Photocatalytic degradation of Orange G on nitrogen-doped TiO2 catalysts under visible light and sunlight irradiation

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Performing your original search, photodegradation of atrazine by photo
Fenton, in PubMed will retrieve 4 records.
Huan Jing Ke Xue. 2012 Apr;33(4):1252-9.
[Study on the degradation of atrazine in
photo-Fenton-like system under visible
light irradiation promoted by N-doped
Ta2O5].
[Article in Chinese]
Zhao L, Deng YR, Du YX, Fu X.
Source
State Key Laboratory of Lake Science and Environment, Nanjing Institute of
Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
[email protected]
Abstract
In this study, N-doped Ta2O5 samples which have strong absorption in visible domain,
were prepared by the nitridation of Ta2O5 under NH4 flow and then added into photoFenton-like system to enhance Fe3+ reduction and atrazine degradation under visible
light irradiation. The sample prepared at 700 degrees C under a NH3 flow rate of 0.3 L
x min(-1) for 6 h showed the highest level of photocatalytic activity for Fe3+ reduction.
The influence of various operational parameters such as the light intensity, input of Ndoped Ta2O5, pH and initial concentrations of Fe3+, H2O2 and atrazine were
investigated. And the changesof H2O2 during the degradation were measured to explain
the effect of the operational parameters. The degradation ratio of atrazine reached 97%
after 60 min irradiation by 500 W Xe lamp under the conditions of pH = 2.6, [atrazine]0
= 18 mg x L(-1), [H2O2]0 = 2.5 mmol x L(-1), [Fe3+]0 = 0.5 mmol x L(-1) and the
input of N-doped Ta2O5 = 0.6 g x L(-1).
PMID:
22720574
[PubMed - in process]
J Hazard Mater. 2008 Jun 30;155(1-2):312-9. doi: 10.1016/j.jhazmat.2007.11.062. Epub
2007 Nov 23.
Photocatalytic degradation of Orange G
on nitrogen-doped TiO2 catalysts under
visible light and sunlight irradiation.
Sun J, Qiao L, Sun S, Wang G.
Source
Henan Key Laboratory for Environmental Pollution Control, Henan Normal University,
College of Chemistry and Environmental Science, No. 46, Jianshe Road, Xinxiang,
Henan Province 453007, PR China. [email protected]
Abstract
In this paper, the degradation of an azo dye Orange G (OG) on nitrogen-doped TiO2
photocatalysts has been investigated under visible light and sunlight irradiation. Under
visible light irradiation, the doped TiO2 nanocatalysts demonstrated higher activity than
the commercial Dugussa P25 TiO2, allowing more efficient utilization of solar light,
while under sunlight, P25 showed higher photocatalytic activity. According to the X-ray
diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis spectra
analyses, it was found that both the nanosized anatase structure and the appearance of
new absorption band in the visible region caused by nitrogen doping were responsible
for the significant enhancement of OG degradation under visible light. In addition, the
photosensitized oxidation mechanism originated from OG itself was also considered
contributing to the higher visible-light-induced degradation efficiency. The effect of the
initial pH of the solution and the dosage of hydrogen peroxide under different light
sources was also investigated. Under visible light and sunlight, the optimal solution pH
was both 2.0, while the optimal dosage of H2O2 was 5.0 and 15.0 mmol/l, respectively.
Water Sci Technol. 2012;66(10):2209-16. doi: 10.2166/wst.2012.439.
Quantum efficiencies of the photoFenton degradation of atrazine in water.
Benzaquén TB, Isla MA, Alfano OM.
Source
INTEC, UNL- CONICET, Santa Fe, Argentina.
Abstract
An experimental work in a well-stirred batch recycling reactor for the photo-Fenton
degradation of atrazine in water is presented. A study of the quantum efficiency is
performed to assess the effectiveness of the photo-Fenton process on the atrazine
degradation and total organic carbon (TOC) mineralization. Apparent and absolute
quantum efficiencies of degradation and mineralization of an atrazine-based commercial
herbicide are determined under different experimental conditions. Higher apparent
efficiencies were found for both atrazine degradation and TOC mineralization when the
ferric ion and hydrogen peroxide concentrations are increased. Because of the well
known stability of the triazine ring, atrazine was not completely mineralized by the
photo-Fenton process. However, a TOC reduction of 40% was achieved, being 62.5%
of the maximum value that can be reached.
Photo-Fenton degradation of alachlor, atrazine,
chlorfenvinphos, diuron, isoproturon and
pentachlorophenol at solar pilot plant
Int. Journal Environment and Pollution
Environment and Sustainable Development
Issue Volume 27, Number 1-3/2006
Pages 135-146
Subject Group . Energy and Environment
Online Date Tuesday, July 25, 2006
Authors
M.I. Maldonado Rubio, W. Gernjak, I. Oller Alberola, J. Blanco Galvez, P. Fernandez-Ibanez, S.
Rodriguez
1
Plataforma Solar de Almeria (CIEMAT), Carretera Senes, Km 4, Tabernas, Almeria
04200, Spain.
Abstract
Homogeneous photocatalysis by photo-Fenton processes has been applied to the degradation
of six water-soluble pesticides (alachlor, atrazine, chlorfenvinphos, diuron, isoproturon and
pentachlorophenol), considered priority substances by the European Union Water Framework
Directive (Directive 2000/60/EC). All tests were performed in a 35-L solar pilot plant with
compound parabolic collectors (CPCs) under natural sunlight. The initial concentration tested
for all the compounds was 50 mg/L except for those less soluble in water. Two different
concentrations of iron were tested, 2 mg/L and 1 mM. All pesticides were successfully
degraded and substantially mineralised. Total dechlorination was clearly attained more quickly
than 90% of mineralisation in all cases. Several operating parameters, treatment time,
hydrogen peroxide consumption and iron concentration, involved in the degradation of the
parent compounds and their mineralisation are discussed.
Keywords
advanced oxidation processes, pesticide degradation, iron, photocatalysis, photo-Fenton, solar
energy, wastewater treatment, alachlor, atrazine, chlorfenvinphos, diuron, isoproturon,
mineralisation, pentachlorophenol, water-soluble pesticides, dechlorination