Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, People's Republic of China.
J Colloid Interface Sci. 2011 Mar 1;355(1):198-203. doi: 10.1016/j.jcis.2010.11.058. Epub 2010 Nov 25.
The use of a chloride-containing synthetic hydrotalcite sol (LDHC) as adsorbent to remove thiocyanate from aqueous solution was investigated. LDHC was prepared by coprecipitation and was characterized by HRTEM, particle size, XRD, and FTIR. The experiments showed that LDHC was particularly effective in removing thiocyanate due to its small particle size and high zeta potential. The adsorption of thiocyanate on LDHC was favored when the initial solution pH was in the range 3-10, though the most effective pH range was between 4.0 and 8.0. The adsorption reached equilibrium within 150 min. The interaction between the surface sites of LDHC and thiocyanate ions may be a combination of both anion exchange and surface complexation. The pseudo-second-order model best described the adsorption kinetics of thiocyanate onto LDHC. The equilibrium isotherm showed that the adsorption of thiocyanate on LDHC was consistent with the Langmuir equation and the saturated adsorption capacity of LDHC for thiocyanate was 98.3 mg/g at 20°C. The regenerated LDHC in FeCl(3) solution can be used repeatedly in adsorption-regeneration cycles. The results showed that LDHC can be used as a new adsorbent for thiocyanate removal from aqueous solution because of its high adsorption capacity and rapid adsorption rate.
采用含氯的合成水滑石溶胶（LDHC）作为吸附剂，从水溶液中去除硫氰酸盐。LDHC 通过共沉淀法制备，并通过 HRTEM、粒度、XRD 和 FTIR 进行了表征。实验表明，LDHC 由于其粒径小和高 ζ 电位，对硫氰酸盐的去除特别有效。当初始溶液 pH 值在 3-10 范围内时，硫氰酸盐在 LDHC 上的吸附是有利的，尽管最有效的 pH 值范围在 4.0-8.0 之间。吸附在 150 分钟内达到平衡。LDHC 表面位点与硫氰酸盐离子之间的相互作用可能是阴离子交换和表面络合的组合。拟二级动力学模型最能描述硫氰酸盐在 LDHC 上的吸附动力学。平衡等温线表明，硫氰酸盐在 LDHC 上的吸附与朗缪尔方程一致，在 20°C 时，LDHC 对硫氰酸盐的饱和吸附容量为 98.3mg/g。在 FeCl3 溶液中再生的 LDHC 可在吸附-再生循环中重复使用。结果表明，LDHC 可以作为一种从水溶液中去除硫氰酸盐的新型吸附剂，因为它具有高吸附容量和快速吸附速率。
