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Yu X, Yan C, Zhang J, He J, Zhang M, Guo X, Wu Z, Liu J, Wang X. An O/N/S-rich porous Fe-based metal-organic framework (MOF) for gold recovery from the aqueous phase with excellent performance. Sci Total Environ 2024; 927:172160. [PMID: 38575030 DOI: 10.1016/j.scitotenv.2024.172160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 03/22/2024] [Accepted: 03/31/2024] [Indexed: 04/06/2024]
Abstract
Recovering gold from wastewater has both economic and environmental benefits. However, how to effectively recover it is challenging. In this work, a novel Fe-based metal-organic framework (MOF) was synthesized and decorated with 2,5-thiophenedicarboxylic acid to have a well-developed porous architecture to effectively recover Au(III) from water. The maximum Au(III) sorption capacity by the finally-synthesized porous material MIL-101(Fe)-TDCA reached 2350 mg/g at pH = 6.00 ± 0.15, which is one of the highest among all literature-reported relevant materials including MOFs, and high sorption strength can be maintained within a wide pH range from 2.0 to 10.0. Besides, Au(III) sorption efficiency at low concentrations (i.e., 3.5 × 104 mg/mL) reached over 99%. Mechanically, outstanding Au(III) sorption by MIL-101(Fe)-TDCA resulted from the O/N/S-containing moieties on its surface, large surface area and porosity. The N- and S-containing functionalities (CS, CONH) served as electron donors to chelate Au(III). The O-containing (FeOFe, COFe, COOH, and coordinated H2O) and N-containing (CONH) moieties on MIL-101(Fe)-TDCA interacted with OH groups on the hydrolyzed species of Au(III) (AuCl3(OH)-, AuCl2(OH)2-, and AuCl(OH)3-) by hydrogen bond, which further increased Au(III) sorption. Furthermore, about 45.71% of Au(III) was reduced to gold nanoparticles by CS groups on the decorated 2,5-dithiophene dicarboxylic acid during sorption on MIL-101(Fe)-TDCA. Over 98.35% of Au(III) was selectively sorbed on MIL-101(Fe)-TDCA at pH 4.0, much higher than that of the coexisting heavy metal ions including Cu(II), Zn(II), Pb(II), and Ni(II) (< 5%), despite their same concentration at 0.01 mg/mL. Although sorption selectivity of a noble metal Pt(IV) by MIL-101(Fe)-TDCA is relatively poor (68.23%), it could be acceptable. Moreover, reusability of MIL-101(Fe)-TDCA is also excellent, since above 90.5% Au(III) still can be sorbed after two sorption-desorption cycles. Overall, excellent sorption performance and the roughly-calculated gold recycling benefits (26.30%) highlight that MIL-101(Fe)-TDCA is a promising porous material for gold recovery from the aqueous phase.
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Affiliation(s)
- Xuefeng Yu
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Chuanhao Yan
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Jinlong Zhang
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Jinglei He
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Meng Zhang
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Xiaoying Guo
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Zhipeng Wu
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Junfeng Liu
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Xilong Wang
- Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
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Pei X, Gao H, Shang C, Huang J, Ge M, Xie H, Feng Y, Wang B. One-step synthesis of phytic acid-assisted hydrochar boost selective sorption and in situ passivation of lanthanum. Sci Total Environ 2024; 917:170419. [PMID: 38296091 DOI: 10.1016/j.scitotenv.2024.170419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 12/16/2023] [Accepted: 01/22/2024] [Indexed: 02/03/2024]
Abstract
The rare earth metal element lanthanum (La) possesses carcinogenic, genotoxic, and accumulative properties, necessitating urgent development of an efficient and cost-effective method to remove La. However, current sorbents still encounter challenges such as poor selectivity, low sorption capacity, and high production costs. This study therefore proposes a promising solution: the creation of phytic acid-assisted sludge hydrochars (P-SHCs) to eliminate La from water and soil environments. This method harnesses phytic acid's exceptional binding ability and the economical hydrothermal carbonization process. P-SHCs exhibit robust sorption affinity, fast sorption kinetics, and excellent sorption selectivity for La when compared with pristine hydrochars (SHCs). This advantage arises from the remarkable binding ability of phosphate functional groups (polyphosphates) on P-SHCs, forming P-O-La complexes. Moreover, P-SHCs demonstrate sustained sorption efficiency across at least five cycles, with a slight decrease attributed to the loss of phosphorus species and mass during recycling. Furthermore, P-SHCs demonstrated superior economic feasibility, with a higher estimated cost-benefit ratio than that of other sorbents. Our study further validates the exceptional passivation capability of P-SHCs, showcasing relative stabilization efficiency ranging from 37.6 % to 79.6 % for La contamination. Additionally, acting as soil passivation agents, P-SHCs foster the enrichment of specific soil microorganisms such as Actinobacteria and Proteobacteria, capable of solubilizing phosphorus and resisting heavy metals. These findings present novel ideas and technical support for employing P-SHCs in combatting environmental pollution stemming from rare earth metals.
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Affiliation(s)
- Xiaodong Pei
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Hailong Gao
- Jiangsu Provincial Assessment Center of Ecology and Environment, Nanjing 210036, China
| | - Cenyao Shang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Junxia Huang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Mengting Ge
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Huifang Xie
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yanfang Feng
- Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, National Agricultural Experiment Station for Agricultural Environment, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Bingyu Wang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
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