Dilrukshi Ekanayaka Achchillage Ayesha, Fujino Takeshi, Motegi Shun
Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan E-mail:
Water Sci Technol. 2018 Jul;77(11-12):2841-2850. doi: 10.2166/wst.2018.277.
In this study, we used aqueous solutions containing 1 mg/L of Cd for electrolysis while varying the current density (CD), amount of bentonite added and the effective submerged area to investigate the adsorption capacity of Cd ions onto bentonite by electrolytic aggregation. The adsorption of Cd ions increased with increasing amount of bentonite added to the electrolytic solution. The addition of bentonite also regulated the pH of the electrolytic solution during the electrolysis process in addition to the hydrolysis of water. The maximum adsorption capacities at equilibrium (q) for current densities of 3.14 and 7.49 mA/cm (i.e. for 2 and 1 L electrolytic solutions) with 0.2 g of bentonite were 4.54 and 2.92 mg/g, respectively. The removal of Cd (R) clearly depended on the pH of the electrolytic solution. Moreover, q decreased with increasing amount of bentonite used for electrolytic aggregation. The findings of this study will be useful for understanding the aggregation of clay particles under electrolysis and their adsorption behaviors.
在本研究中，我们使用含1 mg/L镉的水溶液进行电解，同时改变电流密度（CD）、膨润土添加量和有效浸没面积，以研究通过电解凝聚作用使镉离子在膨润土上的吸附容量。镉离子的吸附量随着添加到电解液中的膨润土量增加而增加。除了水的水解作用外，膨润土的添加还在电解过程中调节了电解液的pH值。对于添加0.2 g膨润土、电流密度分别为3.14和7.49 mA/cm²（即分别对应2 L和1 L电解液）的情况，平衡时的最大吸附容量（q）分别为4.54和2.92 mg/g。镉的去除率（R）明显取决于电解液的pH值。此外，q随着用于电解凝聚的膨润土量增加而降低。本研究结果将有助于理解电解条件下粘土颗粒的凝聚及其吸附行为。
