Heterogeneous photocatalysis of a dye solution using supported TiO2 nanoparticles combined with homogeneous photoelectrochemical process: Molecular degradation products

2011 ◽  
Author(s):  
A.R. Khataee ◽  
M. Zarei ◽  
R. Ordikhani-Seyedlar
Keyword(s):  
Tio2 Nanoparticles ◽  
Degradation Products ◽  
Heterogeneous Photocatalysis ◽  
Photoelectrochemical Process ◽  
Supported Tio2

Involvement of process parameters and various modes of application of TiO2 nanoparticles in heterogeneous photocatalysis of pharmaceutical wastes – a short review

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 57250-57266 ◽  
Author(s):  
Santanu Sarkar ◽  
Ranjana Das ◽  
Heechul Choi ◽  
Chiranjib Bhattacharjee
Keyword(s):  
Tio2 Nanoparticles ◽  
Organic Compounds ◽  
Process Parameters ◽  
Short Review ◽  
Heterogeneous Photocatalysis ◽  
Persistent Organic Compounds

In recent years, the occurrence of persistent organic compounds in industrial as well as municipal effluents is becoming a serious threat to the environment. The detrimental effects can be minimized with the help of photocatalysis.

scholarly journals Degradation of Ciprofloxacin by Titanium Dioxide (TiO2) Nanoparticles: Optimization of Conditions, Toxicity, and Degradation Pathway

2021 ◽  
Vol 16 (4) ◽  
pp. 752-762
Author(s):  
Mohammad Rofik Usman ◽  
Azmi Prasasti ◽  
Sovia Islamiah ◽  
Alfian Nur Firdaus ◽  
Ayu Wanda Marita ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Tio2 Nanoparticles ◽  
Degradation Product ◽  
Degradation Products ◽  
Degradation Pathway ◽  
Liquid Chromatography Mass Spectrometry ◽  
Uv Lamp ◽  
Escherichia Coli Bacteria ◽  
Open Access Article

The popular use of ciprofloxacin is often irrational, so it causes environmental pollution such as resistance. The solution to overcome environmental pollution due to ciprofloxacin is degradation by using TiO2 nanoparticles. TiO2 nanoparticles performance is influenced by environment such as light source, pH solvent, duration of lighting and TiO2 nanoparticles mass. The residual levels determination of ciprofloxacin was carried out by using a UV-Vis spectrophotometer. Toxicity test of ciprofloxacin degradation products with TiO2 nanoparticles used Escherichia coli bacteria. Liquid Chromatography Mass Spectrometry (LCMS) was used to determine the type of ciprofloxacin degradation product with TiO2 nanoparticles. The optimum condition for the ciprofloxacin degradation with TiO2 nanoparticles is lighting for 5 hours by using a white mercury UV lamp and 50 mg TiO2 nanoparticles with pH solvent of 5.5. The toxicity of ciprofloxacin degradation product with TiO2 nanoparticles was low. The smallest degradation product identified with m/z was p-fluoraniline (m/z 111). Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

scholarly journals Heterogeneous Photocatalysis of Metronidazole in Aquatic Samples

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7612
Author(s):  
Klaudia Stando ◽  
Patrycja Kasprzyk ◽  
Ewa Felis ◽  
Sylwia Bajkacz
Keyword(s):  
Degradation Products ◽  
Transformation Products ◽  
Heterogeneous Photocatalysis ◽  
Bond Breaking ◽  
Mass Ratio ◽  
Purification Method ◽  
Photocatalytic Removal ◽  
Catalyst Type ◽  
Mineralization Degree ◽  
High Degree

Metronidazole (MET) is a commonly detected contaminant in the environment. The compound is classified as poorly biodegradable and highly soluble in water. Heterogeneous photocatalysis is the most promoted water purification method due to the possibility of using sunlight and small amounts of a catalyst needed for the process. The aim of this study was to select conditions for photocatalytic removal of metronidazole from aquatic samples. The effect of catalyst type, mass, and irradiance intensity on the efficiency of metronidazole removal was determined. For this purpose, TiO2, ZnO, ZrO2, WO3, PbS, and their mixtures in a mass ratio of 1:1 were used. In this study, the transformation products formed were identified, and the mineralization degree of compound was determined. The efficiency of metronidazole removal depending on the type of catalyst was in the range of 50–95%. The highest MET conversion (95%) combined with a high degree of mineralization (70.3%) was obtained by using a mixture of 12.5 g TiO2–P25 + PbS (1:1; v/v) and running the process for 60 min at an irradiance of 1000 W m−2. Four MET degradation products were identified by untargeted analysis, formed by the rearrangement of the metronidazole and the C-C bond breaking.

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