1
|
Cai S, Wen Y, Zhang Q, Zeng Q, Yang Q, Gao B, Tang G, Zeng Q. Four-in-one multifunctional self-driven photoelectrocatalytic system for water purification: Organics degradation, U(VI) reduction, electricity generation and disinfection against bacteria. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 928:172353. [PMID: 38614351 DOI: 10.1016/j.scitotenv.2024.172353] [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: 12/22/2023] [Revised: 03/18/2024] [Accepted: 04/08/2024] [Indexed: 04/15/2024]
Abstract
This study addresses the energy-intensive nature of conventional wastewater treatment processes and proposes a solution through the development of a green, low-energy, and multifunctional wastewater treatment technology. The research focuses on a multifunctional self-driven photoelectrocatalytic (PEC) system, exploring its four-in-one applications in eliminating organic pollutants, reducing U(VI), generating electrical energy, and disinfecting pathogenic microorganisms. A TiO2-decorated carbon felt (CF@TiO2) cathode is synthesized to enhance interfacial charge transfer, with TiO2 coating improving surface binding sites (edge TiO and adsorbed -OH) for UO22+ adsorption and reduction. The self-driven PEC system, illuminated solely with simulated sunlight, exhibits remarkable efficiency in removing nearly 100 % of uranium within 0.5 h and simultaneously degrading 99.9 % of sulfamethoxazole (SMX) within 1.5 h, all while generating a maximum power output density (Pmax) of approximately 1065 μW·cm-2. The system demonstrates significant anti-interference properties across a wide pH range and coexisting ions. Moreover, 49.4 % of the fixed uranium on the cathode is reduced into U(IV) species, limiting its migration. The self-driven PEC system also excels in detoxifying various toxic organic compounds, including tetracycline, chlortetracycline, and oxytetracycline, and exhibits exceptional sterilization ability by disinfecting nearly 100 % of Escherichia coli within 0.5 h. This work presents an energy-saving, sustainable, and easily recyclable wastewater purification system with four-in-one capabilities, relying solely on sunlight for operation.
Collapse
Affiliation(s)
- Sixuan Cai
- School of Public Health, University of South China, Hengyang, Hunan 421001, China
| | - Yanjun Wen
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Qingyan Zhang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Qingming Zeng
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Qingqing Yang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Beibei Gao
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Guolong Tang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Qingyi Zeng
- School of Public Health, University of South China, Hengyang, Hunan 421001, China; School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, PR China.
| |
Collapse
|
2
|
Zhang F, Wu R, Zhang H, Ye Y, Chen Z, Zhang A. Novel Superhydrophobic Copper Mesh-Based Centrifugal Device for Edible Oil-Water Separation. ACS OMEGA 2024; 9:16303-16310. [PMID: 38617616 PMCID: PMC11007822 DOI: 10.1021/acsomega.3c10436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 02/25/2024] [Accepted: 02/29/2024] [Indexed: 04/16/2024]
Abstract
Edible oil is essential for people's daily life but also results in a large amount of oily wastewater simultaneously. Oil-water separation is a practical route that can not only purify wastewater but also recycle valuable edible oil. In this study, the superhydrophobic copper mesh (SCM) was prepared by chemical etching, and a novel oil-water centrifugal device was designed for high-efficiency separation of edible oil wastewater. The kernel is a self-prepared SCM, which has a water contact angle (WCA) of 155.1 ± 1.8° and an oil contact angle (OCA) of 0°. Besides, the separation performance of the SCM for edible oil-water mixtures was studied in this study. The results showed that the SCM exhibited excellent oil/water separation performance, with a separation efficiency of up to 96.7% for sunflower seed oil-water wastewater, 93.3% for corn oil-water wastewater, and 98.3% for peanut oil-water wastewater, respectively. Moreover, the separation efficiency was still over 90% after 18 cycles. A model was established to analyze the oil-water separation mechanism via centrifugation. The oil-water centrifugal separation device has great potential for scale-up applications.
Collapse
Affiliation(s)
- Fengzhen Zhang
- School
of Chemical Engineering, Sichuan University
of Science & Engineering, Zigong 643000, China
| | - Ranhao Wu
- School
of Chemical Engineering, Sichuan University
of Science & Engineering, Zigong 643000, China
| | - Huanhuan Zhang
- School
of Chemical Engineering, Sichuan University
of Science & Engineering, Zigong 643000, China
| | - Yuling Ye
- School
of Chemical Engineering, Sichuan University
of Science & Engineering, Zigong 643000, China
- National
Engineering Laboratory of Circular Economy, Sichuan University of Science and Engineering, Zigong 643000, China
- Sichuan
Engineering Technology Research Center for High Salt Wastewater Treatment
and Resource Utilization, Sichuan University
of Science and Engineering, Zigong 643000, China
| | - Zhong Chen
- Chongqing
Institute of Green and Intelligent Technology, Chinese Academy of
Sciences, Chongqing 400714, China
| | - Aiai Zhang
- School
of Chemical Engineering, Sichuan University
of Science & Engineering, Zigong 643000, China
| |
Collapse
|
3
|
Chen Y, Wang X, Zeng Z, Lv M, Wang K, Wang H, Tang X. Towards molecular understanding of surface and interface catalytic engineering in TiO 2/TiOF 2 nanosheets photocatalytic antibacterial under visible light irradiation. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133429. [PMID: 38232545 DOI: 10.1016/j.jhazmat.2024.133429] [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: 10/18/2023] [Revised: 12/20/2023] [Accepted: 01/01/2024] [Indexed: 01/19/2024]
Abstract
TiO2/TiOF2 Z-scheme nanosheets have been successfully synthesized for photocatalytic antibacterial. The antibacterial efficiency of TiO2/TiOF2 against E. coli and S. aureus were 99.90 % and 81.89 % at low material concentration (110 μg/mL), respectively, which are higher than those of pure TiO2, TiOF2, and Degussa P25. In situ molecular spectroscopy results demonstrate that the microstructure of the synthesized material can be reconstructed and optimized to enhance the exposure of the active sites·H2O and O2 are effectively adsorbed on the catalyst surface and activated to form OH…Ti and O…Ti surface active species. Furthermore, the dense interface formed in TiO2/TiOF2 acts as an efficient transport path for photoexcited electrons from TiO2 to TiOF2, and thus accelerates the formation of reactive oxygen species. Finally, the mechanism of bacterial inactivation is systematically discussed considering the main active substances, cell morphological changes, and activity of antioxidant enzymes.
Collapse
Affiliation(s)
- Yuanyuan Chen
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China
| | - Xilun Wang
- School of Chemistry, Sun Yat-sen University, Guangzhou 510275, Guangdong, PR China
| | - Ziruo Zeng
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China
| | - Meiru Lv
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China
| | - Kangfu Wang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China
| | - Hao Wang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China.
| | - Xiaoning Tang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, PR China.
| |
Collapse
|
4
|
He Y, Zan J, He Z, Bai X, Shuai C, Pan H. A Photochemically Active Cu 2O Nanoparticle Endows Scaffolds with Good Antibacterial Performance by Efficiently Generating Reactive Oxygen Species. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:452. [PMID: 38470782 DOI: 10.3390/nano14050452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 02/16/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024]
Abstract
Cuprous oxide (Cu2O) has great potential in photodynamic therapy for implant-associated infections due to its good biocompatibility and photoelectric properties. Nevertheless, the rapid recombination of electrons and holes weakens its photodynamic antibacterial effect. In this work, a new nanosystem (Cu2O@rGO) with excellent photodynamic performance was designed via the in situ growth of Cu2O on reduced graphene oxide (rGO). Specifically, rGO with lower Fermi levels served as an electron trap to capture photoexcited electrons from Cu2O, thereby promoting electron-hole separation. More importantly, the surface of rGO could quickly transfer electrons from Cu2O owing to its excellent conductivity, thus efficiently suppressing the recombination of electron-hole pairs. Subsequently, the Cu2O@rGO nanoparticle was introduced into poly-L-lactic acid (PLLA) powder to prepare PLLA/Cu2O@rGO porous scaffolds through selective laser sintering. Photochemical analysis showed that the photocurrent of Cu2O@rGO increased by about two times after the incorporation of GO nanosheets, thus enhancing the efficiency of photogenerated charge carriers and promoting electron-hole separation. Moreover, the ROS production of the PLLA/Cu2O@rGO scaffold was significantly increased by about two times as compared with that of the PLLA/Cu2O scaffold. The antibacterial results showed that PLLA/Cu2O@rGO possessed antibacterial rates of 83.7% and 81.3% against Escherichia coli and Staphylococcus aureus, respectively. In summary, this work provides an effective strategy for combating implant-related infections.
Collapse
Affiliation(s)
- Yushan He
- Hunan 3D Printing Engineering Research Center of Oral Care, Department of Periodontics, Xiangya Stomatological Hospital, Xiangya School of Stomatology, Central South University, Changsha 410008, China
| | - Jun Zan
- Institute of Additive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Zihui He
- Hunan 3D Printing Engineering Research Center of Oral Care, Department of Periodontics, Xiangya Stomatological Hospital, Xiangya School of Stomatology, Central South University, Changsha 410008, China
| | - Xinna Bai
- Hunan 3D Printing Engineering Research Center of Oral Care, Department of Conservative Dentistry and Endodontics, Xiangya Stomatological Hospital, Xiangya School of Stomatology, Central South University, Changsha 410008, China
| | - Cijun Shuai
- State Key Laboratory of Precision Manufacturing for Extreme Service Performance, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
- Shenzhen Institute of Information Technology, School of Sino-German Robotics, Shenzhen 518172, China
- College of Mechanical Engineering, Xinjiang University, Urumqi 830017, China
| | - Hao Pan
- Hunan 3D Printing Engineering Research Center of Oral Care, Department of Periodontics, Xiangya Stomatological Hospital, Xiangya School of Stomatology, Central South University, Changsha 410008, China
| |
Collapse
|
5
|
Tong Z, Liu Y, Wu X, Cheng Y, Yu J, Zhang X, Liu N, Liu X, Li H. Carbon Quantum Dots/Cu 2O Photocatalyst for Room Temperature Selective Oxidation of Benzyl Alcohol. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:212. [PMID: 38251175 PMCID: PMC10818315 DOI: 10.3390/nano14020212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 01/14/2024] [Accepted: 01/16/2024] [Indexed: 01/23/2024]
Abstract
The luminescence properties and excellent carrier transfer ability of carbon quantum dots (CQDs) have attracted much attention in the field of photocatalysis. In this work, we loaded the CQDs on the surface of Cu2O to enhance the visible-light property of Cu2O. Furthermore, the composite was used for selective oxidation of benzyl alcohol to benzaldehyde. The composite catalyst achieved high selectivity (90%) for benzaldehyde at room temperature, leveraging its visible-light-induced electron transfer properties and its photocatalytic activity for hydrogen peroxide decomposition. ·OH was shown to be the main reactive oxygen species in the selective oxidation reaction of benzyl alcohol. The formation of heterostructures of CQDs/Cu2O promoted charge carrier separation and provided a fast channel for photoinduced electron transfer. This novel material exhibited enhanced levels of activity and stability for selective oxidation of benzyl alcohol. Potential applications of carbon quantum dot composites in conventional alcohol oxidation reactions are shown.
Collapse
Affiliation(s)
- Zhuang Tong
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Yunliang Liu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Xin Wu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Yuanyuan Cheng
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Jingwen Yu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Xinyue Zhang
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Naiyun Liu
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| | - Xiang Liu
- Institute of Medicine & Chemical Engineering, Zhenjiang College, Zhenjiang 212028, China;
| | - Haitao Li
- Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China; (Z.T.); (Y.L.)
| |
Collapse
|