1
|
Zhao X, Gao X, Zhang YN, Wang M, Gao X, Liu B. Construction of dual sulfur sites in metal-organic framework for enhanced mercury(II) removal. J Colloid Interface Sci 2022; 631:191-201. [DOI: 10.1016/j.jcis.2022.10.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 10/04/2022] [Accepted: 10/29/2022] [Indexed: 11/07/2022]
|
2
|
Li H, Li Y, Tang W, Zhong H, Zhao J, Bai X, Sha S, Xu D, Lei P, Gao Y. Assessment of the Bioavailability of Mercury Sulfides in Paddy Soils Using Sodium Thiosulfate Extraction - Results from Microcosm Experiments. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 109:764-770. [PMID: 35305130 DOI: 10.1007/s00128-022-03483-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
Mercury sulfides (HgS), one of the largest Hg sinks in the lithosphere, has long been considered to be highly inert. Recently, several HgS speciation (e.g., nano- or micro-sized HgS particles) in paddy soils have been found to be reactive and bioavailable, increasing the possibility of methylation and bioaccumulation and posing a potential risk to humans. However, a simple and uniform method for investigating HgS bioavailability is still lacking. To address this issue, we extracted dissolved Hg from HgS particles by sodium thiosulfate (Na2S2O3) in paddy soils and analyzed the correlation between extracted Hg and soil methylmercury (MeHg). Results showed that the amounts of Hg extracted by Na2S2O3 had a strong positive correlation with the levels of soil MeHg (R 2 adj = 0.893, p < 0.05). It is suggested that Na2S2O3 extraction may be a good method of predicting Hg bioavailability in paddy soils. Our results would help to give clues in better predicting Hg risk in natural environments.
Collapse
Affiliation(s)
- Hong Li
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
- Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
| | - Yunyun Li
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
| | - Wenli Tang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, 210023, Nanjing, China
| | - Huan Zhong
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, 210023, Nanjing, China
| | - Jiating Zhao
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
| | - Xu Bai
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Shengnan Sha
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Diandou Xu
- Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
| | - Pei Lei
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, 210023, Nanjing, China.
| | - Yuxi Gao
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China.
| |
Collapse
|
3
|
Liang CF, Wu SH, Wang YL, Xu Z, Liu Y, Ren HT, Jia SY, Han X. The fast redox cycle of Cu(II)-Cu(I)-Cu(II) in the reduction of Cr(VI) by the Cu(II)-thiosulfate system. CHEMOSPHERE 2022; 293:133584. [PMID: 35032515 DOI: 10.1016/j.chemosphere.2022.133584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/16/2021] [Accepted: 01/09/2022] [Indexed: 06/14/2023]
Abstract
Thiosulfate (S2O32-) is an important ligand to complex metal cations, however, the reactivity of metal-thiosulfate complexes has barely been mentioned. In this study, the reactivity of the Cu(II)-S2O32- system in the reduction of Cr(VI) was investigated. Kinetic results show that the reduction rates of Cr(VI) decrease with increasing pH values from 3.0 to 5.0, and 94.3% and 97.5% of 10 mg L-1 Cr(VI) was rapidly reduced within 1 min at pH 3.0 and within 30 min at pH 5.0, respectively at the molar ratio of Cu(II):S2O32- of 0.05. We rule out the contributions of S species of tetrathionate (S4O62-) and sulfite (SO32-) to Cr(VI) reduction and point out that the produced Cu(I) in the Cu(II)-S2O32- system is the key reductant that mediates the reduction of Cr(VI). We suggest that complexation between Cu(II) and S2O32- with the formation of CuII(S2O3)22- is the pre-requisite for the formation of CuI(S2O3)n1-2n, which plays an important role in Cr(VI) reduction, accompanied by the re-oxidation of Cu(I) to Cu(II) by Cr(VI), achieving the rapid redox cycling of Cu(II)-Cu(I)-Cu(II). Such a redox cycle also mediates the denitrification process of NO2- to NH3/NH4+ under weakly acidic conditions. This study enriches our understanding on the reducing reactivity of the Cu(II)-S2O32- system and the importance of the Cu(II)-Cu(I)-Cu(II) redox cycle towards environmental oxidizing contaminants.
Collapse
Affiliation(s)
- Cheng-Feng Liang
- Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Song-Hai Wu
- Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China; College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi, 830054, Xinjiang, PR China.
| | - Yu-Le Wang
- Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Zhi Xu
- Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Yong Liu
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, 300384, PR China
| | - Hai-Tao Ren
- School of Textiles, Tiangong University, Tianjin, 300387, PR China
| | - Shao-Yi Jia
- Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Xu Han
- Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China.
| |
Collapse
|
4
|
Yang S, Li Z, Yan K, Zhang X, Xu Z, Liu W, Liu Z, Liu H. Removing and recycling mercury from scrubbing solution produced in wet nonferrous metal smelting flue gas purification process. J Environ Sci (China) 2021; 103:59-68. [PMID: 33743919 DOI: 10.1016/j.jes.2020.10.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 10/13/2020] [Accepted: 10/13/2020] [Indexed: 06/12/2023]
Abstract
Wet purification technology for nonferrous metal smelting flue gas is important for mercury removal; however, this technology produces a large amounts of spent scrubbing solution that contain mercury. The mercury in these scrubbing solutions pose a great threat to the environment. Therefore, this research provides a novel strategy for removing and recycling mercury from the scrubbing solution, which is significant for decreasing mercury pollution while also allowing for the safe disposal of wastewater and a stable supply of mercury resources. Some critical parameters for the electrochemical reduction of mercury were studied in detail. Additionally, the electrodeposition dynamics and electroreduction mechanism for mercury were evaluated. Results suggested that over 92.4% of mercury could be removed from the scrubbing solution in the form of a Hg-Cu alloy under optimal conditions within 150 min and with a current efficiency of approximately 75%. Additionally, mercury electrodeposition was a quasi-reversible process, and the controlled step was the mass transport of the reactant. A pre-conversion step from Hg(Tu)42+ to Hg(Tu)32+ before mercury electroreduction was necessary. Then, the formed Hg(Tu)32+ on the cathode surface gained electrons step by step. After electrodeposition, the mercury in the spent cathode could be recycled by thermal desorption. The results of the electrochemical reduction of mercury and subsequent recycling provides a practical and easy-to-adopt alternative for recycling mercury resources and decreasing mercury contamination.
Collapse
Affiliation(s)
- Shu Yang
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Ziliang Li
- School of Metallurgy Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China
| | - Kang Yan
- School of Metallurgy Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China; Institute of Green Metallurgy and Process Intensification, Ganzhou 341000, China
| | - Xi Zhang
- School of Metallurgy Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China
| | - Zhifeng Xu
- School of Metallurgy Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China; Institute of Green Metallurgy and Process Intensification, Ganzhou 341000, China
| | - Wanrong Liu
- Solid Waste and Chemicals Management Center, Ministry of Environmental Protection, Beijing 100024, China
| | - Zhilou Liu
- School of Metallurgy Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China; Institute of Green Metallurgy and Process Intensification, Ganzhou 341000, China.
| | - Hui Liu
- School of Metallurgy and Environment, Central South University, Changsha 410083, China.
| |
Collapse
|
5
|
Xu B, Li K, Li Q, Yang Y, Liu X, Jiang T. Kinetic studies of gold leaching from a gold concentrate calcine by thiosulfate with cobalt-ammonia catalysis and gold recovery by resin adsorption from its pregnant solution. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.12.064] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
6
|
Liu Z, Wang D, Yang S, Liu H, Liu C, Xie X, Xu Z. Selective recovery of mercury from high mercury-containing smelting wastes using an iodide solution system. JOURNAL OF HAZARDOUS MATERIALS 2019; 363:179-186. [PMID: 30308356 DOI: 10.1016/j.jhazmat.2018.09.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 08/02/2018] [Accepted: 09/01/2018] [Indexed: 06/08/2023]
Abstract
The mercury resources recovery and safe disposal of mercury-containing waste is an urgent problem. In this study, a new method using an iodide solution system was proposed to selectively recover mercury from high mercury-containing smelting wastes. The mercury leaching efficiency, yields, leaching kinetics and thermodynamics were researched. The major factors which affect mercury leaching efficiency including iodide concentration, oxidant, pH and temperature were evaluated. Over 97% and 93% of mercury can be efficiently leached from wastewater treatment sludge (W-S) and acid sludge (A-S). After leaching, the mercury concentration during leaching toxicity test is under the limits set for hazardous waste. Additionally, the electrolytic technology can efficiently recover mercury from leachate in the form of elemental mercury, and the leachate after electrolytic can be reused for mercury leaching. The mercury leaching kinetics follows the shrinking core diffusion model and is controlled by solid product diffusion. The mechanism research shows the leaching efficiency was strongly dependent on the distribution of mercury species in smelting waste. The consequence on mercury leaching and recovery could provide nonferrous smelters with a practical and yet easy-to-adopt perspective to reduce the risk of mercury contamination and selectively recover mercury resources from mercury-containing smelting wastes.
Collapse
Affiliation(s)
- Zhilou Liu
- School of Metallurgy and Chemical Engineering, JiangXi University of Science and Technology, 86 Hongqi Road, Ganzhou 341000, China
| | - Dongli Wang
- School of Metallurgy and Environment, Central South University, 93 Lushan Road, Changsha 410083, China
| | - Shu Yang
- School of Metallurgy and Environment, Central South University, 93 Lushan Road, Changsha 410083, China
| | - Hui Liu
- School of Metallurgy and Environment, Central South University, 93 Lushan Road, Changsha 410083, China
| | - Cao Liu
- School of Metallurgy and Environment, Central South University, 93 Lushan Road, Changsha 410083, China
| | - Xiaofeng Xie
- School of Metallurgy and Environment, Central South University, 93 Lushan Road, Changsha 410083, China
| | - Zhifeng Xu
- School of Metallurgy and Chemical Engineering, JiangXi University of Science and Technology, 86 Hongqi Road, Ganzhou 341000, China.
| |
Collapse
|