The University of Queensland, School of Chemical Engineering, St Lucia, 4072, QLD, Australia.
Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, PR China.
Chemosphere. 2019 Oct;232:9-17. doi: 10.1016/j.chemosphere.2019.05.182. Epub 2019 May 24.
Amorphous molybdenum sulphide materials are attracting more attention in heterogeneous catalysis, gas adsorption and water remediation fields. Herein, a new type of amorphous molybdenum sulphide composite (poly(diallyldimethylammonium-MoS), shorten as PDADMA-MoS) was synthesized via a facile precipitation reaction. Metal adsorption tests of prepared PDADMA-MoS composite shows that Hg and Pb concentrations in solution can decrease from 10 ppm to <0.5 ppb level much lower than the drinking water requirement (<2 ppb) in 10 min. The metal adsorption isotherms suggest that maximum metal-uptake capacities are 1460.0 mg/g for Hg (pH = 5) and 433.7 mg/g for Hg (pH = 1), indicating that this sorbent works over a wide pH range (1.0-7.0) to effectively remove Hg from aqueous solution. More importantly, at very low pH = 1, this sorbent material exhibits extraordinarily high selectivity of Hg over Pb and Cu (separation factors β=4.5×10 and β=3.6×10). The excellent Hg capacity and selectivity at low pH region (pH < 2) has shed light on the new generation of adsorbent materials for acidic wastewater treatment.
无定形硫化钼材料在多相催化、气体吸附和水修复领域引起了越来越多的关注。在此，通过简便的沉淀反应合成了一种新型的无定形硫化钼复合材料（聚二烯丙基二甲基铵-硫化钼，简称 PDADMA-MoS）。制备的 PDADMA-MoS 复合材料的金属吸附测试表明，溶液中的 Hg 和 Pb 浓度可以在 10 分钟内从 10ppm 降低到<0.5ppb 以下，远低于饮用水要求（<2ppb）。金属吸附等温线表明，Hg 的最大金属吸附容量为 1460.0mg/g（pH=5）和 433.7mg/g（pH=1），表明该吸附剂在较宽的 pH 范围内（1.0-7.0）工作，可有效去除水溶液中的 Hg。更重要的是，在非常低的 pH=1 时，这种吸附剂材料对 Hg 相对于 Pb 和 Cu 表现出极高的选择性（分离因子β=4.5×10 和β=3.6×10）。在低 pH 区域（pH<2）具有优异的 Hg 容量和选择性，为酸性废水处理的新一代吸附剂材料提供了思路。
