Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature

Wang, Qi; Shi, Xiaodong; Xu, Jing; Crittenden, John C.; Liu, Enqin; Zhang, Yi; Cong, Yanqing

doi:10.1016/j.jhazmat.2015.12.050

Cited by 91 publications

(15 citation statements)

References 40 publications

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“…Crystallinity of the binary compound semiconductors depends on the calcination temperature and also the photocatalytic activity of the materials depends on their crystallite phase . The effects of calcination temperature on the photocatalytic activity of ZnNi1 composite nanofibers as catalyst were studied.…”

Section: Resultsmentioning

confidence: 99%

Electrospinning preparation of NiO/ZnO composite nanofibers for photodegradation of binary mixture of rhodamine B and methylene blue in aqueous solution: Central composite optimization

Sabzehmeidani

Karimi

Ghaedi

2018

Applied Organom Chemis

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One-dimensional nanofiber of p-type NiO/n-type ZnO heterojunctions with various molar ratios of Ni to Zn at different calcination temperatures were successfully synthesized using the electrospinning method, and they were fully characterized. The photocatalysts thus obtained were applied in aqueous solutions for rhodamine B (RDB) and methylene blue (MB) degradation. The p-n heterojunctions built among the cubic structure NiO and hexagonal structure ZnO in the composite nanofiber are responsible for generation of electrons and holes and subsequently superoxide and hydroxyl radical production by carriers which lead to degradation of the dyes in solution. The composite nanofibers (ZnNi1) calcined at 550°C for 3 h showed the highest photocatalytic activity for degradation of the dyes in aqueous solution. The optimum values were found to be 180 min, 7.0, 1 g l −1 and 3.0 and 3.0 mg l −1 for irradiation time, pH, photocatalyst dosage and initial concentration of RDB and MB, respectively. For these optimum conditions, the photocatalytic degradation of RDB and MB was found to be 99.37 and 98.44%, respectively. The maximum photodegradation of RDB and MB using ZnNi1 was 59.41 and 65.43%, respectively. First-order kinetics based on the Langmuir-Hinshelwood model successfully fitted the experimental data.

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Section: Resultsmentioning

confidence: 99%

Electrospinning preparation of NiO/ZnO composite nanofibers for photodegradation of binary mixture of rhodamine B and methylene blue in aqueous solution: Central composite optimization

Sabzehmeidani

Karimi

Ghaedi

2018

Applied Organom Chemis

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“…Thus, the remediation reduction of Cr(VI) to Cr(III) has gained considerable attention. Recently, photocatalysis driven by solar energy for reducing Cr(VI) to Cr(III) has been the focus of numerous studies [4][5][6][7][8]. TiO 2 -WO 3 -PANI membranes were designed to realize the effective reduction of chromium (VI) in a reactor under visible light [9].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Removal of Hexavalent Chromium over Bi12TiO20/RGO Polyhedral Microstructure Photocatalysts

et al. 2022

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A Bi12TiO20/RGO photocatalyst with polyhedron microstructure was fabricated via the template-free hydrothermal method, and the visible-light-induced photocatalytic activity of the prepared Bi12TiO20 was also evaluated by the photocatalytic reduction of heavy metal pollutants. The structures and optical properties of the prepared Bi12TiO20/RGO were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–vis diffuse reflectance spectrum (UV–vis DRS). The effects of the reaction time and mineralizer concentration on the formation of the Bi12TiO20 polyhedral microstructure were analyzed. The enhanced photocatalytic performances of Bi12TiO20/RGO were observed which were ascribed to the combination of the Bi12TiO20 microstructure induced photogenerated charges and the RGO nanostructure as a photogenerated charges carrier. The effect of organic acids, p-hydroxybenzoic acid (PHBA), chloroacetic acid, and citric acid on the Cr(VI) photocatalytic reduction was also discussed. This work provides an insight into the design of the bismuth-based microstructure photocatalyst towards the application for environment purification of heavy metals.

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“…Photocatalytic reduction of Cr(VI) to the less toxic Cr(III) ions using existing catalysts has been extensively been studied. The photocatalysts used include TiO 2 -impregnated ceramic hollow fibers [13], TiO 2 /g-C 3 N 4 microspheres/reduced graphene oxide, AgI/TiO 2 [14], Zn-Al-layered double hydroxide and TiO 2 composites [15], TiO 2 -coated cellulose acetate monolithic structures [16], hollow TiO 2 from polystyrene@TiO 2 [17], and CoO x NP-loaded TiO 2 nanosheets [18]. A key factor in this method is to design a material with a good UV visible absorption cross section and efficient charge separation for Cr(VI) reduction [19].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Cr(VI) Reduction over Terpyridine-Derivatized Ti Sheets

Park

Rhee

et al. 2020

Appl. Sci. Converg. Technol.

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Cr(VI) reduction has been used to diminish the high toxicity of the Cr(VI) ion in the environment. Herein, electrochemical (EC) reduction was demonstrated using Au NP-loaded Ti electrodes functionalized with 2,2':6',2''-terpyridine-4'-thiol (STpy). Cyclic voltammetry tests were performed and these revealed Cr(VI) reduction potentials around 0.55, 0.35, and 0.55 V (vs Ag/AgCl) for bare Ti, Au NP-loaded Ti, and STpy-functionalized Au NP-loaded Ti (Ti-AuNP-STpy) electrodes, respectively. The reduction potential and Cr(VI) reduction performance varied with Ti oxidation state as well as surface functionalization. The EC Cr(VI) reduction using the Ti-AuNP-STpy electrode was found to have the best reduction performance. In addition, for future potential applications, the surface plasmon resonance response was also demonstrated for Cr(III) and Cr(VI) sensing over the Au-STpy surface. Thus, these novel electrode systems provide very useful information for developing improved detoxification methodologies.

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Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature

Cited by 91 publications

References 40 publications

Electrospinning preparation of NiO/ZnO composite nanofibers for photodegradation of binary mixture of rhodamine B and methylene blue in aqueous solution: Central composite optimization

Electrospinning preparation of NiO/ZnO composite nanofibers for photodegradation of binary mixture of rhodamine B and methylene blue in aqueous solution: Central composite optimization

Enhanced Photocatalytic Removal of Hexavalent Chromium over Bi12TiO20/RGO Polyhedral Microstructure Photocatalysts

Electrochemical Cr(VI) Reduction over Terpyridine-Derivatized Ti Sheets

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