Enhanced Visible Light Photocatalytic Reduction of Cr(VI) over a Novel Square Nanotube Poly(Triazine Imide)/TiO2 Heterojunction

Yan, Xin; Ning, Guotao; Zhao, Peng

doi:10.3390/catal9010055

Cited by 18 publications

(14 citation statements)

References 38 publications

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“…The reaction related in this photoreduction process are represented in Eqs. (7)(8)(9)(10)(11)(12)(13)(14)(15)(16).…”

Section: Cr(vi) Reduction Mechanismmentioning

confidence: 99%

“…Photocatalytic reduction technology manifests a high reduction efficiency and low energy consumption. The low cost and simple application make this process quite attractive to reduce hazardous Cr(VI) to benevolent Cr(III) [14]. Furthermore, photocatalysts can be recycled and reused repeatedly after completing photocatalytic reduction process [15].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

et al. 2019

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In this study, the photocatalytic reduction of Cr(VI) to Cr(III) in aqueous solution using 1 wt% Cu/ZnO photocatalyst in presence of ethylenediaminetetraacetic acid (EDTA) under UV irradiation was investigated. The photocatalytic Cr(VI) reduction with ZnO under UV irradiation was significantly low. A fast Cr(VI) reduction with ZnO was recorded in presence of EDTA. Results demonstrated that the rate constant raised from 1.6 × 10 −2 to 7.5 × 10 −2 min −1 with 20 ppm EDTA addition. The optimum reduction (90%) was observed within 30 min at pH 3. The reduction efficiency of Cr(VI) was evidently increased from 6% to 99%, with increasing ZnO dosages up to 40 mg. The role of co-catalysts such as Au, Ag, Cu and NiO was also studied. The addition of Cu ion remarkably accelerated the reduction of Cr(VI), compared with ZnO/ EDTA system alone. The Cu motivated ZnO/EDTA system completed the 99% reduction within only 30 min. The Cu ions were reduced to metallic copper and Cu 2 O by conduction band electrons of ZnO. The electron-hole recombination was gently declined by the shallow electron trapping of Cu. On the other hand, EDTA could be performed in two ways by forming Cr(III)-complex and separating Cr(III) from ZnO surface and by consuming valence band holes. The Cu modified ZnO photocatalyst was characterized by N 2 adsorption-desorption isotherm, TEM, EDX, XPS, DRS and PL spectra. We evaluated the influence of pH, photocatalyst dosage, initial concentration of EDTA and initial concentration of Cu 2+ ion (Cu doping amount) on photocatalytic reduction of Cr(VI). The pseudo first order kinetic reaction was confirmed for this reduction process. Herein, a probable mechanism of this photocatalytic reduction process was also presented.

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“…The reaction related in this photoreduction process are represented in Eqs. (7)(8)(9)(10)(11)(12)(13)(14)(15)(16).…”

Section: Cr(vi) Reduction Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

et al. 2019

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“…This method combines the advantages of solid‐state synthesis and solution synthesis, and shows great application value in improving crystallinity, [ 28–31 ] adjusting morphology, [ 32–37 ] promoting heterojunction formation [ 35,38–42 ] and assisting doping, [ 43–48 ] etc. As a simple and efficient material synthesis method, MSM will promote the further development of photocatalytic technology.…”

Section: Introductionmentioning

confidence: 99%

Molten‐Salt Technology Application for the Synthesis of Photocatalytic Materials

Luo

Wang

et al. 2021

Energy Tech

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Most of the photocatalytic materials are prepared by wet chemical methods and calcination methods. These preparation methods usually have the problems of slow reaction speed and low crystallinity of products, which seriously restrict the development of photocatalytic technology. Molten salt method (MSM) has attracted much attention of researchers because of its unique advantages in optimizing the synthesis route of photocatalyst. Herein, the application of molten salt technology in the preparation of photocatalytic materials in recent years is summarized. The advantages of MSM in photocatalytic synthesis, such as promoting crystallization, adjusting morphology, accelerating the construction of heterostructure, stabilizing single atom, doping auxiliary elements and adjusting defect position, are also discussed in detail. It is indicated that MSM has important application potential in the preparation of photocatalytic materials. Meanwhile, the research achievements and existing problems of MSM are summarized, and suggestions for further application of MSM in photocatalyst's preparation are put forward.

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“…However, as the reduction potential of Cr(VI) becomes more negative at higher pH, the photocatalytic reduction of the Cr(VI) ion is favored in a lower pH range. Oxides such as TiO 2 [14,16,17] and ZnO [2] have been reported as efficient photocatalysts for this process but these oxides may not be totally stable in acid media [18,19].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reduction of Cr(VI) in the Presence of Humic Acid Using Immobilized Ce–ZrO2 under Visible Light

et al. 2020

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Cr(VI) has several industrial applications but it is one of the most dangerous pollutants because of its carcinogenicity and high toxicity. Thus, the removal of Cr(VI) by photocatalytic reduction was investigated. The catalyst applied, Ce–ZrO2, was immobilized, through a sol–gel process on a silicon carbide (SiC) support, to increase the efficiency and avoid using suspended nanoparticles. The influence of initial pH, humic acid (HA), and catalyst dosage was investigated for Cr(VI) containing solutions. Then, a real galvanizing industry effluent (Cr(VI) = 77 mg L-1mg.L−1, Zn = 1789 mg L−1) was treated. It was observed that Cr(VI) adsorption and photoreduction are greatly favored at low pH values. HA can decrease Cr(VI) adsorption but also acts as holes scavenger, reducing the electron–hole recombination, favoring then the photoreduction. With the immobilized Ce–ZrO2, more than 97% of Cr(VI) was removed from the diluted effluent. These results indicate the feasibility to treat Cr(VI) effluents even in the presence of other metals and natural organic matter. The developed material has great chemical and mechanical resistances and avoids the use of nanoparticles, dangerous for the environment and hard to recover. Moreover, solar light can be used to drive the process, which contributes to the development of more sustainable, cleaner, and cost-effective wastewater treatments.

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Enhanced Visible Light Photocatalytic Reduction of Cr(VI) over a Novel Square Nanotube Poly(Triazine Imide)/TiO2 Heterojunction

Cited by 18 publications

References 38 publications

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination

Molten‐Salt Technology Application for the Synthesis of Photocatalytic Materials

Photocatalytic Reduction of Cr(VI) in the Presence of Humic Acid Using Immobilized Ce–ZrO2 under Visible Light

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