Preparation of Molybdenum Disulfide Coated Mg/Al Layered Double Hydroxide Composites for Efficient Removal of Chromium(VI)

作者：Jian Wang, Pengyi Wang, Huihui Wang, Junfei Dong, Wanying Chen, Xiangxue Wang, Suhua Wang, Suhua Wang, Tasawar Hayat, Ahmed Alsaedi, Xiangke Wang, Xiangke Wang · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2017 · DOI：10.1021/acssuschemeng.7b01347 · 被引用次数：192 · 研究领域：Adsorption and biosorption for pollutant removal、Nanomaterials for catalytic reactions、Layered Double Hydroxides Synthesis and Applications

With the rapid development of industry, heavy metal pollution has become a potential hazard to public health and the ecological system. Herein, molybdenum disulfide coated Mg/Al layered double hydroxide composites (LDHs@MoS 2 ) were prepared via a simple hydrothermal method and applied for the adsorption of Cr(VI) from a water solution. The removal capacity of Cr(VI) on LDHs@MoS 2 reached 76.3 mg/g at pH = 5.0, and the removal process relied on ionic strength and pH. The results confirmed that the uptake of Cr(VI) on LDHs@MoS 2 followed a spontaneous endothermic process. In contrast to the LDHs, LDHs@MoS 2 showed excellent chemical stability, which was beneficial for practical applications. Specifically, the coexisting ions had little influence on the uptake of Cr(VI). The interaction of Cr(VI) with the LDHs@MoS 2 composites was mainly controlled by electrostatic attraction and outer-sphere surface complexation. The findings can provide new insights into the uptake of heavy metal ions in a natural aquatic environment pollution cleanup.