Enhanced photocatalytic NO removal and toxic NO2 production inhibition over ZIF-8-derived ZnO nanoparticles with controllable amount of oxygen vacancies

Zhu, Pengfei; Yin, Xiaohe; Gao, Xinhua; Dong, Guohui; Xu, Jingkun; Wang, Chuanyi

doi:10.1016/s1872-2067(20)63592-6

Cited by 90 publications

(20 citation statements)

References 52 publications

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“…The increase can be attributed to electrons provided by the PFRs from biochar and the excited electrons from surface loaded H 2 -TiO 2 . Once the electrons were excited by the incident irradiation, they were rapidly transferred to the back-contacted ITO electrode via graphitized HSCB . Therefore, higher photocurrent density and more efficient production of ROS could be achieved simultaneously, and the degradation ability of the composite would be increased.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Durable Biochar/H₂-TiO₂ for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

et al. 2022

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Widespread application of TiO 2 for degradation of antibiotics is restricted by mainly the low photodegradation efficiency under solar irradiation. To expand the application of TiO 2 , the key factors that should be improved are visible-light response, yield of electrons and holes, and durability. Herein, we report a visible-light responsive and durable sugarcane-bagasse-derived biochar supported hydrogenated TiO 2 (HSCB/H 2 -TiO 2 ) photocatalyst with higher electron production fabricated by a facile one-pot hydrogenation. Mild hydrogenation temperature preserved the lotus-stem-like structure of sugarcane bagasse and gave the photocatalyst great separability. The superior durability of HSCB/H 2 -TiO 2 was demonstrated by 12 rounds of repeated degradation of methylene blue (MB). In addition, the electron paramagnetic resonance (EPR) results demonstrated that the biochar skeleton contains abundant persistent free radicals (PFRs), which can provide excess electrons to form more • O 2 – . Meanwhile, radical quenching experiment and EPR radical trapping results also revealed that • O 2 – was the most dominant species for enrofloxacin (ENR) degradation. Thus, the as-fabricated photocatalyst shows excellent solar-driven degradation of ENR, and 95.6% of ENR was degraded in 180 min under simulated solar irradiation. Possible ENR degradation pathways and mechanism are also proposed based on the identified intermediates.

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Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Durable Biochar/H₂-TiO₂ for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

et al. 2022

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“…Zhu et al found that the excellent properties can be attributed to the contribution of oxygen vacancies in the two-step calcination samples to their photocatalytic properties. Electrons confined by oxygen vacancies can be transferred to O −2 to produce superoxide radicals, which can oxidize NO to the final product nitrate [ 18 ]. Zhang et al found that the abundant oxygen vacancy, high specific surface area, and interfacial interaction between CeO 2 and ZnO effectively amplified the resistance changes caused by oxygen adsorption changes.…”

Section: Introductionmentioning

confidence: 99%

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

Zhang

2022

Nanomaterials

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In this paper, ZnO/NiO composites rich in oxygen vacancies are prepared by the solvothermal method and reduction method. In the test, through the use of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM), diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and electron paramagnetic resonance (EPR), we effectively prove the existence of phase, morphology and oxygen vacancies in the material. Through the photocatalysis test and gas sensitivity test, it is found that 10% Ni doped OZN-10 has the best photocatalytic activity and gas sensitivity characteristics. The degradation rate of methylene blue (MB) was 98%. The gas sensitivity test shows that OZN-10 has good selectivity, good response performance (3000 ppm, 27,887%) and excellent response recovery time (response time: 50 s, recovery time: 5–7 s) for saturated NH3 gas at standard atmospheric pressure (101.325 KPa) and room temperature (25 °C). The synergistic effect of oxygen vacancy as the center of a trap and p–n heterojunction forming an electric potential field at the interface is explained, and the mechanism of improving photocatalysis and gas sensitivity is analyzed. This work will provide an innovative vision for dual-performance oxygen vacancy modification of heterojunctions through photocatalysis.

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“…The well-known photocatalysts such as zinc oxide (ZnO) and titanium dioxide (TiO 2 ) are used for removal or degradation of pollutants from wastewater because of their impressive oxidizing potential, costeffectiveness, chemical inertness, non-toxicity, and stability towards photocatalysis (Bhanvase et al, 2014). ZnO is found to have favorable band edge positions and high catalytic efficiency (Zhu et al, 2020). At the same time, both ZnO and TiO 2 have low cost and are environmentally sustainable (Bethi et al, 2019;Sonawane et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Anatase TiO 2 has a band gap energy equivalent to 3.2 eV (Bhanvase et al, 2017), whereas ZnO has a band gap of 3.37 eV (Liu, Fang, et al, 2012). Despite superior properties, the photocatalytic efficiency of both these components is low due to quick recombination of the photo-generated electron hole pairs, low photo-sensitivity span, wide band gap, and poor visible light absorption properties (Zhu et al, 2020). However, the proficiency of these materials can be certainly improved by a number of techniques such as incorporation of electron accepting materials, loading of noble metal, and doping of metal ion.…”

Section: Introductionmentioning

confidence: 99%

A review of graphene‐TiO₂ and graphene‐ZnO nanocomposite photocatalysts for wastewater treatment

Thakre

Barai

Bhanvase

2021

Water Environment Research

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Technologies for wastewater remediation have been growing ever since the environmental and health concern is realized. Development of nanomaterials has enabled mankind to have different methods to treat the various kinds of inorganic and organic pollutants present in wastewater from many resources.Among the many materials, semiconductor materials have found many environmental applications due to their outstanding photocatalytic activities. TiO 2 and ZnO are more effectively used as photocatalyst or adsorbents in the withdrawal of inorganic as well as organic wastes from the wastewater. On the other hand, graphene is tremendously being investigated for applications in environmental remediation in view of the superior physical, optical, thermal, and electronic properties of graphene nanocomposites. In this work, graphene-TiO 2 and graphene-ZnO nanocomposites have been reviewed for photocatalytic wastewater treatment. The various preparation techniques of these nanocomposites have been discussed. Also, different design strategies for graphene-based photocatalyst have been revealed. These nanocomposites exhibit promising applications in most of the water purification processes which are reviewed in this work. Along with this, the development of these nanocomposites using biomass-derived graphene has also been introduced. Practitioner Points• Graphene-TiO 2 and graphene-ZnO nanocomposites are effective for wastewater treatment through photocatalysis.• These nanocomposite photocatalysts have been used in the form of membrane as well as antibacterial agents.• Synthetic strategies and design considerations of graphene-based photocatalyst play a major role.• Biomass-derived graphene-TiO 2 and graphene-ZnO nanocomposites have also found application in wastewater treatment.

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Enhanced photocatalytic NO removal and toxic NO2 production inhibition over ZIF-8-derived ZnO nanoparticles with controllable amount of oxygen vacancies

Cited by 90 publications

References 52 publications

Facile Fabrication of Durable Biochar/H₂-TiO₂ for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

Facile Fabrication of Durable Biochar/H₂-TiO₂ for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

A review of graphene‐TiO₂ and graphene‐ZnO nanocomposite photocatalysts for wastewater treatment

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Enhanced photocatalytic NO removal and toxic NO2 production inhibition over ZIF-8-derived ZnO nanoparticles with controllable amount of oxygen vacancies

Cited by 90 publications

References 52 publications

Facile Fabrication of Durable Biochar/H2-TiO2 for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

Facile Fabrication of Durable Biochar/H2-TiO2 for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

The Oxygen Vacancy Defect of ZnO/NiO Nanomaterials Improves Photocatalytic Performance and Ammonia Sensing Performance

A review of graphene‐TiO2 and graphene‐ZnO nanocomposite photocatalysts for wastewater treatment

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Facile Fabrication of Durable Biochar/H₂-TiO₂ for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

Facile Fabrication of Durable Biochar/H₂-TiO₂ for Highly Efficient Solar-Driven Degradation of Enrofloxacin: Properties, Degradation Pathways, and Mechanism

A review of graphene‐TiO₂ and graphene‐ZnO nanocomposite photocatalysts for wastewater treatment