Chai Liyuan, Chen Yunnen, Yang Zhihui
School of Metallurgical Science & Engineering, Central South University, Changsha, China.
Water Environ Res. 2009 Sep-Oct;81(9):843-8. doi: 10.2175/106143009x407410.
Using chemically modified spent grains as a new biosorbent to treat arsenate and arsenite ions was studied. The influences of pH, contact time, initial concentration and temperature were studied in batch experiments. The equilibrium process was described well by Langmuir isotherm model with maximum biosorption capacities of 13.39 and 4.86 mg/g of arsenate and arsenite on spent grains, respectively. The initial removal was rapid, and equilibrium was established in less than 180 min. Good correlation coefficients were obtained for the pseudo-second-order kinetic model. In the binary metal solutions, the finite sites on the surface of spent grains showed a greater preference for As(V) ions. The enthalpy of biosorption was exothermic and the increase in As(III) removal was larger than that of As(V) over the same rise in temperature. In this study, spent grains proved to be suitable for removal of As(V) and As(III) from the effluent of metallurgical industry.
研究了使用化学改性的废弃谷物作为新型生物吸附剂来处理砷酸盐和亚砷酸盐离子。在分批实验中研究了pH值、接触时间、初始浓度和温度的影响。Langmuir等温线模型能很好地描述平衡过程，废弃谷物对砷酸盐和亚砷酸盐的最大生物吸附容量分别为13.39和4.86 mg/g。初始去除速度很快，在不到180分钟内达到平衡。准二级动力学模型获得了良好的相关系数。在二元金属溶液中，废弃谷物表面的有限位点对As(V)离子表现出更大的偏好。生物吸附的焓是放热的，在相同温度升高下，As(III)去除率的增加大于As(V)。在本研究中，废弃谷物被证明适用于从冶金工业废水中去除As(V)和As(III)。
