College of Land and Environment, Shenyang Agricultural University, Shenyang110161, China.
Int J Environ Res Public Health. 2022 Dec 15;19(24):16848. doi: 10.3390/ijerph192416848.
In order to explore the optimal conditions for the adsorption of Cd in serpentine, this paper studied the adsorption of simulated cadmium solutions with serpentine as an adsorbent. On the basis of a single factor experiment, four factors including the amount of serpentine, initial pH, the initial concentration of solutions, and adsorption time were selected as the influencing factors, and the adsorption quantity and adsorption rate of serpentine to Cd were double response values using the Box-Behnken design. Response surface analyses were used to study the effects of four factors on the adsorption quantity and adsorption rate of serpentine on cadmium, and the interaction between various factors. The results showed that the optimum adsorption conditions were as follows: the amount of serpentine was 1%, the initial pH was 5.5, the initial solution concentration was 40.83 mg·L, and the adsorption time was 26.78 h. Under these conditions, the theoretical adsorption quantity and adsorption rate of serpentine to Cd were 3.99 mg·g and 95.24%, respectively. At the same time, after three repeated experiments, the actual adsorption quantity and adsorption rate of serpentine to Cd were 3.91 mg·g and 94.68%, respectively, and the theoretical value was similar to the actual value. Therefore, it was proved that the experimental design of the regression model is reliable, and it is feasible to use the response surface method to optimize the adsorption conditions of serpentine on Cd.
为了探究蛇纹石吸附 Cd 的最佳条件，本文以蛇纹石为吸附剂，研究了模拟 Cd 溶液的吸附作用。在单因素实验的基础上，选取蛇纹石用量、初始 pH 值、溶液初始浓度和吸附时间 4 个因素作为影响因素，采用 Box-Behnken 设计，以蛇纹石对 Cd 的吸附量和吸附率为双响应值，对蛇纹石吸附 Cd 的影响因素及各因素间的交互作用进行研究。结果表明，最佳吸附条件为：蛇纹石用量 1%、初始 pH 值 5.5、初始溶液浓度 40.83mg·L-1、吸附时间 26.78h。在此条件下，蛇纹石对 Cd 的理论吸附量和吸附率分别为 3.99mg·g-1和 95.24%。同时，经过 3 次重复实验，蛇纹石对 Cd 的实际吸附量和吸附率分别为 3.91mg·g-1和 94.68%，理论值与实际值较为接近。因此，证明了回归模型实验设计的可靠性，采用响应面法优化蛇纹石对 Cd 的吸附条件是可行的。
