Synergistic photosensitized removal of Cr(VI) and Rhodamine B dye on amorphous TiO2 under visible light irradiation

Wang, Qi; Chen, Xueshuang; Yu, Keer; Zhang, Yi; Cong, Yanqing

doi:10.1016/j.jhazmat.2012.12.017

Cited by 110 publications

(29 citation statements)

References 42 publications

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“…Upon introduction of the dyes to the Cr VI system, the dye sensitization may broaden the light absorption range of TiO 2 , which can increase sunlight photon utilization. [37,38] The oxidation of dyes in the presence of Cr VI was also tested with the floating OMT/PUF photocatalyst. Figure 8 shows that after 30 min dark adsorption in the coexisting Cr VI system, the removal efficiencies of RhB, MO, and MB were 60.1, 69.1, and 59.4 %, respectively.…”

Section: Photocatalytic Performancementioning

confidence: 99%

Multifunctional Floating Titania‐Coated Macro/Mesoporous Photocatalyst for Efficient Contaminant Removal

et al. 2014

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A multifunctional floating photocatalyst consisting of highly active well‐ordered mesoporous TiO2 (OMT) as a catalyst and polyurethane foam (PUF) as a floating substrate is synthesized successfully through a low‐temperature ultrasonic and deposition approach. With the synthesized OMT/PUF composites, the multifunctionality of contaminant adsorption, dye degradation, and heavy metal removal can be achieved simultaneously. The prepared photocatalyst is characterized in detail by X‐ray diffraction, Raman spectroscopy, transmission electron microscopy, scanning electron microscopy, and N2 adsorption. The results indicate that the OMT/PUF presents a hierarchical macro/mesoporous structure, which is favorable for the adsorption and diffusion of pollutants and for the efficient utilization of sunlight. The degradation of several model dyes including rhodamine B, methyl orange, methylene blue, and simultaneous reduction of hexavalent chromium are examined over the floating photocatalysts with sunlight irradiation under certain conditions. A synergistic effect between the degradation of dyes and the reduction of CrVI is observed for the dye‐CrVI coexistence system. This novel floating OMT/PUF photocatalyst is very promising in the field of wastewater treatment.

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Section: Photocatalytic Performancementioning

confidence: 99%

Multifunctional Floating Titania‐Coated Macro/Mesoporous Photocatalyst for Efficient Contaminant Removal

et al. 2014

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“…Moreover, a great deal of photocatalytic materials have been explored and studied, including TiO 2 [2][3][4][5], Fe 2 O 3 [6][7][8], BiVO 4 [9][10][11], and g-C 3 N 4 [12][13][14]. Typically, TiO 2 has attracted more attention due to high chemical stability, large availability, low cost and low toxicity [15].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of 3D Bi2O3-BiOI heterojunction by a simple dipping method: Highly enhanced visible-light photoelectrocatalytic activity

Cong

et al. 2017

Chemical Engineering Journal

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122

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Three-dimentional (3D) Bi 2 O 3-BiOI heterojunction was fabricated on the basis of Bi 2 O 3 film by a simple dipping method at room temperature. The as-prepared film samples were characterized by scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-Vis DRS spectra. Results indicated that BiOI nanosheets with cross-flake arrays were formed via in situ etching and exchanging of Bi 2 O 3 layer by Iin KI aqueous solution, which grow around the residual Bi 2 O 3 particles to form 3D Bi 2 O 3-BiOI heterojunction. Liner sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) Nyquist plots and incident monochromatic photon-to-current conversion efficiency (IPCE) indicated that easier generation, separation and transfer of photogenerated charges were achieved on the special 3D heterojunction. The photocurrent density of the 3D Bi 2 O 3-BiOI composite increased by 8.4 times relative to pure Bi 2 O 3 at 0.35 V vs. Ag/AgCl in 0.2 M Na 2 SO 4 aqueous solution under visible light irradiation. For the PEC degradation of phenol, the composite film also exhibited greatly enhanced activity. The calculated rate constant was 3.8 times that on pure Bi 2 O 3. Furthermore, good stability in long-time photocurrent and cyclic degradation of phenol can both be observed, indicating that the 3D Bi 2 O 3-BiOI film can be potentially applied in water oxidation and environmental remediation.

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“…Total Cr(VI) was analyzed with the 1,5-diphenylcarbazide colorimetric method (with potassium permanganate). 22 The concentrations of Cr(VI) was measured using the 1,5-diphenylcarbazide colorimetric method 23,24 with an UV/Vis spectrophotometer at 540 nm. The Cr(III) in solutions was analyzed by the difference of total Cr and Cr(VI).…”

Section: Cr(vi) Removal Experimentsmentioning

confidence: 99%

Simultaneous reductive and sorptive removal of Cr(vi) by activated carbon supported β-FeOOH

et al. 2017

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Synergistic photosensitized removal of Cr(VI) and Rhodamine B dye on amorphous TiO2 under visible light irradiation

Cited by 110 publications

References 42 publications

Multifunctional Floating Titania‐Coated Macro/Mesoporous Photocatalyst for Efficient Contaminant Removal

Multifunctional Floating Titania‐Coated Macro/Mesoporous Photocatalyst for Efficient Contaminant Removal

Fabrication of 3D Bi2O3-BiOI heterojunction by a simple dipping method: Highly enhanced visible-light photoelectrocatalytic activity

Simultaneous reductive and sorptive removal of Cr(vi) by activated carbon supported β-FeOOH

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