CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yongpeng Ma,Jiandong Wang,Wentao Gu,Xiaojing Zhang,Haomiao Xu,Wenjun Huang,Yonghui Guo,Shaobo Wang
Herein, MoS 2 was used in a MoS 2 /H 2 O heterogeneous system for the heterogeneously catalyzed removal of Hg 0 from flue gas. Hg 0 removal efficiency reached 77.6% at 25 °C when the dosage of MoS 2 was 0.200 g/L in aqueous suspension. The observed effects of MoS 2 dosage and inlet Hg 0 concentration on Hg 0 removal efficiency revealed that the gas–liquid mass transfer process is the limiting step of Hg 0 removal. Low pH and low temperature were conducive to Hg 0 removal. SO 2 in the flue gas was absorbed by MoS 2 , and the simultaneous decrease in solution pH resulted in a slight increase in Hg 0 removal efficiency. The presence of NO in the flue gas enhanced Hg 0 removal efficiency. Common anions, such as NO 3 − , SO 4 2− , and CO 3 2− , have no obvious effect on Hg 0 removal. However, Cl − improved Hg 0 removal efficiency by 11% because of the production of HgCl n 2−n . The kinetics and mechanism of Hg 0 removal were studied, and the results indicated that Mo acted as a bridge and catalyst for Hg 0 oxidation, while S immobilized Hg 2+ by formation of HgS on MoS 2 .
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Chao Han,Wei Wang,Feng Xie,Ting'an Zhang
Mercury is one of the most severe environmental pollutants due to its high toxicity, and the detoxification of mercury-containing solid wastes is a critical issue worldwide. In this work, thiosulfate solution has been used to leach mercury from mercuric sulfide. The influence of leaching conditions, including initial pH, molar ratio of copper to thiosulfate ([Cu]/[S 2 O 3 2− ]), and temperature on mercury leaching from mercuric sulfide, was investigated. The mercury leaching rate can reach as high as 92.37% after 7-h leaching under the optimized condition of initial pH 8.50, molar ratio of copper to thiosulfate 0.1 and leaching temperature 313 K. X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) was used to analyze the leaching residue. The results show that copper in its thiosulfate complex can be substituted by mercury via Lewis substitution and cuprous sulfide was formed on the surface of leaching residue. The kinetics of mercuric sulfide leaching with cuprous-thiosulfate solutions was controlled by the product layer diffusion.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Songyuan Sun,Haomiao Xu,Yurui Fan,Zhisong Liu,Qinyuan Hong,Wenjun Huang,Zan Qu,Naiqiang Yan
The polyvinylchloride industry is an important mercury emission source derived from the decomposition of commercial activated carbon-supported mercuric chloride (HgCl2/AC, with 12–15 wt % HgCl2) in acetylene hydrochlorination. Our results indicated that the loss of mercury was ascribed to the Hg–Cl bond breaking from the HgCl2 molecule at elevated temperatures that resulted in slip Hg0 in the exhausted gas. Herein, we employed a novel strategy that uses chalcogen bonding (ChB, e.g., S-, Se-, and Te-) interactions to anchor HgCl2 molecules, to improve the thermal stability and catalytic performances. The mercury desorption temperature reached approximately 300 °C, which is much higher than the optimum hydrochlorination reaction temperature. Notably, low-mercury catalysts (5 wt % HgCl2) guaranteed high catalytic performances, and Se–HgCl2/AC exhibited 83% acetylene conversion efficiency and near-perfect 100% selectivity. Moreover, the online mercury monitoring results showed that Se–ChB significantly inhibited the escape of mercury during the reaction. Density functional theory results confirmed that the reaction followed an Eley–Rideal (E–R) mechanism, which showed that the strong adsorption of HCl endowed the catalyst with superior durability and facilitated the reaction by reducing the energy barrier from 0.94 to 0.54 eV. Thus, the new strategy for highly stable low-mercury catalyst preparation can solve the problem of mercury contamination and enhance the productivity of PVC production.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jianping Yang,Xingyue Zhou,Wei Zheng,Penglin Zhu,Fanyue Meng,Zequn Yang,Wenqi Qu,Hailong Li
Efficiently removing elemental mercury (Hg 0 ) from natural gas is a serious task to both equipment safety and ecosystem. The granulation of adsorbent powder is required to reduce pressure loss and adsorbent elutriation from a fixed-bed demercuration system. Herein, urea modified CuO (Urea/CuO) pellets were developed for Hg 0 adsorption from natural gas with H 2 S. The characterization results show that the addition of urea accelerated the formation of pore structure and surface oxygen, thus enhancing the Hg 0 adsorption performance of CuO pellets. The Urea/CuO pellets with 20 % urea additive amount exhibited 93 % Hg 0 removal efficiency under the existence of 500 ppm H 2 S and a gaseous hourly space velocity of 1.21 × 10 5 h −1 . H 2 S was essential to in-situ convert Urea/CuO pellets into a highly active Hg 0 adsorbent. With the increase of H 2 S concentration from 0 to 1000 ppm, the Hg 0 removal efficiency was raised from 34 % to 93 %. Urea/CuO pellets performed well for Hg 0 adsorption at 10–50 °C, which was the representative temperature window of natural gas processing. The Hg 0 adsorption capacity and uptake rate of Urea/CuO with 500 ppm H 2 S reached as high as 27.06 mg·g −1 and 2.44 μg·g −1 ·min −1 , which largely exceeded those of commercial activated carbons specialized for Hg 0 adsorption as well as typical granulated Hg 0 adsorbents reported in previous literature. The existence of H 2 S in natural gas in-situ converted CuO into CuS. The S 2 2− on the formed CuS could act as active sites for Hg 0 adsorption, in which gaseous Hg 0 was captured as stable mercury sulfide (HgS). The deactivated adsorbent could be regenerated and reused by thermally decomposing HgS and replenishing the consumed surface oxygen and the sintering surface. With these advantages, the developed Urea/CuO pellets appears to be a promising Hg 0 adsorbent from natural gas with H 2 S.
研究领域:
环境工程
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材料科学
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化学工程
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气体净化
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污染控制
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产品关联
DOI
高影响因子
GEOCHIMICA ET COSMOCHIMICA ACTA
·
2025
·
IF 5
Qingyi Cao,Junyi Liu,Jicheng Xia,Jen-How Huang,Susan Glasauer,Haiyan Hu,Xinbin Feng
Mineral-associated mercury (Hg), predominantly as mercury sulfide (HgS), represents the largest environmental Hg reservoir and is typically considered immobile and inert. Here, we reveal a novel microbe-mediated mechanism for the bioleaching of crystalline HgS via cysteine secreted by microorganisms. Hg-resistant bacterial strains Arthrobacter sp. WS-B1, Massilia sp. WS-B3, and Serratia sp. WS-B5, isolated from Wanshan mining soils in China, were found to secrete cysteine, which promotes the disintegration of crystalline HgS into HgS nanoparticles (HgSNPs), dissolved Hg, and ultimately volatile Hg(0). Utilizing transmission electron microscopy with energy-dispersive X-ray spectroscopy, HgS breakdown was evidenced through the detection of HgSNPs and a broadened Hg:S ratio range from 1.08 ± 0.05 to 0.33–1.58. Time-of-flight secondary ion mass spectrometry analysis revealed the co-localisation of C 3 H 7 NO 2 S and Hg, indicating Hg–cysteine complexation. These complexes inhibited Hg precipitation, maintaining its bioavailability for crops, while also enabling photoreduction via ligand-to-metal charge transfer upon irradiation to detoxify soil Hg. This study sheds light on the microbial transformation of crystalline HgS, the formation pathways of HgSNPs in nature, and the enhanced bioavailability of Hg previously considered inert
研究领域:
环境微生物学
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地球化学
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环境科学
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生物地球化学
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微生物生态学
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产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2015
·Vol. 32
·期 9
·816-823
·
IF 0.991
Yafeng Ren,Jianxin Zhu
A large volume of waste mercury chloride catalyst (HgCl2) is generated by calcium carbide-based polyvinyl chloride production in China, which accounts for 30% of global mercury consumption. However, there are few studies on the leaching behavior and risk control of waste catalyst where mercury is in the form of HgCl2, which is more soluble than metal mercury and poses great threat to human health and environment. This study investigated mechanochemical stabilization and leaching behavior of waste mercury catalyst using sulfur as additive. We found that mercuric sulfide (HgS) formed through mechanical milling, although the reaction between HgCl2 and S is not thermodynamically favored. Moreover, toxicity characteristic leaching procedure (TCLP) results showed mercury leaching values are lower than the TCLP limit value of 0.2 mg/L after mechanochemical treatment. Results of sequential extraction procedure showed that ball mill could transfer more than 99.9% of the Hg in the catalyst to the least mobile fraction.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Yuping Xiang,Yueqian Chen,Yingying Guo,Yanwei Liu,Guangliang Liu,Yongguang Yin,Dingyong Wang,Yong Cai,Guibin Jiang
How organic ligands regulate microbial Hg(II) bioavailability remains a critical knowledge gap in elucidating methylmercury production and subsequent bioaccumulation in biota. Six model ligands with different functional groups (ethylenediaminetetraacetate [EDTA], citrate [CTA], cysteine [CYS], glutathione [GSH], 2, 3-dimercapto-1-propanesulfonate [DMPS], and 3-mercapto-1-propanesulfonate [MPS]) were applied to probe their impacts on Hg(II) bioavailability, by direct measurement of active cellular Hg(II) and cell physiology using a Hg(II)-specific ( Escherichia coli PRL) and a constitutive biosensor ( E. coli PJL), respectively. Hg(II) uptake was significantly inhibited by EDTA, CTA, DMPS, and MPS, whereas enhanced by CYS and GSH. These findings indicate co-occurred uptake mechanism other than the widely accepted membrane-ligand exchange model, since bioavailability did not inversely correlate with Hg-binding strength (CTA < EDTA < GSH < CYS < DMPS). Furthermore, ligand-induced bacterial physiological changes (e.g., thiolate inhibition vs. carboxylate neutrality) were not the primary driver of bioavailability variations. Based on Hg(II) speciation analysis and thermodynamic modelling, it was implied that sulfate reduction and CYS degradation generated sulfide corona near bacterial cells, promoting the formation of Hg sulfide nanoparticles (HgS NP ) or Hg-S clusters during Hg(II) uptake. Enhanced bioavailability of Hg(II)-CYS/GSH likely arose from passive diffusion and intracellular dissolution of these HgS species. Ambient oxygen levels further modulate Hg(II) bioavailability, with enhanced Hg(II)-CYS uptake observed under anoxic conditions, likely due to oxygen-dependent transporters expression and bacterial metabolisms. Overall, these findings highlight ligand-specific mechanisms governing Hg(II) bioavailability, emphasizing the interactions of Hg-binding strength, cell physiology, and sulfide-driven speciation in Hg biogeochemical cycling.
研究领域:
环境微生物学
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生物地球化学
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环境化学
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微生物生理学
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毒理学
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产品关联
DOI
PubMed
高影响因子
Nature Geoscience
·
2021
·Vol. 14
·期 6
·409-416
·
IF 16.908
Tian Li,Guan Wenyu,Ji Yunyun,He Xin,Chen Wei,Alvarez Pedro J. J.,Zhang Tong
Environmental contamination by mercury in its organometallic form, methylmercury, remains a major global concern due to its neurotoxicity, environmental persistence and biomagnification through the food chain. Accurate prediction of mercury methylation cannot be achieved based on aqueous speciation alone, and there remains limited mechanistic understanding of microbial methylation of particulate-phase mercury. Here we assess the time-dependent changes in structural properties and methylation potential of nanoparticulate mercury using microscopic and spectroscopic analyses, microcosm bioassays and theoretical calculations. We show that the methylation potential of a mercury sulfide mineral ubiquitous in contaminated soils and sediments (nanoparticulate metacinnabar) is determined by its crystal structure. Methylmercury production increases when more of nano-metacinnabar’s exposed surfaces occur as the (111) facet, due to its large binding affinity to methylating bacteria, likely via the protein transporter responsible for mercury cellular uptake prior to methylation. During nanocrystal growth, the (111) facet diminishes, lessening methylation of nano-metacinnabar. However, natural ligands alleviate this process by preferentially adsorbing to the (111) facet, and consequently hinder natural attenuation of mercury methylation. We show that the methylation potential of nanoparticulate mercury is independent of surface area. Instead, the nano-scale surface structure of nanoparticulate mercury is crucial for understanding the environmental behaviour of mercury and other nutrient or toxic soft elements.
研究领域:
环境科学
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化学
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微生物学
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材料科学
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DOI
高影响因子
JOURNAL OF DRUG TARGETING
·
2024
·
IF 4.3
Can Wang,Yihang Yang,Ruming Liang,Shikui Wu,Chengrui Xuan,Wei Lv,Jian Li
We successfully prepared mercury sulphide nanoparticle hydrogels by physical encapsulation method. The successfully prepared mercuric sulphide nanoparticle hydrogel was a zinc folate hydrogel, which showed an obvious porous structure with interconnected and uniformly distributed pores and a pore size range of about 20 μm. The maximum drug loading of the hydrogels was 3%, and the in vitro cumulative release degree was in accordance with the first-order kinetic equation Mt = 149.529 (1 − e−0.026t). The particles in mercuric sulphide nanoparticle hydrogels significantly down-regulated the expression of the cell surface co-stimulatory molecule CD86 (p < .0001). Meanwhile, the inflammatory response was regulated through the NF-κB pathway in LPS-induced inflammatory cells. Later, it was observed that mercuric sulphide nanoparticle hydrogels could significantly counteract the inflammatory and immune models through a mouse ear swelling model, a rat foot-plantar swelling model and a rheumatoid arthritis model. This design targets the immunomodulatory, and anti-inflammatory effects through nanocomposite hydrogel technology. It reduces the drawbacks of low mercury utilisation and susceptibility to accumulation of toxicity. It aims to provide an experimental basis for the development of mercuric sulphide and the treatment of inflammatory and immune-related diseases.
HighlightsMercury sulphide nanoparticle hydrogel has an optimal mercury sulphide nanoparticle content of 2%, is structurally homogeneous and stable, and does not exhibit significant liver or kidney toxicity.Mercuric sulphide nanoparticle hydrogel exerts anti-inflammatory effects in cells and rats, and regulates the expression of macrophage surface molecules and factors related to the NF-κB pathway.Mercuric sulphide nanoparticle hydrogel improves the condition of ankle synovial joints in a rat model of rheumatoid arthritis.
研究领域:
纳米技术
·
药学
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免疫学
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炎症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）