Thiolated silica nanoadsorbents enable ultrahigh and fast decontamination of mercury(II): understanding the contribution of thiol moieties' density and accessibility on adsorption performance,Environmental Science: Nano

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Thiolated silica nanoadsorbents enable ultrahigh and fast decontamination of mercury(II): understanding the contribution of thiol moieties' density and accessibility on adsorption performance
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020/01/10 , DOI: 10.1039/c9en01123d
Mohammad Kalantari _{1,

2,

3,

4} , Zhengying Gu _{1,

2,

3,

4} , Yuxue Cao _{1,

2,

3,

4} , Chang Lei _{1,

2,

3,

4} , Jun Zhang _{1,

2,

3,

4}

Affiliation

Effective removal of toxic mercury(II) from aqueous media is a primary challenge for public health and environmental protection. In this work, dendritic mesoporous silica nanoparticles modified with thiol moieties (denoted as TDMSNs) are used as nanoadsorbents to trap mercury(II) ions. It is demonstrated that the exceptionally high density and accessibility of thiol moieties are both necessary to achieve efficient mercury(II) decontamination. TDMSNs with the highest surface thiol group density of 283.2 μmol g⁻¹ exhibit a Hg(II) adsorption capacity of 1502.4 mg g⁻¹, outperforming reported thiolated adsorbents. The large and well-exposed mesopores of TDMSNs enable fast adsorption kinetics within 5 min to reduce the mercury(II) concentration from 10 ppm to below 2 ppb (US Environmental Protection Agency acceptable limit) which is faster than those in previous reports. Furthermore, the TDMSNs show adsorption stability in a wide range of pH and promising reusability performance (89% adsorption capacity maintenance after 5 reuses). Our contribution paves the way for the rational design of nanoadsorbents for efficient environmental pollutant remediation.

中文翻译：

硫代二氧化硅纳米吸附剂可以对汞进行超高和快速的去污（II）：了解硫醇部分的密度和可及性对吸附性能的贡献

从水性介质中有效去除有毒汞（II）是公共卫生和环境保护的主要挑战。在这项工作中，使用巯基部分修饰的树状中孔二氧化硅纳米颗粒（表示为TDMSNs）被用作纳米吸附剂，以捕获汞（II）离子。事实证明，要实现有效的汞（II）去污，硫醇部分的极高密度和可及性都是必需的。具有最高表面TDMSNs的283.2巯基密度微摩尔克^-1表现出汞（II）的吸附容量1502.4毫克克^-1，胜过所报道的硫醇化吸附剂。TDMSN的大且暴露良好的中孔能够在5分钟内实现快速吸附动力学，从而将汞（II）的浓度从10 ppm降至2 ppb（美国环境保护署可接受的限值）以下，这比以前的报告要快。此外，TDMSN在很宽的pH范围内均显示出吸附稳定性，并具有可重复使用的性能（5次重复使用后可保持89％的吸附容量）。我们的贡献为合理设计纳米吸附剂以进行有效的环境污染物修复铺平了道路。

更新日期：2020-03-21

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