Outstanding Performance of Recyclable Amorphous MoS3 Supported on TiO2 for Capturing High Concentrations of Gaseous Elemental Mercury: Mechanism, Kinetics, and Application

被引：108

作者：

Mei, Jian ^{[1
]}

Wang, Chang ^{[1
]}

Kong, Lingnan ^{[1
]}

Liu, Xiaoli ^{[1
]}

Hu, Qixing ^{[1
]}

Zhao, Hui ^{[1
]}

Yang, Shijian ^{[1
]}

机构：

[1] Jiangnan Univ, Sch Environm & Civil Engn, Jiangsu Key Lab Anaerob Biotechnol, Wuxi 214122, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2019年 / 53卷 / 08期

关键词：

SELECTIVE CATALYTIC-REDUCTION; BASIC REACTION STEPS; X-RAY PHOTOELECTRON; ACTIVE EDGE SITES; MAGNETIC SORBENT; COAL COMBUSTION; FLUE-GAS; EMISSIONS; REMOVAL; OXIDATION;

D O I：

10.1021/acs.est.9b00464

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Hg-0 capture by sorbents was a promising technology to control Hg-0 emission from coal-fired power plants and smelters. However, the design of a high performance sorbent and the predicting of the extent of Hg-0 adsorption were both extremely limited due to the lack of adsorption kinetics and structure-activity relationship. In this work, the adsorption kinetics of gaseous Hg-0 onto MoS3/TiO2 was investigated and kinetic parameters were obtained by fitting breakthrough curves. According to the kinetic parameters, the removal efficiency, the adsorption rate and the capacity for Hg-0 capture were accurately predicted. Meanwhile, the structure-activity relationship of metal sulfides for gaseous Hg-0 adsorption was built. The chemical adsorption rate of gaseous Hg-0 was found to mainly depend on the amount of surface adsorption sites available for the physical adsorption of Hg-0, the amount of surface S-2(2-) available for Hg-0 oxidation and gaseous Hg-0 concentration. As MoS3/TiO2 showed a superior performance for capturing high concentrations of Hg-0 due to the large number of surface adsorption sites for the physical adsorption of gaseous Hg-0, it has promising applications in recovering Hg-0 from smelting flue gas.

引用

页码：4480 / 4489

页数：10

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