1
|
Luo Z, Tang C, Hao Y, Wang Z, Yang G, Wang Y, Mu Y. Solidification/stabilization of heavy metals and its efficiency in lead-zinc tailings using different chemical agents. ENVIRONMENTAL TECHNOLOGY 2022; 43:1613-1623. [PMID: 33135954 DOI: 10.1080/09593330.2020.1845817] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
Lead-zinc tailings are generated during the mining process which is considered as hazardous solid waste due to its high heavy metal content and leachability in the natural state. At present, the most effective technology for disposing heavy metals in solid wastes is the solidification/stabilization (S/S) technique. In terms of S/S technology, chemical stabilization is one of the most potential and practical method. This paper aims to investigate the S/S property of four typical chemical agents (Na2S, NaH2PO4, TMT and Na2EDTA) on the heavy metals in lead-zinc tailings. The results reveal that the heavy metals lead and zinc in tailings are stabilized more effectively by using chelating agents TMT than by using inorganic chemical agents Na2S and NaH2PO4. When the dosage of TMT reaches 4%, the leaching concentration of lead and zinc is 0.18 and 14.60 mg/L according to toxicity characteristic leaching procedure (TCLP), and the stabilization efficiency of lead and zinc is 99.31% and 80.92%, respectively, while the leaching concentration of lead and zinc just drops to 0.41 and 16.00 mg/L with addition of 10% NaH2PO4. Furthermore, the leaching concentration of heavy metal lead in tailings treated by 4% Na2EDTA increases to 53.44 mg/L which far exceeds the standard of pollution control. Therefore, considering stabilization efficiency and dosage, TMT is the preferred agent for solidifying heavy metals in lead-zinc tailings.
Collapse
Affiliation(s)
- Zhongtao Luo
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| | - Changbo Tang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| | - Yuhua Hao
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| | - Zhenhua Wang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| | - Guangjun Yang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| | - Yu Wang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| | - Yuandong Mu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, People's Republic of China
| |
Collapse
|
2
|
Liu H, Chen H, Xie X, Li C, Shen F, Wang P, Xiang K. Low-temperature Hg 0 abatement by ionic liquid based on weak interaction. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:127836. [PMID: 34865905 DOI: 10.1016/j.jhazmat.2021.127836] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/11/2021] [Accepted: 11/15/2021] [Indexed: 06/13/2023]
Abstract
Low-temperature gaseous elemental mercury (Hg0) abatement is an objective demand in industrial flue gas treatment. In this work, we proposed a new approach for Hg0 capture via weak interaction of ionic liquids. Ionic liquids with varied anions (1-butyl-3-methylimidazolium thioacetate ([Bmim][ThAc]), 1-butyl-3-methylimidazolium diethyldithiocarbamate ([Bmim][DTCR]), and 1-butyl-3-methylimidazolium ethylxanthate ([Bmim][EX])) were designed and synthesized. The interaction energies between ionic liquids and elemental mercury were proved to be positively related to mercury removal efficiency, revealing that the electrostatic interaction derived physical adsorption from anions is the dominant factor affecting mercury removal performance. [Bmim][ThAc] with the largest anionic electrostatic interaction energy showed the best mercury abatement performance, achieving a Hg0 removal efficiency of over 98% and an adsorption capacity of 10.66 mg/g at 50 °C. The influence of temperature and the results of mercury temperature-programmed desorption (Hg-TPD), X-ray photoelectron spectroscopy (XPS) further confirmed that the ionic liquid combines with elemental mercury through physical adsorption. The work provides a new perspective on designing high-efficiency sorbents for mercury removal at low temperature.
Collapse
Affiliation(s)
- Hui Liu
- School of Metallurgy and Environment, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 932 South Lushan Rd, Changsha, Hunan 410083, PR China
| | - Hao Chen
- School of Metallurgy and Environment, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China
| | - Xiaofeng Xie
- School of Metallurgy and Environment, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China
| | - Chaofang Li
- School of Metallurgy and Environment, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China
| | - Fenghua Shen
- School of Metallurgy and Environment, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 932 South Lushan Rd, Changsha, Hunan 410083, PR China
| | - Pingshan Wang
- College of Chemistry and Chemical Engineering, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China
| | - Kaisong Xiang
- School of Metallurgy and Environment, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China; College of Chemistry and Chemical Engineering, Central South University, 932 South Lushan Rd, Changsha, Hunan 410083, PR China.
| |
Collapse
|
3
|
Spectroscopic, antibacterial and anti-cancer studies of new platinum(II)-diethyldithiocarbamate mixed ligand complexes with phosphine or amine ligands. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
4
|
Chang L, Zhao Y, Zhang Y, Yu X, Li Z, Gong B, Liu H, Wei S, Wu H, Zhang J. Mercury species and potential leaching in sludge from coal-fired power plants. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123927. [PMID: 33264977 DOI: 10.1016/j.jhazmat.2020.123927] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 09/02/2020] [Accepted: 09/02/2020] [Indexed: 06/12/2023]
Abstract
Wet flue gas desulfurization (WFGD) sludge, generated from the WFGD effluent treatment process, is suitable for multiple uses in various industries. However, risk assessments of its utilization are limited. Systematic study of Hg species occurrences, partitioning and risks of leaching is required, and these concerns were addressed in the present study. Hg temperature-programmed decomposition (Hg-TPD) and an improved European Community Bureau of Reference (BCR) method indicated residual Hg in WFGD sludge was related to HgS, and the content of this fraction was from 2 to 3%. HgCl2, HgO and HgSO4 were assigned to the water/acid-soluble fractions, and reducible Hg was related to Fe species in the sludge. Leachate evaluation of the WFGD sludge indicated potentially high Hg leaching risk. WFGD sludge with higher Hg concentrations and smaller particulate diameters exhibited greater leaching potential. Leaching of Hg from WFGD sludge in China into the environment was estimated at 7.46 t/yr.
Collapse
Affiliation(s)
- Lin Chang
- State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd., Beijing 100018, China
| | - Yongchun Zhao
- State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Yi Zhang
- Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd., Beijing 100018, China
| | - Xuehai Yu
- Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd., Beijing 100018, China
| | - Zenghua Li
- State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Bengen Gong
- State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Huan Liu
- State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Shuzhou Wei
- Sanhe Power Plant Co., Ltd., Hebei, Lanfang 065201, China
| | - Hao Wu
- Guangzhou Hengyun Enterprises Holdings Limited, Guangzhou 510730, China
| | - Junying Zhang
- State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| |
Collapse
|
5
|
He F, Zhu X, Chen X, Ding J. Evaluation of Fe
II
EDTA‐NO reduction by thiourea dioxide in NO removal with Fe
II
EDTA. ASIA-PAC J CHEM ENG 2019. [DOI: 10.1002/apj.2397] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Feiqiang He
- State Key Laboratory for Nuclear Resources and Environment, School of Chemistry, Biology and Materials ScienceEast China University of Technology Nanchang China
| | - Xinyu Zhu
- State Key Laboratory for Nuclear Resources and Environment, School of Chemistry, Biology and Materials ScienceEast China University of Technology Nanchang China
| | - Xianchun Chen
- State Key Laboratory for Nuclear Resources and Environment, School of Chemistry, Biology and Materials ScienceEast China University of Technology Nanchang China
| | - Jianhua Ding
- State Key Laboratory for Nuclear Resources and Environment, School of Chemistry, Biology and Materials ScienceEast China University of Technology Nanchang China
| |
Collapse
|
6
|
Ma T, Sheng Y, Meng Y, Sun J. Multistage remediation of heavy metal contaminated river sediments in a mining region based on particle size. CHEMOSPHERE 2019; 225:83-92. [PMID: 30861386 DOI: 10.1016/j.chemosphere.2019.03.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 02/27/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Sediment pollution is an important environmental problem, and the remediation of heavy metal contaminated sediments is crucial to river ecosystem protection, especially in mining regions. In this work, characteristics of heavy metals (Cu, Zn, Cd, As and Hg) were investigated, including contents and fractions based on particle size (PS) in river sediments. Chemical leaching and stabilization for sediment remediation were performed, and the technology feasibility was assessed. The results indicated that the heavy metals were primarily reserved within fine sediments (PS < 75 μm), comprising 79.8% of the total. For the sequentially extracted fractions, residual fraction dominated the total content in large PS sections (PS > 150 μm), while the oxidizable fraction, reducible fraction and weak acid extractable fraction dominated the total content in fine sediments, except for that of Hg. Chemical leaching can transform most metals in sediments from large-sized particles to fine particles because the metals are absorbed by fine particles in solution rather than complexation. The stabilization suggested that cement could be an effective agent for ecological risk control for heavy metals. In field engineering, a total of 145,000 m3 sediment was divided into various sections by PS and synchronously washed by eluting agents. Finally, clean sediments (PS > 150 μm) were used as building material and clean backfilling; meanwhile, heavily polluted sediments (PS < 150 μm) were buried as general industrial solid waste after stabilization treatment. Over 90% of the contaminated sediments were reused throughout multistep remediation. Furthermore, a reduction in waste and harm, along with resources, was obtained. This study provided a feasible technology for heavy metal contaminated sediment remediation.
Collapse
Affiliation(s)
- Tao Ma
- Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264000, PR China; Shandong Academy of Environmental Science Co., LTD., Jinan, 250100, PR China
| | - Yanqing Sheng
- Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264000, PR China.
| | - Yingjie Meng
- Shandong Academy of Environmental Science Co., LTD., Jinan, 250100, PR China
| | - Jianzhang Sun
- Shandong Academy of Environmental Science Co., LTD., Jinan, 250100, PR China
| |
Collapse
|
7
|
Liu W, Duan H, Wei D, Cui B, Wang X. Stability of diethyl dithiocarbamate chelates with Cu(II), Zn(II) and Mn(II). J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.02.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
8
|
Zhu X, He F, Xia M, Liu H, Ding J. Evaluation of Fe(iii)EDTA reduction with ascorbic acid in a wet denitrification system. RSC Adv 2019; 9:24386-24393. [PMID: 35527871 PMCID: PMC9069671 DOI: 10.1039/c9ra02678a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 07/04/2019] [Indexed: 11/21/2022] Open
Abstract
The reduction of Fe(iii)EDTA to Fe(ii)EDTA is the core process in a wet flue gas system with simultaneous desulfurization and denitrification. Herein, at first, the reductant ascorbic acid (VC) was used for reducing Fe(iii)EDTA. The feasibility of Fe(iii)EDTA reduction with ascorbic acid was investigated at different Fe(iii)EDTA concentrations, various pH values, diverse temperatures, and different molar ratios of VC to Fe(iii)EDTA. The results showed that the Fe(ii)EDTA concentration increased with an increase in the initial Fe(iii)EDTA concentration. Furthermore, the reduction efficiency increased as the mole ratio of VC to Fe(iii)EDTA was increased, and all the Fe(iii)EDTA reduction efficiencies were close to 100% when the mole ratio was more than 0.5. On the other hand, an alkaline environment did not favor the conversion of Fe(iii)EDTA by VC. The Fe(iii)EDTA conversion slightly increased as the temperature was increased. Moreover, compared with other reduction systems, ascorbic acid (VC) was found to be more powerful in reducing Fe(iii)EDTA, especially in air. In addition, VC only exhibited powerful ability in the conversion of Fe(iii)EDTA to Fe(ii)EDTA and hardly reduced Fe(ii)EDTA–NO. Finally, the stoichiometry of Fe(iii)EDTA reduction by ascorbic acid was derived. Thus, our study would offer a bridge between foundational research and industrial denitration using the combination of Fe(ii)EDTA and VC. Color change during Fe(iii)EDTA reduction by VC ((A) Fe(iii)EDTA color; (B) color of Fe(iii)EDTA solution after reduction by VC; (C) Fe(ii)EDTA-NO color; (D) color of Fe(ii)EDTA-NO solution after reduction by VC).![]()
Collapse
Affiliation(s)
- Xinyu Zhu
- State Key Laboratory for Nuclear Resources and Environment
- School of Chemistry
- Biology and Materials Science
- East China University of Technology
- Nanchang 330013
| | - Feiqiang He
- State Key Laboratory for Nuclear Resources and Environment
- School of Chemistry
- Biology and Materials Science
- East China University of Technology
- Nanchang 330013
| | - Meng Xia
- State Key Laboratory for Nuclear Resources and Environment
- School of Chemistry
- Biology and Materials Science
- East China University of Technology
- Nanchang 330013
| | - Honggen Liu
- State Key Laboratory for Nuclear Resources and Environment
- School of Chemistry
- Biology and Materials Science
- East China University of Technology
- Nanchang 330013
| | - Jianhua Ding
- State Key Laboratory for Nuclear Resources and Environment
- School of Chemistry
- Biology and Materials Science
- East China University of Technology
- Nanchang 330013
| |
Collapse
|