1
|
Lu J, Zhang P, Li J, Cao Y, Zhang W, Zhang X, Yi X, Wang H. Mo(VI) removal from water by aluminum electrocoagulation: Cost-effectiveness analysis, main influencing factors, and proposed mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132608. [PMID: 37748311 DOI: 10.1016/j.jhazmat.2023.132608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/19/2023] [Accepted: 09/20/2023] [Indexed: 09/27/2023]
Abstract
Mo(VI) (MoO42-) removal by aluminum electrocoagulation (Al EC) with Al as anodes and cathodes was studied for the first time. At the initial Mo concentrations of 0.3 - 150 mg/L, kinetic analysis and effects of main factors (electrode connection modes, current density (CD), initial pH, and electrolytes) were examined, and potential mechanism of Mo(VI) removal were elucidated. Results showed that CD had significant impacts on anode weight loss, cathode weight loss, and total electrode weight loss (p value < 0.05). Cathode weight loss was higher than anode weight loss. XRD analysis results showed lower crystallinity of scums than that of precipitates. Boehmite was the most prevalent oxide in scums. An appropriate amount of NaCl was beneficial for enhancing the Mo(VI) removal efficiency and reducing the energy consumption of the Al EC process. Electrostatic attraction, surface complexation, hydroxyl exchange, flocculation, and coprecipitation were the main mechanisms involved in the Mo(VI) removal process by Al EC. Al EC outperformed conventional chemical coagulation in terms of Mo(VI) removal at the same dosage of Al. The Mo(VI) removal efficiencies in two real water samples (lake water and river water) reached up to 89.2% and 71.2%, respectively. This study provides novel insights into the strategies for the removal of oxoanionic metal pollutants and reduction of operating cost by Al EC technology.
Collapse
Affiliation(s)
- Jianbo Lu
- School of Civil Engineering, Yantai University, Yantai 264005, Shandong, China.
| | - Peng Zhang
- School of Civil Engineering, Yantai University, Yantai 264005, Shandong, China
| | - Jie Li
- School of Economics and Management, Yantai University, Yantai 264005, Shandong, China
| | - Yumin Cao
- School of Civil Engineering, Yantai University, Yantai 264005, Shandong, China
| | - Wei Zhang
- School of Civil Engineering, Yantai University, Yantai 264005, Shandong, China
| | - Xintong Zhang
- School of Civil Engineering, Yantai University, Yantai 264005, Shandong, China
| | - Xuesong Yi
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Hainan University, Haikou 570228, China
| | - Hongjie Wang
- School of Eco-Environment, Hebei University, Baoding 071002, Hebei, China
| |
Collapse
|
2
|
Kurmysheva AY, Vedenyapina MD, Kulaishin SA, Podrabinnik P, Pinargote NWS, Smirnov A, Metel AS, Bartolomé JF, Grigoriev SN. Adsorption Removal of Mo(VI) from an Aqueous Solution by Alumina with the Subsequent Regeneration of the Adsorbent. Int J Mol Sci 2023; 24:ijms24108700. [PMID: 37240043 DOI: 10.3390/ijms24108700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/02/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
Industrial wastewater is the main source of an excessive amount of molybdenum (Mo) in natural ecosystems. It is necessary to remove Mo from wastewater before it is discharged into the environment. Molybdate ion(VI) is the most common form of Mo in natural reservoirs and industrial wastewater. In this work, the sorption removal of Mo(VI) from an aqueous medium was evaluated using aluminum oxide. The influence of such factors as the pH of the solution and the temperature was evaluated. Three adsorption isotherms, namely, Langmuir, Freundlich and Temkin, were used to describe the experimental results. It was found that the pseudo-first order kinetic model better fits the kinetic data of the adsorption process, and the maximum Mo(VI) adsorption capacity was 31 mg/g at 25 °C and pH 4. The thermodynamic parameters indicated that the process of Mo(VI) adsorption on Al2O3 was exothermic and spontaneous. It was shown that the adsorption of Mo strongly depends on pH. The most effective adsorption was observed at pH values below 7. Experiments on adsorbent regeneration showed that Mo(VI) can be effectively desorbed from the aluminum oxide surface into a phosphate solution in a wide range of pH values. After the desorption of Mo(VI) in a phosphate solution, alumina was found to be suitable for repeating the procedure at least five times.
Collapse
Affiliation(s)
- Alexandra Yu Kurmysheva
- Laboratory of Electric Current Assisted Sintering Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
| | - Marina D Vedenyapina
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
| | - Stanislav A Kulaishin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
| | - Pavel Podrabinnik
- Laboratory of Electric Current Assisted Sintering Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
- Department of High-Efficiency Machining Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
| | - Nestor Washington Solís Pinargote
- Laboratory of Electric Current Assisted Sintering Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
| | - Anton Smirnov
- Laboratory of Electric Current Assisted Sintering Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
| | - Alexander S Metel
- Department of High-Efficiency Machining Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
| | - José F Bartolomé
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), c/Sor Juna Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain
| | - Sergey N Grigoriev
- Laboratory of Electric Current Assisted Sintering Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
- Department of High-Efficiency Machining Technologies, Moscow State University of Technology "STANKIN", Vadkovsky per. 1, 127055 Moscow, Russia
| |
Collapse
|