The adsorption mechanisms of Hg0 on marcasite-type metal selenides: The influences of metal-terminated site

Li, Hailong; Zu, Hongxiao; Yang, Zhaoguang; Yang, Jianping; Xu, Hong; Qu, Wenqi

doi:10.1016/j.cej.2020.126723

Cited by 28 publications

(10 citation statements)

References 44 publications

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“…In compariosn to O introduction, the effects of Se introduction on the Hg 0 removal performance of metal sulfides were more extensively studied. The affinity constant of mercury to Se is 10, approximately one million times higher than its affinity to S, which is attributed to the closer energy level between Hg and Se. ,, Thus, the introduced Se sites can directly combine with Hg 0 to form mercury selenide (HgSe). ,, The low electronegativity of lattice Se sites can weaken the Hg 0 adsorption at M sites, which facilitated Hg 0 diffusion to combine with unsaturated S or Se sites . For these reasons, the Hg 0 adsorption capacity of 8Se–FeS (∼2450 μg g –1 ) was two magnitudes higher than that of bare Fe 1– x S (∼21 μg g –1 ) (Figure ).…”

Section: Engineered Metal Sulfidesmentioning

confidence: 99%

“…44 For the octahedral-coordinated M atom, its original d electrons are arranged in non-bonding orbital t 2g and antibonding orbital e g *, and the coordination strength is inversely proportional to the number of electrons in the e g * orbital (Figure 2). 45 Thus, the adsorption energy of Hg 0 at the M site of marcasite-type MSe 2 (M = Fe, Co, and Cu) followed the order of Fe > Co > Cu. For the same M sites, the coordination number is regarded as a simple descriptor to estimate the attraction of M sites toward Hg 0 , and the appropriate reduction of the coordination number can facilitate Hg 0 capture.…”

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: Engineered Metal Sulfidesmentioning

confidence: 99%

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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“…There was a certain amount of FeSe 2 and Se–Fe bond generation during the preparation process of the composite. The previous literatures reported that the adsorption of gaseous mercury by FeSe 2 was comprehensively studied by both DFT calculation and experiments. , So, this part mainly investigated the selenium–iron bond on mercury removal by DFT. Figure a–c) and Figure S9 show the models, energy band structures, and DOS diagrams of SrFeO 3‑δ , SrFeO 3‑δ /HNTs, and Se-SrFeO 3‑δ /HNTs.…”

Section: Resultsmentioning

confidence: 99%

Effective Capture and Immobilization of Hg⁰ from Flue Gas Using a Novel Selenium-Functionalized SrFeO_3-δ/HNTs Half-Metal Composite: Adsorption, Photocatalytic Oxidation, and Mechanism

et al. 2022

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One novel/multifunctional selenium-doped SrFeO3‑δ/HNTs composite was fabricated and used for immobilization of gaseous mercury. The composite showed excellent performances for Hg0 removal via adsorption coupled with photocatalytic oxidation in visible-light conditions. The adsorption capacity of 4271.15 μg·g–1, rate of 5.0 μg·g–1·min–1, and removal efficiency of ∼100% were obtained under N2+O2, which was further confirmed by reaction kinetics. SrFeO3‑δ was selenized into iron diselenide and a Se–Fe bond with high affinity toward Hg0. In addition, the yielding of •O2 – and the separation of photoexcited electrons and holes (h+) promoted the photocatalytic oxidation of mercury. The composite with intrinsic magnetism could be easily recycled for reuse by magnetic separation. Moreover, the composite possessed favorable tolerance to the complicated flue gas. An online lab-built thermal decomposition system demonstrated that the immobilized Hg was primarily HgSe, which exhibited very high stability and low toxicity. Density functional theory (DFT) calculations proved that the composite was half metal with magnetism, indicating that Hg on Se-SrFeO3‑δ/HNTs formed the stable structure releasing 1.055 eV. The doping of selenium promoted the charge transfer between O (2p) and Hg (6s), which also favored Hg0 removal. Se-SrFeO3‑δ/HNTs with recyclability possess great potentials for Hg0 efficient removal and immobilization/detoxification from flue gas.

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“…Mercury is a toxic air pollutant with high volatility, and is harmful to human health and ecosystem [1][2][3][4][5]. Thermal power plant is considered to be a main source of gaseous anthropogenic mercury emissions in China [6][7][8]. The Minamata Convention on Mercury has officially come into force in August 2017 to restrict the global anthropogenic mercury emissions [9].…”

Section: Introductionmentioning

confidence: 99%

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

Zhang¹,

Yang²,

Jing³

et al. 2022

Energy Engineering

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CuMn 2 O 4 spinel has been regarded as a highly efficient sorbent for Hg 0 capture from flue gas. The regenerability and recyclability of CuMn 2 O 4 sorbent are mainly associated with the mercury speciation adsorbed on its surface. However, the effect mechanism of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent is still elusive. Experiments were conducted to understand the effect of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent. The results indicate that CuMn 2 O 4 sorbent is a mesoporous material and possesses a good thermal stability. CuMn 2 O 4 shows >95% Hg 0 removal efficiency in a wide temperature window of 50-350 • C. The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg 0 removal performance of CuMn 2 O 4 sorbent. CuMn 2 O 4 shows a higher Hg 0 adsorption capacity of 4774.57 μg/g. Hg 0 adsorption process over CuMn 2 O 4 sorbent can be well described by the developed kinetic model. Hg 0 removal efficiency of CuMn 2 O 4 sorbent does not depend on the presence of HCl. Mercury species adsorbed on the CuMn 2 O 4 sorbent in the presence of HCl mainly exist in the forms of HgO and HgCl 2 O 8 • H 2 O. HCl shows a significant effect on mercury speciation over CuMn 2 O 4 sorbent. Most of HgO species will be transformed into HgCl 2 O 8 • H 2 O in the presence of HCl.

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The adsorption mechanisms of Hg0 on marcasite-type metal selenides: The influences of metal-terminated site

Cited by 28 publications

References 44 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

Effective Capture and Immobilization of Hg⁰ from Flue Gas Using a Novel Selenium-Functionalized SrFeO_3-δ/HNTs Half-Metal Composite: Adsorption, Photocatalytic Oxidation, and Mechanism

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

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The adsorption mechanisms of Hg0 on marcasite-type metal selenides: The influences of metal-terminated site

Cited by 28 publications

References 44 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

Effective Capture and Immobilization of Hg0 from Flue Gas Using a Novel Selenium-Functionalized SrFeO3-δ/HNTs Half-Metal Composite: Adsorption, Photocatalytic Oxidation, and Mechanism

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

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Product

Resources

About

Effective Capture and Immobilization of Hg⁰ from Flue Gas Using a Novel Selenium-Functionalized SrFeO_3-δ/HNTs Half-Metal Composite: Adsorption, Photocatalytic Oxidation, and Mechanism