Photocatalytic degradation of hexavalent chromium emerging contaminant via advanced titanium dioxide nanostructures

Athanasekou, Chrysoula; Romanos, George E.; Papageorgiou, Sergios K.; Manolis, Georgios; Katsaros, Fotios K.; Falaras, Polycarpos

doi:10.1016/j.cej.2016.06.033

Cited by 84 publications

(21 citation statements)

References 33 publications

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“…Cu/Cu 2 O-decorated TiO 2 /alginate beads synthesized by a novel, environmentally friendly polyol process exhibited excellent photoreduction of Cr(VI). The superior performance may be attributed to the homogeneous TiO 2 dispersion, presence of Cu nanoparticles for facilitating charge separation processes, synergetic effect of the TiO 2 /Cu 2 O heterojunction and the small size of the photocatalyst [168]. …”

Section: Reviewmentioning

confidence: 99%

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

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

111

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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.

111

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“…During photocatalytic processes, 2 ml of solution was extracted using a 0.45 μm filter at 20 min intervals for further analysis. The Cr(VI) concentration was measured at 540 nm using the DPC method with a Laspec Alpha‐1860 spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Facile fabrication of BUC‐21/g‐C₃N₄ composites and their enhanced photocatalytic Cr(VI) reduction performances under simulated sunlight

Wang

et al. 2018

Applied Organom Chemis

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A series of BUC-21/g-C 3 N 4 composites were facilely fabricated from twodimensional metal-organic framework BUC-21 and two-dimensional metal-free polymer semiconductor graphitic carbon nitride (g-C 3 N 4 ) through ball-milling, and characterized via powder X-ray diffraction, Fourier transform infrared spectrometry, thermogravimetric analysis, transmission electron microscopy, and UV-visible diffuse reflectance, X-ray photoelectron and photoluminescence emission spectrometry. The photocatalytic activities of B100G100 (weight ratio of BUC-21 to g-C 3 N 4 being 1:1) towards Cr(VI) reduction were investigated upon the irradiation of simulated sunlight and real sunlight, in which the influences of various organic compounds (tartaric acid, citric acid and oxalic acid) as hole scavengers, pH values (2, 3, 4, 5, 6, 7 and 8) and foreign ions (ions in tap water and real surface water) were also investigated. The results revealed that B100G100 exhibited more outstanding photocatalytic Cr(VI) reduction than individual BUC-21 and g-C 3 N 4 , resulting from enhanced separation of photogenerated electrons and holes, which were confirmed via both photoluminescence emission and electrochemical determination. The B100G100 composite exhibited good reusability and stability after several experimental runs. Also, the corresponding mechanism of photocatalytic reaction was proposed.

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“…Photocatalytic technology which was widely used in hydrogen production, [9–14] CO 2 reduction, [15–18] N 2 fixation, [19–26] and all the other photocatalytic fields to solve energy and environment problem with clean, sustainable, and efficient properties is a promising method to solve this problem. However, many photocatalysts such as TiO 2 with wide bandgap which is larger than 3.2 eV corresponding to the wavelength of ultraviolet light consisting only 4 % of solar energy while visible light and infrared light consisting with 50 % and 46 %, respectively [27–33] . To make full use of visible and infrared light, narrow bandgap photocatalysts are eager to be developed.…”

Section: Introductionmentioning

confidence: 99%

Facile One‐Pot Solvothermal Synthesis of Noble Metal‐Free NiS Modified In₂S₃‐Based Photocatalyst for Highly Efficient Visible‐Light‐Driven Cr⁶⁺ Removal

Wang

Zan

2020

ChemistrySelect

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Rapidly electrons transferring of noble metal‐free electron mediator NiS modifying In2S3 photocatalysts were synthesized through a one‐pot hydrothermal method. Light with longer wavelength scope and stronger intensity can be absorbed and achieving more rapidly electrons transportation speed. PL and photocurrent spectra demonstrating that NiS‐In2S3 composites have higher charge carrier separation efficiency. HRTEM revealed that NiS and In2S3 were contacted in nano size and have intimate contact with each other. XPS further proved there has an influence of the banding energy between NiS and In2S3. 10 % content sample achieving complete removal of Cr6+ with a trace photocatalyst concertation (0.2 mg/mL) within 30 min which was 3 times higher than pure In2S3. The proper mechanism was proposed that In2S3 was excited by visible light to produce electron‐hole pairs, and NiS acted as a light absorbing intensifier and electron trapper conducting electrons from the In2S3 conduction band to the surface of composites and then reacting with the active species, thus improving the charge carrier separation efficiency and photocatalytic activity

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Photocatalytic degradation of hexavalent chromium emerging contaminant via advanced titanium dioxide nanostructures

Cited by 84 publications

References 33 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

Facile fabrication of BUC‐21/g‐C₃N₄ composites and their enhanced photocatalytic Cr(VI) reduction performances under simulated sunlight

Facile One‐Pot Solvothermal Synthesis of Noble Metal‐Free NiS Modified In₂S₃‐Based Photocatalyst for Highly Efficient Visible‐Light‐Driven Cr⁶⁺ Removal

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Photocatalytic degradation of hexavalent chromium emerging contaminant via advanced titanium dioxide nanostructures

Cited by 84 publications

References 33 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

Facile fabrication of BUC‐21/g‐C3N4 composites and their enhanced photocatalytic Cr(VI) reduction performances under simulated sunlight

Facile One‐Pot Solvothermal Synthesis of Noble Metal‐Free NiS Modified In2S3‐Based Photocatalyst for Highly Efficient Visible‐Light‐Driven Cr6+ Removal

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Product

Resources

About

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

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

Facile fabrication of BUC‐21/g‐C₃N₄ composites and their enhanced photocatalytic Cr(VI) reduction performances under simulated sunlight

Facile One‐Pot Solvothermal Synthesis of Noble Metal‐Free NiS Modified In₂S₃‐Based Photocatalyst for Highly Efficient Visible‐Light‐Driven Cr⁶⁺ Removal