Carbon nitride coupled Ti-SBA15 catalyst for visible-light-driven photocatalytic reduction of Cr (VI) and the synergistic oxidation of phenol

Liu, Fenghui; Yu, Jie; Tu, Guangyuan; Qu, Lijun; Xiao, Jin-Fen; Liu, Yongdi; Wang, Lingzhi; Lei, Juying; Zhang, Jinlong

doi:10.1016/j.apcatb.2016.08.001

Cited by 141 publications

(41 citation statements)

References 49 publications

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“…Interestingly, TiO 2 alone gave some activity, most likely owing to photosensitization of the film by the chromium(VI) source, which has a pale‐yellow colour in aqueous solution. Solutions used in Cr VI photoreduction tests are typically acidified, which has been suggest to be owing to the consumption of H + during the reduction as follows:

true {normalC normalr}_{2} O_{7}^{2 -} + 14 {normalH}^{+} + 6 e_{c b}^{-} \to 2 {C r}^{3 +} + 7 H_{2} normalO

…”

Section: Resultsmentioning

confidence: 99%

“…Semiconductor photocatalysis has been shown in recent years to be effective in water purification . Photo‐oxidation of organic contamination, photo‐oxidation or reduction of toxic metal ions to less toxic oxidation states and the production of radicals that are highly effective in destroying bacteria have all been demonstrated by using a variety of different semiconductors over recent years . To date, the most studied semiconductor for this purpose is titanium dioxide (TiO 2 ), which has gained much success owing to its low cost, low toxicity and high stability.…”

Section: Introductionmentioning

confidence: 99%

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Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

et al. 2017

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By using a simple thermal decomposition route, carbon‐TiO2 hybrid films have been synthesized from a catechol‐TiO2 surface complex. The coated films display enhanced visible region absorption, owing to the thin (≈2 nm) layer of carbon encapsulating the TiO2. Although photocatalytically active under visible light alone, it is demonstrated that the activity of the carbon‐coated films can be improved further by a hydrolytic treatment with TiCl4, leading to the introduction of small TiO2 particles (5–10 nm) and doping of chlorine into the structure. The combination of the carbon layer and TiCl4 treatment gives increased photocatalytic performance for the photodegradation of dyes, phenolic pollutants and the reduction of toxic CrVI to relatively benign CrIII. In addition, the carbon‐coated films show improved bactericidal activity under UV irradiation, and hence have been successfully tested against the most common types of pollutant present in potential drinking waters.

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true {normalC normalr}_{2} O_{7}^{2 -} + 14 {normalH}^{+} + 6 e_{c b}^{-} \to 2 {C r}^{3 +} + 7 H_{2} normalO

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

et al. 2017

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“…A Ti–SBA-15–g-C 3 N 4 material was also shown to exhibit higher Cr(VI) photoreduction under visible light illumination. The Ti moiety in Ti–SBA-15 can extract the conduction band electrons of g-C 3 N 4 after visible light irradiation followed by transfer of electrons to Cr(VI) to produce Cr(III) [138]. …”

Section: Reviewmentioning

confidence: 99%

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

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

103

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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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“…As presented in Figure b, bulk‐CN has a large arc radius, which means a high charge transport resistance of the material. The EIS spectrum of CNQDs/CN IO‐12 shows a smaller semicircular diameter than that of CN IO under simulated visible‐light illumination, meaning a lower charge transport resistance, which further confirms the enhanced charge transfer efficiency of CNQDs/CN IO . The construction of the inverse opal structure and the introduction of CNQDs facilitates the faster separation of photogenerated charges, leading to enhanced photocatalytic activity.…”

Section: Resultsmentioning

confidence: 58%

g‐C₃N₄ Inverse Opals with Isotype Heterostructure for Enhanced Visible‐Light‐Driven Photocatalysis

Zhou

Lei

et al. 2018

Chemistry An Asian Journal

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The photocatalytic activity of g-C N is limited by the low surface area and the fast recombination of photogenerated charges. In this work, a g-C N quantum dot (CNQDs) modified g-C N inverse opal (CN IO) metal-free composite (CNQDs/CN IO) was successfully synthesized by a simple calcination method. CNQDs/CN IO exhibited outstanding photocatalytic activity in the removal of organic pollutants represented by phenol, which can be ascribed to (i) the inverse opal structure that enhances the light harvesting, facilitates mass transfer, and provides adequate surface area for photocatalytic reactions; (ii) the incorporation of CNQDs in the framework of g-C N promotes photogenerated charge separation and transfer across the interfaces between CN IO and CNQDs, leading to excellent photoelectrochemical properties. The strategy of self-modification of g-C N with special structures provides a rational design idea to fabricate highly efficient metal-free photocatalysts.

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Carbon nitride coupled Ti-SBA15 catalyst for visible-light-driven photocatalytic reduction of Cr (VI) and the synergistic oxidation of phenol

Cited by 141 publications

References 49 publications

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

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

g‐C₃N₄ Inverse Opals with Isotype Heterostructure for Enhanced Visible‐Light‐Driven Photocatalysis

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Carbon nitride coupled Ti-SBA15 catalyst for visible-light-driven photocatalytic reduction of Cr (VI) and the synergistic oxidation of phenol

Cited by 141 publications

References 49 publications

Improving Carbon‐Coated TiO2 Films with a TiCl4 Treatment for Photocatalytic Water Purification

Improving Carbon‐Coated TiO2 Films with a TiCl4 Treatment for Photocatalytic Water Purification

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

g‐C3N4 Inverse Opals with Isotype Heterostructure for Enhanced Visible‐Light‐Driven Photocatalysis

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Product

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Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

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

g‐C₃N₄ Inverse Opals with Isotype Heterostructure for Enhanced Visible‐Light‐Driven Photocatalysis