Construction of Ag3PO4/SnO2 Heterojunction on Carbon Cloth with Enhanced Visible Light Photocatalytic Degradation

In this study, the Ag3PO4/SnO2 heterojunction on carbon cloth (Ag3PO4/SnO2/CC) was successfully fabricated via a facile two-step process. The results showed that the Ag3PO4/SnO2/CC heterojunction exhibited a remarkable photocatalytic performance for the degradation of Rhodamine B (RhB) and methylene blue (MB), under visible light irradiation. The calculated k values for the degradation of RhB and MB over Ag3PO4/SnO2/CC are 0.04716 min−1 and 0.04916 min−1, which are higher than those calculated for the reactions over Ag3PO4/SnO2, Ag3PO4/CC and SnO2/CC, respectively. The enhanced photocatalytic activity could mainly be attributed to the improved separation efficiency of photogenerated electron-hole pairs, after the formation of the Ag3PO4/SnO2/CC heterojunction. Moreover, carbon cloth with a large specific surface area and excellent conductivity was used as the substrate, which helped to increase the contact area of dye solution with photocatalysts and the rapid transfer of photogenerated electrons. Notably, when compared with the powder catalyst, the catalysts supported on carbon cloth are easier to quickly recycle from the pollutant solution, thereby reducing the probability of recontamination.

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Surface oxygen vacancy and defect engineering of WO3 for improved visible light photocatalytic performance

Catalysis Science & Technology ◽

10.1039/c8cy00994e ◽

2018 ◽

Vol 8 (17) ◽

pp. 4399-4406 ◽

Cited By ~ 35

Author(s):

Qi Liu ◽

Fengjiao Wang ◽

Huaxiang Lin ◽

Yanyu Xie ◽

Na Tong ◽

...

Keyword(s):

Oxygen Vacancy ◽

Visible Light ◽

Photocatalytic Performance ◽

Photogenerated Electron ◽

Vacancy Defect ◽

Surface Oxygen ◽

Defect Engineering ◽

Electron Hole ◽

Surface Oxygen Vacancy ◽

Visible Light Photocatalytic

Compared to the pristine WO3, the oxygen vacancy defect levels of the sub-stoichiometric WO3−X narrow the bandgap and promote the separation of photogenerated electron–hole pairs.

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Synthesis and Visible-Light Photocatalytic N2/H2O to Ammonia of Au@CDs Core-Shell Nanocatalyst

NANO ◽

10.1142/s1793292020501039 ◽

2020 ◽

Vol 15 (08) ◽

pp. 2050103

Author(s):

Ying-dan Cui ◽

Halidan Maimaiti ◽

Shi-Xin Wang ◽

Bo Xu ◽

Hai-zhen Zhang ◽

...

Keyword(s):

Visible Light ◽

Ammonia Synthesis ◽

Catalyst Surface ◽

Photogenerated Electron ◽

Material Structure ◽

Core Shell ◽

Electron Hole ◽

Photogenerated Electrons ◽

Adsorption And Dissociation ◽

Visible Light Photocatalytic

Synthesis and visible-light photocatalytic N2/H2O to ammonia at atmospheric pressure and room temperature is considered to be the most ideal ammonia synthesis technology. In this study, coal-based carbon dots (CDs) were prepared by H2O2 oxidation method using cheap and ubiquitous coal as the carbon source. Then the gold sol was connected to CDs to obtain a core-shell structure photocatalyst Au@CDs by sodium borohydride (NaBH4) reduction method. While characterizing the material structure, the photocatalytic N2/H2O to ammonia performance of Au@CDs was investigated. The results show that the introduction of CDs in Au @CDs photocatalysts can not only improve the performance of the catalyst to excite carriers in visible light, but also inhibit the recombination of photogenerated electron-hole pairs, promote the charge transport ability and make photogenerated electrons and holes move smoothly to the catalyst surface. Meanwhile, the adsorption and dissociation capacity of N2 on the catalyst surface can be improved, thereby the photocatalytic N2/H2O ammonia synthesis reaction of Au@CDs can proceed smoothly.

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Synthesis and High Visible Light Photocatalytic Activity of Ternary Brookite-g-C3N4-BiOBr Composite

NANO ◽

10.1142/s1793292020500459 ◽

2020 ◽

Vol 15 (04) ◽

pp. 2050045

Author(s):

Ning Liu ◽

Huidong Xie ◽

Jie Li ◽

Yajuan Zhao ◽

Na Wang

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Rhodamine B ◽

Separation Efficiency ◽

Photogenerated Electron ◽

Photocurrent Density ◽

Electron Hole ◽

Degradation Ratio ◽

Loading Amount ◽

Visible Light Photocatalytic

Brookite TiO2 was synthesized by a hydrothermal method, g-C3N4 was prepared by a pyrolytic method, brookite/g-C3N4 composites were prepared by a calcining method, and brookite/g-C3N4/BiOBr ternary composites were prepared by loading BiOBr on the surface of brookite/g-C3N4. XRD and XPS analysis of the composites confirmed the formation of brookite TiO2/g-C3N4/BiOBr. SEM and TEM results confirmed the as-prepared composites were nanosized. The optimum loading amount of BiOBr was 30%. The photocatalytic results showed that the brookite/g-C3N4/30%BiOBr composites degraded rhodamine B completely under visible light irradiation. The degradation ratio of brookite/g-C3N4/30%BiOBr toward rhodamine B was nearly 100% for 2[Formula: see text]h, which was much higher than that of brookite TiO2 and brookite/g-C3N4 catalysts. The reason for the improvement of photocatalytic activity might be because the composites promoted the formation of superoxide radicals and the separation efficiency of photogenerated electron-hole pairs. The photocurrent density of the brookite/g-C3N4/30%BiOBr was about 10 times higher than that of pure brookite. In addition, the brookite/g-C3N4/BiOBr showed a good repeatablity of photocatalysis.

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A metal-free 3C-SiC/g-C3N4 composite with enhanced visible light photocatalytic activity

RSC Advances ◽

10.1039/c7ra06497g ◽

2017 ◽

Vol 7 (63) ◽

pp. 40028-40033 ◽

Cited By ~ 10

Author(s):

Hao Xu ◽

Zhixing Gan ◽

Weiping Zhou ◽

Zuoming Ding ◽

Xiaowei Zhang

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Light Absorption ◽

Carbon Nitride ◽

Photocatalytic Performance ◽

Photogenerated Electron ◽

Electron Hole ◽

Visible Light Absorption ◽

Metal Free ◽

Visible Light Photocatalytic

Insufficient visible light absorption and fast recombination of the photogenerated electron–hole pairs have seriously hampered the photocatalytic performance of graphitic carbon nitride (g-C3N4) up to now.

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Enhanced visible light photocatalytic activity of AgI/TiO2 composite fabricated by a grinding method

Water Quality Research Journal ◽

10.2166/wqrj.2019.037 ◽

2019 ◽

Vol 54 (3) ◽

pp. 257-264

Author(s):

Jin Xu ◽

Dasheng Gao ◽

Shuang Cui ◽

Xiaohua Wang ◽

Ningning Liu

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Active Sites ◽

Photocatalytic Performance ◽

Photogenerated Electron ◽

Active Species ◽

Electron Hole ◽

Grinding Method ◽

The Stability ◽

Visible Light Photocatalytic

Abstract Through a simple grinding method, AgI/TiO2 composites were successfully synthesized. The as-prepared AgI/TiO2 composites were used as photocatalysts for Rhodamine B (RhB) degradation under visible light irradiation and exhibited excellent photocatalytic performance. In the presence of composites, almost 100% RhB was decomposed after 60 min. The photocatalytic activity of AgI/TiO2-0.5 composite was optimal, which was 9.5 times higher than that of pristine TiO2, and 15.6 times higher than that of AgI. Moreover, experimental results revealed that the improved photocatalytic activity was not only ascribed to the loading AgI but also resulted from the method that enabled the exposure of more active sites in the composites. In addition, the intimate interfacial contact obtained by this method could also promote the efficient separation of photogenerated electron-hole pairs. Moreover, the possible photocatalytic active species and the stability of the photocatalyst were investigated in detail.

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Reduced graphene oxide encapsulated Cu2O with controlled crystallographic facets for enhanced visible-light photocatalytic degradation

Functional Materials Letters ◽

10.1142/s1793604717500345 ◽

2017 ◽

Vol 10 (04) ◽

pp. 1750034 ◽

Cited By ~ 3

Author(s):

Guosong Wu ◽

Qiuping Shen ◽

Houlin Yu ◽

Tingyu Zhao ◽

Congda Lu ◽

...

Keyword(s):

Graphene Oxide ◽

Visible Light ◽

Reduced Graphene Oxide ◽

Photocatalytic Performance ◽

Photogenerated Electron ◽

Electron Hole ◽

Photogenerated Electrons ◽

Reduced Graphene ◽

One Step ◽

Crystallographic Facets

The Cu2O/reduced graphene oxide (Cu2O/rGO) composites with effective crystallographic facet controlling of Cu2O crystals were fabricated through a simple one-step wet chemistry method. The crystallographic facet-dependent photocatalytic performance of Cu2O was confirmed, favoring the cuboctahedral Cu2O with {100} and {111} facets and a better photocatalytic activity when compared to cubic and octahedral ones. This was attributed to the slight difference of surface energy between {100} and {111} facets which served as a driving force to promote the separation of photogenerated electron–hole pairs. Moreover, the introduction of two-dimensional rGO sheets could accelerate the transfer of photogenerated electrons from Cu2O to rGO, which further promoted the separation of photogenerated electron–hole pairs and the degradation of methyl orange (MO) under visible-light irradiation. The cuboctahedral Cu2O/rGO composite exhibited a superb photocatalytic performance with the degradation percentage of MO about 97.6% after one periodic photocatalysis due to the synergistic effect of cuboctahedral Cu2O and rGO sheets, foreboding its potential application as photocatalyst.

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Enhanced Visible-Light Photocatalytic Performance of SAPO-5-Based g-C3N4 Composite for Rhodamine B (RhB) Degradation

Materials ◽

10.3390/ma12233948 ◽

2019 ◽

Vol 12 (23) ◽

pp. 3948

Author(s):

Lingfang Qiu ◽

Zhiwei Zhou ◽

Mengfan Ma ◽

Ping Li ◽

Jinyong Lu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Redox Reactions ◽

Photocatalytic Performance ◽

Dye Degradation ◽

Thermal Polymerization ◽

Light Illumination ◽

Electron Hole ◽

Visible Light Illumination ◽

Visible Light Photocatalytic

Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4 composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4 is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4 composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1 to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4 to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4 efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4 and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4 efficiently, but also broadens the application of SAPOs in the photocatalytic field.

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Preparation and Photocatalytic Performance for Degradation of Rhodamine B of AgPt/Bi4Ti3O12 Composites

Nanomaterials ◽

10.3390/nano10112206 ◽

2020 ◽

Vol 10 (11) ◽

pp. 2206

Author(s):

Gaoqian Yuan ◽

Gen Zhang ◽

Kezhuo Li ◽

Faliang Li ◽

Yunbo Cao ◽

...

Keyword(s):

Visible Light ◽

Noble Metal ◽

Rhodamine B ◽

Photocatalytic Performance ◽

Bimetallic Nanoparticles ◽

Resonance Effect ◽

Visible Region ◽

Photogenerated Electron ◽

Pt Nanoparticles ◽

Electron Hole

Loading a noble metal on Bi4Ti3O12 could enable the formation of the Schottky barrier at the interface between the former and the latter, which causes electrons to be trapped and inhibits the recombination of photoelectrons and photoholes. In this paper, AgPt/Bi4Ti3O12 composite photocatalysts were prepared using the photoreduction method, and the effects of the type and content of noble metal on the photocatalytic performance of the catalysts were investigated. The photocatalytic degradation of rhodamine B (RhB) showed that the loading of AgPt bimetallic nanoparticles significantly improved the catalytic performance of Bi4Ti3O12. When 0.10 wt% noble metal was loaded, the degradation rate for RhB of Ag0.7Pt0.3/Bi4Ti3O12 was 0.027 min−1, which was respectively about 2, 1.7 and 3.7 times as that of Ag/Bi4Ti3O12, Pt/Bi3Ti4O12 and Bi4Ti3O12. The reasons may be attributed as follows: (i) the utilization of visible light was enhanced due to the surface plasmon resonance effect of Ag and Pt in the visible region; (ii) Ag nanoparticles mainly acted as electron acceptors to restrain the recombination of photogenerated electron-hole pairs under visible light irradiation; and (iii) Pt nanoparticles acted as electron cocatalysts to further suppress the recombination of photogenerated electron-hole pairs. The photocatalytic performance of Ag0.7Pt0.3/Bi4Ti3O12 was superior to that of Ag/Bi4Ti3O12 and Pt/Bi3Ti4O12 owing to the synergistic effect between Ag and Pt nanoparticles.

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