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Shi J, Peng SQ, Kuang B, Wang S, Liu Y, Zhou JX, Li X, Huang MH. Porous Polypyrrolidines for Highly Efficient Recovery of Precious Metals through Reductive Adsorption Mechanism. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2405731. [PMID: 38857110 DOI: 10.1002/adma.202405731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 05/28/2024] [Indexed: 06/11/2024]
Abstract
The recycling and utilization of precious metals have emerged as a critical research focus in advancing the development of the circular economy. Among numerous methods for recovering precious metals such as gold, adsorbents with both high adsorption selectivity and capacity have become key technologies. This article incorporated the N-phenylpyrrolidine into a flexible porous polynorbornene backbone to create a class of distinctive porous organic polymers, named BIT-POP-14-BIT-POP-17. Through a reductive capture mechanism, the reductive adsorption sites of N-phenylpyrrolidine coordinate selectively with precious metals, the reduced metal is captured by the hierarchically porous polymers with flexible backbone. This approach leads to remarkable gold recovery efficiency, achieving a record of 2321 mg g-1 at ambient conditions, and 3020 mg g-1 under UV light, surpassing the theoretical limit. The porous polymers are filled in a column for a continuous uptake of gold from waste printed circuit boards (PCBs), showing recovery efficiency toward gold as high as 95% after 84 h. Overall, this work offers a new perspective on designing novel adsorbents for precious metal recovery, providing inspiration for researchers to explore novel adsorption modes and contribute to the advancement of the circular economy.
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Affiliation(s)
- Jing Shi
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Shan-Qing Peng
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Boya Kuang
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Shuifeng Wang
- Analytical and Testing Center, Beijing Normal University, No. 19 Xinjiegouwai Street, Haidian District, Beijing, 100875, China
| | - Yan Liu
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Jin-Xiu Zhou
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Xiaodong Li
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
| | - Mu-Hua Huang
- Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China
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Fu K, Liu X, Zhang X, Zhou S, Zhu N, Pei Y, Luo J. Utilizing cost-effective pyrocarbon for highly efficient gold retrieval from e-waste leachate. Nat Commun 2024; 15:6137. [PMID: 39033214 PMCID: PMC11271467 DOI: 10.1038/s41467-024-50595-4] [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: 01/23/2024] [Accepted: 07/12/2024] [Indexed: 07/23/2024] Open
Abstract
Addressing burdens of electronic waste (E-waste) leachate while achieving sustainable and selective recovery of noble metals, such as gold, is highly demanded due to its limited supply and escalating prices. Here we demonstrate an environmentally-benign and practical approach for gold recovery from E-waste leachate using alginate-derived pyrocarbon sorbent. The sorbent demonstrates potent gold recovery performance compared to most previously reported advanced sorbents, showcasing high recovery capacity of 2829.7 mg g-1, high efficiency (>99.5%), remarkable selectivity (Kd ~ 3.1 × 108 mL g-1), and robust anti-interference capabilities within environmentally relevant contexts. The aromatic structures of pyrocarbon serve as crucial electrons sources, enabling a hydroxylation process that simultaneously generates electrons and phenolic hydroxyls for the reduction of gold ions. Our investigations further uncover a "stepwise" nucleation mechanism, in which gold ions are reduced as intermediate gold-chlorine clusters, facilitating rapid reduction process by lowering energy barriers from 1.08 to -21.84 eV. Technoeconomic analysis demonstrates its economic viability with an input-output ratio as high as 1370%. Our protocol obviates the necessity for organic reagents whilst obtaining 23.96 karats gold product from real-world central processing units (CPUs) leachates. This work introduces a green sorption technique for gold recovery, emphasizing its role in promoting a circular economy and environmental sustainability.
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Affiliation(s)
- Kaixing Fu
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xia Liu
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, 266071, China
| | - Xiaolin Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
| | - Shiqing Zhou
- Hunan Engineering Research Center of Water Security Technology and Application, College of Civil Engineering, Hunan University, Changsha, 410082, China
| | - Nanwen Zhu
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yong Pei
- Department of Chemistry, Xiangtan University, Xiangtan, 411105, China
| | - Jinming Luo
- State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
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Ahmad A, Khan SUD, Khan R, Haneklaus N. Efficient and sustainable extraction of uranium from aquatic solution using biowaste-derived active carbon. Front Chem 2023; 11:1327212. [PMID: 38179238 PMCID: PMC10765602 DOI: 10.3389/fchem.2023.1327212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 12/08/2023] [Indexed: 01/06/2024] Open
Abstract
Efficient and cost-effective biosorbents derived from biowaste are highly demanding to handle various environmental challenges, and demonstrate the remarkable synergy between sustainability and innovation. In this study, the extraction of uranium U(VI) was investigated on biowaste activated carbon (BAC) obtained by chemical activation (phosphoric acid) using Albizia Lebbeck pods as biowaste. The biowaste powder (BP), biowaste charcoal (BC) and BAC were evaluated by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) with nitrogen adsorption for thermal properties, chemical structures, porosity and surface area, respectively. The pHPZC for acidic or basic nature of the surface and X-ray diffraction (XRD) analysis were performed for BAC. The morphological and elemental analysis were performed by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). The extraction of uranium U(VI) ions from aqueous solutions using BAC as sorbent was investigated by using different variables such as pH, contact time, initial uranium U(VI) concentration and BAC dose. The highest adsorption (90.60% was achieved at 0.5 g BAC dose, 2 h contact time, pH 6, 10 ppm initial U(VI) concentration and with 200 rpm shaking speeds. The production of this efficient adsorbent from biowaste could be a potential step forward in adsorption of uranium to meet the high demand of uranium for nuclear energy applications.
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Affiliation(s)
- Ashfaq Ahmad
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Salah Ud-Din Khan
- Sustainable Energy Technologies Center, College of Engineering, King Saud University, Riyadh, Saudi Arabia
| | - Rawaiz Khan
- Engineer Abdullah Bugshan Research Chair for Dental and Oral Rehabilitation, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - Nils Haneklaus
- Td-Lab Sustainable Mineral Resources, Universität für Weiterbildung KremsKrems an der Donau, Austria
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Gao X, Yin H, Guo C, Yan B, Li M, Xin L, Wu Z. Comprehensive removal of various dyes by thiourea modified chitosan/nano ZnS composite via enhanced photocatalysis: Performance and mechanism. Int J Biol Macromol 2023; 247:125677. [PMID: 37406916 DOI: 10.1016/j.ijbiomac.2023.125677] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 06/28/2023] [Accepted: 07/01/2023] [Indexed: 07/07/2023]
Abstract
Dyeing wastewater is a carcinogenic pollutant, which is widely known for its harmful effects on humans and marine organisms. In this study, a novel composite was prepared by blending thiourea modified chitosan with zinc sulfide nanoparticles (T-CS/ZnS) to comprehensively remove methyl orange (MO), rhodamine B (Rh B), and methylene blue (MB) effectively. Characterization results suggested that the synthesized composite has an irregular and rough surface that provided high specific surface area for adsorption process, while the strong optical response and low bandgap width contributed to the subsequent photocatalytic degradation of adsorbed dye molecules. Under optimum experimental conditions, the removal rates of MO, Rh B, and MB were 99.59 %, 99.49 %, and 91.04 %, respectively. Amino and hydroxyl groups provide electrons in photocatalytic reactions. The reaction process is consistent with the quasi-first-order kinetic model, and the material has good stability and regeneration potential. This study indicated that T-CS/ZnS composite is a highly effective material for the treatment of dyeing wastewaters.
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Affiliation(s)
- Xiangpeng Gao
- Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China; School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Huiqing Yin
- Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China; School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Cheng Guo
- Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China; School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Boting Yan
- School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Mingyang Li
- School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Lili Xin
- Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China; School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China
| | - Zhaoyang Wu
- Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243032, China; School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243032, China.
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