Mo 3 S 13 2− Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag + Ions to Metallic Ag 0 Ribbons
Mo 3 S 13 2− Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag + Ions to Metallic Ag 0 Ribbons
复制标题
Mo 3 S 13 2â 插层层状双氢氧化物：高选择性去除重金属并同时将 Ag 离子还原为金属 Ag 0 带
DOI：
10.1002/anie.202112511
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Shi, Keren
中科院分区：
文献类型：
--
作者：
Yang, Lixiao;Xie, Linxia;Chu, Menglin;Wang, Hui;Yuan, Mengwei;Yu, Zihuan;Wang, Chaonan;Yao, Huiqin;Islam, Saiful M.;Shi, Keren
我们通过将Mo 3S 132-插入Mg/Al层状双氢氧化物（缩写为Mo 3S 132-）中来展示一种新材料。Mo 3S 13-LDH），对有毒的Hg 2+和贵金属银（Ag）表现出优异的捕获能力。在不同竞争离子存在下，Mo 3S 13-LDH对Ag+、Hg 2+和Cu 2+表现出超高的选择性，其顺序为Ag+> Hg 2 +> Cu 2 +> Pb 2 +≥Co2+、Ni 2+、Zn 2+、Cd 2+。对于Ag+和Hg 2+，观察到极快的吸附速率（10 min内> 90%，1 h内> 99%）。 对Ag+和Cu 2+，特别是痕量Ag+（~ 1 ppm），存在高得多的选择性，在520的大Cu/Ag比下实现了~ 8000的大分离因子（SFAg/Cu）。 对Ag+（qmAg=1073 mg g−1）和Hg 2+（qmHg=594 mg g−1）的压倒性吸附能力使Mo 3S 13-LDH成为性能最好的吸附剂材料。 最重要的是，Mo 3S 13-LDH通过两种途径捕获Ag+：a）由于Ag-S络合和沉淀形成Ag 2S，和B）将Ag+还原为金属银（Ag 0）。Mo 3S 13-LDH是一种很有前途的材料，可用于从富铜矿物中提取低品位银，并从污染的水中捕集剧毒的Hg 2+。
We demonstrate a new material by intercalating Mo3S132−into Mg/Al layered double hydroxide (abbr. Mo3S13‐LDH), exhibiting excellent capture capability for toxic Hg2+and noble metal silver (Ag). The as‐prepared Mo3S13‐LDH displays ultra‐high selectivity of Ag+, Hg2+and Cu2+in the presence of various competitive ions, with the order of Ag+>Hg2+>Cu2+>Pb2+≥Co2+, Ni2+, Zn2+, Cd2+. For Ag+and Hg2+, extremely fast adsorption rates (≈90 % within 10 min, >99 % in 1 h) are observed. Much high selectivity is present for Ag+and Cu2+, especially for trace amounts of Ag+(≈1 ppm), achieving a large separation factor (SFAg/Cu) of ≈8000 at the large Cu/Ag ratio of 520. The overwhelming adsorption capacities for Ag+(qmAg=1073 mg g−1) and Hg2+(qmHg=594 mg g−1) place the Mo3S13‐LDH at the top of performing sorbent materials. Most importantly, Mo3S13‐LDH captures Ag+via two paths: a) formation of Ag2S due to Ag‐S complexation and precipitation, and b) reduction of Ag+to metallic silver (Ag0). The Mo3S13‐LDH is a promising material to extract low‐grade silver from copper‐rich minerals and trap highly toxic Hg2+from polluted water.