Mohammad Hadi Abolhasani; Niloofar Pirestani; Ali Eslami
Abstract
Abstract Background and Aim: Increasing levels of toxic heavy metals in the environment have led to risks to the health of humans and living organisms. Materials and methods: First, some characteristics of rock wool including pH, EC, pHZPC, chemical composition, structure, and morphology were determined ...
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Abstract Background and Aim: Increasing levels of toxic heavy metals in the environment have led to risks to the health of humans and living organisms. Materials and methods: First, some characteristics of rock wool including pH, EC, pHZPC, chemical composition, structure, and morphology were determined using XRD, XRF, and Scanning Electron Microscopy (SEM). Adsorbing tests were then conducted in a non-continuous reactor using synthetic solutions containing nickel. Optimum adsorption conditions were determined concerning pH, metal initial concentration, contact time, and adsorbent dose. The data were analyzed in a completely randomized block design. Results: The highest adsorption was seen at pH = 5 and the lowest at pH = 3, with a significant difference. The absorption rate was significantly higher in the 5 mg/l solutions than in other concentrations and the lowest was observed at 100 mg/l concentration. The lowest nickel adsorption rate was observed in 5 min and the highest adsorption efficiency was observed in 90 min, with a significant difference. The adsorption percentage of rock wool waste at the 10 g/l doses was significantly higher than that in other adsorbent doses and the lowest adsorption percentage was observed at the 1 g/l dose. The isotherm studies showed that the adsorption of nickel by rock wool waste was consistent with the Freundlich model. Conclusion: It can be concluded that rock wool waste could remove nickel from industrial effluents.
Mojtaba Afsharnia; Aliakbar Dehghan; Hosein Alidadi; Najmeh Afsharkohan; Sedigheh Majidian
Abstract
Abstract Background & Aim: The colored waste from the textile industry is one of the most pollutants in the aquatic environment. One of the most widely used paints in the textile industry is methylene blue, which is often aromatic, often toxic, carcinogenic, mutated and resistant to biological ...
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Abstract Background & Aim: The colored waste from the textile industry is one of the most pollutants in the aquatic environment. One of the most widely used paints in the textile industry is methylene blue, which is often aromatic, often toxic, carcinogenic, mutated and resistant to biological degradation and has harmful effects on living organisms. The purpose of this study was to investigate the bismuth oxyiodide nanoparticles capability to absorb methylene blue from synthetic wastewater. Materials &methods: The present study was carried out in a laboratory scale in batch mode. The effects of variables affecting the process including pH, adsorbent dose, contact time and initial concentration of color, kinetic and adsorption isotherm were investigated. Results: The maximum removal efficiency of methylene blue from solutions was observed in optimal conditions as pH of 9, contact time of 30 minutes, absorbance dose of 3 g/L and initial concentration of 10 mg/L. Methylene blue adsorption compliance by BiOI from a pseudo-second kinetic model and Langmuir isotherm model shows that the type of reaction is chemical absorption. Conclusion: The results of the experiments showed that bismuth oxide has a high potential for removal of methylene blue molecules from contaminated wastewater.
Fahimeh Sharifan; Ali Shahidi; Abbas Khashei
Abstract
Background& objective: The hexavalent chromium is a toxic and water-soluble heavy metal that is absorbed and stored through the digestive system and through the skin in the human body. That amount is exceeded in drinking water in Birjand. So the purpose of this studies, Process about remove the hexavalent ...
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Background& objective: The hexavalent chromium is a toxic and water-soluble heavy metal that is absorbed and stored through the digestive system and through the skin in the human body. That amount is exceeded in drinking water in Birjand. So the purpose of this studies, Process about remove the hexavalent chromium by using from pine fruit powder, carbon and compare to each other. Methods: In this research, for Calculate removal efficiency (Re), Parameters of contact time, pH, adsorbent dose, initial Cr (VI) concentration and Temperature was studied. Experiments were intermittently performed in batch reactor on Shaker. Results: The results showed that the absorption of chromium significantly depends on the pH of the solution and the absorption rate in the range of 3 for powder and 1 for carbon was achieved when the pH of the solution. The maximum removal of Cr (VI) for pine fruit powder is 96/5 % and for activated Carbon Pine Cones is 93/958%. The results indicate that the soluble chromium ions through the absorbent used in this study, as well as follow the Langmuir isotherm model. Conclusion: The most remove of the hexavalent chromium happened by pine fruit powder and Pine cones can be used as an effective and inexpensive method to remove of the hexavalent chromium from contaminated wastewater.