Rapid degradation of tetrabromobisphenol A under the UV/TiO2/KPS systems in alkaline aqueous solutions

Li, Qiang; Wang, Lifang; Zhang, Li; Xie, Huaqing

doi:10.1007/s11164-018-3641-4

Cited by 12 publications

(6 citation statements)

References 34 publications

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“…Further increasing the dosage of TiO 2 more than 100 mg/L, the photocatalytic efficiency decreased. The dosage of the addition increased the suspended particles in the solution, and greatly reduced the utilization of light, resulting in the partial catalyst not being fully activated during the photocatalysis, so the photocatalytic efficiency decreased [24,27]. In addition, the HBCD adsorbed on the catalysts in dark is less than 10%, so the free radical (OH • ) reaction dominates the rate of degradation reaction in the UV/TiO 2 system.…”

Section: Determination Of Tio 2 Dosagesmentioning

confidence: 99%

“…The UV/KPS system also relies on sulfate radicals (SO4 •− , S2O8 •− , etc.) excited by UV light to degrade pollutants [22,24]. In the UV/TiO2/KPS system, more free radicals were present and the free radical reaction is more complicated.…”

Section: Kinetic Analysis Of Different Reaction Systemsmentioning

confidence: 99%

“…In the UV/TiO2/KPS system, more free radicals were present and the free radical reaction is more complicated. S2O8 2− can be excited by photogenerated electrons on the surface of the catalyst to generate sulfate radicals (SO4 •− ), while SO4 •− can react with OHto produce OH • [21][22][23][24]. In the three systems, the degradation rates are all determined by the reactions between free radicals and contaminant molecules, while the intensity of the UV light (100 W) and the initial concentration (25.00 mg/L) of the contaminants in the three systems are all the same, so all reaction systems could be in line with pseudo-first-order kinetics.…”

Section: Kinetic Analysis Of Different Reaction Systemsmentioning

confidence: 99%

“…Measuring the concentration of bromide ion is a practical strategy to evaluate the amount of intermediates and the mineralization degree of HBCD [24]. Figure 4 shows the change of bromide ion concentration during the degradation of HBCD in the UV/TiO 2 /KPS system.…”

Section: The Mineralization Degree Of Hbcdmentioning

confidence: 99%

“…It's worthwhile to note that both the persulfate ion and sulfate radicals (SO 4 •− ) can be dissolved in water, so the free radicals and contaminants in water can be contracted at the molecular level, leading to a higher reaction rate. For instance, Li et al have found that addition of persulphate to UV/TiO 2 could improve the photocatalytic degradation of tetrabromobisphenol A and other pollutants [24][25][26]. Therefore, it is necessary to combine persulfate and UV/TiO 2 photocatalytic techniques to increase the mineralization of HBCD.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Effect of Photocatalytic Degradation of Hexabromocyclododecane in Water by UV/TiO2/persulfate

Wang

Fang³

et al. 2019

Catalysts

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In this work, the elimination of hexabromocyclododecane (HBCD) is explored by using photodegradation of the UV/TiO2 system, the UV/potassium persulfate (KPS) system, and the homo/heterogeneous UV/TiO2/KPS system. The experimental results show that the dosages of TiO2 and potassium persulfate have optimum values to increase the degradation degree. HBCD can be almost completely degraded and 74.3% of the total bromine content is achieved in the UV/TiO2/KPS homo/heterogeneous photocatalysis, much more than in the UV/persulfate system and the UV/TiO2 system. Roles of radicals SO4•− and OH• in the photocatalysis systems are discussed based on experimental measurements. The high yield of the concentration of bromide ions and decreased pH value indicates that synergistic effects exist in the UV/TiO2/KPS homo/heterogeneous photocatalysis, which can mineralize HBCD into inorganic small molecules like carboxylic acids, CO2 and H2O, thus much less intermediates are formed. The possible pathways of degradation of HBCD in the UV/TiO2/KPS system were also analyzed by GC/MS. This work will have practical application potential in the fields of pollution control and environmental management.

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Section: Determination Of Tio 2 Dosagesmentioning

confidence: 99%

Section: Kinetic Analysis Of Different Reaction Systemsmentioning

confidence: 99%

Section: Kinetic Analysis Of Different Reaction Systemsmentioning

confidence: 99%

Section: The Mineralization Degree Of Hbcdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic Effect of Photocatalytic Degradation of Hexabromocyclododecane in Water by UV/TiO2/persulfate

Wang

Fang³

et al. 2019

Catalysts

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Overview of the Mechanism of Degradation of Pharmaceuticals by Persulfate/Peroxysulfate Catalysts

Anjorin,

Alfred,

Sotunde

et al. 2024

ChemBioEng Reviews

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The leaching of pharmaceutical ingredients into water bodies poses an escalating threat, demanding urgent remediation strategies. Among several techniques advanced for their remediation, advanced oxidation methods utilizing persulfate (PS) and peroxymonosulfate (PMS) stand out as promising avenues for pharmaceutical degradation in wastewater. This article consolidates the research on photocatalytic degradation of pharmaceutical contaminants, focusing on PMS‐based photoactive composites, and elucidates their efficacy in removing active pharmaceutical ingredients from water. Moreover, it delineates alternative techniques for activating PS and PMS, providing a holistic understanding of the field's advancements. By outlining research limitations and knowledge gaps, this review underscores the imperative for further investigation and innovation in pharmaceutical wastewater treatment.

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Photogeneration of reactive oxygen species over ultrafine TiO2 particles functionalized with rutin–ligand induced sensitization and crystallization effects

et al. 2019

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Interaction of amorphous and crystalline TiO 2 ultrafine particles (2-6 nm) with rutin results in the formation of colored nanomaterials of an excellent dispersity and enhanced colloidal stability in aqueous media. The FTIR and Raman spectra confirmed attachment of the rutin ligand via vicinal hydroxyl groups in a catechol-like fashion. The binding of rutin to amorphous TiO 2 gives rise to spontaneous crystallization of the parent nanoparticles into hydrogen titanates (H 2 Ti 3 O 7 and H 2 Ti 12 O 25). Such structural transformations result in photosensitization toward visible light with enhanced efficiency of the charge separation and interfacial charge transfer processes, confirmed by detailed photoelectrochemical studies of the examined nanomaterials. The effectiveness of the photocatalytic ROS generation reactions was also strongly influenced by hydrogen peroxide, which plays a double role of a reactant prone to reduction and generation of hydroxyl radicals or a redox agent destroying the intra-band gap electronic states, suppressing thereby charge recombination. The photoinduced charge transfer processes lead to generation of various reactive oxygen species, which were detected by EPR using DMPO spin trap (HOO • detection) and in the reaction with terephthalic acid acting as a chemical scavenger (HO • detection). Complexation of TiO 2 particles with rutin shifts the photogeneration of hydroperoxyl (HOO •) and hydroxyl (HO •) radicals toward visible light (λ > 400 nm). A triple effect of rutin attachment to titania was established. It consists in pronounced photosensitization, promotion of crystallization and enhancement of the colloidal stability of ultrafine titania particles. Environmental implications of these assets on the photoinduced redox reactions with hydrogen peroxide in aqueous solutions upon UV or visible light irradiation were also discussed.

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Rapid degradation of tetrabromobisphenol A under the UV/TiO2/KPS systems in alkaline aqueous solutions

Cited by 12 publications

References 34 publications

Synergistic Effect of Photocatalytic Degradation of Hexabromocyclododecane in Water by UV/TiO2/persulfate

Synergistic Effect of Photocatalytic Degradation of Hexabromocyclododecane in Water by UV/TiO2/persulfate

Overview of the Mechanism of Degradation of Pharmaceuticals by Persulfate/Peroxysulfate Catalysts

Photogeneration of reactive oxygen species over ultrafine TiO2 particles functionalized with rutin–ligand induced sensitization and crystallization effects

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