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 ...
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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)....
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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....
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References
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Journal Article•
TL;DR: The contamination of mineral water could be due to heavy contamination of groundwater, which is used for making mineral water.
Abstract: Forty-five soil samples of surface (0-15 cm) and subsurface (15-30 cm) soils from agricultural sites of Delhi, Haryana, Haridwar, Uttar Pradesh (UP) and around the hexachlorocyclohexane (HCH) manufacturing plant of IPL (Indian Pesticide Limited) and nine samples of different commercial brands of drinking water from markets in Delhi were analysed for the presence of residues of HCH isomers. Thirty-nine of the 45 soil samples contained residues of β-HCH (2.5 μg/kg to 463 mg/kg of soil) and the remaining showed the presence of γ-HCH (0.08 μg/kg to 43.00 mg/kg). Residues of α-HCH (0.04 μg/kg to 98.00 μg/kg of soil) and δ-HCH (0.07 μg/kg to 458.00 mg/kg of soil) were detected less frequently. All the nine samples of drinking water were found to contain residues of γ-HCH and β-HCH, whereas only 5 and 4 samples contained α- and δ-ΗCH respectively. Bisieri, Paras and V1P brands showed 99, 240 and 141 fold higher levels of HCH respectively when compared the EEC norms. The contamination of mineral water could be due to heavy contamination of groundwater, which is used for making mineral water.
86 citations
TL;DR: In this paper, the degradation of methyl parathion was investigated in the presence of nano-sized rutile titanium dioxide (TiO2) powders for the sonocatalytic degradation of an organophosphorus insecticide.
Abstract: Micron-sized and nano-sized rutile titanium dioxide (TiO2) powders were used as the catalysts for the sonocatalytic degradation of methyl parathion, an organophosphorus insecticide. The ultrasound of low power was used as an irradiation source to induce the catalytic activity of the rutile TiO2 particles. It was found that the degradation of methyl parathion sonocatalytically progressed more rapidly in the presence of TiO2 particles than only with ultrasonic irradiation in the absence of TiO2 catalyst. Moreover, the sonocatalytic activity of the micron-sized rutile TiO2 particles was obviously higher than that of nano-sized rutile TiO2 particles. The influences of reaction parameters, such as the species of TiO2 particles, methyl parathion concentration, TiO2 amount, pH value, ultrasonic intensity, ultrasonic frequency and temperature have been investigated and the optimal conditions for eliminating methyl parathion have been established. The processes of methyl parathion degradation have been monitored by high performance liquid chromatography (HPLC), ion chromatography and UV–vis spectra. The results showed that methyl parathion in aqueous solution was completely degraded to give simple inorganic ions, such as NO2−, NO3−, PO43−, SO42−, etc. The kinetics of the degradation of methyl parathion followed the first-order reaction. The degradation percentage of methyl parathion surpassed 95% within 80 min in the optimal experimental conditions.
66 citations
"Removal of mixed pesticides from dr..." refers result in this paper
...Similar results were reported by Wang et al.[8] while studying the photo degradation of various concentrations of methyl parathion....
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TL;DR: In this article, the authors used the HPLC-PDA-ESI-MS (high performance liquid chromatography-photodiode array-electrospray ionization-mass spectrometry) technique to identify and characterize the N-de-alkylation degradation of the Victoria Blue R (VBR) dye with UV irradiation.
55 citations
"Removal of mixed pesticides from dr..." refers background in this paper
...Hence, competitive adsorption of OH− for the same sites decreases, thus reducing the formation rate of OH radical, which is the principal oxidant necessary for a high degradation efficiency.[17] The reaction rates, k (min−1) of all the three pesticides with suspended TiO2 are given in Table 1....
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TL;DR: GC/MS identification of the intermediates produced during the photodegradation of Benzene revealed that doping lanthanum into TiO2 thin film favors a cleavage of benzene ring.
48 citations
"Removal of mixed pesticides from dr..." refers background in this paper
...Zhang et al.[20] reported that the photocatalytic activity of coated TiO2 films decreased after several cycles of photodecomposition process due to the coating of the intermediates on the surface of the films....
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TL;DR: In this article, the feasibility of photocatalytic degradation of organophosphoros pesticides using supported TiO2 as a catalyst was investigated using a 375 W medium pressure mercury lamp.
25 citations
"Removal of mixed pesticides from dr..." refers background in this paper
...Chenshifu et al.[15] studied the photocatalytic degradation of dichlorvos, monocrotophos, phorate and parathion using TiO2 supported on fiber glasses cloth as catalyst....
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