Degradation of phenacetin by the UV/chlorine advanced oxidation process: Kinetics, pathways, and toxicity evaluation

Zhu, Yanping; Wu, Min; Gao, Naiyun; Chu, Wenhai; Li, Kai; Shi, Chen

doi:10.1016/j.cej.2017.10.070

Cited by 78 publications

(40 citation statements)

References 63 publications

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“…42,43 Adsorption cannot completely remove contaminants from the environment, and the catalytic process may introduce new chemicals into the water, which may cause new problems.…”

Section: -27mentioning

confidence: 99%

Aquatic photodegradation of clofibric acid under simulated sunlight irradiation: kinetics and mechanism analysis

et al. 2018

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a Clofibric acid is one of the most frequently detected pharmaceuticals in various aquatic environments.Photodegradation of clofibric acid in water under simulated sunlight was investigated. The effects of different initial concentrations, pH conditions and dissolved oxygen were examined. Photodegradation of clofibric acid followed a pseudo-first-order kinetics model, and the rate decreased gradually with the increasing initial concentration of clofibric acid. Dissolved oxygen inhibited the photodegradation of clofibric acid. As a result of varying reaction species of clofibric acid, the initial pH conditions greatly influenced its photodegradation. Quenching experiments showed that the self-sensitization process via $OH and

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“…42,43 Adsorption cannot completely remove contaminants from the environment, and the catalytic process may introduce new chemicals into the water, which may cause new problems.…”

Section: -27mentioning

confidence: 99%

Aquatic photodegradation of clofibric acid under simulated sunlight irradiation: kinetics and mechanism analysis

et al. 2018

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“…Among other toxicity tests a negative effect of UV/chlorine treatment was only reported in the luminescence inhibition test using a luminescent bacterium Q67 [54]. In this research the inhibition rate peaked at 10 min treatment and then decreased.…”

Section: Toxicitymentioning

confidence: 53%

“…benzalkonium chloride UV/chlorine 91% reduction by 2 h treatment lower than chlorination alone [53] luminescence inhibition (Q67) phenacetin UV/chlorine increase in inhibition (9 → 23%) by 20 min treatment, but lower than chlorination alone (45%) [54] respiration inhibition (Escherichia colli) 5,5-diphenylhydantoin UV/chlorine decrease to non-toxic level by 10 min treatment lower than chlorination alone [141] cytotoxicity (human hepatoma cells (Hep3B)) microcystin-LR UV/chlorine 7-37% increase in viability against UV or chlorination alone [142] Protein phosphatase inhibition assay microcystin-LR UV/chlorine 75.0% decrease for 10 min treatment [94] whole effluent toxicity (Ceriodaphnia dubia) trichloroethylene in groundwater UV/chlorine almost no toxicity [143] estrogenic activity (E-screen assay)…”

Section: Toxicitymentioning

confidence: 95%

“…Chlorinated organic compounds like halomethanes (HMs), haloacetic acids (HAAs), haloacetonitriles (HANs), haloketones (HKs), halonitoromethanes (HNMs), haloacetamides (HAAms), and chloral hydrate (CH) are well known DBPs by chlorination [49,50] and their formation in UV/chlorine AOPs is thereby apprehended. In fact some researchers reported that UV/chlorine AOPs produced trichloromethane (TCM) and chloroform (CF) in HMs, dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) in HAAs, dichloroacetonitrile (DCAN) and trichloroacetonitrile (TCAN) in HANs, dichloropropanone (DCP) and trichloropropanone (TCP) in HKs, chloronitoromethane (CNM), dichloronitoromethane (DCNM), and trichloronitromethane (TCNM) in HNMs, dichloroacetamide (DCAAm) and trichloroacetamide (TCAAm) in HAAms, and CH [20][21][22]37,47,[51][52][53][54][55]. Some comparative studies of UV/chlorine process with chlorination have been reported.…”

Section: Chlorinated Organic Compoundsmentioning

confidence: 99%

“…In synthetic water treatment, TCM and DCAA formation is constrained by UV/chorine treatment of carbamazepine, but TCAA, DCAN, and TCNM formation is enhanced [51]. An UV/chlorine AOP of phenacetin decreased total DBPs formation due to the reduction of TCM formation despite the enhanced formation of CH [54]. At post-chlorination stage, Lu et al reported that post-chlorination with a chlorine dose of 1.0 mM following UV/chlorine pre-treatment of 0.05 mM clofibric acid solution with a chlorine dose of 1.0 mM did not produce DCAN, TCAN, HNMs, chloromethane and dichloromethane, but increased TCM formation [57].…”

Section: Chlorinated Organic Compoundsmentioning

confidence: 99%

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State of the Art of UV/Chlorine Advanced Oxidation Processes: Their Mechanism, Byproducts Formation, Process Variation, and Applications

Kishimoto

2019

J. of Wat. & Envir. Tech.

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The photolysis of chlorine by ultraviolet radiation (UV/chlorine) produces HO˙ and Cl˙, part of which further transforms into reactive chlorine species (RCS) like Cl 2˙− and ClO˙. These radicals are responsible for the advanced oxidation effect of UV/chlorine processes. Recently, UV/chlorine processes gather much attention from researchers and practitioners and published papers on UV/chlorine processes have drastically increased, which were thoroughly reviewed in this paper for understanding the state of the art of these technologies. Fundamental studies elucidate that acidic conditions are favorable to UV/chlorine processes through a change in quantum yield of chlorine photolysis, equilibrium shifts of radical species, and a change in radical scavenger effect of free chlorine. Comparative studies reveal that UV/chlorine processes are usually more energy-efficient than UV/hydrogen peroxide and UV/ persulfate processes. Although unfavorable byproducts formation by RCS reactions is apprehended, application researches in real waters show that UV/chlorine processes do not enhance disinfection byproducts formation very much. Since UV irradiation and chlorination are widely used unit operations, a barrier to install an UV/chlorine process into a conventional process is not high. It is desired to develop and optimize a whole process combined with other unit processes for maximizing benefits in water treatment in the future. CONTENTS INFLUENTIAL FACTORSEffect of pH Effect of chlorine dose Effect of halide ion Effect of alkalinity Effect of natural organic matter (NOM) Effect of UV light source LP-UV/chlorine process MP-UV/chlorine process Excimer-UV/chlorine process UV-LED/chlorine process Solar/chlorine process Comparison with other UV-based AOPs PROCESS VARIATIONS

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Efficient Oxidation of Paracetamol Triggered by Molecular‐Oxygen Activation at β‐Cyclodextrin‐Modified Titanate Nanotubes

Zhou

Liu

et al. 2022

Chemistry An Asian Journal

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Titanate nanotubes (TNTs) were coated with a cyclic oligosaccharide (carboxymethyl-β-cyclodextrin, CM-β-CD) to obtain a photocatalyst (CM-β-CD-TNT) for efficiently activating molecular oxygen and removing the target contaminant. The hydrophobic cavity and the large specific surface area of the photocatalyst provide abundant active sites for activating molecular oxygen. The free radical capture experiment and quenching experiment showed that cyclodextrin could facilitate adsorption and activation of molecular oxygen to produce O 2 *À . Therefore, compared with the pristine TNT, CM-β-CD-TNT accelerated the oxidation efficiency of paracetamol (APAP) by 3.4 times. Moreover, the ring cleavage reaction induced by CM-β-CD-TNT effectively reduced the acute toxicity of wastewater containing APAP. Furthermore, 100% of bisphenol A (BPA), bisphenol S (BPS), phenol, 2,4dichlorophen (2,4-DCP), and carbamazepine (CBZ) were degraded by CM-β-CD-TNT after 2.5 h ultraviolet (UV) light irradiation. This strategy provides a new dimension for the advanced treatment of organic wastewater by organic macrocyclic molecule-modified materials.

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Degradation of phenacetin by the UV/chlorine advanced oxidation process: Kinetics, pathways, and toxicity evaluation

Cited by 78 publications

References 63 publications

Aquatic photodegradation of clofibric acid under simulated sunlight irradiation: kinetics and mechanism analysis

Aquatic photodegradation of clofibric acid under simulated sunlight irradiation: kinetics and mechanism analysis

State of the Art of UV/Chlorine Advanced Oxidation Processes: Their Mechanism, Byproducts Formation, Process Variation, and Applications

Efficient Oxidation of Paracetamol Triggered by Molecular‐Oxygen Activation at β‐Cyclodextrin‐Modified Titanate Nanotubes

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