Nassir Taha Dakhil, Sadi Samaka Isra'a
Department of Chemistry College of Science University of Babylon-Iraq, Babylon, Iraq.
J Oleo Sci. 2012;61(12):729-36. doi: 10.5650/jos.61.729.
In this study, natural Iraqi low- cost locally available clay (palygorskite) was studied for its potential use as an adsorbent for removal Congo red from aqueous solutions. Batch type experiments were conducted to study the effect of contact time, initial pH of the dye solution, initial dye concentration, adsorbent dosage, and particle size of adsorbent on adsorption capacity of Congo red. The adsorption occurred very fast initially and attains equilibrium within 60 min. When the effect of pH of solution dye on the yield adsorption has been carried in a range of 2-10, the adsorption obtained was nearly the same with very slightly effect of pH and it was reported that above 49.07 mg/g of Cong red by palygorskite clay occurred in the pH range 2 to 10. It was observed that the removal of Congo red increase with increasing initial dye concentration and adsorbent dose, but, adsorption capacity decrease with increasing adsorbent dose. The adsorption capacity increase with decreasing particle size of adsorbent. The equilibrium adsorption data were interpreted using Langmuir and Freundlich isotherm models. The obtained results revealed that the equilibrium data closely followed both models, but the Langmuir isotherm fitted the data better. The maximum adsorption capacity was found to be 99 mg/g at ambient temperature. Results indicate that Iraqi palygorskite clay could be employed as a low cost alternative to commercial activated carbon in wastewater treatment for the removal of colour and dyes.
在本研究中，对伊拉克当地可获得的天然低成本粘土（坡缕石）作为从水溶液中去除刚果红的吸附剂的潜在用途进行了研究。进行了批次类型实验，以研究接触时间、染料溶液的初始pH值、初始染料浓度、吸附剂用量以及吸附剂粒径对刚果红吸附容量的影响。吸附最初进行得非常快，并在60分钟内达到平衡。当在2 - 10的范围内研究溶液染料的pH值对吸附产率的影响时，得到的吸附量几乎相同，pH值的影响非常小，据报道，在2至10的pH范围内，坡缕石粘土对刚果红的吸附量超过49.07 mg/g。观察到刚果红的去除率随着初始染料浓度和吸附剂剂量的增加而增加，但吸附容量随着吸附剂剂量的增加而降低。吸附容量随着吸附剂粒径的减小而增加。使用朗缪尔和弗伦德里希等温线模型对平衡吸附数据进行了解释。所得结果表明，平衡数据与两个模型都密切相关，但朗缪尔等温线对数据的拟合更好。在环境温度下，最大吸附容量为99 mg/g。结果表明，伊拉克坡缕石粘土可作为商业活性炭的低成本替代品，用于废水处理中去除颜色和染料。
