Mechanisim investigation on the enhanced and selective photoelectrochemical oxidation of atrazine on molecular imprinted mesoporous TiO2

Shi, Huijie; Wang, Yingling; Tang, Chunjing; Wang, Weikang; Liu, Meichuan; Zhao, Guohua

doi:10.1016/j.apcatb.2019.01.018

Cited by 60 publications

(20 citation statements)

References 39 publications

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“…These intermediates were probably generated by the attack of •OH [32][33][34] . Two feasible oxidation modes of •OH onto ATZ molecular existed in UV/H 2 O 2 system, (1) abstraction of hydrogen atom (P12, P14, P15, P16 and P21), (2) the hydroxylation attack (P14, P15, P17, P18, P19 and P20) 35,36 .…”

Section: Photooxidation Intermediates and Degradation Pathway In Uv/hmentioning

confidence: 99%

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Photooxidation of atrazine and its influence on disinfection byproducts formation during post-chlorination: effect of solution pH and mechanism

Liu

Zhu

et al. 2020

Sci Rep

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Partial photooxidation of micropollutants may lead to various degradation intermediates, obviously affecting disinfection byproducts (DBPs) formation during the post-chlorination process. The photooxidation of atrazine (ATZ) in aqueous solutions with low-pressure mercury UV lamps in UV, UV/H2O2 and UV/TiO2 treatment system and the formation of chlorinated disinfection byproducts (DBPs) during subsequent chlorination processes including dichloroacetic acid (DCAA), trichloroacetic acid (TCAA), 1,1,1-trichloro-2-propanone (TCP), trichloromethane (TCM) and chloropicrin (CHP) were investigated in this study. The effect of solution pH on the oxidation pathway of ATZ in three UV photooxidation treatment process and the impact of photooxidation on the DBPs formations were assessed. Based on UPLC-ESI–MS/MS analyses, identification of main oxidation intermediates was performed and the plausible degradation pathways of ATZ in photooxidation system were proposed, indicating that photooxidation of ATZ in UV/H2O2 and UV/TiO2 process system was significantly pH-dependent processes. Dichloroacetic acid (DCAA), trichloroacetic acid (TCAA), 1,1,1-trichloro-2-propanone (TCP), trichloromethane (TCM) and chloropicrin (CHP) were detected in photooxidized ATZ solutions. Compared to the other three DBPs, TCM and TCP were the main DBPs formed. The DBPs formations were greatly promoted in oxidized ATZ solutions. Solution pH and UV irradiation time exhibited obvious impact on the DBPs formation on the basis of DBP species. The variation tendency of DBPs observed relates to the combustion of ATZ in photooxidation system and the production oxidation intermediates.

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Section: Photooxidation Intermediates and Degradation Pathway In Uv/hmentioning

confidence: 99%

“…According to previous studies and the MS spectra, the molecular structures of P22-P26 were deduced 29,31,35 , as shown in Supplementary Table S13. Compared to UV and UV/H 2 O 2 process, five new photooxidation products of ATZ were identified during UV/TiO 2 oxidation.…”

Section: Photooxidation Intermediates and Degradation Pathway In Uv/hmentioning

confidence: 99%

Photooxidation of atrazine and its influence on disinfection byproducts formation during post-chlorination: effect of solution pH and mechanism

Liu

Zhu

et al. 2020

Sci Rep

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“…Therefore, characteristic removal of phenol in water is very important. At present, molecular imprinting technology is widely used to improve the characteristic removal of pollutants by catalysts. , Traditional molecularly imprinted (MI) materials are organic polymers obtained through the polymerization of selected functional monomers . The recognition mechanism relies on the interaction between the MI sites and the target molecular based on: hydrogen bonding or van der Waals interactions, electrostatic interactions, covalent bonding, covalent bond through spacer group, ligand–metal or metal–ligand coordination, etc.…”

Section: Introductionmentioning

confidence: 99%

Highly Characteristic Adsorption Based on Single Crystal {001}-TiO₂ Surface Molecular Recognition Promotes Enhanced Oxidation

Wei

Niu

Zhao

2020

ACS Appl. Mater. Interfaces

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Exploring the adsorption and selective removal mechanism of target pollutants on the catalytic interface is an important research topic in the field of environmental sewage treatment. However, the molecular recognition based on the surface of single crystals is still unclear. Single crystal molecularly imprinted TiO2 (001-MI-TiO2) with a highly exposed {001} plane was prepared by a hydrothermal method to characteristically adsorb and degrade phenol. The kinetics of phenol oxidation on 001-MI-TiO2 was 12.93 times that of polycrystal nonimprinted TiO2. The phenol adsorption quantity of 001-MI-TiO2 was 1.68 times that of the polycrystal molecularly imprinted TiO2 (MI-TiO2). Compared with MI-TiO2, the significantly increased removal of phenol on 001-MI-TiO2 mainly attributed to the enhanced adsorption quantity and better photocatalytic performance. The recognition mechanism of phenol on the 001-MI-TiO2 during the adsorption process was studied using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), which indicated enhanced adsorption of phenol when compared with MI-TiO2. The recognition between the phenol molecule and the imprinted sites mainly relied on the hydrogen bond between the π bond of the benzene ring and the hydroxyl group on the surface of TiO2. Besides, the interferent ATR-FTIR results showed that the single crystal surface can significantly reduce noncharacteristic adsorption, indicating good selectivity for the targets. In addition, the degradation intermediates during the photocatalytic process were further analyzed by in situ infrared technology.

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“…So far, there have been many techniques developed for treating polluted waters containing atrazine, including adsorption, microbial degradation, electro-catalysis, photocatalysis, and photoelectrocatalytic (PEC) oxidation method, etc. Among them, PEC technology has been given much attention owing to its high efficiency compared to the photocatalysis, environmental friendliness and utilization of solar energy .…”

Section: Introductionmentioning

confidence: 99%

“…Among them, PEC technology has been given much attention owing to its high efficiency compared to the photocatalysis, environmental friendliness and utilization of solar energy. 10 Especially the PEC oxidation method has been extensively investigated in the treatment of atrazine, 9 alky phenols, 11 bisphenol A, 12 etc. It is noted that in the PEC system, upon the radiation of light, both holes with oxidizing activity and electrons with reductive activity are generated.…”

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Photoelectrocatalytic Reduction and Removal of Atrazine: Effect of Co-Catalyst and Cathode Potential

Wang

Shi

et al. 2019

ACS Appl. Mater. Interfaces

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Photoelectrocatalytic (PEC) reduction and removal of atrazine, one typical endocrine disruptor chemical, was achieved on Pd quantum dots modified TiO 2 nanotubes (PdQDs@TiO 2 NTs) under regulating potentials. Compared with that on TiO 2 NTs, the PEC reduction efficiency of atrazine on PdQDs@TiO 2 NTs significantly increased, mainly attributed to the reduced electron transfer resistance, longer lifetime of the photogenerated electrons and the faster electron injection from the catalyst to atrazine in the solution. Meanwhile, PdQDs could also function as cocatalyst so that the electrocatalytic activity of PdQDs@TiO 2 NTs was evidently improved. Moreover, the investigation indicated that the applied potential not only played important role in accelerating the separation of photogenerated electrons and holes, but also with the increment of the cathodic potential, the PEC reduction mechanism of atrazine underwent the variation of electro-assisted photocatalysis, synergetic photoelectrocatalysis, and photoassisted electro-catalysis. A highest atrazine PEC reduction efficiency was achieved as 99.5% on PdQDs@ TiO 2 NTs in about 5 h under the potential of −1.3 V vs. SCE, whereas the highest synergetic effect of photo-and electrocatalysis was achieved at a lower potential of −0.9 V vs. SCE.

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Mechanisim investigation on the enhanced and selective photoelectrochemical oxidation of atrazine on molecular imprinted mesoporous TiO2

Cited by 60 publications

References 39 publications

Photooxidation of atrazine and its influence on disinfection byproducts formation during post-chlorination: effect of solution pH and mechanism

Photooxidation of atrazine and its influence on disinfection byproducts formation during post-chlorination: effect of solution pH and mechanism

Highly Characteristic Adsorption Based on Single Crystal {001}-TiO₂ Surface Molecular Recognition Promotes Enhanced Oxidation

Enhanced Photoelectrocatalytic Reduction and Removal of Atrazine: Effect of Co-Catalyst and Cathode Potential

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Mechanisim investigation on the enhanced and selective photoelectrochemical oxidation of atrazine on molecular imprinted mesoporous TiO2

Cited by 60 publications

References 39 publications

Photooxidation of atrazine and its influence on disinfection byproducts formation during post-chlorination: effect of solution pH and mechanism

Photooxidation of atrazine and its influence on disinfection byproducts formation during post-chlorination: effect of solution pH and mechanism

Highly Characteristic Adsorption Based on Single Crystal {001}-TiO2 Surface Molecular Recognition Promotes Enhanced Oxidation

Enhanced Photoelectrocatalytic Reduction and Removal of Atrazine: Effect of Co-Catalyst and Cathode Potential

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Highly Characteristic Adsorption Based on Single Crystal {001}-TiO₂ Surface Molecular Recognition Promotes Enhanced Oxidation