Superior performance of ZnCoOx/peroxymonosulfate system for organic pollutants removal by enhancing singlet oxygen generation: The effect of oxygen vacancies

Zhao, Jujiao; Li, Fengchao; Wei, Haoxuan; Ai, Hainan; Gu, Li; Chen, Jia; Zhang, Lei; Chi, Minghui; Zhai, Jun

doi:10.1016/j.cej.2020.128150

Cited by 102 publications

(19 citation statements)

References 74 publications

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“…To confirm this, a quenching test was performed using t‐BuOH and l ‐histidine as radical scavenger. t‐BuOH has an outstanding capacity to scavenge ˙OH and the effective scavenger l ‐histidine was employed to capture 1 O 2 40 . As illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…S3.) compared with the NIST standard mass spectrometry database; an appropriate match of m/z values was obtained in addition to the number of atoms in the molecular formation 40 . Finally, four products were generated from AO7 [molecular weight (Mw) 350) and speculated as follows: 2‐naphthol (Mw 144), 4‐carboxylphenylglycine (Mw 195), cinnamic acid (Mw 148) and 1,10‐Decanediol (Mw 174), as listed in Table S5.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen peroxide enhanced sonophotocatalytic degradation of acid orange 7 in aqueous solution: optimization by Box–Behnken design

Wei

Rahaman²,

Zhao

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Sonophotocatalysis has gained great attention for research into practical applications to treat refractory organic dye from wastewater. However, its degradation efficiency needs to be improved further. To further enhance the sonophotocatalytic performance, here we report a novel hydrogen peroxide (H2O2)‐assisted titania (TiO2)‐based sonophotocatalyic system (H2O2‐US‐UV/TiO2) for degradation of acid orange 7 (AO7). RESULTS Effects of operating parameters including catalyst dosage, concentration of the oxidative agents and initial pH were analyzed through a response surface method coupled with Box–Behnken experimental design (RSM‐BBD) and experiments. Introducing H2O2 into the US‐UV/TiO2 system can significantly enhance AO7 removal. A quadratic model was proposed for predicting AO7 degradation using the RSM‐BBD method, and the statistical significance of the model was confirmed by ANOVA. The real AO7 removal efficiency (95.8%) under experimental conditions of 0.5 g L−1 TiO2, 4 mmol L–1 H2O2, and initial pH 3 was comparable with the predicated value (98.6%) obtained from this model. Quenching tests revealed that the hydroxyl radical (˙OH) was the key reactive species in the sonophotocatalytic system. Degradation products including 2‐naphthol, 4‐carboxylphenylglycine, cinnamic acid and 1,10‐Decanediol were identified. CONCLUSION Adding H2O2 improved the degradation performance of AO7 in the US‐UV/TiO2 system; H2O2 concentration was a more significant experimental factor than initial pH and TiO2 dosage. A degradation pathway of AO7 removal was suggested according to results of liquid chromatography‐mass spectrometry. The novel hybrid H2O2‐US‐UV/TiO2 system can be utilized as an efficient process for recalcitrant dye wastewater treatment. © 2021 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hydrogen peroxide enhanced sonophotocatalytic degradation of acid orange 7 in aqueous solution: optimization by Box–Behnken design

Wei

Rahaman²,

Zhao

et al. 2021

J of Chemical Tech & Biotech

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“…•radical is produced via peroxymonosulfate (PMS) activation with various activation methods, such as heat [23], UV [24,25], electro-activation [26], transition metal [27,28] and ultrasound [29]. The transition metal activation is usually used because of its low equipment requirements, low cost and more flexibility.…”

Section: Introductionmentioning

confidence: 99%

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

Wang

et al. 2022

Environ Sci Pollut Res

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Co-doped magnetic Mn 3 O 4 was synthesized by the solvothermal method and adopted as an effective catalyst for the degradation of oxytetracycline (OTC) in water.Synergistic interactions between Co-Mn 3 O 4 and Fe 3 O 4 not only resulted in the enhanced catalytic activity through the activation of peroxymonosulfate (PMS) to degrade OTC, but also made Fe 3 O 4 /Co-Mn 3 O 4 easy to be separated and recovered from aqueous solution. 94.2% of OTC could be degraded within 60 min at an initial OTC concentration of 10 mg/L, catalyst dosage of 0.2 g/L and PMS concentration of 10 mM, the high efficiency of which was achieved in a wider pH range of 3.0-10.0.The free radical quenching experiments showed that O 2•radicals and 1 O 2 played the main role in the degradation process. Co 3+ , Co 2+ , Fe 2+ , Fe 3+ , Mn 4+ , Mn 3+ and Mn 2+ on Fe 3 O 4 /Co-Mn 3 O 4 were identified as catalytic sites based on XPS analysis. Eventually, the intermediates of OTC degradation were examined and the possible decomposition pathways were proposed. The excellent catalytic performance of Fe 3 O 4 /Co-Mn 3 O 4 not 2 only came from the fact that the large specific surface area could provide abundant active sites for the activation of PMS, but also the charged redistribution among atoms to accelerate the reduction of metal ions. The high degradation efficiency of OTC in actual water samples indicated that Fe 3 O 4 /Co-Mn 3 O 4 had good potential for practical application.

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“…8 1 O 2 displays an excellent selectivity for organic syntheses and has been explored in the photocatalytic oxidation 9,10 and degradation of pollutants. 11,12 1 O 2 can be produced in conventional reactions or through photosensitization pathways, particularly by using dye photosensitizers that promote intersystem crossing from triplet to singlet states of 1 O 2 . The combination of hydrogen peroxide (H 2 O 2 ) and sodium hypochlorite is also a classic approach to the generation of singlet oxygen.…”

Section: Introductionmentioning

confidence: 99%

“…Singlet oxygen ( 1 O 2 ) has a higher energetic state where the spin electrons are paired, which is an important reactive oxygen species (ROS) with selectivity and reactivity higher than those of the 3 ∑ g ground state of O 2 , and degradation of pollutants. , 1 O 2 can be produced in conventional reactions or through photosensitization pathways, particularly by using dye photosensitizers that promote intersystem crossing from triplet to singlet states of 1 O 2 . The combination of hydrogen peroxide (H 2 O 2 ) and sodium hypochlorite is also a classic approach to the generation of singlet oxygen .…”

Section: Introductionmentioning

confidence: 99%

An Isopolymolybdate-Incorporated Metal–Organic Framework with Sulfite Oxidase-Mimicking Activity for Photocatalytic Oxidation of Sulfides Utilizing In Situ-Generated Singlet Oxygen

et al. 2021

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Developing new photocatalysts for sulfide oxidation utilizing in situ-generated 1 O 2 is very significant. Inspired by natural enzymatic processes, we synthesized a mimic sulfite oxidase (SO), {[Co(Mo 4 O 13 )(TPT) 2 ]} (CoMo-TPT), by incorporating an isopolymolybdate anion [Mo 4 O 13 ] 2− into a 2,4,6tri(4-pyridyl)-1,3,5-triazine (TPT)-based metal−organic framework under mild hydrothermal conditions. In this structure, {Mo 4 O 13 } units with intrinsic SO-like catalytic sites are beneficial for the selective oxidation of sulfite and thioether. The ultraviolet−visible spectra of CoMo-TPT exhibited strong absorption from 250 to 650 nm and potential application in the utilization of solar energy. Mott− Schottky measurements indicated that CoMo-TPT is an n-type semiconductor with a LUMO value of −0.70 V (vs NHE) and a HOMO value of 1.39 V. The transient photocurrent responses with strong current density cycles with visible light indicated CoMo-TPT has a high photochemical activity. The lower resistance indicated that CoMo-TPT has a higher efficiency of photoinduced electron and hole separation. CoMo-TPT displayed a high efficiency of 99% and a selectivity of 97.3% in photocatalytic oxidation of sulfides by utilizing in situ-generated 1 O 2 through a tandem process of formation of H 2 O 2 from O 2 followed by catalyzed disproportionation of H 2 O 2 .

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Superior performance of ZnCoOx/peroxymonosulfate system for organic pollutants removal by enhancing singlet oxygen generation: The effect of oxygen vacancies

Cited by 102 publications

References 74 publications

Hydrogen peroxide enhanced sonophotocatalytic degradation of acid orange 7 in aqueous solution: optimization by Box–Behnken design

Hydrogen peroxide enhanced sonophotocatalytic degradation of acid orange 7 in aqueous solution: optimization by Box–Behnken design

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

An Isopolymolybdate-Incorporated Metal–Organic Framework with Sulfite Oxidase-Mimicking Activity for Photocatalytic Oxidation of Sulfides Utilizing In Situ-Generated Singlet Oxygen

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