Size-Tailored Porous Spheres of Manganese Oxides for Catalytic Oxidation via Peroxymonosulfate Activation

Liu, Qiaoran; Duan, Xiaoguang; Sun, Hongqi; Wang, Yuxian; Tade, Moses O.; Wang, Shaobin

doi:10.1021/acs.jpcc.6b05934

Cited by 69 publications

(18 citation statements)

References 40 publications

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“…Such pores can be very useful in post synthesis treatment to introduce functional and/or catalytically active materials for adsorption and catalytic/photocatalytic degradation of water contaminants [56][57][58] . Fig.…”

Section: Electrochemical Deposition and Characterizations Of Hkust-1 A Facilementioning

confidence: 99%

Electrodeposited Metal Organic Framework toward Excellent Hydrogen Sensing in an Ionic Liquid

Azhar

Hussain

Tadé

et al. 2020

ACS Appl. Nano Mater.

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The synthesis of thin films of metal organic frameworks (MOFs) is a rapidly growing area owing to the use of these highly functional nanomaterials for various applications. In this study, a thin layer of a typical MOF, copper benzene tricarboxylate (HKUST-1), was synthesized by electrodeposition on a glassy carbon (GC) electrode using a potential-step chronoamperometric technique at room temperature. Various characterization techniques including Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to verify the successful deposition of the MOF film and its structure. The electrodeposited MOF crystals showed cuboctahedral morphology with macropores. The MOF-modified electrode was applied for hydrogen gas sensing in a room temperature ionic liquid (RTIL) for the first time.A four-fold increase in current was observed compared to a precious metal surface, i.e. platinum, and the electrode exhibited significant catalytic activity compared to the bare GC electrode, making it a very promising low cost material for hydrogen gas sensing applications.

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Section: Electrochemical Deposition and Characterizations Of Hkust-1 A Facilementioning

confidence: 99%

Electrodeposited Metal Organic Framework toward Excellent Hydrogen Sensing in an Ionic Liquid

Azhar

Hussain

Tadé

et al. 2020

ACS Appl. Nano Mater.

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“…However, we are accompanied by sufferings from two issues: limited resources for raw materials and environmental pollution, one of which is water contamination. Some of the toxic pollutants are refractory to natural degradation; hence, it is crucial to take stringent measures to battle the situation [1][2][3]. Sulfachloropyridazine (SCP) is one of the sulphonamides widely used to be active against bacteria in aquaculture, animal husbandry, and human medicine.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity

et al. 2020

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HIGHLIGHTS• Monodisperse nitrogen-doped carbon nanospheres were synthesized and loaded onto graphitic carbon nitride and the composites show outstanding photocatalytic activity.• Improved sulfachloropyridazine degradation is consistent with density functional theory calculation..ABSTRACT Metals and metal oxides are widely used as photo/ electro-catalysts for environmental remediation. However, there are many issues related to these metal-based catalysts for practical applications, such as high cost and detrimental environmental impact due to metal leaching. Carbon-based catalysts have the potential to overcome these limitations. In this study, monodisperse nitrogen-doped carbon nanospheres (NCs) were synthesized and loaded onto graphitic carbon nitride (g-C 3 N 4 , GCN) via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine (SCP). The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation. The nitrogen content in NC critically influences the physicochemical properties and performances of the resultant hybrids. The optimum nitrogen doping concentration was identified at 6.0 wt%. The SCP removal rates can be improved by a factor of 4.7 and 3.2, under UV and visible lights, by the GCN-NC composite due to the enhanced charge mobility and visible light harvesting. The mechanism of the improved photocatalytic performance and band structure alternation were further investigated by density functional theory (DFT) calculations. The DFT results confirm the high capability of the GCN-NC hybrids to activate the electron-hole pairs by reducing the band gap energy and efficiently separating electron/hole pairs. Superoxide and hydroxyl radicals are subsequently produced, leading to the efficient SCP removal.

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“…Liu et al. [33] synthesized highly porous MnO 2 with different particle sizes using a one-pot hydration and annealing process and their catalytic performances were evaluated under different conditions using the degradation of phenol in aqueous solutions as the test reaction. The smaller particle size of the catalyst and the annealing treatments improved the catalytic activity and stability significantly.…”

Section: Introductionmentioning

confidence: 99%

MnO2 efficiently removes indigo carmine dyes from polluted water

Lekshmi

Yesodharan

2018

Heliyon

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MnO2 is identified as a highly efficient sonocatalyst and sonophotocatalyst for the complete removal of even very small concentration of Indigo carmine (IC) dye pollutant from water. The effect of various reaction parameters, viz. dosage of the catalyst, concentration of pollutant, volume of reaction system, pH, dissolved gases, presence of anions/salts and oxidants etc. on the rate of degradation is evaluated and optimum parameters are identified. The degradation follows variable kinetics depending on the concentration of the substrate. The rate of degradation is facilitated by acidic pH. Classic oxidants H2O2 and S2O82− behave differently, with the former inhibiting and the latter enhancing the degradation. The effect of anions/salts on the degradation is complex and ranges from ‘inhibition’ (PO43−, CO32−, HCO3−) and ‘no effect’ (SO42−, Cl−) to ‘enhancement’ (NO3−, CH3COO−). The high affinity of MnO2 for O2 and its extremely efficient adsorption of H2O2 and the substrate play key roles in the efficiency of the process. Participation of lattice oxygen from MnO2 in the reaction, whenever the dissolved or adsorbed oxygen is deficient, is an important highlight of the process. Major transient intermediates formed during the process are identified by LC–MS. Combination of sonocatalysis with UV photolysis (sonophotocatalysis) enhances the efficiency of degradation and mineralization of IC.

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Size-Tailored Porous Spheres of Manganese Oxides for Catalytic Oxidation via Peroxymonosulfate Activation

Cited by 69 publications

References 40 publications

Electrodeposited Metal Organic Framework toward Excellent Hydrogen Sensing in an Ionic Liquid

Electrodeposited Metal Organic Framework toward Excellent Hydrogen Sensing in an Ionic Liquid

Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity

MnO2 efficiently removes indigo carmine dyes from polluted water

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