Kinetics and mechanism of sulfate radical- and hydroxyl radical-induced degradation of highly chlorinated pesticide lindane in UV/peroxymonosulfate system

Khan, Sanaullah; He, Xuexiang; Khan, Javed Ali; Khan, Hasan M.; Boccelli, Dominic L.; Dionysiou, Dionysios D.

doi:10.1016/j.cej.2016.05.150

Cited by 204 publications

(67 citation statements)

References 65 publications

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“…Research indicated that for chlordecone content of 0.1 lg/kg of soil there is no need to change cropping system, for higher values only low-uptake crops like banana, cabbage or papaya should be farmed as products like cucumber, lettuce or radish can exceed the norms of 20 lg/kg of fresh product. Considering lindane, the method developed by Khan et al (2016) to remove it from water seems most efficient, as it provides reasonable total organic carbon removal within hours. However, this method may be too expensive to be applied in poor regions, alike those proposed for PeCB degradation.…”

Section: Resultsmentioning

confidence: 99%

“…For lindane (and other isomers of HCH) one of the newest method is one employing iron (II) activated peroxymonosulfate. Once supported by UV radiation it provides nearly perfect decarbonisation and dechlorination (Khan et al 2015) due to strong role of SO 4 2-radical in slightly acidic environment (pH about 5.8) (Khan et al 2016). Other methods include photodegradation with photo-Fenton reaction (Nitoi et al 2013;Antonaraki et al 2010;Senthilnathan and Philip 2010) assuring total organic carbon removal within 2 h and some biodegradation processes including oxidation by fungi (Guillén-Jiménez et al 2012;Rigas et al 2010) or bacteria using it as a carbon source (Pesce and Wunderlin 2004;Saez et al 2012Saez et al , 2014.…”

Section: Degradation Of the Lindane Pentachlorobenzene And Keponementioning

confidence: 99%

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Lindane, kepone and pentachlorobenzene: chloropesticides banned by Stockholm convention

Madaj

Sobiecka

Kalinowska

2017

Int. J. Environ. Sci. Technol.

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Persistent organic pollutants are a serious problem to the environment due to their toxicity to both fauna and flora. Extremely resistant to biodegradation and prone to transfer through long distances via atmosphere can contaminate almost any place in the planet. They tend to bioaccumulate in fat tissue due to their lipophilicity and seriously affect poisoned organism's nervous, hepatic, reproductive or hormonal system. Since 2009, due to the Stockholm convention on persistent organic pollutants production and utilisation of certain halogenated pesticides has been prohibited. This group includes hexachlorocyclohexane, chlordecone (kepone) and pentachlorobenzene. All of these chloropesticides pose a serious threat to environment, and careful control of their production and release to the environment is required. This paper is a review of physical and chemical properties as well as sources in environment, impact on animal organisms, methods of degradation of most broadly used chlorinated persistent organic pollutants and suggestions concerning their utilisation.

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Section: Resultsmentioning

confidence: 99%

Section: Degradation Of the Lindane Pentachlorobenzene And Keponementioning

confidence: 99%

Lindane, kepone and pentachlorobenzene: chloropesticides banned by Stockholm convention

Madaj

Sobiecka

Kalinowska

2017

Int. J. Environ. Sci. Technol.

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“…The degradation of organic compounds usually takes place in several steps, involving the generation and destruction of various reaction by-products [49]. The various reaction by-products of lindane identified in the SSLA-TiO2/S2O8 2− /H2O2 process included hexachlorobenzene, tetrachlorocyclohexene, and dichlorophenol, probably resulting via hydrogen abstraction and hydroxylation pathways by using SO4 •− and • OH [20,31]. All of the generated by-products eventually disappeared after 6 h of irradiation.…”

Section: Characteristics Of Synthesized Tio2 Filmsmentioning

confidence: 99%

“…Several inorganic anions (e.g., CO 3 2− , HCO 3 − , NO 3 − , SO 4 2− , and Cl − ) and organic acids (e.g., humic acid (HA)) are frequently found in water sources, owing to the natural abundances and man-made activities [19]. Depending on the mode of the reaction, these inorganic and organic constituents in water may differently affect the removal efficiency of pollutants using different AOPs [20]. Only limited information is available about the effect of these constituents on the efficiency of combined photocatalytic-photochemical processes, so far.…”

Section: Introductionmentioning

confidence: 99%

Exhaustive Photocatalytic Lindane Degradation by Combined Simulated Solar Light-Activated Nanocrystalline TiO2 and Inorganic Oxidants

et al. 2019

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Organochlorine compounds (OCs) are very toxic, highly persistent, and ubiquitous contaminants in the environment. Degradation of lindane, a selected OC, by simulated solar light-activated TiO2 (SSLA-TiO2) photocatalysis was investigated. The film types of the TiO2 photocatalyst were prepared using a dip-coating method. The physical properties of the films were investigated using X-ray diffraction, transmission electron microscopy, and environmental scanning electron microscopy. The SSLA-TiO2 photocatalysis led to a lindane removal of 23% in 6 h, with 0.042 h−1 of an observed pseudo first-order rate constant (kobs). The SSLA-TiO2 photocatalysis efficiency was greatly enhanced by adding hydrogen peroxide (H2O2), persulfate (S2O82−), or both combined, corresponding to a 64%, 89%, and 99% lindane removal in the presence of 200 µM of H2O2, S2O82−, or equimolar H2O2-S2O82−, respectively. The hydroxyl and sulfate radicals mainly participated in lindane degradation, proven by the results of a radical scavenger study. The degradation kinetics were hindered in the presence of the water constituents, indicated by a 61%, 35%, 50%, 70%, 88%, and 91% degradation of lindane in 6 h, using a SSLA-TiO2/S2O82−/H2O2 photocatalysis system containing 1.0 mg L−1 humic acid (HA), or 1 mM of CO32−, HCO3−, NO3−, SO42−, and Cl−, respectively. The TiO2 film demonstrated high reusability during four runs of lindane decomposition experiments. The SSLA-TiO2/S2O82−/H2O2 photocatalysis is very effective for the elimination of a persistent OC, lindane, from a water environment.

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“…Therefore, monitoring the reaction intermediates is also essential for understanding and predicting the biocompatibility of treated wastewater by Fenton method. 46,47 Hence, it is of great signicance to understand the characteristics and mechanism of the degradation of 4M2NA by Fenton method.…”

Section: 38mentioning

confidence: 99%

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

et al. 2018

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Benzene dye intermediate (BDI) 4-methoxy-2-nitroaniline (4M2NA) wastewater has caused significant environmental concern due to its strong toxicity and potential carcinogenic effects. Reports concerning the degradation of 4M2NA by advanced oxidation process are limited. In this study, 4M2NA degradation by Fenton oxidation has been studied to obtain more insights into the reaction mechanism involved in the oxidation of 4M2NA. Results showed that when the 4M2NA (100 mg L À1) was completely decomposed, the TOC removal efficiency was only 30.70-31.54%, suggesting that some by-products highly recalcitrant to the Fenton oxidation were produced. UV-Vis spectra analysis based on Gauss peak fitting, HPLC analysis combined with two-dimensional correlation spectroscopy and GC-MS detection were carried out to clarify the degradation mechanism and pathway of 4M2NA. A total of nineteen reaction intermediates were identified and two possible degradation pathways were illustrated.Theoretical TOC calculated based on the concentration of oxalic acid, acetic acid, formic acid, and 4M2NA in the degradation process was nearly 94.41-97.11% of the measured TOC, indicating that the oxalic acid, acetic acid and formic acid were the main products. Finally, the predominant degradation pathway was proposed. These results could provide significant information to better understand the degradation mechanism of 4M2NA.

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Kinetics and mechanism of sulfate radical- and hydroxyl radical-induced degradation of highly chlorinated pesticide lindane in UV/peroxymonosulfate system

Cited by 204 publications

References 65 publications

Lindane, kepone and pentachlorobenzene: chloropesticides banned by Stockholm convention

Lindane, kepone and pentachlorobenzene: chloropesticides banned by Stockholm convention

Exhaustive Photocatalytic Lindane Degradation by Combined Simulated Solar Light-Activated Nanocrystalline TiO2 and Inorganic Oxidants

Study on the degradation mechanism and pathway of benzene dye intermediate 4-methoxy-2-nitroaniline via multiple methods in Fenton oxidation process

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