Formation of halogenated organic byproducts during medium-pressure UV and chlorine coexposure of model compounds, NOM and bromide

Zhao, Quan; Shang, Chii; Zhang, Xiangru; Ding, Guoyu; Yang, Xin

doi:10.1016/j.watres.2011.09.053

Cited by 80 publications

(48 citation statements)

References 34 publications

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“…The h vb þ may easily affect the oxidation of O-functional groups, while e aq À promotes the formation of of CeCl. Meanwhile, photolysis of aqueous Cl 2 occurs when irradiated at wavelengths below 511 nm to form chlorine radicals ( ) and hydroxyl radicals ( ) as shown in Equation (1) (Carri on et al, 1972;Nowell and Hoign e, 1992;Cataldo, 1994;Wang et al, 2012a;Zhao et al, 2011):…”

Section: Mechanisms Controlling Go Transformation By Photochlorinationmentioning

confidence: 99%

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Adeleye

Keller

et al. 2017

Water Research

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a b s t r a c tWith the increasing production and wide utilization of graphene oxide (GO), the nanomaterials are expected to be released into the environment, and end up in surface waters, and/or wastewater treatment plants. This study explored the changes in the physicochemical properties of GO resulting from photochlorinationd simulating the reactions that occur during water and wastewater treatment. Photochlorination resulted in significant changes in the surface oxygen-functionalities of the nanomaterials, and fragmenting of the graphenic carbon sheets was observed. We found that photochlorination can enhance the decomposition of GO through the formation of reduced GO. The changes in surface oxygenfunctionalities of GO were attributed to the oxidation by chlorine of the nanomaterials' quinone groups, and further oxidation by and/or radicals. The surface charge of GO, measured by its zeta potential, increased in magnitude with chlorination but decreased in magnitude with photochlorination, leading to the decrease in the colloidal stability of the photochlorinated nanomaterials. The antibacterial effect of the nanomaterials increased with both chlorination and photochlorination. This study clearly shows how the physicochemical properties, and environmental fate and effect of GO are modified by photochlorination.

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Section: Mechanisms Controlling Go Transformation By Photochlorinationmentioning

confidence: 99%

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Adeleye

Keller

et al. 2017

Water Research

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“…It has been investigated in laboratory studies to treat contaminants such as para-chlorobenzoic acid, benzoic acid, nitrobenzene, phenol, maleic acid, and trichloroethylene Jin et al, 2011;Fang et al, 2014;Zhao et al, 2011;Wang et al, 2012), emerging contaminants in drinking water (Sichel et al, 2011), and naphthenic acids and fluorophore organic compounds in oil sands wastewater (Chan et al, 2012;Shu et al, 2014). For a drinking water treatment plant, operations could be relatively simple and cost-effective compared to the UV/H 2 O 2 process, especially if the chlorine dose is selected to provide adequate photolysis for the control of taste and odour compounds, with remaining chlorine serving as a secondary disinfectant (Watts et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

UV/chlorine control of drinking water taste and odour at pilot and full-scale

Wang

Bolton²,

Andrews

et al. 2015

Chemosphere

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“…This phenomenon can be explained by the formation of HO· during the UV-chlorine process, and HO· is known to readily react with DBP precursors in water through either hydrogen abstraction from the C-H bond or addition to the C=C bond and C=O bond, which are conjugated with aromatic rings [38]. After HO· exposure, precursors that carry electron-donating groups generated products that were much more reactive toward electrophilic halogenation [39], leading to more DBP formation.…”

Section: Dbp Formationmentioning

confidence: 99%

“…Water 2019, 11, 2639 8 of 11 C-H bond or addition to the C=C bond and C=O bond, which are conjugated with aromatic rings [38]. After HO· exposure, precursors that carry electron-donating groups generated products that were much more reactive toward electrophilic halogenation [39], leading to more DBP formation. Figure 5 shows the HepG2 cell death percentage according to MTT assay.…”

Section: Dbp Formationmentioning

confidence: 99%

Degradation of Micropollutants by UV–Chlorine Treatment in Reclaimed Water: pH Effects, Formation of Disinfectant Byproducts, and Toxicity Assay

Wang

Ying

Минг

et al. 2019

Water

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The utilization of reclaimed water is a reliable and sustainable approach to enhance water supply in water-deficient cities. However, the presence of micro-organic pollutants (MPs) in reclaimed water has potential adverse effects on aquatic ecosystems and human health. In this study, we investigated the occurrence of 12 target MPs in the influent and reclaimed water collected from a local wastewater treatment plant, and the ultraviolet (UV)-chlorine process was applied to analyze its ability to remove MPs. The results showed that all 12 MPs were detected in both the influent and the reclaimed water, with the concentrations ranging from 25.5 to 238 ng/L and 8.6 to 42.5 ng/L, respectively. Over 52% of all the target MPs were readily degraded by the UV-chlorine process, and the removal efficiency was 7.7% to 64.2% higher than the corresponding removal efficiency by chlorination or UV irradiation only. The degradation efficiency increased with the increasing initial chlorine concentration. The pH value had a slight influence on the MP degradation and exhibited different trends for different MPs. The formation of known disinfectant byproducts (DBPs) during the UV-chlorine process was 33.8% to 68.4% of that in the chlorination process, but the DBPs' formation potentials were 1.3 to 2.2 times higher. The toxicity assay indicated that UV-chlorine can effectively reduce the toxicity of reclaimed water.

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Formation of halogenated organic byproducts during medium-pressure UV and chlorine coexposure of model compounds, NOM and bromide

Cited by 80 publications

References 34 publications

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

Photochlorination-induced transformation of graphene oxide: Mechanism and environmental fate

UV/chlorine control of drinking water taste and odour at pilot and full-scale

Degradation of Micropollutants by UV–Chlorine Treatment in Reclaimed Water: pH Effects, Formation of Disinfectant Byproducts, and Toxicity Assay

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