تعهد نامه

نوع مقاله : مقالات پژوهشی

نویسندگان

1 گروه شیمی، واحد علوم و تحقیقات خوزستان، دانشگاه آزاد اسلامی، اهواز، ایران

2 گروه شیمی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

چکیده                          
زمینه و هدف: مشکلات محیط زیستی ناشی از ورود آنتی‌بیوتیک­ها به منابع آبی، به علت سمی بودن و اثرات پایدار آنها، تهدیدی جدی به شمار می­رود. مطالعه حاضر با هدف بررسی کارایی کربن فعال گرانولی به عنوان جاذب در حذف سفالکسین از محلول­های آبی صورت گرفت.
مواد و روش‌ها: آزمایشات در مقیاس آزمایشگاهی و به صورت ناپیوسته انجام گرفت. تأثیر متغیرهای مؤثر در فرآیند حذف سفالکسین، از جمله pH، مقدار جاذب، غلظت اولیه سفالکسین و زمان تماس بررسی شد. برای ارزیابی داده­های جذب، ایزوترم­های لانگمویر، فروندلیچ و تمکین، همچنین سینتیک جذب با مدل­های شبه مرتبه اول و شبه مرتبه دوم، مطالعه شدند.
یافته‌ها: نتایج نشان داد افزایش pH محلول اولیه از 2 به 14، کارایی جذب سفالکسین را کاهش می­دهد؛ به‌طوری‌که در غلظت اولیه 20 میلی‌گرم بر لیتر و 2/0 گرم از جاذب، بعد از 3 ساعت، کارایی جذب برای pH­های 2، 5/3 و 14 به ترتیب 92/812%، 90/525% و 41/394% به‌دست آمد. جذب سفالکسین با مدل ایزوترم لانگمویر و سینتیک شبه مرتبه دوم مطابقت داشت.
نتیجه‌گیری: کربن فعال گرانولی علاوه بر داشتن ویژگی­هایی چون جداسازی سریع و آسان، پتانسیل بالایی برای جذب و جداسازی سفالکسین و چنین آلاینده­هایی از محیط­های آبی دارد.
نوع مقاله: مقاله پژوهشی
کلید واژه‌ها: جذب سطحی، سفالکسین، کربن فعال گرانولی، محلول‌های آبی، مطالعه سینتیکی

کلیدواژه‌ها

عنوان مقاله [English]

Removal of Cephalexin from Aqueous Solutions by Activated Carbon Adsorbent

نویسندگان [English]

  • Maryam Hemmati 1
  • Arezoo Ghaemi 2
  • Haman Tavakkoli 2

1 Department of Chemistry, Khouzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran

2 Department of Chemistry, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

چکیده [English]

Introduction: Environmental problems caused by arrival of antibiotics in water resources due to toxicity and lasting effects are a serious threat. This study has been aimed to evaluate the efficiency of granular activated carbon as adsorbent for the removal of Cephalexin from aqueous solutions.
Materials and Methods: This study was performed at laboratory scale and batch system. The influence of process variables such as pH of solution, adsorbent dosage, initial Cephalexin concentration and contact time were Investigated. Equilibrium study data were modeled using Langmuir, Freundlich and Temkin, moreover, kinetic studies were done by models of pseudo first order and pseudo second order.
Findings: This research found that the Cephalexin adsorption efficiency decreased by increasing pH from 2 to 14, so that after 3 hours, the adsorption efficiency at the 20 mg.L-1 initial Cephalexin concentration and 0.2 g adsorbent, obtained 92.812%, 90.525% and 41.394% at pH 2, 3.5 and 14, respectively. The adsorption of Cephalexin was compatible with Langmuir isotherm and pseudo second order kinetic.
Discussion and Conclusions: The present study showed that the granular activated carbon has high potential for adsorption and separation of Cephalexin and such pollutants from aqueous solutions, in addition to features like simple and rapid separation.

کلیدواژه‌ها [English]

  • Adsorption
  • Cephalexin
  • Granular activated carbon
  • Kinetic study
  • Aqueous solutions
References
1.             Lieberman JM. Appropriate antibiotic use and why it is important: the challenges of bacterial resistance. The Pediatric Infect. Disease J 2003; 22(12): 1143-51.
2.             Vieno NM, Tuhkanen T, Kronberg L. Analysis of neutral and basic pharmaceuticals in sewage treatment plants and in recipient rivers using solid phase extraction and liquid chromatography–tandem mass spectrometry detection. J Chromatography A 2006; 1134(1): 101-11.
3.             Kulik N, Trapido M, Goi A, et al. Combined chemical treatment of pharmaceutical effluents from medical ointment production. Chemos 2008; 70(8): 1525-31.
4.             Michael I, Rizzo L, McArdell C, et al. Urban wastewater treatment plants as hotspots for the release of antibiotics in the environment: a review. Water Res 2013; 47(3): 957-95.
5.             Watkinson A, Murby E, Costanzo S. Removal of antibiotics in conventional and advanced wastewater treatment: implications for environmental discharge and wastewater recycling. Water Res 2007; 41(18): 4164-76.
6.             Mohammadi AS, Sardar M. The removal of penicillin G from aqueous solutions using chestnut shell modified with H2SO4: Isotherm and kinetic study. Iran J Health and Environ 2013; 5(4): 497-508.
7.             Elmolla ES, Chaudhuri M. Combined photo-Fenton–SBR process for antibiotic wastewater treatment. J Hazard Mater 2011; 192(3): 1418-26.
8.             Nazari G, Abolghasemi H, Esmaieli M. Batch adsorption of cephalexin antibiotic from aqueous solution by walnut shell-based activated carbon. J Taiwan Inst Chem Eng 2016; 58: 357-65.
9.             Rodayan A, Segura PA, Yargeau V. Ozonation of wastewater: removal and transformation products of drugs of abuse. Sci Total Environ 2014; 487: 763-70.
10.          Ziylan A, Ince NH. The occurrence and fate of anti-inflammatory and analgesic pharmaceuticals in sewage and fresh water: treatability by conventional and non-conventional processes. J Hazard Mater 2011; 187(1): 24-36.
11.          Gabet-Giraud V, Miège C, Choubert J, et al. Occurrence and removal of estrogens and beta blockers by various processes in wastewater treatment plants. Sci Total Environ 2010; 408(19): 4257-69.
12.          Iram M, Guo C, Guan Y, et al. Adsorption and magnetic removal of neutral red dye from aqueous solution using Fe3O4 hollow nanospheres. J Hazard Mater 2010; 181(1): 1039-50.
13.          Qu S, Huang F, Yu S, et al. Magnetic removal of dyes from aqueous solution using multi-walled carbon nanotubes filled with Fe2O3 particles. J Hazard Mater 2008; 160(2): 643-47.
14.          Liu H, Liu W, Zhang J, et al. Removal of cephalexin from aqueous solutions by original and Cu (II)/Fe (III) impregnated activated carbons developed from lotus stalks Kinetics and equilibrium studies. J Hazard Mater 2011; 185(2): 1528-35.
15.          Ahmed MJ, Theydan SK. Adsorption of cephalexin onto activated carbons from Albizia lebbeck seed pods by microwave-induced KOH and K2CO3 activations. Chem Eng J 2012; 211: 200-07.
16.          Pouretedal H, Sadegh N. Effective removal of amoxicillin, cephalexin, tetracycline and penicillin G from aqueous solutions using activated carbon nanoparticles prepared from vine wood. J Water Pro Eng 2014; 1:64-73.
17.          Su J, Lin H-f, Wang Q-P, et al. Adsorption of phenol from aqueous solutions by organomontmorillonite. Desalination 2011; 269(1): 163-69.
18.          Langmuir I. The Constitution and Fundamental Properties of Solid and Liquid. Part I. Solids. J Am Chem Soc. 1916; 38(11): 2221-95.
19.          Aksu Z, Tunç Ö. Application of biosorption for penicillin G removal: comparison with activated carbon. Pro. Biochem 2005; 40(2): 831-47.
20. Gashtasbi F, Yengejeh RJ, Babaei AA. Photocatalysis assisted by activated-carbon-impregnated magnetite composite for removal of cephalexin from aqueous solution.
Korean J Chem Eng 2018; 35: 1726–34.
21. Gashtasbi F, Yengejeh RJ, Babaei AA. Adsorption of vancomycin antibiotic from aqueous solution using an activated carbon impregnated magnetite composite. Desalin Water Treat 2017; 88: 286-97.