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Jonidi Jafari A, Moslemzadeh M. The effect of TiO 2 nanoparticles on bacterial growth: the effect of particle size and their structure - a systematic review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2024; 34:697-707. [PMID: 36592384 DOI: 10.1080/09603123.2022.2163990] [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: 11/03/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
One of the widely used microbiological methods to determine the toxicity of chemicals, catalysts, and other types of materials is the minimum inhibitory concentration (MIC) test. The present study aims to investigate the influence of composition of composite materials based on TiO2 and their particle size as well as bacterial type and shape based on the MIC values reported in the literature. The results show that among the 36 articles selected, most of the studies used Escherichia coli (E. coli) (26) and Staphylococcus aureus (S. aureus) (19) bacteria to determine MIC values. This study revealed that the MIC in values below 70 µg ml-1 for S. aureus was lower than that for E. coli bacteria (below 200 µg ml-1). Importantly, MIC value decreased from 60.6 to 7.66 µg ml-1 with decrease in the size of nanoparticles. It follows from the increased surface area for smaller-sized particles, thus increased interaction with bacteria during MIC test.
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Affiliation(s)
- Ahmad Jonidi Jafari
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Mehrdad Moslemzadeh
- Department of Environmental Health Engineering, School of Public Health, Guilan University of Medical Sciences, Rasht, Iran
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Guo H, Cui J, Chai X, Shi Y, Gao S, Gao J. Preparation of multilayer strontium-doped TiO 2/CDs with enhanced photocatalytic efficiency for enrofloxacin removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:68403-68416. [PMID: 37121944 DOI: 10.1007/s11356-023-27338-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 04/26/2023] [Indexed: 05/27/2023]
Abstract
Multilayer strontium-doped TiO2/carbon dots (CDs) materials (TC) were produced via sol-gel-layered carbonization method. A thorough analysis of the fabricated composites via XRD, SEM, and XPS revealed that strontium ions, TiO2 and CDs, were combined with each other to form layered structures. According to the UV-Vis diffuse reflectance spectrograms and (αhv)1/2 vs. hv plots, the electron-donor property of strontium ions caused a more positive TC conduction band position than that in the pure TiO2, thereby increasing the visible-light absorption range of TC. Based on the photocatalytic degradation data, the degradation rate of enrofloxacin was 84.7% at the dosage of 0.05 g·L-1 and the concentration of 10 mg·L-1. The capture experiments and ESR results showed that ·O2- and e- played a major role in the degradation process of TC. The possible degradation mechanism of enrofloxacin was explained in terms of decarboxylation and defluorination, as was detected via ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) analysis.
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Affiliation(s)
- Huahua Guo
- Shanxi Key Laboratory of Advanced Carbon Based Electrode Materials, North University of China, Taiyuan, 030051, China
| | - Juan Cui
- Shanxi Key Laboratory of Advanced Carbon Based Electrode Materials, North University of China, Taiyuan, 030051, China
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Xu Chai
- Shanxi Key Laboratory of Advanced Carbon Based Electrode Materials, North University of China, Taiyuan, 030051, China
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Yilin Shi
- Shanxi Key Laboratory of Advanced Carbon Based Electrode Materials, North University of China, Taiyuan, 030051, China
| | - Shengwang Gao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Jianfeng Gao
- Shanxi Key Laboratory of Advanced Carbon Based Electrode Materials, North University of China, Taiyuan, 030051, China.
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Savchuk T, Gavrilin I, Konstantinova E, Dronov A, Volkov R, Borgardt N, Maniecki T, Gavrilov S, Zaitsev V. Anodic TiO 2nanotube arrays for photocatalytic CO 2conversion: comparative photocatalysis and EPR study. NANOTECHNOLOGY 2021; 33:055706. [PMID: 34670208 DOI: 10.1088/1361-6528/ac317e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
Titania (TiO2) is a widely used semiconductor for the photocatalytic decomposition of organic impurities in air, water and the conversion of CO2into hydrocarbon fuel precursors. TiO2in the form of nanotubes arrays is the most attractive for practical use because of the morphological advantages providing more favorable diffusion of photocatalytic reaction products and a low recombination rate of photogenerated electrons and holes. We have carried out a comparative study of the photocatalytic activity of gas-phase conversion of CO2to hydrocarbon products and the defect properties of multi-walled and single-walled arrays of TiO2nanotubes. Methanol and methane have been detected in the CO2photoreduction process. The photocatalytic evolution rate of multi-walled TiO2nanotubes is twice as fast for methane as for single-walled TiO2nanotubes after four hours of irradiation and four times faster for methanol. The type and features of the structural defects have been investigated by EPR spectroscopy. For the first time, it has been shown that Ti3+/oxygen vacancy centers are mainly located inside the outer layer of nanotubes, while carbon dangling bonds have been observed directly on the surface of the inner layer. Carbon defects have been found to be the centers of adsorption and accumulation of photoinduced charge carriers. The results are entirely new; they clarify the role of different types of defects in the photocatalytic conversion of CO2to hydrocarbon compounds and show good prospects for applying TiO2nanotube arrays.
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Affiliation(s)
- Timofey Savchuk
- National Research University of Electronic Technology-MIET, Bld. 1, Shokin Square, Zelenograd, Moscow 124498, Russia
- Lodz University of Technology, Institute of General and Ecological Chemistry, Zeromskiego 116, 90-924 Lodz, Poland
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
| | - Ilya Gavrilin
- National Research University of Electronic Technology-MIET, Bld. 1, Shokin Square, Zelenograd, Moscow 124498, Russia
| | - Elizaveta Konstantinova
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
| | - Alexey Dronov
- National Research University of Electronic Technology-MIET, Bld. 1, Shokin Square, Zelenograd, Moscow 124498, Russia
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
| | - Roman Volkov
- National Research University of Electronic Technology-MIET, Bld. 1, Shokin Square, Zelenograd, Moscow 124498, Russia
| | - Nickolay Borgardt
- National Research University of Electronic Technology-MIET, Bld. 1, Shokin Square, Zelenograd, Moscow 124498, Russia
| | - Tomasz Maniecki
- Lodz University of Technology, Institute of General and Ecological Chemistry, Zeromskiego 116, 90-924 Lodz, Poland
| | - Sergey Gavrilov
- National Research University of Electronic Technology-MIET, Bld. 1, Shokin Square, Zelenograd, Moscow 124498, Russia
| | - Vladimir Zaitsev
- Physics Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
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