An Amine‐Functionalized Iron(III) Metal–Organic Framework as Efficient Visible‐Light Photocatalyst for Cr(VI) Reduction

Shi, Li; Wang, Tao; Zhang, Huabin; Chang, Kun; Meng, Xianguang; Liu, Huimin; Ye, Jinhua

doi:10.1002/advs.201500006

Cited by 407 publications

(183 citation statements)

References 49 publications

(74 reference statements)

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“…The film shows to be efficient for the degradation of the dye, which is totally degraded for short times of light exposure. Therefore, these results demonstrate the efficiency of these thin film materials for visible-light photocatalysis41518464748 that should be associated to the high purity of the β-Bi 2 O 3 polymorph achieved by this synthesis strategy.…”

Section: Resultsmentioning

confidence: 56%

Photochemical solution processing of films of metastable phases for flexible devices: the β-Bi2O3 polymorph

Pérez-Mezcua

Bretos

Jiménez

et al. 2016

Sci Rep

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The potential of UV-light for the photochemical synthesis and stabilization of non-equilibrium crystalline phases in thin films is demonstrated for the β-Bi2O3 polymorph. The pure β-Bi2O3 phase is thermodynamically stable at high temperature (450–667 °C), which limits its applications in devices. Here, a tailored UV-absorbing bismuth(III)-N-methyldiethanolamine complex is selected as an ideal precursor for this phase, in order to induce under UV-light the formation of a –Bi–O–Bi– continuous network in the deposited layers and the further conversion into the β-Bi2O3 polymorph at a temperature as low as 250 °C. The stabilization of the β-Bi2O3 films is confirmed by their conductivity behavior and a thorough characterization of their crystal structure. This is also supported by their remarkable photocatalytic activity. Besides, this processing method has allowed us for the first time the preparation of β-Bi2O3 films on flexible plastic substrates, which opens new opportunities for using these materials in potential applications not available until now (e.g., flexible photocatalytic reactors, self-cleaning surfaces or wearable antimicrobial fabrics). Therefore, photochemical solution deposition (PCSD) demonstrates to be not only an efficient approach for the low temperature processing of oxide films, but also an excellent alternative for the stabilization of metastable phases.

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Section: Resultsmentioning

confidence: 56%

Photochemical solution processing of films of metastable phases for flexible devices: the β-Bi2O3 polymorph

Pérez-Mezcua

Bretos

Jiménez

et al. 2016

Sci Rep

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“…At pH 2−4, the predominating species of chromium was Cr2O7 2− , and the reduction reaction of Cr(VI) could be expressed as follows: Cr2O7 2− + 14H + + 6e − → 2Cr 3+ +7H2O. Besides, when the pH value was above 6, the reduction product Cr(III) easily formed Cr(OH)3 precipitation [35], which probably covered the activity sites on the surface of the films and thus caused a decrease of photocatalytic reduction rate.…”

Section: Effect Of Ph On Photocatalytic Reduction Of Cr(vi)mentioning

confidence: 99%

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

et al. 2017

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Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr(VI) over transparent polyvinyl alcohol/titanium dioxide (PVA/TiO2) nanocomposite films under sunlight irradiation. The transparent PVA/TiO2 nanocomposite films were prepared by a simple hydrothermal method combined with a solution casting process. The results revealed that the anatase TiO2 nanoparticles with size less than 10 nm were in-situ generated in PVA matrix, which endowed the films with high transparency. Photocatalytic reduction of Cr(VI) over PVA/TiO2 nanocomposite films exhibited superior visible light photocatalytic activity. Mechanism investigation demonstrated that the PVA acted not only as a transparent support for TiO2 nanoparticles, but also as holes scavengers simultaneously to improve the separation of photogenerated holes and electrons. Meanwhile, the transparent PVA/TiO2 nanocomposite films displayed remarkable stability and excellent recyclability during multicycle Cr(VI) photoreduction. Furthermore, the PVA/TiO2 nanocomposite films showed selective adsorption ability for Cr(III), and thus totally removal of Cr(VI) was achieved after photoreduction process.

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“…Based on this design flexibility, the reasons given below, and our experiences in MOF and electrocatalytic water splitting, we proposed and constructed a new, nanoporous, water-stable, amino-functionalized bimetallic [Fe 2 NiO(BDC-NH 2 ) 3 (H 2 O) 3 ] MOF (or named NH 2 -MIL-88B(Fe 2 Ni) MOF), abbreviated as NFN-MOF, based on a 2-aminoterephthalic acid (H 2 BDC-NH 2 ) linker in the form of microbundles of nanosheets on the backbone surface of NF to be applied as a cost-effective, highly efficient, and durable electrocatalyst for alkaline water splitting (Scheme 1). [12] (iv) The highly conducting and macroporous nature of the NF can improve the overall charge transport of the electrode, mass transport of electrolytes, and mass transport of the resulting products (H 2 and O 2 gases). [36] (ii) Unlike most MOFs, the family of MIL-88 MOFs are quite stable in water [37] as well as in basic and acidic solutions, which are critically essential for electrocatalytic OER and HER.…”

Section: Introductionmentioning

confidence: 99%

In Situ Grown Bimetallic MOF‐Based Composite as Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting with Ultrastability at High Current Densities

Raja

Chuah

2018

Advanced Energy Materials

268

148

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A newly designed water‐stable NH2‐MIL‐88B(Fe2Ni)‐metal–organic framework (MOF), in situ grown on the surface of a highly conducting 3D macroporous nickel foam (NF), termed NFN‐MOF/NF, is demonstrated to be a highly efficient bifunctional electrocatalyst for overall water splitting with ultrastability at high current densities. The NFN‐MOF/NF achieves ultralow overpotentials of 240 and 87 mV at current density of 10 mA cm−2 for the oxygen evolution reaction and hydrogen evolution reaction, respectively, in 1 m KOH. For the overall water splitting, it requires only an ultralow cell voltage of 1.56 V to reach the current density of 10 mA cm−2, outperforming the pairing of Pt/C on NF as the cathode and IrO2 on NF as the anode at the same catalyst loading. The stability of the NFN‐MOF/NF catalyst is also outstanding, exhibiting only a minor chronopotentiometric decay of 7.8% at 500 mA cm−2 after 30 h. The success of the present NFN‐MOF/NF catalyst is attributed to the abundant active centers, the bimetallic clusters {Fe2Ni(µ3‐O)(COO)6(H2O)3}, in the MOF, the positive coupling effect between Ni and Fe metal ions in the MOF, and synergistic effect between the MOF and NF.

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An Amine‐Functionalized Iron(III) Metal–Organic Framework as Efficient Visible‐Light Photocatalyst for Cr(VI) Reduction

Cited by 407 publications

References 49 publications

Photochemical solution processing of films of metastable phases for flexible devices: the β-Bi2O3 polymorph

Photochemical solution processing of films of metastable phases for flexible devices: the β-Bi2O3 polymorph

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

In Situ Grown Bimetallic MOF‐Based Composite as Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting with Ultrastability at High Current Densities

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