Photocatalytic performance of pyrochar and hydrochar in heterojunction photocatalyst for organic pollutants degradation: Activity comparison and mechanism insight

Qi, Kemin; Wang, Zirun; Xie, Xiaofeng; Wang, Zhaowei

doi:10.1016/j.cej.2023.143424

Cited by 17 publications

(2 citation statements)

References 51 publications

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“…In this experiment, by introducing C-O functional group grafted on the surface of spinel NiAl 2 O 4 to form impurity level, the electron transition from the valence band of spinel NiAl 2 O 4 to its conduction band is effectively promoted. Simultaneously, C-O functional groups also play a role in transferring electrons and promoting the separation of electrons and holes in the reaction system [51]. Based on literature [14] and energy band theory, the photocatalytic mechanism of spinel NiAl 2 O 4 is depicted in figure 13.…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Nano spinel NiAl₂O₄: structure, optical and photocatalytic performance evaluation and optimization

Yu,

Wang,

Xie

et al. 2023

J. Phys.: Condens. Matter

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Four kinds of spinel NiAl2O4 were synthesized by the polyacrylamide gel method using Al2(SO4)3·18H2O and Al(NO3)3·9H2O as aluminum salts and anhydrous NiSO4 and NiSO4·6H2O as nickel salts. The effects of different aluminum salts and nickel salts on the structure, optical and photocatalytic activity of spinel NiAl2O4 were confirmed by various characterizations. There is no NiO impurity in the spinel NiAl2O4 synthesized with Al2(SO4)3·18H2O as aluminum salt, while NiAl2O4, NiO and C–O functional group coexist in the target product with Al(NO3)3·9H2O as aluminum salt, and C–O functional group and NiO inhibits the photocatalytic activity of the system. Based on photocatalytic experiment, response surface methodology and free radical verification experiment, the influence of experimental parameters including synthesis pathway, initial drug concentration, initial pH and catalyst content on the photocatalytic activity of spinel NiAl2O4 and the main active species involved in the reaction were investigated. The degradation percentage of spinel NiAl2O4 synthesized with Al2(SO4)3·18H2O as aluminum salt and NiSO4·6H2O as nickel salt was 86.3% at the initial concentration of 50 mg l−1, pH = 5.33 and catalyst content of 1 g l−1. The mechanism investigation confirmed that the C–O functional group plays the dual role of impurity level and electron transfer in the degradation of tetracycline hydrochloride by spinel NiAl2O4.

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Section: Photocatalytic Mechanismmentioning

confidence: 99%

Nano spinel NiAl₂O₄: structure, optical and photocatalytic performance evaluation and optimization

Yu,

Wang,

Xie

et al. 2023

J. Phys.: Condens. Matter

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“…Li et al [236] rethought the band gap approach by modifying the BC structure instead of inserting nitrogen defects in order to improve electron mobility and to more efficiently disperse titanium oxide particles. Alternatively, BCSCs active under visible light can be produced by using different metal species such as bismuth oxide [237,238], bismuth oxohalides [239][240][241][242], bismuth vanadate [243][244][245], cadmium sulphide [246], or zinc ferrites [247,248]. Even if the utilization of a carbon-negative cost matrix such as BC, photoactive BCSCs remain out of the range for most on-field applications due to the elevated cost and leaching problem due to the impossibility of tightly anchoring the active species on the carbon matrix through solid bonds.…”

Section: Photochemical Based Bc Catalytic Systemsmentioning

confidence: 99%

A Comprehensive Overview on Biochar-Based Materials for Catalytic Applications

Bartoli,

Giorcelli,

Tagliaferro

2023

Catalysts

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The development of heterogeneous catalysts is one of the pillars of modern material science. Among all supports, carbonaceous ones are the most popular due to their high surface area, limited cost, and tunable properties. Nevertheless, materials such as carbon black are produced from oil-derived sources lacking in sustainability. Pyrolytic carbon produced from biomass, known as biochar, could represent a valid solution to combine the sustainability and performance of supported catalysts. In this review, we report a comprehensive overview of the most cutting-edge applications of biochar-based catalysts, providing a reference point for both experts and newcomers. This review will provide a description of all possible applications of biochar-based catalysts, proving their sustainability for the widest range of processes.

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Unravelling superior photodegradation ability and key photoactive structures of hydrochar particle to typical emerging contaminant than corresponding bulk hydrochar from food waste

Guo,

Zhang,

Feng

et al. 2024

Biochar

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Hydrochar from waste biomass is a promising material for removing emerging contaminants (e.g., antibiotics) in water/soil environment. Abundant small-sized hydrochar particles (HPs) with a high content of reactive functional groups and high mobility are easily released into ecosystems through hydrochar applications. However, the photodegradation ability and corresponding structures of HPs are largely unknown, which hinder accurate estimation of the remediation effect of hydrochar in ecosystems. Herein, photodegradation performance of HP towards targeted norfloxacin (NOR, a typical antibiotic) under light irradiation (visible and UV light) were investigated after adsorption processes upon release into soil/water, and its reactive species and photoactive structures were clarified and compared with those of residual bulk hydrochar (BH) comprehensively. The results showed that: (1) photodegradation percentages of HPs were 4.02 and 4.48 times higher than those of BHs under UV and visible light, in which reactive species of both HPs and BHs were ·OH and ·O2−; (2) density functional theory (DFT) results identified that the main photoactive structure of graphitic-N decreased the energy gap (Eg) of HPs, and C=O, COOH groups improved electron donating ability of BHs; (3) well-developed graphitization structure of HP resulted from higher polymerization reaction was an significant photoactive structure involving its superior photodegradation ability relative to that of BH. The distinct heterogeneities of photodegradation ability in HP and BH and underlying photoactive structures provide an in-depth understanding of hydrochar application for removing emerging contaminants in soil/water environment. Identifying photoactive structures is helpful to predict photodegradation ability of hydrochar according to their abundance. Graphical Abstract

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Photocatalytic performance of pyrochar and hydrochar in heterojunction photocatalyst for organic pollutants degradation: Activity comparison and mechanism insight

Cited by 17 publications

References 51 publications

Nano spinel NiAl₂O₄: structure, optical and photocatalytic performance evaluation and optimization

Nano spinel NiAl₂O₄: structure, optical and photocatalytic performance evaluation and optimization

A Comprehensive Overview on Biochar-Based Materials for Catalytic Applications

Unravelling superior photodegradation ability and key photoactive structures of hydrochar particle to typical emerging contaminant than corresponding bulk hydrochar from food waste

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Photocatalytic performance of pyrochar and hydrochar in heterojunction photocatalyst for organic pollutants degradation: Activity comparison and mechanism insight

Cited by 17 publications

References 51 publications

Nano spinel NiAl2O4: structure, optical and photocatalytic performance evaluation and optimization

Nano spinel NiAl2O4: structure, optical and photocatalytic performance evaluation and optimization

A Comprehensive Overview on Biochar-Based Materials for Catalytic Applications

Unravelling superior photodegradation ability and key photoactive structures of hydrochar particle to typical emerging contaminant than corresponding bulk hydrochar from food waste

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Product

Resources

About

Nano spinel NiAl₂O₄: structure, optical and photocatalytic performance evaluation and optimization

Nano spinel NiAl₂O₄: structure, optical and photocatalytic performance evaluation and optimization