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Song Z, Xu Y, Zhang M, Zhu W, Yang X, Hao D, Li Q. Efficient removal of Cr (VI) by Bifunction zinc porphyrin COF: Coupling adsorption with Photocatalysis, performance Evaluation, and mechanism analysis. J Colloid Interface Sci 2024; 677:346-358. [PMID: 39096703 DOI: 10.1016/j.jcis.2024.07.140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 07/13/2024] [Accepted: 07/17/2024] [Indexed: 08/05/2024]
Abstract
HYPOTHESIS Hexavalent chromium, recognized as one of the most toxic heavy metals, demands the development of advanced materials capable of both adsorption and photocatalysis for effective Cr (VI) removal. EXPERIMENTS This study successfully synthesized a two-dimensional zinc porphyrin covalent organic framework (ZnPor-COF) via a solvent-based method. Performance evaluations have demonstrated that the ZnPor-COF possesses outstanding capabilities for the adsorptive and/or photocatalytic elimination of Cr (VI). Particularly noteworthy is the observation that when adsorption and photocatalysis are coupled, the ZnPor-COF attains an exceptional 99.7 % removal rate for a Cr (VI) concentration of 30 mg/L within just 60 min, with minimal susceptibility to coexisting ions. After five consecutive cycles, the material sustains a removal efficiency of 90 %, indicative of its robust cyclability. FINDINGS Theoretical calculations, as well as experimental validations, have indicated that the integration of Zn ions into the porphyrin COF not only results in an expanded specific surface area and an increased count of adsorption sites but also significantly improves the COF's photosensitivity and the capability for charge carrier separation. Furthermore, the core of the synergistic effect between adsorption and photocatalysis lies in the ability of photocatalysis to substantially augment the adsorption process.
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Affiliation(s)
- Zhenyang Song
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Yuting Xu
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Mengyuan Zhang
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Wei Zhu
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
| | - Xudong Yang
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Di Hao
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China
| | - Qing Li
- College of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
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2
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Peng H, Guo J, Gong Q, Zhou Q, Wang X, Liu H, He Y, Li B, Shi W. Recovery of vanadium with melamine in acidic medium. ENVIRONMENTAL TECHNOLOGY 2024; 45:2753-2761. [PMID: 36848240 DOI: 10.1080/09593330.2023.2185912] [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: 10/30/2022] [Accepted: 02/18/2023] [Indexed: 06/18/2023]
Abstract
Many hydro-metallurgical methods are developed to recover vanadium, while ammonium salt precipitation possesses the final step and it has threatened the environment. The key point is to find a new compound to replace ammonium salts without reducing vanadium recovery efficiency. Some compounds with -NH2 function groups have attracted our attention as they have similar function groups with ammonium salts. In this paper, the adsorption of vanadium with melamine is conducted. The results show that high adsorption efficiency can be achieved in a short time and melamine displays great performance in the recovery of all concentrations of vanadium. Response surface methodology (RSM) is used to optimize the reaction conditions and order the parameters: reaction temperature > concentration of vanadium > dosage of melamine > reaction time. 99.63% vanadium is adsorbed under optimized conditions: n(melamine)/n(V) = 0.6, reaction time of 60 min, 10 g/L vanadium solution and reaction temperature of 60°C. The successful application of melamine in the recovery of vanadium provides a new way for the utilization of melamine and also a glorious future for -NH2 compounds in the recovery heavy metals.
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Affiliation(s)
- Hao Peng
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
- Chongqing Jiulongyuan High-tech Industry Group Co., Ltd., Chongqing, People's Republic of China
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, People's Republic of China
| | - Jing Guo
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Qian Gong
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Qiao Zhou
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Xingxing Wang
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Huaping Liu
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Yao He
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Bing Li
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
| | - Wenbing Shi
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, People's Republic of China
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3
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Yang F, Peng Q, Wang J, Xiang L. Co-Removal of Fe/V Impurity in H 2TiO 3 Synthesized from Ti-Bearing Blast Furnace Slag. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 14:12. [PMID: 38202467 PMCID: PMC10780890 DOI: 10.3390/nano14010012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 12/11/2023] [Accepted: 12/14/2023] [Indexed: 01/12/2024]
Abstract
Ti-bearing blast furnace slag (TBFS) can be converted to impurity bearing TiOSO4 solution for TiO2 pigment production. However, the H2TiO3 (MTA) hydrolyzed from the solution has too high Fe/V impurity to meet the standard for TiO2 pigment. In this study, we found that Fe3+ and V3+ were easily hydrolyzed and entered the MTA lattice, and hence could not be removed by washing. Furthermore, Fe/V was hard to co-remove by the traditional reduction method. Therefore, the Fe/V non-hydrolysis condition (Ti3+ = 0.01 M, F = 3.0, T = 130 °C; Ti3+ = 0.01 M, F = 3.5, T = 150 °C) was determined by thermodynamic calculations. However, at these conditions, the Ti hydrolysis ratio was low or the reaction time was long. Therefore, a new two-step hydrothermal hydrolysis process was proposed. Step 1 (130 °C, 2 h) ensured the non-hydrolysis of V3+, and Ti was partially hydrolyzed to increase the H2SO4 concentration. Step 2 (150 °C, 2 h) ensured a high Ti hydrolysis ratio (>0.95) and short total reaction time (4-6 h). Finally, a high-purity MTA was obtained (Fe = 21 ppm, V = 145 ppm). These results provide new insights into the control of the hydrolysis of impurity ions in solutions and help to optimize the process of TiO2 pigment preparation from TBFS.
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Affiliation(s)
- Fan Yang
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
| | - Qiugui Peng
- School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China;
| | - Jing Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Lan Xiang
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
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4
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Lin R, Li J, Jing X, Guo M, Ren G, Qin H, Yao Z, Wan Y, Song W, Zeng H, Yang F, Zhao D, Hu K. Enhanced selective separation of vanadium(V) and chromium(VI) using the CeO 2 nanorod containing oxygen vacancies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27415-1. [PMID: 37155091 DOI: 10.1007/s11356-023-27415-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 04/30/2023] [Indexed: 05/10/2023]
Abstract
Adsorption of vanadium from wastewater defends the environment from toxic ions and contributes to recover the valuable metal. However, it is still challenging for the separation of vanadium (V5+) and chromium (Cr6+) because of their similar properties. Herein, a kind of CeO2 nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V5+ against various competitive ions (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Mg, Be, and Co). Moreover, a large separation factor (SFV/Cr) of 114,169.14 for the selectivity of V5+ is achieved at the Cr6+/V5+ ratio of 80 with the trace amount of V5+ (~ 1 mg/L). The results show that the process of V5+ uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V5+ is reduced to V3+ and V4+ and then formation of V-O complexation. This work offers a novel CeO2 nanorod material for efficient separation of V5+ and Cr6+ and also clarifies the mechanism of the V5+ adsorption on the CeO2 surface.
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Affiliation(s)
- Ruixi Lin
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Jiarong Li
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Xuequan Jing
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Meina Guo
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
| | - Guoqing Ren
- Jiangxi ECO-ADVANCE Technology Co., Ltd, Ganzhou, 341000, People's Republic of China
| | - Haonan Qin
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - Zhangwei Yao
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
| | - Yinhua Wan
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
- Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou, 341000, People's Republic of China
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Weijie Song
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
- Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou, 341000, People's Republic of China
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Huifeng Zeng
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
| | - Feifei Yang
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
| | - Da Zhao
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China
| | - Kang Hu
- Key Laboratory of Rare Earth, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, People's Republic of China.
- School of Rare Earths, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China.
- Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou, 341000, People's Republic of China.
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He K, Chen P, Yuan B, Sun F, He J, Wu P, Liu C, Jiang W. Removing trace chromium from high concentration vanadium solution by photoreduction deposition with Ti–Zr solid solution. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Abstract
Water pollution deteriorates ecosystems and is a great threat to the environment. The environmental benefits of wastewater treatment are extremely important to minimize pollutants. Here, the oxalic acid used as reductant was used to treat the wastewater which contained high concentration of vanadium (V). Nearly 100% of vanadium was efficiently reduced at selected reaction conditions. The optimization results simulated by response surface methodology (RSM) analysis indicated the parameters all had significant effects on the reduction process, and followed the order: dosage of oxalic acid > reaction temperature > reaction time > initial pH of vanadium-containing wastewater. The reduction behavior analysis indicated that the pseudo first-order kinetics model could describe well the reduction process with Ea = 42.14 kJ/mol, and was described by the equation as followed: −LnC=K0·[pH]0.1016·[n(O)/n(V)]2.4569·[T]2.2588·exp(−42.14/T)·t.
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7
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Peng H, Qiu H, Wang C, Yuan B, Huang H, Li B. Thermodynamic and Kinetic Studies on Adsorption of Vanadium with Glutamic Acid. ACS OMEGA 2021; 6:21563-21570. [PMID: 34471759 PMCID: PMC8388076 DOI: 10.1021/acsomega.1c02590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 07/29/2021] [Indexed: 06/13/2023]
Abstract
Many hydrometallurgy methods, including chemical precipitation, ion exchange, solvent extraction, and adsorption, have been used to recover vanadium from vanadium solution, but the final step of these methods involved precipitation with ammonium salts, high concentrations of which are harmful to the environment. The key point is to find a new compound to replace ammonium salts without reducing the vanadium precipitation efficiency. The adsorption process of vanadium with glutamic acid is investigated. The effects of experimental factors, including dosage of glutamic acid, reaction temperature, concentration of H2SO4, and reaction time, on the adsorption process are investigated. The results show that nearly 91.66% vanadium is adsorbed under the following reaction conditions: reaction temperature of 90 °C, H2SO4 concentration of 20 g/L, glutamic acid dosage at n(glu)/n(V) = 3.0:1, and reaction time of 60 min. The response surface methodology is applied to optimize the reaction conditions. The analysis results indicate that the reaction temperature has the greatest effect on the adsorption efficiency of vanadium and the influence of experimental factors follows the order: reaction temperature > dosage of glutamic acid to vanadium > reaction time > concentration of H2SO4. The pseudo-second-order model is selected to describe well the adsorption kinetic behavior, and the thermodynamic analysis results indicate that the adsorption process of vanadium is unspontaneous and exothermic. The results will be useful for further applications of glutamic acid, and they provide a bright future for vanadium recovery.
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Affiliation(s)
- Hao Peng
- College of Chemistry
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Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Hongzhi Qiu
- College of Chemistry
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Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Caiqiong Wang
- College of Chemistry
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Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Binfang Yuan
- College of Chemistry
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Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Huisheng Huang
- College of Chemistry
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Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Bing Li
- College of Chemistry
and
Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
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8
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Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology. Processes (Basel) 2021. [DOI: 10.3390/pr9050889] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
A highly efficient reduction process of Cr (VI) with biochar was conducted in this paper. The results showed that nearly 100% Cr (VI) was reduced at selected reaction conditions: Dosage of biochar at m (C)/m(Cr) = 3.0, reaction temperature of 90 °C, reaction time of60 min, and concentration of H2SO4 of 20 g/L. The reduction kinetics analysis demonstrated that the reduction of Cr (VI) fitted well with the pseudo-first-order model and the apparent activation energy was calculated to be 40.24 kJ/mol. Response surface methodology confirmed that all of the experimental parameters had a positive effect on the reduction of Cr (VI). The influence of each parameter on the reduction process followed the order: Dosage of biochar>concentration of H2SO4>reaction temperature >reaction time. This paper provides a versatile strategy for the treatment of wastewater containing Cr (VI) and shows a bright tomorrow for wastewater treatment.
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Prasad S, Yadav KK, Kumar S, Gupta N, Cabral-Pinto MMS, Rezania S, Radwan N, Alam J. Chromium contamination and effect on environmental health and its remediation: A sustainable approaches. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 285:112174. [PMID: 33607566 DOI: 10.1016/j.jenvman.2021.112174] [Citation(s) in RCA: 138] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 12/15/2020] [Accepted: 02/08/2021] [Indexed: 05/08/2023]
Abstract
Chromium (Cr) is a trace element critical to human health and well-being. In the last few decades, its contamination, especially hexavalent chromium [Cr(VI)] form in both terrestrial and aquatic ecosystems, has amplified as a result of various anthropogenic activities. Chromium pollution is a significant environmental threat, severely impacting our environment and natural resources, especially water and soil. Excessive exposure could lead to higher levels of accumulation in human and animal tissues, leading to toxic and detrimental health effects. Several studies have shown that chromium is a toxic element that negatively affects plant metabolic activities, hampering crop growth and yield and reducing vegetable and grain quality. Thus, it must be monitored in water, soil, and crop production system. Various useful and practical remediation technologies have been emerging in regulating chromium in water, soil, and other resources. A sustainable remediation approach must be adopted to balance the environment and nature.
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Affiliation(s)
- Shiv Prasad
- Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Krishna Kumar Yadav
- Institute of Environment and Development Studies, Bundelkhand University, Kanpur Road, Jhansi, 284128, India.
| | - Sandeep Kumar
- Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Neha Gupta
- Institute of Environment and Development Studies, Bundelkhand University, Kanpur Road, Jhansi, 284128, India
| | - Marina M S Cabral-Pinto
- Geobiotec Research Centre, Department of Geoscience, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Shahabaldin Rezania
- Department of Environment and Energy, Sejong University, Seoul, 05006, South Korea
| | - Neyara Radwan
- Faculty of Economics & Administration, King Abdulaziz University, Jeddah, Saudi Arabia; Mechanical Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt
| | - Javed Alam
- Kind Abdullah Institute for Nanotechnology, King Saud University, Riyadh, 11451, Saudi Arabia
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Peng H, Guo J, Wang B. Adsorption behavior of Fe (III) in aqueous solution on melamine. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:1848-1857. [PMID: 33201848 DOI: 10.2166/wst.2020.455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This paper focused on the adsorption behavior of Fe (III) in aqueous solution on melamine. The effects of experimental conditions including dosage of melamine, reaction time and reaction temperature were investigated. The results showed that nearly 99% Fe (III) was adsorbed under the optimal conditions: melamine dosage (mole ratio) at n(C3H6N6)/n(Fe) = 3.5:1, reaction time of 60 min and reaction temperature of 90 °C. The optimal processing factors were obtained from response surface methodology and the effects of processing parameters on the removal efficiency of Fe (III) followed the order: mole ratio (n(C3N6H6):n(Fe)) > reaction temperature > reaction time. The adsorption kinetics behavior was fitted well with the pseudo-second-order model. The thermodynamic study showed that the adsorption process was unspontaneous and endothermic. The value of free energy change and standard enthalpy change disclosed that the mechanism of adsorption onto melamine was physisorption. The results will be useful for further applications of system design in the treatment of practical waste effluents.
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Affiliation(s)
- Hao Peng
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China E-mail:
| | - Jing Guo
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China E-mail:
| | - Bingqing Wang
- Changshou Economic and Technological Development Area Development Investment Group Co., Ltd, Chongqing 408100, China
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11
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Peng H, Guo J. Reduction behavior of chromium(VI) with oxalic acid in aqueous solution. Sci Rep 2020; 10:17732. [PMID: 33082489 PMCID: PMC7575598 DOI: 10.1038/s41598-020-74928-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 10/06/2020] [Indexed: 11/16/2022] Open
Abstract
The direct Cr(VI) reduction process by oxalic acid was conducted. The existence of Cr(VI) in the reaction medium was measured by software Visual MINTEQ and the concentration of Cr(VI) was measured by ICP-OES. The results showed that the Cr(VI) was efficiently reduced by oxalic acid at high reaction temperature and high dosage of oxalic acid. The reduced product, Cr(III), was easily generated stable complex compounds (Cr(HC2O4)3) with oxalate, which displayed a negative effect on the reduction process. The high reaction temperature and high acidic medium could destroy the stable structure of a complex compound to release oxalate, and facilitate the reduction of Cr(VI). Generally, the results showed in this paper provided a versatile strategy for Cr(VI) reduction and exhibited a bright application future for real wastewater treatment.
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Affiliation(s)
- Hao Peng
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, 408100, Chongqing, People's Republic of China.
| | - Jing Guo
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, 408100, Chongqing, People's Republic of China
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