Favorably adjusting the pore characteristics of copper sulfide by template regulation for vapor-phase elemental mercury immobilization

Zheng, Wei; Yang, Zhaoguang; Yang, Jianping; Qu, Wenqi; Feng, Yong; Jiang, Shao-Jian; Zhao, Shilin; Shih, Kaimin; Li, Hailong

doi:10.1039/d2ta00022a

Cited by 20 publications

(13 citation statements)

References 42 publications

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“…On the contrary, pyrrhotite with abundant S – sites had a larger Hg 0 adsorption capacity, which indicated that S – sites exhibited a higher reactivity than S 2– sites for Hg 0 capture . Furthermore, with the assistance of S n 2– sites, the Hg 0 adsorption capacity and uptake rate of CuS could reach 208.5 mg g –1 and 97.3 μg g –1 min –1 , respectively . According to the summarized data in Table , it can be concluded that the Hg 0 adsorption activities of S 2 2– and S n 2– were generally higher than those of S 2– sites.…”

Section: Raw Metal Sulfidesmentioning

confidence: 95%

“…60 Furthermore, with the assistance of S n 2− sites, the Hg 0 adsorption capacity and uptake rate of CuS could reach 208.5 mg g −1 and 97.3 μg g −1 min −1 , respectively. 62 According to the summarized data in Table 2, it can be concluded that the Hg 0 adsorption activities of S 2 2− and S n 2− were generally higher than those of S 2− sites. In addition, the metal sulfides with plenty of S n 2− sites exhibit better Hg 0 adsorption performance.…”

Section: Raw Metal Sulfidesmentioning

confidence: 99%

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Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Deng

et al. 2022

Energy Fuels

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Atmospheric mercury (Hg) pollution has attracted global attention as a result of its great harm to the ecosystem. By virtue of abundant surface Hg-philic sulfur sites, metal sulfides have been regarded as a promising Hg adsorbent. The Hg adsorption performance of metal sulfides is mainly determined by the distribution of surface active sites; thus, it is crucial to understand the interactions between the Hg atom and different surface sites. In this review, the immobilization mechanism of the Hg atom over metal sulfides was systematically summarized. First, the roles of surface active sites, i.e., metal and sulfur sites, played in Hg 0 adsorption were systematically elaborated, to explain the excellent performance of metal sulfides. Second, the improvement on the Hg 0 adsorption ability of engineered metal sulfides was attributed to the reasonable regulation of surface unsaturation and the introduction of alien active sites. Eventually, the effects of flue gas components on mineral sulfides were illuminated from the perspective of the introduction/consumption of surface active sites. The objective of this review was to interpret the detailed Hg 0 immobilization mechanism and to provide guidance for developing metal-sulfide-based sorbents, and the future prospects and challenges related to the Hg 0 adsorption mechanism by metal sulfides were discussed.

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Section: Raw Metal Sulfidesmentioning

confidence: 95%

Section: Raw Metal Sulfidesmentioning

confidence: 99%

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Deng

et al. 2022

Energy Fuels

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“…The surface chemical state of CuS-h120 after Hg 0 removal test was analyzed by XPS. As shown in Figure a, the high-resolution S 2p XPS spectrum of the spent CuS-h120 can be divided into five main peaks located at 161.21, 162.13, 163.27, 164.25, and 168.87 eV, which can be assigned to S 2– , S 2 2– , S x 2– , and SO x 2– species, respectively . After Hg 0 adsorption, the peak position of S x 2– has no obvious change, whereas the ratio of it declines from 38.22 to 28.89%, suggesting that S x 2– species have directly reacted with Hg 0 .…”

Section: Results and Discussionmentioning

confidence: 96%

“…21 , and SO x 2− species, respectively. 44 After Hg 0 adsorption, the peak position of S x 2− has no obvious change, whereas the ratio of it declines from 38.22 to 28.89%, suggesting that S x 2− species have directly reacted with Hg 0 . Meanwhile, the percentage of S 2− increases from 40.57 to 48.13%, and the ratio of S 2 2− rises from 21.21 to 22.98%.…”

Section: Environmentalmentioning

confidence: 91%

Controllable Disordered Copper Sulfide with a Sulfur-Rich Interface for High-Performance Gaseous Elemental Mercury Capture

Cao

Xiang

et al. 2022

Environ. Sci. Technol.

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Copper sulfide (CuS) has received increasing attention as a promising material in gaseous elemental mercury (Hg 0 ) capture, yet how to enhance its activity at elevated temperature remains a great challenge for practical application. Herein, simultaneous improvement in the activity and thermal stability of CuS toward Hg 0 capture was successfully achieved for the first time by controlling the crystal growth. CuS with a moderate crystallinity degree of 68.8% showed a disordered structure yet high thermal stability up to 180 °C. Such disordered CuS can maintain its Hg 0 capture activity stable during longtime test at a wide temperature range from 60 to 180 °C and displayed strong resistance to SO 2 (6%) and H 2 O (8%). The significant improvement can be attributed to the synergistic effect of a moderately crystalline nature and a unique sulfur-rich interface. Moderate crystallinity guarantees the thermal stability of CuS and the presence of abundant defects, in which copper vacancy enhances significantly the Hg 0 capture activity. The sulfur-rich interface enables CuS to provide plentiful highly active S x 2− sites for Hg 0 adsorption. The interrelation between structure, reactivity, and thermal stability clarified in this work broadens the understanding toward Hg 0 oxidation and adsorption over CuS and provides new insights into the rational design and engineering of advanced environmental materials.

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“…HCl rather than Cl 2 accounted for the oxidation of Hg 0 on the CuO(111) surface. In 2017, He et al 68 studied the Hg 0 adsorption behaviors on transition metal-doped CuO (110) surface. Only the Zn-doped CuO(110) surface had a higher binding energy than the undoped CuO (110) surface.…”

Section: Copper Oxide (Cuo)mentioning

confidence: 99%

Copper-Based Sorbents and Catalysts for Elemental Mercury Removal from Gas Stream: A Review

Liu

2023

Ind. Eng. Chem. Res.

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Mercury emission has become a global concern due to the potential risks Hg poses to human health and the environment. Currently, copper-based compounds, such as CuCl 2 , CuO, CuS, and CuSe, have attracted great attention in mercury emission control, because of their low cost and decent removal efficiency. This review provides an overview of the recent progress on adsorptive and catalytic oxidation removal of elemental mercury over copper-based composites. Supported CuCl 2 can majorly serve as an inexpensive and efficient catalyst toward Hg 0 oxidation. Nevertheless, the high volatility and water solubility of mercury chloride may cause halogen release and a potential leaching risk of mercury, respectively. Due to its superior redox property, CuO is fairly active in Hg 0 oxidation. Metal incorporation can distinctly strengthen the mercury removal performance. However, CuO-based composites can be easily poisoned or suppressed by flue gas constituents owing to the generation of inactive copper sulfates/nitrates or competitive adsorption. CuS-based composites appear to be the most promising sorbents for mercury capture, because of strong Hg 0 affinities and remarkable tolerances to steam and sulfur dioxide. CuSe-based composites show mercury capture performances similar to those of CuS-based composites. However, tedious synthetic processes and expensive Se precursors hinder their industrial implementation.

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Favorably adjusting the pore characteristics of copper sulfide by template regulation for vapor-phase elemental mercury immobilization

Abstract: Copper sulfide (CuS) is an effective solution to address the ecosystem concern under the restriction of the Minamata Convention and mitigate the intensive elemental mercury (Hg0) pollution worldwide. However, the...

Cited by 20 publications

References 42 publications

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Controllable Disordered Copper Sulfide with a Sulfur-Rich Interface for High-Performance Gaseous Elemental Mercury Capture

Copper-Based Sorbents and Catalysts for Elemental Mercury Removal from Gas Stream: A Review

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