Aşçi Y, Nurbaş M, Açikel Y Sağ
Department of Chemical Engineering, Eskişehir Osmangazi University, 26480 Bati Meşelik, Eskişehir.
J Hazard Mater. 2007 Jan 2;139(1):50-6. doi: 10.1016/j.jhazmat.2006.06.004. Epub 2006 Jun 10.
In this study, a microbial surfactant, rhamnolipid, was investigated for its potential to enhance recovery of Cd(II) from kaolin, a representative soil component. The study was divided into two parts. In the first part, the sorption of Cd(II) ions to kaolin was investigated as a function of pH and initial Cd(II) ion concentration. Kaolin was also shown to be a good sorbent for treatment of Cd(II) ions from waste waters. The equilibrium sorption capacity for Cd(II) ions was measured and extrapolated using the Langmuir, Freundlich, Redlich-Peterson, and Koble-Corrigan sorption models. The best correlation between experimental and model predicted equilibrium uptake was obtained using the Kolbe-Corrigan sorption model. The values of parameters of the Koble-Corrigan model were determined as A=11.13 (mmol(1-b)kg(-1)L(b)); B=0.39 (L(b)mmol(-b)); b=0.48. In the second part, the desorption of Cd(II) from kaolin was investigated as a function of pH, rhamnolipid concentration, and the amount of sorbed Cd(II) by kaolin. The highest Cd(II) desorption efficiency by rhamnolipid biosurfactant from kaolin was obtained at pH 6.8, at an initial Cd(II) ion concentration of 0.87 mM (4.42 mmol Cd(II)/kg kaolin) and at a rhamnolipid concentration of 80 mM and found to be 71.9% of the sorbed Cd(II).
在本研究中，对一种微生物表面活性剂鼠李糖脂进行了研究，考察其从高岭土（一种典型的土壤成分）中提高镉（II）回收率的潜力。该研究分为两部分。第一部分，研究了镉（II）离子在高岭土上的吸附随pH值和初始镉（II）离子浓度的变化情况。高岭土也被证明是处理废水中镉（II）离子的良好吸附剂。使用朗缪尔、弗伦德利希、雷德利希 - 彼得森和科布尔 - 科里根吸附模型测量并外推了镉（II）离子的平衡吸附容量。使用科布尔 - 科里根吸附模型获得了实验值与模型预测的平衡吸附量之间的最佳相关性。科布尔 - 科里根模型的参数值确定为A = 11.13（mmol(1 - b)kg(-1)L(b)）；B = 0.39（L(b)mmol(-b)）；b = 0.48。第二部分，研究了镉（II）从高岭土上的解吸随pH值、鼠李糖脂浓度以及高岭土吸附的镉（II）量的变化情况。在pH 6.8、初始镉（II）离子浓度为0.87 mM（4.42 mmol Cd(II)/kg高岭土）和鼠李糖脂浓度为80 mM时，鼠李糖脂生物表面活性剂从高岭土上解吸出的镉（II）效率最高，发现其为吸附的镉（II）的71.9%。
