Facile fabrication of CdS/ZnAlO heterojunction with enhanced photocatalytic activity for Cr(VI) reduction under visible light

Chen, Chao-Rong; Zeng, Hong‐Yan; Xu, Sheng; Shen, Jiachao; Guo, Hu; Zhu, Runliang; Du, Jinze; Sun, Yun-Xin

doi:10.1016/j.clay.2018.08.019

Cited by 37 publications

(10 citation statements)

References 46 publications

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“…20−23 Many researchers have invested much effort in developing photocatalysts for the reduction of Cr(VI). For example, the commonly used photocatalysts consist of titanium dioxide, 24 zinc oxide (ZnO), 25 metal sulfides (CdS and SnS 2 ), 26 etc. However, the applications of these photocatalysts are always limited by their unsuitable band gap, poor stability, and low efficiency, resulting in weak visible-light absorption, photodissolution, and secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Reduced Phosphomolybdate Hybrids as Efficient Visible-Light Photocatalysts for Cr(VI) Reduction

Hua

Zhang

et al. 2019

Inorg. Chem.

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Photocatalytic reduction of hexavalent chromium [Cr(VI)] is a promising technology approach to highly efficiently and environmentally tackle the problem of Cr(VI) pollution, in which the key challenge is in the development of effective photocatalysts. In this work, highly reduced hourglass-type molybdophosphate hybrids with the formulas [Zn(mbpy)(H2O)2]2[Zn(mbpy)(H2O)]2{Zn[P4Mo6O31H7]2}·9H2O (1), [Na(H2O)2]2[Zn(mbpy)(H2O)]2[Zn(mbpy)(H2O)2]2{Zn[P4Mo6O31H6]2}·15H2O (2), and (H2mbpy){[Zn(mbpy)(H2O)]2[Zn(H2O)]2}{Zn[P4Mo6O31H6]2}·10H2O (3) (mbpy = 4,4′-dimethyl-2,2′-bipyridine) have been hydrothermally synthesized and used as photocatalysts for the reduction of Cr(VI) under mild conditions. Structural analysis showed that the inorganic moieties in crystals 1–3 are composed of a unique 0D single cluster form, a 1D chainlike structure, and a 2D-layered structure, respectively, in which polyanions were constructed by hourglass-type molybdophosphates with one Zn(II) ion as the central metal. These hybrids displayed good performance for the photocatalytic reduction of Cr(VI) by virtue of their wide visible-light adsorption, suitable energy band structures, and specific spatial arrangements of polyanionic species. Among them, hybrid 2 exhibits the best photocatalytic performance with a Cr(VI) reduction conversion rate of almost 94.7% within 180 min of reaction time. The photocatalysis mechanism investigation revealed that highly reduced hourglass-type molybdophosphate clusters can be illuminated by visible light. The photoinduced electrons induced by hourglass-type polyanions can directly reduce Cr(VI) to Cr(III), while the photogenerated holes are used to oxidize the sacrificial agent isopropyl alcohol to acetone. This work provides new guidance for the design and preparation of highly efficient photocatalysts for the reduction of Cr(VI).

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Section: Introductionmentioning

confidence: 99%

Reduced Phosphomolybdate Hybrids as Efficient Visible-Light Photocatalysts for Cr(VI) Reduction

Hua

Zhang

et al. 2019

Inorg. Chem.

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“…Visible‐light driven photocatalytic Cr(VI) reduction reaction has been considered as a low‐cost, efficient and environmental friendly pathway for Cr(VI) treatment [7–10] . However, most of previous studies in photocatalysts are limited by their low activities under visible light, necessitating to develop more efficient visible‐light‐driven catalysts for Cr(VI) reduction [11–15] …”

Section: Introductionmentioning

confidence: 99%

Organic Moiety‐Regulated Photocatalytic Performance of Phosphomolybdate Hybrids for Hexavalent Chromium Reduction

Zhang

Hua

et al. 2021

Chemistry An Asian Journal

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Visible‐light‐driven photocatalytic Cr(VI) reduction is a promising pathway to moderate environmental pollution, in which the development of photocatalysts is pivotal. Herein, three hourglass‐type phosphomolybdate‐based hybrids with the formula of: (H2bpe)3[Zn(H2PO4)][Zn(bpe)(H2O)2]H{Zn[P4Mo6O31H6]2} ⋅ 6H2O (1) Na6[H2bz]2[ZnNa4(H2O)5]{Zn [P4Mo6O31H3]2} ⋅ 2H2O (2) and (H2mbpy) {[Zn(mbpy)(H2O)]2[Zn(H2O)]2}{Zn[P4Mo6O31H6]2} ⋅ 10H2O (3) (bpe=trans‐1,2‐bi(4‐pyridyl)‐ethylene; bz=4,4′‐diaminobiphenyl; mbpy=4,4’‐dimethyl‐2,2’bipyridine) were synthesized under the guidance of the functional organic moiety modification strategy. Structural analysis showed that hybrids 1–3 have similar 2D layer‐like spatial arrangements constructed by {Zn[P4Mo6]2} clusters and organic components with different conjugated degree. With excellent redox properties and wide visible‐light absorption capacities, hybrids 1–3 display favourable photocatalytic activity for Cr(VI) reduction with 79%, 70% and 64% reduction rates, which are superior to that of only inorganic {Zn[P4Mo6]2} itself (21%). The investigation of organic components on photocatalytic performance of hybrids 1–3 suggested that the organic counter cations (bpe, bz and mbpy) can effectively affect the visible‐light absorption, as well as the recombination of photogenerated carriers stemmed from {Zn[P4Mo6]2} clusters, further promoting their photocatalytic performances towards Cr(VI) reduction. This work provides an experimental basis for the design of functionalized photocatalysts via the modification of organic species.

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“…[5] The reduction of hexavalent chromium to its less toxic trivalent oxidation state remains to be a significant research hotspot in waste water treatment. [6] Chemical reduction and photo-reduction have been studied as the means to reduce hexavalent chromium to trivalent chromium. The challenge remains to the expenses of the reductant chemicals and the secondary pollution caused by the reductant chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…Different techniques for the removal of hexavalent chromium in waste water have been researched and adsorption has emerged as one of the best technology but it remain challenged by the low adsorption capability of most of adsorbents which result into secondary pollution [5] . The reduction of hexavalent chromium to its less toxic trivalent oxidation state remains to be a significant research hotspot in waste water treatment [6] . Chemical reduction and photo‐reduction have been studied as the means to reduce hexavalent chromium to trivalent chromium.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reduction of Hexavalent Chromium (Cr⁶⁺) Over BiOI Calcined at Different Temperature Under Visible Light Irradiation

et al. 2021

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Synthesis of photocatalysts with high charge separation and transfer efficiency are of huge significance in the photocatalytic waste water treatment technology. Herein, we report the phase transformation of bismuth oxyiodide through the facile calcination of BiOI microsphere at different temperatures. Different phases including BiOI, Bi 4 O 5 I 2 and Bi 5 O 7 I were obtained as confirmed by different characterization techniques studied. The synthesized photocatalysts depicted high visible light absorption efficiency in a range of ∼ 655 to 420 nm. The photo-catalytic activity of the synthesized photocatalyst were studied on the reduction of the highly carcinogenic and toxic hexavalent chromium as the representative heavy metal in waste water. Bi 4 O 5 I 2 depicted high photocatalytic activity (k = 0.0366 min À 1 ) which was ascribed to high charge separation and transfer as evidenced in PL, photocurrent response and EIS. This study may furnish a new concept in designing a series of phases that are more advantageous in solar energy conversion.

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Facile fabrication of CdS/ZnAlO heterojunction with enhanced photocatalytic activity for Cr(VI) reduction under visible light

Cited by 37 publications

References 46 publications

Reduced Phosphomolybdate Hybrids as Efficient Visible-Light Photocatalysts for Cr(VI) Reduction

Reduced Phosphomolybdate Hybrids as Efficient Visible-Light Photocatalysts for Cr(VI) Reduction

Organic Moiety‐Regulated Photocatalytic Performance of Phosphomolybdate Hybrids for Hexavalent Chromium Reduction

Photocatalytic Reduction of Hexavalent Chromium (Cr⁶⁺) Over BiOI Calcined at Different Temperature Under Visible Light Irradiation

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Facile fabrication of CdS/ZnAlO heterojunction with enhanced photocatalytic activity for Cr(VI) reduction under visible light

Cited by 37 publications

References 46 publications

Reduced Phosphomolybdate Hybrids as Efficient Visible-Light Photocatalysts for Cr(VI) Reduction

Reduced Phosphomolybdate Hybrids as Efficient Visible-Light Photocatalysts for Cr(VI) Reduction

Organic Moiety‐Regulated Photocatalytic Performance of Phosphomolybdate Hybrids for Hexavalent Chromium Reduction

Photocatalytic Reduction of Hexavalent Chromium (Cr6+) Over BiOI Calcined at Different Temperature Under Visible Light Irradiation

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Photocatalytic Reduction of Hexavalent Chromium (Cr⁶⁺) Over BiOI Calcined at Different Temperature Under Visible Light Irradiation