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Guo J, Gan W, Chen R, Zhang M, Sun Z. Au nanoparticle sensitized blue TiO 2 nanorod arrays for efficient Gatifloxacin photodegradation. RSC Adv 2023; 13:28299-28306. [PMID: 37767117 PMCID: PMC10521361 DOI: 10.1039/d3ra05552c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 09/20/2023] [Indexed: 09/29/2023] Open
Abstract
TiO2 nanorod arrays have been widely used in photocatalytic processes, but their poor visible light absorption and rapid carrier recombination limit their application. Both introducing oxygen vacancies and using precious metals as surface plasmon resonance (SPR) stimulators are effective strategies to enhance their photocatalytic performance. Herein, Au nanoparticle sensitized blue TiO2 nanorod arrays (Au/B-TiO2) were successfully fabricated for efficient Gatifloxacin photodegradation. The degradation efficiency of Gatifloxacin was up to 95.0%. Moreover, the corresponding reaction rate constant (Ka) was up to 0.02007 min-1. Additionally, it was suggested that Gatifloxacin could be subject to three different degradation pathways. The superior catalytic activity of Au/B-TiO2 is a result of the combined effect of the two components. Firstly, TiO2 nanorod arrays provide a larger surface area for Au deposition and act as efficient transfer channels. Secondly, the presence of oxygen vacancies in blue TiO2 nanorod arrays enhances the catalytic activity. Thirdly, Au acts as a SPR activator, providing a large number of high-energy electrons in the photocatalysis process. Lastly, the improved light capture capabilities are essential for efficient removal of Gatifloxacin. This work provides a new approach for the construction of a high-performance heterojunction photocatalyst in advanced oxidation processes.
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Affiliation(s)
- Jun Guo
- School of Electronic Engineering, Huainan Normal University Huainan 232038 P. R China
- School of Materials Science and Engineering, Anhui University Hefei 230601 P. R China
| | - Wei Gan
- School of Materials Science and Engineering, Anhui University Hefei 230601 P. R China
| | - Ruixin Chen
- School of Materials Science and Engineering, Anhui University Hefei 230601 P. R China
| | - Miao Zhang
- School of Materials Science and Engineering, Anhui University Hefei 230601 P. R China
| | - Zhaoqi Sun
- School of Materials Science and Engineering, Anhui University Hefei 230601 P. R China
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Zhao M, Yang M, Yang P, Su R, Xiao F, He P, Deng H, Zhang T, Jia B. One-step electrodeposition preparation of boron nitride and samarium co-modified Ti/PbO 2 anode with ultra-long lifetime: highly efficient degradation of lincomycin wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:97195-97208. [PMID: 37589843 DOI: 10.1007/s11356-023-28819-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 07/10/2023] [Indexed: 08/18/2023]
Abstract
Lincomycin (LC) is an extensively applied broad-spectrum antibiotic, and its considerable residues in wastewater have caused a series of environmental problems, which makes degradation of LC wastewater extremely urgent. In this work, we have constructed a novel boron nitride (BN) and samarium (Sm) co-modified Ti/PbO2 as anode for high-performance degradation of LC wastewater. Compared with Ti/PbO2, Ti/PbO2-Sm, and Ti/PbO2-BN electrodes, Ti/PbO2-BN-Sm electrode with smaller pyramidal particles possesses higher oxygen evolution potential (2.32 V), excellent accelerated service life (103 h), and outstanding electrocatalytic activity. The single-factor experiments demonstrate that under optimized conditions (current density of 20 mA.cm-2, 6.0 g L-1 Na2SO4, pH 9, and temperature of 30°C), removal rate and COD degradation rate of LC at 3 h have reached 92.85% and 89.11%, respectively. At the same time, degradation of LC is in accordance with the primary kinetic model. Based on the analysis of high-performance liquid chromatography-mass spectrometry (HPLC-MS), four possible degradation pathways are hypothesized. Therefore, efficient electrochemical degradation of LC by using an extremely long-life Ti/PbO2 electrode with high catalytic activity may be a promising method.
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Affiliation(s)
- Maojie Zhao
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Mengqi Yang
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Peilin Yang
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Rong Su
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Feng Xiao
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Ping He
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China.
- International Science and Technology Cooperation Laboratory of Micro-nanoparticle Application Research, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China.
| | - Hongquan Deng
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China.
| | - Tinghong Zhang
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
| | - Bin Jia
- International Science and Technology Cooperation Laboratory of Micro-nanoparticle Application Research, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
- Key Laboratory of Shock and Vibration of Engineering Materials and Structure of Sichuan Province, Southwest University of Science and Technology, Mianyang, 621010, People's Republic of China
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Liang E, Huang T, Li J, Wang T. Degradation pathways of atrazine by electrochemical oxidation at different current densities: Identifications from compound-specific isotope analysis and DFT calculation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023:121987. [PMID: 37301451 DOI: 10.1016/j.envpol.2023.121987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/16/2023] [Accepted: 06/07/2023] [Indexed: 06/12/2023]
Abstract
Current density was the key factor that impacted pollutant degradation by electrochemical oxidation, and reaction contributions at various current densities were non-negligible for the cost-effective treatments of organic pollutants. This research introduced compound specific isotope analysis (CSIA) into atrazine (ATZ) degradation by boron doped diamond (BDD) with current density of 2.5-20 mA/cm2, in order to provide "in-situ" and "fingerprint" analysis of reaction contributions with changed current densities. As results, the increased current density displayed a positive impact on ATZ removal. The ɅC/H values (correlations of Δδ13C and Δδ2H) were 24.58, 9.18 and 8.74 when current densities were 20, 4, and 2.5 mA/cm2, with ·OH contribution of 93.5%, 77.2% and 80.35%, respectively. While DET process favored lower current density with contribution rates up to ∼20%. What's more interesting, though the carbon and hydrogen isotope enrichment factors (εC and εH) were fluctuate, the ɅC/H linearly increased accompanied with applied current densities. Therefore, increasing current density was effective due to the larger ·OH contribution even though side reactions may occur. DFT calculations proved the increase of C-Cl bond length and the delocalization of Cl atom, confirming dechlorination reaction mainly occurred in the direct electron transfer process. While ·OH radical mainly attack the C-N bond on the side chain, which was more benefit to the fast decomposition of ATZ molecule and intermediates. It was forceful to discuss pollutant degradation mechanism by combining CSIA and DFT calculations. Target bond cleavage (i.e., dehalogenation reaction) can be conducted by changing reaction conditions like current density due to the significantly different isotope fractionation and bond cleavage.
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Affiliation(s)
- Enhang Liang
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Taobo Huang
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Jie Li
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Ting Wang
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China.
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