Simultaneous removal of tetracycline and Cr(VI) by a novel three-dimensional AgI/BiVO4 p-n junction photocatalyst and insight into the photocatalytic mechanism

Zhao, Wei; Li, Jing; Dai, Benlin; Cheng, Zhipeng; Xu, Jia‐Zhuang; Ma, Kang; Zhang, Lili; Sheng, Ning; Mao, Guangxiu; Wu, Hong‐Wei; Wei, Kexia; Leung, Dennis Y.C.

doi:10.1016/j.cej.2019.03.115

Cited by 162 publications

(36 citation statements)

References 58 publications

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“…In addition, simultaneous photocatalytic degradation of organic pollutants and heavy metals, particularly hexavalent chromium, has gained significant interest among researchers. Some studies reported that the simultaneous photocatalysis method has shown an increasing in the photocatalytic performance compared to the commercial photocatalysis approach (Zhao et al 2019). The increasing in the photocatalytic performance of both organic and heavy metal removal may be explained by the synergistic interaction that is present in the system which suppressed the recombination of electron-hole pairs along with increasing the number of excited electrons (Wang et al 2021).…”

Section: Photocatalysismentioning

confidence: 99%

“…In addition, as reported by some previous studies, a significant trace amount of highly toxic heavy metals such as cadmium, nickel, chromium, and lead is also detected in some industrial wastewaters such as electroplating, pharmaceutical, and plastic industries (Xu et al 2017). The existence of these heavy metals, especially hexavalent chromium in the natural environment, makes the situation worse due to the fact that some of the organic pollutants, such as tetracycline, an antibiotic organic pollutant, are capable of reacting with the hexavalent chromium, forming a complex and highly stable compound, which is required advance technologies for the treatment (Zhao et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous remediation of hexavalent chromium and organic pollutants in wastewater using period 4 transition metal oxide-based photocatalysts: a review

et al. 2021

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The contamination by hexavalent chromium and organic pollutants is a serious health issue. Moreover, hexavalent chromium can react with organic pollutants to form a complex which is difficult to treat, and thus remains in the natural environment for long times. Simultaneous photocatalysis can remove both organic pollutants and hexavalent chromium. Here we review the use of period 4 metal oxide-based photocatalysts for the removal of organic pollutants and hexavalent chromium. Titanium dioxide exhibited the highest performance, up to 100%, in removing both hexavalent chromium and organic pollutants from water. KeywordsTransition metal oxide • Period 4 • Simultaneous redox • Hexavalent chromium • Organic pollutants • Photocatalysis Abbreviations PAN/TiO 2 /Ag Modified polyacrylonitrile by silverdoped titanium dioxide TiO 2 /BiOCl Titanium dioxide supported by bismuth oxychloride A/R-TiO 2 Anatase/rutile titanium dioxide A/R-TiO 2 /BiOI Anatase-/rutile titanium dioxidesupported bismuth oxyiodide NM/TiO 2 Natural melanin-supported titanium dioxide Cr(VI)/MO Hexavalent chromium/methyl orange system * A. A. Jalil

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Section: Photocatalysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous remediation of hexavalent chromium and organic pollutants in wastewater using period 4 transition metal oxide-based photocatalysts: a review

et al. 2021

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“…6e). This is because MoS 2 forms a p-n junction with CdS, which lengthens the lifetime of the charge [56,57]. Under visible light irradiation, the Zscheme CdS@MoS 2 catalyst produced electron-hole pairs.…”

Section: Science China Materialsmentioning

confidence: 99%

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

Zhao

Yan

et al. 2020

Sci. China Mater.

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Photocatalytic hydrogen production coupled with selective oxidation of organic substrates to produce highvalue-added fine chemicals has drawn increasing attention. Herein, we report a noble metal-free photocatalyst for the highly efficient and simultaneous generation of hydrogen and the selective oxidation of benzyl alcohol into benzaldehyde over CdS@MoS 2 heterostructures under visible light. Without the need for a sacrificial agent, CdS@MoS 2 displayed an excellent hydrogen production rate of 4233 μmol g −1 h −1 with 0.3 mmol benzyl alcohol, which is approximately 53 times higher than that of bare CdS nanorods (80 μmol g −1 h −1). The reaction system was highly selective for the oxidation of benzyl alcohol into benzaldehyde. When the amount of benzyl alcohol increased to 1.0 mmol, the hydrogen production reached 9033 μmol g −1 h −1. Scanning electron microscopy and transmission electron microscopy images revealed that p-type MoS 2 sheets with a flower-like structure closely adhered to n-type semiconductor CdS nanorods through the formation of a p-n heterojunction. As a potential Z-scheme photocatalyst, the CdS@MoS 2 heterostructure effectively produces and separates electron-hole pairs under visible light. Thus, the electrons are used for reduction to generate hydrogen, and the holes oxidize benzyl alcohol into benzaldehyde. Moreover, a mechanism of photogenerated charge transfer and separation was proposed and verified by photoluminescence, electrochemical impedance spectroscopy, photocurrent and Mott-Schottky measurements. The results reveal that the CdS@MoS 2 heterojunctions have rapid and efficient charge separation and transfer, thereby greatly improving benzyl alcohol dehy-drogenation. This work provides insight into the rational design of high-performance Z-scheme photocatalysts and the use of holes and electrons to obtain two valuable chemicals simultaneously.

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“…Various nanomaterials studied for Cr(VI) remediation include nZVI (Sharma et al 2009), MnO2 (Dinh et al 2020), ZnO (Le et al 2019), TiO2 (Gopinath et al 2020), Fe2O3 (Li et al 2019, and their variants with other metal/metal oxides and chalcogenides (Karimi-Maleh et al 2020;Peng and Guo 2020;Zhao et al 2019). Recently Cu/Cu2O nanoparticles have found application in electrochemical sensing (Devnani et al 2019;Li et al 2018) and adsorption of heavy metal (Iqbal et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of pistachio shell powder and nano-zerovalent copper for chromium remediation from aqueous solution

Kumar

Brar

Babu

et al. 2021

Environ Sci Pollut Res

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Pistachio shell powder supported nano-zerovalent copper (ZVC@PS) material prepared by borohydride reduction, was characterized using SEM, FTIR, XRD, TGA/DTA, BET, and XPS. SEM, XRD, and XPS revealed the nanozerovalent copper to consist of a core-shell structure with CuO shell and Cu(0) core with a particle size of 40-100 nm and spherical morphology aggregated on PS biomass. ZVC@PS was found out to contain 39% (w/w %) Cu onto the pistachio shell biomass. Batch sorption of Cr(VI) from the aqueous using ZVC@PS were studied, and was optimized for dose (0.1-0.5 g/L), initial Cr(VI) concentration(1-20 mg/L) and pH (2-12). Optimized conditions were 0.1 g/L doses of sorbent and pH=3 for Cr(VI) adsorption. Langmuir and Freundlich adsorption isotherm models fitted well to the adsorption behavior of ZVC@PS for Cr(VI) with a pseudo-second-order kinetic behavior.ZVC@PS (0.1g/L) exhibits qmax for Cr(VI) removal up to 111.1 mg/g. XPS and other spectroscopic evidence suggest the adsorption of Cr(VI) by pistachio shell powder, coupled with reductive conversion of Cr(VI) to Cr(III) by ZVC particles to produce a synergistic effect for the efficient remediation of Cr(VI) from aqueous medium.

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Simultaneous removal of tetracycline and Cr(VI) by a novel three-dimensional AgI/BiVO4 p-n junction photocatalyst and insight into the photocatalytic mechanism

Cited by 162 publications

References 58 publications

Simultaneous remediation of hexavalent chromium and organic pollutants in wastewater using period 4 transition metal oxide-based photocatalysts: a review

Simultaneous remediation of hexavalent chromium and organic pollutants in wastewater using period 4 transition metal oxide-based photocatalysts: a review

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

Synergistic effect of pistachio shell powder and nano-zerovalent copper for chromium remediation from aqueous solution

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