Li Shiyu, Yang Lin, Wu Jialong, Yao Linlin, Han Deming, Liang Yong, Yin Yongguang, Hu Ligang, Shi Jianbo, Jiang Guibin
School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310000, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Water Res. 2023 May 15;235:119896. doi: 10.1016/j.watres.2023.119896. Epub 2023 Mar 20.
Developing practical and cost-effective adsorbents with satisfactory mercury (Hg) remediation capability is indispensable for aquatic environment safety and public health. Herein, a recyclable hierarchical MoS/FeO nanocomposite (by in-situ growth of MoS nanosheets on the surface of FeO nanospheres) is presented for the selective removal of Hg(II) from aquatic samples. It exhibited high adsorption capacity (∼1923.5 mg g ), fast kinetics (k ∼ 0.56 mg g min), broad working pH range (2-11), excellent selectivity (K > 1.0 × 10 mL g ), and great reusability (removal efficiency > 90% after 20 cycles). In particular, removal efficiencies of up to ∼97% for different Hg(II) concentrations (10-1000 μg L ) in natural water and industrial effluents confirmed the practicability of MoS/FeO. The possible mechanism for effective Hg(II) removal was discussed by a series of characterization analyses, which was attributed to the alteration of the MoS structure and the surface coordination of Hg-S. The accessibility of surface sulfur sites and the diffusion of Hg(II) in the solid-liquid system were enhanced due to the advantage of the expanded interlayer spacing (0.96 nm) and the hierarchical structure. This study suggests that MoS/FeO is a promising material for Hg(II) removal in actual scenarios and provides a feasible approach by rationally constructing hierarchical structures to promote the practical applications of MoS in sustainable water treatments.
开发具有令人满意的汞（Hg）修复能力的实用且经济高效的吸附剂对于水生环境安全和公众健康至关重要。在此，提出了一种可回收的分级MoS/FeO纳米复合材料（通过在FeO纳米球表面原位生长MoS纳米片）用于从水生样品中选择性去除Hg(II)。它表现出高吸附容量（约1923.5 mg g ）、快速动力学（k约为0.56 mg g min）、宽工作pH范围（2 - 11）、优异的选择性（K > 1.0×10 mL g ）以及良好的可重复使用性（20次循环后去除效率> 90%）。特别是，在天然水和工业废水中，不同Hg(II)浓度（10 - 1000 μg L ）下高达约97%的去除效率证实了MoS/FeO的实用性。通过一系列表征分析讨论了有效去除Hg(II)的可能机制，这归因于MoS结构的改变和Hg - S的表面配位。由于层间距扩大（0.96 nm）和分级结构的优势，表面硫位点的可及性以及Hg(II)在固液系统中的扩散得到增强。本研究表明MoS/FeO是实际场景中去除Hg(II)的有前途的材料，并通过合理构建分级结构提供了一种可行的方法来促进MoS在可持续水处理中的实际应用。
