Adsorption and Oxidation of Elemental Mercury on Chlorinated ZnS Surface

Li, Hailong; Feng, Shihao; Qu, Wenqi; Yang, Jianping; Liu, Suojiang; Liu, Yang

doi:10.1021/acs.energyfuels.8b01188

Cited by 22 publications

(15 citation statements)

References 54 publications

(75 reference statements)

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“…Adsorbents based on sulfur-treated carbons, alumina, and zeolites, have been among the most commonly investigated materials that are able to capture mercury from the environment [ 11 ]. More recently, ZnS nanoparticles (NPs) have been developed and variously implemented as alternatives to remove Hg 0 from polluted environments [ 12 ]. The strong affinity between heavy metals (e.g., mercury) and noble metals, such as gold and silver, has been also investigated in literature as a suitable strategy to capture and reveal such a pollutant in air.…”

Section: Introductionmentioning

confidence: 99%

Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO2NP/AuNP Layer

et al. 2018

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Passive sampling systems (PASs) are a low cost strategy to quantify Hg levels in air over both different environmental locations and time periods of few hours to weeks/months. For this reason, novel nanostructured materials have been designed and developed. They consist of an adsorbent layer made of titania nanoparticles (TiO2NPs, ≤25 nm diameter) finely decorated with gold nanoparticles. The TiO2NPs functionalization occurred for the photocatalytic properties of titania-anatase when UV-irradiated in an aqueous solution containing HAuCl4. The resulting nanostructured suspension was deposited by drop-casting on a thin quartz slices, dried and then incorporated into a common axial sampler to be investigated as a potential PAS device. The morphological characteristics of the sample were studied by High-Resolution Transmission Electron Microscopy, Atomic Force Microscopy, and Optical Microscopy. UV-Vis spectra showed a blue shift of the membrane when exposed to Hg0 vapors. The adsorbed mercury was thermally desorbed for a few minutes, and then quantified by a mercury vapor analyzer. Such a sampling system reported an efficiency of adsorption that was equal to ≈95%. Temperature and relative humidity only mildly affected the membrane performances. These structures seem to be promising candidates for mercury samplers, due to both the strong affinity of gold with Hg, and the wide adsorbing surface.

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Section: Introductionmentioning

confidence: 99%

Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO2NP/AuNP Layer

et al. 2018

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“…To date, mercury emission control technologies of thermal power plants mainly include: sorbent injection [11][12][13][14][15][16], catalytic oxidation [17][18][19][20] and bromide addition [21][22][23]. The technical strategy of catalytic oxidation and bromide addition is to oxidize Hg 0 into Hg 2+ , which is subsequently removed by the wet flue gas desulfurization equipment.…”

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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“…Mercury pollution has attracted extensive attention due to its intense volatility, high toxicity, and bioaccumulation, which is seriously harmful to the ecosystem and biological health. − The current atmospheric mercury concentration is higher than 450% of natural levels due to human activities. The global anthropogenic atmospheric mercury emissions in 2015 had reached 2220 t, which was approximately 20% higher than that in 2010 .…”

Section: Introductionmentioning

confidence: 99%

Different Crystal Forms of ZnS Nanomaterials for the Adsorption of Elemental Mercury

Yang

Huang

et al. 2021

Environ. Sci. Technol.

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ZnS is a promising sorbent in recovering Hg0 from industrial flue gas due to its excellent Hg0 adsorption capacity. However, the internal structure–activity relationship still needs to be further clarified. In this work, ZnS sorbents with different structures were synthesized with the hydrothermal method by tuning the temperature. The samples had significant differences in the crystallinity, morphology, particle size, and sulfur (S) active sites. The results indicated that Hg0 removal performance was determined by the specific surface area and S active sites. ZnS synthesized at low temperatures (80-ZnS and 120-ZnS) had a larger surface area, while the S sites on the high-temperature-synthesized sample (160-ZnS) were more active for Hg0 adsorption. The 160-ZnS sample exhibited a much higher Hg0 adsorption amount per unit surface area. Further characterization revealed that S2 2– and S x were the main active sites for Hg0 adsorption. S x existed in the form of long-chain polysulfur (L-S x ) on 80-ZnS and 120-ZnS, while it exhibited in the form of short-chain polysulfur (S-S x ) on 160-ZnS. L-S x had negligible adsorption ability, while S-S x had a high affinity for Hg0. Hg0 can react with S2 2– and S-S x , forming α-HgS and β-HgS, respectively. The new insight in this work can provide theoretical guidance for the design and structure optimization of ZnS, facilitating its practical industrial application.

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Adsorption and Oxidation of Elemental Mercury on Chlorinated ZnS Surface

Cited by 22 publications

References 54 publications

Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO2NP/AuNP Layer

Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO2NP/AuNP Layer

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

Different Crystal Forms of ZnS Nanomaterials for the Adsorption of Elemental Mercury

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