Photocatalytic remediation of organic waste over Keggin-based polyoxometalate materials: A review

Lai, Sin Yuan; Ng, Kim Hoong; Cheng, Chin Kui; Nur, Hadi; Nurhadi, Mukhamad; Arumugam, Manohar

doi:10.1016/j.chemosphere.2020.128244

Cited by 102 publications

(52 citation statements)

References 129 publications

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“…POM-based hybrid materials showed great potential for the removal of contaminants, such as phthalates and bisphenol A ( Figure 2B ), from wastewater ( Zou et al, 2021 ; Huo et al, 2022 ). These POM-based hybrid materials showed high stability and long duration in either continuous or separated modes for effective water remediation ( Galiano et al, 2021 ; Lai et al, 2021 ). In addition, a voltametric sensor was prepared with the aid of POMs for the determination of simazine in wastewater samples ( Ertan et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

“…Laccase catalyzes substrate oxidation coupled to the four-electron reduction of molecular oxygen to water without releasing these partially reduced O 2 products ROS. While the oxidation catalyzed by POMs may be coupled to the oxygen reduction to produce superoxides, •O 2 − anions ( Lai et al, 2021 ), in the real and complicated water environment. POMs are suitable for facile post-functionalization with other organic or inorganic molecules, which is an effective approach to design advanced catalytic materials.…”

Section: Introductionmentioning

confidence: 99%

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Degradation and Detection of Endocrine Disruptors by Laccase-Mimetic Polyoxometalates

2022

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Endocrine disruptors are newly identified water contaminants and immediately caught worldwide concern. An effort has been made to degrade endocrine disruptors in the water body by relying on laccase-assisted approaches, including laccase-mediated catalytic systems, immobilized laccase catalytic systems, and nano-catalytic systems based on atypical protein enzymes. Analogous to laccases, polyoxometalates (POMs) have a similar size as these enzymes. They are also capable of using oxygen as an electron acceptor, which could assist the removal of endocrine disruptors in water. This perspective begins with a brief introduction to endocrine disruptors and laccases, summarizes current approaches employing laccases, and focuses on the nano-catalytic systems that mimic the function of laccases. Among the inorganic nanoparticles, POMs meet the design requirements and are easy for large-scale production. The catalytic performance of POMs in water treatment is highlighted, and an example of using polyoxovanadates for endocrine disruptor degradation is given at the end of this perspective. Exploring laccase-mimetic POMs will give key insights into the degradation of emergent water contaminants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation and Detection of Endocrine Disruptors by Laccase-Mimetic Polyoxometalates

2022

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“…[2] Among different POMs, molybdovanadophosphate with Keggin structure was commonly used as a strong Brønsted acid type catalyst in biomass conversions. [3][4][5] Many efforts had been made to solidify their structures into heterogeneous forms, which were exhaustively reviewed by Ishii and co-workers. [6] One solidifying is to partially exchange protons of molybdovanadophosphate with Cs + , Ag + , Lewis metal ions such as Sn 4 + , Zn 2 + , or anionic organo-groups of anion, ionic liquid, and quaternary ammonium.…”

Section: Introductionmentioning

confidence: 99%

“…Strong acidic or redox catalysts like polyoxometalates (POMs) or heteropolyacids (HPAs), were considered as essential candidates for various biomass conversions [2] . Among different POMs, molybdovanadophosphate with Keggin structure was commonly used as a strong Brønsted acid type catalyst in biomass conversions [3–5] . Many efforts had been made to solidify their structures into heterogeneous forms, which were exhaustively reviewed by Ishii and co‐workers [6] .…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite‐Supported Polyoxometalates for the Highly Selective Aerobic Oxidation of 5‐Hydroxymethylfurfural or Glucose to 2,5‐Diformylfuran under Atmospheric Pressure

Wang

Guan

et al. 2021

ChemPlusChem

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supported on hydroxyapatite (HAP) (PMo 4 V 8 / HAP (n)) was prepared through the ion exchange of hydroxy groups. This ion exchange favored the oxidative conversion of 5-hydroxymethylfurfural (5-HMF) to 2,5-diformylfuran (DFF) in a one-pot cascade reaction with 96.0 % conversion and 83.8 % yield under 10 mL/min of O 2 flow. PMo 4 V 8 /HAP (31) was used to explore the production of DFF directly from glucose with the highest yield of 47.9 % so far under atmospheric oxygen, whereas the yield of DFF increased to 54.7 % in a one-pot and two-step reaction. These results indicated that the active sites in PMo 4 V 8 /HAP (31) retained their activities without any interference toward one another, which enabled the production of DFF in a more cost-saving way by only using oxygen and one catalyst in a one-step reaction. Meanwhile, the rigid structure of HAP and strong interaction in PMo 4 V 8 /HAP (31) allowed this catalyst to be reused for at least six times with high stability and duration.

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“…Heteropolyacids (HPAs) and polyoxometalates (POMs) are inorganic compounds used since before 1900, which are unmatched not only in terms of molecular and electronic structural versatility but also in terms of reactivity and relevance to analytical chemistry, catalysis, biology, medicine, geochemistry, materials science, and topology [33][34][35][36]. Several recent papers have considered the potential use of these materials in fuel cells due to their ability to strongly adsorb metal catalyst inside the micro-meso pores and their high acidity, which can be exploited to improve both durability and performance.…”

Section: Introductionmentioning

confidence: 99%

Activation of bimetallic PtFe nanoparticles with zeolite-type cesium salts of vanadium-substituted polyoxometallates toward electroreduction of oxygen at low Pt loadings for fuel cells

Renzi

Nobili

Miecznikowski

et al. 2021

J Solid State Electrochem

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The catalytic activity of commercial carbon-supported PtFe (PtFe/C) nanoparticles admixed with mesoporous polyoxometalate Cs3H3PMo9V3O40, (POM3-3–9), has been evaluated towards oxygen reduction reaction (ORR) in acid medium. The polyoxometalate cesium salt co-catalyst/co-support has been prepared by titration using the aqueous solution of phosphovanadomolibdic acid. The synthesized material has been characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results confirm formation of the polyoxometalate salt with the characteristic Keggin-type structure. The composite catalyst has been prepared by mixing the POM3-3–9 sample with the commercial PtFe/C by sonication. The diagnostic rotating ring-disk voltammetric studies are consistent with good performance of the system with low Pt loading during ORR. The fuel cell membrane electrode assembly (MEA) utilizing the PtFe/POM-based cathode has exhibited comparable or better performance (at relative humidity on the level of 100, 62, and 17%), in comparison to the commercial MEA with higher Pt loading at the cathode. Furthermore, based on the cell potential and power density polarization curves, noticeable improvements in the fuel cell behavior have been observed at the low relative humidity (17%). Finally, the accelerated stress test, which uses the potential square wave between 0.4 V and 0.8 V, has been performed to evaluate MEA stability for at least 100 h. It has been demonstrated that, after initial losses, the proposed catalytic system seems to retain stable performance and good morphological rigidity.

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Photocatalytic remediation of organic waste over Keggin-based polyoxometalate materials: A review

Cited by 102 publications

References 129 publications

Degradation and Detection of Endocrine Disruptors by Laccase-Mimetic Polyoxometalates

Degradation and Detection of Endocrine Disruptors by Laccase-Mimetic Polyoxometalates

Hydroxyapatite‐Supported Polyoxometalates for the Highly Selective Aerobic Oxidation of 5‐Hydroxymethylfurfural or Glucose to 2,5‐Diformylfuran under Atmospheric Pressure

Activation of bimetallic PtFe nanoparticles with zeolite-type cesium salts of vanadium-substituted polyoxometallates toward electroreduction of oxygen at low Pt loadings for fuel cells

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