School of Material Sciences and Technology, China University of Geosciences, Beijing, 100083, China.
Water Environ Res. 2012 Aug;84(8):682-8. doi: 10.2175/106143012x13373550426751.
Contaminants in water are classified into different types based on their physical and chemical properties. Thus, more than one type of sorbents may be needed for their removal. In this article, a combination of vermiculite with palygorskite was studied for their simultaneous removal of ammonium and humic acid from simulated groundwater. Batch results showed that the Langmuir model described ammonium adsorption well with an adsorption capacity of 22 mg/g while the humic acid adsorption data fitted to the linear adsorption better, suggesting different removal mechanisms of these two types of contaminants. Kinetic studies showed an instantaneous removal of ammonium and humic acid. A column packed with mixture of equal volumes of vermiculite and palygorskite could treat 100 pore volumes for ammonium removal at an initial concentration of 10 mg/L and 500 pore volumes for humic acid removal at an initial concentration of 20 mg/L before the effluent concentrations exceeded the standard.
水中的污染物根据其物理和化学性质分为不同类型。因此，可能需要不止一种类型的吸附剂来去除它们。本文研究了蛭石与坡缕石的组合，以同时去除模拟地下水中的铵和腐殖酸。批量结果表明，Langmuir 模型很好地描述了铵的吸附，吸附容量为 22mg/g，而腐殖酸的吸附数据更符合线性吸附，表明这两种类型的污染物的去除机制不同。动力学研究表明，铵和腐殖酸可瞬时去除。用等体积的蛭石和坡缕石混合物填充的柱子，在初始浓度为 10mg/L 的情况下，可处理 100 个孔隙体积的铵去除，在初始浓度为 20mg/L 的情况下，可处理 500 个孔隙体积的腐殖酸去除，然后流出物浓度超过标准。
