Preparation and characterization of ZnO/TiO2 for the photocatalytic reduction of Cr(VI) in aqueous solution

Ku, Young; Huang, Ying-Hau; Chou, Yi-Hsuan

doi:10.1016/j.molcata.2011.04.003

Cited by 76 publications

(21 citation statements)

References 18 publications

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“…It also enhances the specific surface area of the ZnO/TiO 2 composite by inhibiting aggregation and agglomeration of particles. On increasing ZnO content in the ZnO/TiO 2 composite, the rate of reduction of Cr(VI) was increased and the sample containing 2.0 mol % ZnO exhibited a maximum photocatalytic reduction of Cr(VI) in aqueous solution as the recombination of charge carriers is suppressed by the effective transfer of electrons from ZnO to TiO 2 [155]. Further increase in ZnO content created new recombination centers of electron–hole pairs by abundantly available ZnO particles, resulting in a decrease in the degradation rate [156].…”

Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

108

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Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

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Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

108

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“…Among recently innovative technologies, photocatalysis has been proven to be a quite attractive, efficient and clean strategy to reduce the toxic Cr(VI) species to less harmful Cr(III) species [2]. In parallel, various TiO 2 -based semiconductor photocatalysts have been also employed in photocatalytic reduction of Cr(VI) because of their powerful catalytic abilities [3][4][5][6][7]. In these studies, considerable efforts were devoted to extending the spectral response of TiO 2 to visible-light region by doping with different elements or coupling with other semiconductors, allowing more solar energy to be utilized in photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient photocatalytic reduction of Cr(VI) by bismuth hollow nanospheres

Qin

Wang

et al. 2013

Catalysis Communications

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“…However, TiO 2 and hydroniumjarosite have a high electron-hole recombination rate (Rengaraj et al, 2007;Fang et al, 2008;Ku et al, 2011). Therefore, the photocatalytic activities of the TiO 2 and hydroniumjarosite are low.…”

Section: Photocatalytic Degradation Of Mo In Different Reaction Systemsmentioning

confidence: 99%

Enhancement in Photo-Fenton-Like Degradation of Azo Dye Methyl Orange Using TiO₂/Hydroniumjarosite Composite Catalyst

XuZhihui

Fang-di

ShiWeicong

et al. 2015

Environmental Engineering Science

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A novel TiO 2 /hydroniumjarosite composite photocatalyst has been synthesized by a simple hard template method. X-ray diffraction, ultraviolet (UV)-vis diffuse reflectance spectroscopy, transmission electron microscopy, and nitrogen adsorption-desorption measurement were used to characterize the composite photocatalyst. Photocatalytic performance of the prepared composite catalyst was evaluated in a heterogeneous Fenton-like process using methyl orange (MO) as a probe contaminant. The TiO 2 /hydroniumjarosite composite exhibited remarkable enhancement on the photocatalytic activity compared with bare TiO 2 or hydroniumjarosite toward the oxidation of MO under UV light irradiation. Increased light absorption intensity, larger specific surface area, and open porous structure are believed to be the main reasons for enhanced photocatalytic performance of TiO 2 /hydroniumjarosite composite. Results suggest that the as-prepared TiO 2 /hydroniumjarosite composite is an effective and promising photo-Fentonlike catalyst for the degradation of MO and purification of wastewater.

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Preparation and characterization of ZnO/TiO2 for the photocatalytic reduction of Cr(VI) in aqueous solution

Cited by 76 publications

References 18 publications

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Highly efficient photocatalytic reduction of Cr(VI) by bismuth hollow nanospheres

Enhancement in Photo-Fenton-Like Degradation of Azo Dye Methyl Orange Using TiO₂/Hydroniumjarosite Composite Catalyst

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Preparation and characterization of ZnO/TiO2 for the photocatalytic reduction of Cr(VI) in aqueous solution

Cited by 76 publications

References 18 publications

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Highly efficient photocatalytic reduction of Cr(VI) by bismuth hollow nanospheres

Enhancement in Photo-Fenton-Like Degradation of Azo Dye Methyl Orange Using TiO2/Hydroniumjarosite Composite Catalyst

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Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Enhancement in Photo-Fenton-Like Degradation of Azo Dye Methyl Orange Using TiO₂/Hydroniumjarosite Composite Catalyst