Removal of mixed pesticides from drinking water system by photodegradation using suspended and immobilized TiO2.
11 Mar 2009-Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes (Taylor & Francis)-Vol. 44, Iss: 3, pp 262-270
TL;DR: During mixed pesticides degradation, the degradation pattern was not similar to that of single pesticide and there was not much change in the rates of degradation in both suspended and immobilized TiO2 systems irrespective of the pesticide.
Abstract: Lindane (1α, 2α, 3β, 4α, 5α, 6β-hexachloro cyclohexane), methyl parathion (O,O-dimethyl-O-4-nitrophenyl phosphorothioate) and dichlorvos (2,2-dichlorovinyl-O-O-dimethyl phosphate) are removed from water individually and as a mixture by photo degradation using suspended and immobilized forms of TiO2 (Degussa P-25). Studies were conducted to optimize the coating thickness of immobilized photo catalyst. The rate of degradation of pesticides was compared in both suspended and immobilized TiO2 systems. Degradation studies of mixed pesticides were carried out with low concentrations (1.0 and 2.5 mg/L) of pesticides. Only three intermediate byproducts such as methyl paraoxon, O,O,O-trimethyl phosphonic thionate and p-nitrophenol were observed during the methyl parathion degradation in suspended, immobilized TiO2 systems and mixed pesticides degradation studies. At the end of the reaction methyl parathion and its by-products were completely degraded. During lindane degradation hexachloro cyclohexane, pentachloro ...
Citations
More filters
TL;DR: It is evident from the literature survey that photocatalysis has good potential to remove a variety of organic pollutants, however, there is still a need to determine the practical utility of this technique on a commercial scale.
711 citations
Cites background from "Removal of mixed pesticides from dr..."
...Photocatalytic degradation of methyl parathion, dichlorvos and lindane in aqueous medium were investigated with suspended and immobilized system (Senthilnathan and Philip 2009)....
[...]
TL;DR: In this article, Nitrogen doped titanium photocatalysts with different nitrogen containing organic compounds were prepared by sol-gel method in acidic media and XRD and Raman spectrum showed that all peaks of N-doped TiO2 correspond to anatase crystalline structure.
225 citations
TL;DR: In this paper, fundamental and comprehensive assessments of the photocatalytic concepts and their applications for environmental remediation are reviewed, and the existing challenges and strategies to improve the photocATalytic efficiency are discussed.
Abstract: Heterogeneous photocatalysis is a promising technology especially for environmental remediation. Despite more than a decade of worldwide research in developing photocatalytic efficiency improving techniques, many questions regarding the large scale application of photocatalytic reactors still remain unanswered. Recently, improving the photocatalytic efficiency has gained scientific attention because it might lead to more economical and robust photocatalytic operation for environmental remediation. In this review, fundamental and comprehensive assessments of the photocatalytic concepts and their applications for environmental remediation are reviewed. The existing challenges and strategies to improve the photocatalytic efficiency are discussed. Further, recent developments and future research prospects on photocatalytic systems for environmental applications are also addressed.
205 citations
20 Jan 2016
TL;DR: In this paper, a review summarizes the recent research in the field of inorganic engineered nanoparticles development with direct or potential interest for drinking water treatment. But, despite early encouraging results, nanoparticles meet a number of limitations to get promoted and become part of large-scale water treatment plants.
Abstract: This review summarizes the recent research in the field of inorganic engineered nanoparticle development with direct or potential interest for drinking water treatment. The incorporation of engineered nanoparticles into drinking water treatment technologies against the removal of heavy metals, microorganisms and organic pollutants appears as a very dynamic branch of nanotechnology. Nanoparticles owe their potential to the high specific surface area and surface reactivity compared to conventional bulk materials. Depending on the mechanism of uptake, nanoparticles can be designed to establish high selectivity against specific pollutants and provide the required efficiency for application. However, despite early encouraging results, nanoparticles meet a number of limitations to get promoted and become part of large-scale water treatment plants. The most important is their availability in the required large quantities and their efficiency to fulfil the strict regulations for drinking water consumption and environmental safety. Both deal with the particle preparation cost and the cost of treatment operation with respect to the increase in supplied water price for the consumers. Under this view, this work attempts to evaluate reported studies according to their possibility to meet the reliable requirements of water technology and also suggests an experimental approach to allow validation of tested nanoparticles.
190 citations
02 Jan 2020
TL;DR: Pesticides and organic waste constitute a group of environmental pollutants that are widely distributed in our environment due to various human activities as discussed by the authors. Adsorptive removal and photocatalization can be used to remove these pollutants.
Abstract: Pesticides and organic waste constitute a group of environmental pollutants that are widely distributed in our environment due to various human activities. Adsorptive removal and photocatal...
165 citations
Cites methods from "Removal of mixed pesticides from dr..."
...Suspended and immobilized TiO2-based catalysts were used to remove various P-based pesticides including lindane, methyl parathion, quinalphos, diazinone, and dichlorovos from water bodies.([243-248]) Besides nonmetallic immobilization, immobilization of transition metals is effective in enhancement of TiO2 photocatalysis in visible light....
[...]