Two novel Anderson-type polyoxometalate-based metal–organic complexes with high-efficiency photocatalysis towards degradation of organic dyes under UV and visible light irradiation

Wang, Xiuli; Chang, Zhihan; Huang, Lin; Tian, Aixiang; Liu, Guocheng; Zhang, Ju‐Wen; Liu, Dan-Na

doi:10.1039/c4ra15608k

Cited by 41 publications

(13 citation statements)

References 39 publications

(11 reference statements)

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“…Thus, in contrast to the well‐documented reactivity of metal‐functionalized lacunary Keggin and Lindqvist anions, little is known about the effects of metal substitution in the Anderson anion. This information, however, is critical as metal exchange is expected to significantly affect the electronic structure of the anion and thus its reactivity in redox and light‐driven processes …”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Light‐Driven Hydrogen Evolution by Polyoxometalate–Photosensitizer Dyads

Schönweiz

Heiland

Anjass

et al. 2017

Chemistry A European J

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The visible‐light‐driven hydrogen evolution reaction (HER) by covalent photosensitizer–catalyst dyads is one of the most elegant concepts in supramolecular homogeneous solar energy conversion. The intricacies of catalyst reactivity and photosensitizer–catalyst interactions require a detailed fundamental understanding of the system to rationalize the observed reactivities. Here, we report three dyads based on the covalent imine‐bond linkage of an iridium photosensitizer and an organo‐functionalized Anderson polyoxometalate anion [MMo6O18{(OCH2)3CNH2}2]3− (M=Mn3+, Fe3+, Co3+). Modification of the central metal ion M is used to modulate the HER activity. Detailed theoretical and experimental studies examine the role of the central metal ion M and provide critical understanding of the redox activity and light‐driven HER activity of the novel dyads. Thus, the study enables a knowledge‐based optimization of HER dyads by chemical modification of the reactive metal oxide components.

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Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Light‐Driven Hydrogen Evolution by Polyoxometalate–Photosensitizer Dyads

Schönweiz

Heiland

Anjass

et al. 2017

Chemistry A European J

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“…Polyoxometalates can be immobilized on electrode surfaces by various methods such as modification, immobilization as a dopant in conductive polymeric matrices, adsorption, layer‐by‐layer approaches, and immobilization in inorganic matrices . Among these approaches, entrapment of polyoxometalate into an inorganic matrix was considered an attractive methodology for sensor fabrication due to stability and simplicity.…”

Section: Resultsmentioning

confidence: 99%

“…Various catalytic systems have been reported for the photocatalytic degradation of pollutants . Among these, polyoxometalates (POMs) can perform well in dye removal efficiencies because of their unusual properties . Although POMs exhibit photocatalytic activity in homogenous systems, the main disadvantages of using them as photocatalysts lie in their low surface area and the difficulty of their separation from the reaction mixture .…”

Section: Introductionmentioning

confidence: 99%

“…Although POMs exhibit photocatalytic activity in homogenous systems, the main disadvantages of using them as photocatalysts lie in their low surface area and the difficulty of their separation from the reaction mixture . Recent studies have shown that the immobilization of soluble POM units onto suitable supports can be an effective method to overcome the mentioned problems . Recently, the applications of magnetic nanoparticles as catalyst supports have become a hot topic due to their unique properties such as high surface area, good dispersion, and magnetic behavior, as well as their low toxicity.…”

Section: Introductionmentioning

confidence: 99%

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Developments of modified magnetic nanoparticle‐supported heteropolyacid photocatalytic performances in methylene blue scavenger

Kazemi

Teimouri

Salavati

2018

J Chinese Chemical Soc

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In this project, the Keggin‐type polyoxometalate, H5PMoV2O40 (denoted as PMoV), was immobilized on modified NiFe2O4 nanoparticles to produce a magnetically separable catalyst. This catalyst was characterized using X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FT‐IR), field emission scanning electron microscopy (FESEM), cyclic voltammetry (CV), energy‐dispersive X‐ray (EDX), and UV–vis diffuse reflectance spectroscopy (UV‐DRS). The synthesized catalyst demonstrated a high photocatalytic activity in the degradation of methylene blue (denoted as MB) as a pollutant under UV light irradiation. The catalyst could be readily separated from the photocatalytic system using the magnetic field, and the loss of activity was negligible when the catalyst was recovered in five consecutive runs. In addition, optimization was performed using multiresponse optimization and the desirability function approach of the central composite design (CCD). The effects of various factors, such as the catalyst amount, contact time, and pH, on the degradation of MB were investigated. Optimization results for the 20 mg/L MB showed that the maximum degradation efficiency of 95.8% at optimum conditions was: catalyst amount: 22.35 mg, pH = 7.81, and time: 67 min, at ambient pressure and temperature.

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“…Recently the application of polyoxometalate in degradation of dyes were reported [8][9][10][11]. Among these approaches, entrapment of POMs into the inorganic matrix was considered as an attractive methodology for sensor fabrication due to stability and simplicity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of photocatalytic performance of keggin type heteropolyacid in degradation of methylene blue

2017

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In this project, keggin-type polyoxometalate, cationic exchange Q5PMoV2O40 (denoted as TBA-PMoV) was synthesized to produce a recoverable catalyst. This catalyst was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Field Emission scanning electron microscopy (FESEM) and UVvis diffuse reflectance spectroscopy (UV-DRS). The synthesized catalyst showed high photocatalytic activity in the degradation of methylene blue as a pollutant under UV light irradiation. The effect of various factors such as catalyst amount, contact time and pH on degradation of methylene blue (denoted as MB) were investigated. Formal batch adsorption studies was applied for investigation of effects of various parameters, such as initial solution pH, initial dye concentration, catalyst amount, temperature, etc. Optimization results for 20 mg/L methylene blue showed that maximum degradation efficiency 96.8 % at the optimum conditions was found to be: catalyst amount 25 mg, pH= 7.6 and time 60 min at ambient pressure and temperature.

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Two novel Anderson-type polyoxometalate-based metal–organic complexes with high-efficiency photocatalysis towards degradation of organic dyes under UV and visible light irradiation

Abstract: Two novel Anderson-type polyoxometalate-based metal–organic complexes constructed from two bis-pyridyl-bis-amide ligands have been hydrothermally synthesized, showing excellent photocatalytic activities toward the degradation of dyes.

Cited by 41 publications

References 39 publications

Experimental and Theoretical Investigation of the Light‐Driven Hydrogen Evolution by Polyoxometalate–Photosensitizer Dyads

Experimental and Theoretical Investigation of the Light‐Driven Hydrogen Evolution by Polyoxometalate–Photosensitizer Dyads

Developments of modified magnetic nanoparticle‐supported heteropolyacid photocatalytic performances in methylene blue scavenger

Investigation of photocatalytic performance of keggin type heteropolyacid in degradation of methylene blue

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