scholarly journals Photocatalytic Degradation of Composites With Magnesium Aluminum Hydrotalcite Derived Metal Oxides and g-C3N4

2021 ◽  
Author(s):  
Mingwei Yu ◽  
Lianhong Zhang ◽  
Jie Wen ◽  
Hui Zhang ◽  
Faping Liu ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Active Sites ◽  
Degradation Rate ◽  
Degradation Mechanism ◽  
Radical Scavenging ◽  
The Face ◽  
Co Precipitation ◽  
Photocatalytic Degradation Mechanism

Abstract The remove of the organic pollutants in water plays an important role on the environmental protection, thus photocatalysis, as an effective method, has been attained much attention to deal with this problem. In this paper, a composite of g-C3N4 and Mg-Al hydrotalcite derived metal oxides was prepared to degrade these organic pollutants by simple calcination and co-precipitation methods. And Mg-Al hydrotalcite derived metal oxides were successfully coated on the surface of g-C3N4. The photocatalytic degradation rate of methylene blue reached 97.3% within 1h under visible light, and the degradation rate constant was 0.0432min-1, which is 3.6 times that of g-C3N4. In the recycling process of the catalyst, the good stability of photocatalytic degradation was found. Though characterization analysis, more active sites are exposed to absorb more organic pollutants on the mater surface in the presence of the interinserted and coated structures of composite materials, and the "face to face" contact structure between 2D materials is formed to promote the separation of photogenerated carriers. In addition, the photocatalytic degradation mechanism of the catalyst was explained by free radical scavenging experiment. The material provides an effective method for removing organic pollutants in water, and has broad application prospects.

scholarly journals Bridging and synergistic effect of the pyrochlore like Bi2Zr2O7 structure with robust CdCuS solid solution for durable photocatalytic removal of the organic pollutants

RSC Advances ◽  
2020 ◽  
Vol 10 (15) ◽  
pp. 8880-8894 ◽  
Author(s):  
Venkatesan Jayaraman ◽  
Chinnadurai Ayappan ◽  
Baskaran Palanivel ◽  
Alagiri Mani
Keyword(s):  
Solid Solution ◽  
Synergistic Effect ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Degradation Mechanism ◽  
Photocatalytic Removal ◽  
Photocatalytic Degradation Mechanism

Photocatalytic degradation mechanism for CdCuS solid solution supported pyrochlore like Bi2Zr2O7.

Enhanced Photocatalytic Activity of Agbr Photocatalyst via Constructing Heterogeneous Junctions With Reduced Graphene

2021 ◽  
Author(s):  
Tongtong Zhang ◽  
Qi Yin ◽  
Menghan Zhang ◽  
Siyu Zhang ◽  
Yanning Shao ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Contaminants ◽  
Degradation Mechanism ◽  
Silver Bromide ◽  
Active Components ◽  
Transient Photocurrent ◽  
Photogenerated Electrons ◽  
Reduced Graphene ◽  
Photocatalytic Activities ◽  
Photocatalytic Degradation Mechanism

Abstract A series of rGO/AgBr heterojunction photocatalysts were fabricated through a facile solvothermal method. The rGO/AgBr heterostructures were characterized by XPS, XRD, UV-Vis DRS, SEM, TEM, PL and the transient photocurrent responses. The XRD, SEM, XPS and TEM analyzes indicated that the graphene and silver bromide were successfully compounded without other impurities. The UV-Vis DRS exhibited that the composites have better optical properties than pure silver bromide. The PL and the transient photocurrent responses demonstrated that the addition of graphene significantly promotes the separation of photogenerated electrons and holes. Subsequently, the photocatalytic activities of rGO/AgBr composites were studied by degrading Rhodamine B (RhB). It turned out that the degradation rate of RhB by the rGO/AgBr heterojunction photocatalysts were significantly higher than that by pure AgBr. What’s more, to study the photocatalytic degradation mechanism of RhB by rGO/AgBr heterostructures, the trapping experiments were used to identify the main active components. This work confirmed that the photocatalytic degradation performance of the catalyst was greatly improved after doping graphene, which provided certain data support for degradation of organic contaminants in water.

scholarly journals Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 604 ◽  
Author(s):  
Robert Arthur ◽  
John Ahern ◽  
Howard Patterson
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Radical Scavenging ◽  
Flow Chemistry ◽  
Active Species ◽  
Effective Strategies ◽  
Degradation Of Dyes ◽  
Bismuth Oxyhalides ◽  
Electron Holes

Bismuth oxyhalides have recently gained attention for their promise as photocatalysts. Due to their layered structure, these materials present fascinating and highly desirable physicochemical properties including visible light photocatalytic capability and improved charge separation. While bismuth oxyhalides have been rigorously evaluated for the photocatalytic degradation of dyes and many synthesis strategies have been employed to enhance this property, relatively little work has been done to test them against pharmaceuticals and pesticides. These persistent organic pollutants are identified as emerging concerns by the EPA and effective strategies must be developed to combat them. Here, we review recent work directed at characterizing the nature of the interactions between bismuth oxyhalides and persistent organic pollutants using techniques including LC-MS/MS for the determination of photocatalytic degradation intermediates and radical scavenging to determine active species during photocatalytic degradation. The reported investigations indicate that the high activity of bismuth oxyhalides for the breakdown of persistent organic pollutants from water can be largely attributed to the strong oxidizing power of electron holes in the valence band. Unlike conventional catalysts like TiO2, these catalysts can also function in ambient solar conditions. This suggests a much wider potential use for these materials as green catalysts for industrial photocatalytic transformation, particularly in flow chemistry applications.

scholarly journals Enhancement of the photocatalytic synchronous removal of Cr(vi) and RhB over RP-modified flower-like SnS2

2020 ◽  
Vol 2 (9) ◽  
pp. 4220-4228
Author(s):  
Xue Bai ◽  
Yanyan Du ◽  
Wenhua Xue ◽  
Xiaoyun Hu ◽  
Jun Fan ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Mechanism ◽  
Photocatalytic Degradation Mechanism ◽  
First Time

RP/SnS2 nanocomposite as photocatalyst was fabricated for the first time, exhibiting remarkable activity to synchronous removal of Cr(vi) and RhB. The possible pathway of carriers and photocatalytic degradation mechanism was systematically studied.

Mechanism of CeVO4/TiO2 Photocatalytic Degradation of VOCs under Visible Light Irradiation: Electrochemical, Photoluminescence and Active Oxygen Species Study

2012 ◽  
Vol 217-219 ◽  
pp. 853-856 ◽  
Author(s):  
Han Jie Huang ◽  
Wen Long She ◽  
Ling Wen Yang
Keyword(s):  
Reactive Oxygen Species ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Gas Phase ◽  
Degradation Mechanism ◽  
Active Oxygen Species ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Composite Photocatalyst ◽  
Photocatalytic Degradation Mechanism

In this paper, CeVO4/TiO2 composite photocatalyst has been characterized by photoelectrochemical and reactive oxygen species trap techniques to reveal the mechanism for photocatalytic degradation of VOCs in gas-phase. Based on the measurement of flatband of the samples and the detection of reactive oxygen species, a visible light-induced photocatalytic degradation mechanism of VOCs on CeVO4/TiO2 is proposed.

Photocatalytic removal of taste and odour compounds for drinking water treatment

2009 ◽  
Vol 9 (5) ◽  
pp. 477-483 ◽  
Author(s):  
H. Tran ◽  
G. M. Evans ◽  
Y. Yan ◽  
A. V. Nguyen
Keyword(s):  
Drinking Water ◽  
Sodium Bicarbonate ◽  
Photocatalytic Degradation ◽  
Rate Constants ◽  
Degradation Rate ◽  
Degradation Mechanism ◽  
Drinking Water Treatment ◽  
Degradation Process ◽  
Negative Effects ◽  
Reaction Rate Constants

Photocatalytic degradation of geosmin and 2-methylisoborneol (MIB), which are two taste and odour compounds commonly found in drinking water supply sources, was investigated using an immobilised TiO2 photoreactor. It was found that the degradation of geosmin and MIB followed similar pseudo-first-order kinetics with reaction rate constants being approximately 0.025 min−1 for typical geosmin and MIB concentrations of 250 and 500 ng/L. The normalised formal quantum efficiency was calculated to be in the range of 162–182 L/mol. Influence of additives (i.e. sodium bicarbonate and alcohols) on the degradation process was also investigated. It was found that there was a small reduction in the degradation rate constants of geosmin and MIB with increasing sodium bicarbonate concentration. At 50 mg/L sodium bicarbonate the degradation rate constants decreased by approximately 5%. Similarly, for methanol and ethanol concentrations up to 35 and 50 mg/L, respectively, these constants were found to also decrease. While addition of sodium bicarbonate and alcohols was seen to have relatively small negative effects on the photocatalytic degradation performance, the magnitude of their influence was consistent with the hypothesis that the degradation mechanism of geosmin and MIB was predominately that of attack involving HO∙ radicals.

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