Novel polyoxometalate@g-C3N4 hybrid photocatalysts for degradation of dyes and phenolics

He, Jijiang; Sun, Hongqi; Indrawirawan, Stacey; Duan, Xiaoguang; Wang, Shaobin

doi:10.1016/j.jcis.2015.06.003

Cited by 79 publications

(29 citation statements)

References 40 publications

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“…The polymer is composed of carbon and nitrogen, both of which are earth-abundant elements. Meanwhile, subsequent studies have shown that GCN-based photocatalysts are effective for various applications, such as contaminant decompositions [14,15], hydrogen evolution reactions (HER) [16][17][18], oxygen evolution reactions (OER) [19], CO 2 reduction [20], bioimaging and electricity generation. Yet, the low electrical conduction of the pristine GCN and the rapid photoelectron depletion cause the undesirable photon harvesting [21].…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…In order to eliminate organic dyes from waste water, several methods including adsorption (Haque et al, 2011 ; Wang et al, 2016 ; Yan et al, 2016 ), photo-degradation (Kumar et al, 2014 ; He et al, 2015 ; Xin et al, 2017 ), chemical oxidation (Osugi et al, 2009 ), and biological treatment (Zhang et al, 2014 ) have been used. Compared to others, adsorption is considered as a most effective method due to its simple design and operation, high efficiency, and economy (Haque et al, 2011 ).…”

Section: Introductionmentioning

confidence: 99%

A Polyoxoniobate/g-C3N4 Nanoporous Material with High Adsorption Capacity of Methylene Blue from Aqueous Solution

Gan

Shi

et al. 2018

Front. Chem.

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A polyoxoniobate/g-C3N4 nanoporous material with functional groups has been synthesized by using carbon nitride (g-C3N4) and hexaniobate (K8Nb6O19·10H2O, abbreviated as NbO) as precursors. The structure and compositions of the as-prepared nanomaterials were characterized by XRD, FT-IR, FESEM, TEM, and XPS. These two kinds of materials interact with each other forming a hybrid composite, which can be used as an adsorbent for removing a cationic dye (methylene blue, MB) from wastewater with excellent adsorption capacity. Furthermore, parameters that can affect adsorption process including initial dye concentration, pH and temperature were investigated by bath adsorption experiments. The results indicated that the maximum adsorption capacity of NbO/g-C3N4 can reach up to 373.1 mg g−1. Moreover, the equilibrium experiment data fitted Langmuir isotherm well and the adsorption kinetics showed that the pseudo second order model can satisfyingly described MB adsorption kinetics. The thermodynamic analysis indicated that the adsorption was endothermic and spontaneous.

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“…PMo 12 @ g‐C 3 N 4 showed higher surface area and pore volume leading to the better photocatalytic activity under UV‐vis light irradiation. The energy levels of conduction and valence bands of POMs and g‐C 3 N 4 were considered an effective factor in the improved photocatalytic performance …”

Section: Poms and Their Composites As Photocatalystmentioning

confidence: 99%

Polyoxometalates and Their Composites as Photocatalysts for Organic Pollutants Degradation in Aqueous Media—A Review

Dehghani

Aber

Mahdizadeh

2018

CLEAN Soil Air Water

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Polyoxometalates (POMs), eco‐friendly solid acids, are polyatomic anions containing transition metal (group 5 or group 6) oxyanions linked together through shared oxygen atoms. First, the structure, classification, synthesis, non‐photocatalytic applications, and their photocatalytic properties and applications are presented. POMs are very interesting due to their unique and remarkable characteristics. One of the most attractive characteristics of POMs is their activity as an electron relay, that is, they can undergo stepwise multi‐electron redox reactions while their construction remains intact. Based on this characteristic, POMs have been widely used as photooxidation catalysts for organic and inorganic contaminants removal. According to the literature, POMs are useful homogeneous photocatalysts for the mineralization of dyes, phenol and its derivatives, chloroacetic acids, and pesticides and wood pulp bleaching. Applications of POMs have been limited because of their high solubility in water. Immobilization and solidification of POMs using different methods and various supports for making them reusable are studied in this review. Varieties of composites of POMs are synthesized to make them photorespond to the visible light region.

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Novel polyoxometalate@g-C3N4 hybrid photocatalysts for degradation of dyes and phenolics

Cited by 79 publications

References 40 publications

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

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

A Polyoxoniobate/g-C3N4 Nanoporous Material with High Adsorption Capacity of Methylene Blue from Aqueous Solution

Polyoxometalates and Their Composites as Photocatalysts for Organic Pollutants Degradation in Aqueous Media—A Review

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