Enhanced sorption of perfluorooctane sulfonate and Cr(VI) on organo montmorillonite: influence of solution pH and uptake mechanism
Enhanced sorption of perfluorooctane sulfonate and Cr(VI) on organo montmorillonite: influence of solution pH and uptake mechanism
复制标题
DOI：
10.1007/s10450-013-9496-5
复制
发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
Qin Zhou;G. Pan;W. Shen
中科院分区：
文献类型：
--
作者：
Qin Zhou;G. Pan;W. Shen
制备了一种同时去除模拟电镀废水中全氟辛烷磺酸（PFOS）和六价铬（Cr（VI））的吸附剂。Cr的去除是pH依赖性的。然而，全氟辛烷磺酸在有机蒙脱石（Mts）上的去除对pH值变化不敏感。胶束和半胶束的存在增强了全氟辛烷磺酸在十六烷基三甲基溴化铵改性蒙脱石上的吸附能力，达到1，000毫克/克。有机分子筛上的阳离子表面活性剂对疏水分配起主要作用。AET-Mt和AET-HDTMAB-Mt（AET，2-氨基乙基乙二胺盐酸盐）对Cr（VI）的吸附主要是由于HCrO 4-与氨基、巯基形成稳定的配位化合物。结果表明，AET-HDTMAB-Mt对PFOS和Cr（VI）的吸附容量分别达到890和14 mg/g。
An effective sorbent to remove the perfluorooctane sulfonate (PFOS) and hexavalent chromium (Cr(VI)) simultaneously from simulating plating wastewater was prepared in this study. The removal of Cr was pH-dependent. However, PFOS removal on organo-montmorillonites (Mts) was not sensitive to pH changes. The presence of micelles and hemi-micelles resulted in an enhanced PFOS sorption capacity which reached 1,000 mg/g on the hexadecyltrimethylammonium bromide (HDTMAB) modified montmorillonite. The cationic surfactants on organo-Mts were largely responsible to the hydrophobic partition. For Cr(VI), the stable coordination compounds between amido, sulfhydryl groups and HCrO4− were beneficial to its sorption on AET–Mt and AET–HDTMAB–Mt (AET, 2-aminoethanethiol hydrochloride). The result indicated that the AET–HDTMAB–Mt was highly effective for removing both PFOS and Cr(VI) simultaneously, and their sorption capacities reached 890 and 14 mg/g respectively.