted from tea grounds and carboxymethyl cellulose for adsorption and energy storage applications. Materials Letters. 2023;342:134304.
- Li J, Liu M, Luo W, Xing G, Yang W, Sun H, et al. 3D tea-residue microcrystalline cellulose aerogel with aligned channels for solar-driven interfacial evaporation co-generation. ACS Applied Materials & Interfaces. 2023;15(44):51979–88.
- Nie L, Chang P, Liang S, Hu K, Hua D, Liu S, et al. Polyphenol rich green tea waste hydrogel for removal of copper and chromium ions from aqueous solution. Cleaner Engineering and Technology. 2021;4:100167.
- Nille OS, Patil AS, Vibhute AA, Shendage SS, Tiwari AP, Anbhule PV, et al. Route-dependent tailoring of carbon dot release in alginate hydrogel beads (HB-Alg@ WTR-CDs): A versatile platform for biomedical applications. International Journal of Biological Macromolecules. 2024;257:128126.
- Gao W, Chen F, Wang X, Meng Q. Recent advances in processing food powders by using superfine grinding techniques: A review. Comprehensive Reviews in Food Science and Food Safety. 2020;19(4):2222–55.
- Kaur H, Jaryal N. Utilization of biogenic tea waste silver nanoparticles for the reduction of organic dyes. Materials Research Express. 2018;5(5):055402.
- Wang T, Lin J, Chen Z, Megharaj M, Naidu R. Green synthesized iron nanoparticles by green tea and eucalyptus leaves extracts used for removal of nitrate in aqueous solution. Journal of cleaner production. 2014;83:413–9.
- Shivaji K, Balasubramanian MG, Devadoss A, Asokan V, De Castro CS, Davies ML, et Utilization of waste tea leaves as bio-surfactant in CdS quantum dots synthesis and their cytotoxicity effect in breast cancer cells. Applied Surface Science. 2019;487:159–70.
- Prema P, Veeramanikandan V, Rameshkumar K, Gatasheh MK, Hatamleh AA, Balasubramani R, et al. Statistical optimization of silver nanoparticle synthesis by green tea extract and its efficacy on colorimetric detection of mercury from industrial waste water. Environmental Research. 2022;204:111915.
- Gunjal DB, Naik VM, Waghmare RD, Patil CS, Shejwal RV, Gore AH, et al. Sustainable carbon nanodots synthesised from kitchen derived waste tea residue for highly selective fluorimetric recognition of free chlorine in acidic water: A waste utilization approach. Journal of the Taiwan Institute of Chemical Engineers. 2019;95:147–54.
- Hu C, Lin T-J, Huang Y-C, Chen Y-Y, Wang K-H, Lin K-YA. Photoluminescence quenching of thermally treated waste-derived carbon dots for selective metal ion sensing. Environmental Research. 2021;197:1
- Shaikh WA, Kumar A, Chakraborty S, Islam RU, Bhattacharya T, Biswas JK. Biochar-based nanocomposite from waste tea leaf for toxic dye removal: From facile fabrication to functional fitness. Chemosphere. 2022;291:132788.