scholarly journals The Research on the Construction and the Photocatalytic Performance of BiOI/NH2-MIL-125(Ti) Composite

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 24
Author(s):  
Juan Du ◽  
Jiaxin Zhang ◽  
Tingyu Yang ◽  
Renming Liu ◽  
Zhiyi Li ◽  
...  
Keyword(s):  
High Stability ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Solvothermal Method ◽  
Degradation Mechanism ◽  
Active Species ◽  
Absorption Region ◽  
Composite Photocatalyst ◽  
Recombination Efficiency

The BiOI/NH2-MIL-125(Ti) composite photocatalyst with excellent photocatalytic performance was prepared by the solvothermal method. For the BiOI/NH2-MIL-125(Ti) (BNMT) system, the contents of NH2-MIL-125(Ti) in BNMT-4, BNMT-5, BNMT-7, BNMT-9, and BNMT-10 were 4 wt %, 5 wt %, 7 wt %, 9 wt %, and 10 wt %, respectively. XRD, XPS, SEM, and TEM characterizations indicated that BiOI/NH2-MIL-125(Ti) was successfully prepared. Brunauer, Emmett, and Teller (BET) and UV–vis diffuse reflectance spectra photoelectrochemical analysis indicated that BNMT-9 can make the specific surface area and photo absorption region larger than BiOI. In addition, the separation efficiency of photogenerated carriers was improved, and the recombination efficiency was reduced. The degradation percentages of Rhodamine B (RhB) and p-chlorophenol (P-CP) reached 99% and 90% over BNMT-9 under visible light irradiation. Additionally, the catalysts had high stability. The results of the active spices trapping experiments test indicated that h+ was the main active species. The possible degradation mechanism was proposed.

Enhanced Photocatalytic Performance of Sn6SiO8 Nanoparticles and Their Reduced Graphene Oxide (rGO) Nanocomposite

2020 ◽  
Vol 20 (9) ◽  
pp. 5426-5432
Author(s):  
G. Gnanamoorthy ◽  
M. Muthukumaran ◽  
P. Varun Prasath ◽  
V. Karthikeyan ◽  
V. Narayanan ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Dye Degradation ◽  
Hexagonal Phase ◽  
Active Species ◽  
Organic Chemical ◽  
Light Illumination ◽  
Sem Images ◽  
Radical Trapping

Photocatalysts provide excellent potential for the full removal of organic chemical pollutants as an environmentally friendly technology. It has been noted that under UV-visible light irradiation, nanostructured semiconductor metal oxides photocatalysts can degrade different organic pollutants. The Sn6SiO8/rGO nanocomposite was synthesized by a hydrothermal method. The Sn6SiO8 nanoparticles hexagonal phase was confirmed by XRD and functional groups were analyzed by FT-IR spectroscopy. The bandgap of Sn6SiO8 nanoparticles (NPs) and Sn6SiO8/GO composites were found to be 2.7 eV and 2.5 eV, respectively. SEM images of samples showed that the flakes like morphology. This Sn6SiO8/rGO nanocomposite was testing for photocatalytic dye degradation of MG under visible light illumination and excellent response for the catalysts. The enhancement of photocatalytic performance was mainly attributed to the increased light absorption, charge separation efficiency and specific surface area, proved by UV-vis DRS. Further, the radical trapping experiments revealed that holes (h+) and superoxide radicals (·O−2) were the main active species for the degradation of MG, and a possible photocatalytic mechanism was discussed.

scholarly journals Visible-light photocatalytic performance, recovery and degradation mechanism of ternary magnetic Fe3O4/BiOBr/BiOI composite

RSC Advances ◽  
2019 ◽  
Vol 9 (41) ◽  
pp. 23545-23553 ◽  
Author(s):  
Jianhui Li ◽  
Fan Yang ◽  
Quan Zhou ◽  
Lijie Wu ◽  
Wenying Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Degradation Mechanism ◽  
Performance Recovery ◽  
Facile Solvothermal Method ◽  
Magnetic Fe3o4 ◽  
Visible Light Photocatalytic

The ternary magnetic Fe3O4/BiOBr/BiOI (x : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method.

Microwave-Assisted Fabrication of Recyclable CdS/Fe3O4/rGO Photocatalysts to Improve the Photocatalytic Performance Under Visible Light

NANO ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. 1650129 ◽  
Author(s):  
Xinlin Liu ◽  
Yingying Qin ◽  
Mingjun Zhou ◽  
Yongsheng Yan
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Active Species ◽  
Microwave Method ◽  
Composite Photocatalyst ◽  
Microwave Assisted

A unique CdS/Fe3O4/rGO composite photocatalyst is successfully synthesized by the microwave method. It displays promising photocatalytic activity towards the photo-degrading of tetracycline (TC) in aqueous solution, the degradation rate of TC is 69% with adding 0.1[Formula: see text]g CdS/Fe3O4/rGO photocatalyst into 20[Formula: see text]mg/L tetracycline for 2[Formula: see text]h under visible light irradiation. Furthermore, the mechanism was systematically investigated by active species trapping experiment. It can be known that [Formula: see text] the major active species in the photodegradation process and the possible process of charge transfer for CdS/Fe3O4/rGO was proposed based on the experimental results. The as-prepared samples were carefully evaluated by XRD, TEM, XPS, VSM, PL spectra, Raman spectrometer.

Construction of Z-scheme 1D/2D FeV3O8/g-C3N4 composite for ibuprofen degradation: Mechanism insight, theoretical calculation and degradation pathway

2021 ◽  
Author(s):  
Shuai Mao ◽  
Chun Liu ◽  
Mingzhu Xia ◽  
Xuehai Ju ◽  
Fengyun Wang
Keyword(s):  
Theoretical Calculation ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Degradation Mechanism ◽  
Degradation Pathway ◽  
Composite Photocatalyst ◽  
Carrier Recombination

Graphite carbon nitride (g-C3N4) is a common photocatalyst, but it only shows limited photocatalytic performance due to its inherent carrier recombination. Hence, a novel 1D/2D FeV3O8 nanorod/g-C3N4 nanosheets composite photocatalyst...

scholarly journals SnO2-Containing Clinoptilolite as a Composite Photocatalyst for Dyes Removal from Wastewater under Solar Light

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 253 ◽  
Author(s):  
Andraž Šuligoj ◽  
Jelena Pavlović ◽  
Iztok Arčon ◽  
Nevenka Rajić ◽  
Nataša Novak Tušar
Keyword(s):  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Catalytic Properties ◽  
Synergetic Effect ◽  
Ftir Analysis ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
X Ray ◽  
X Ray Absorption ◽  
Dyes Removal

Due to their adsorbent, ion exchange and catalytic properties zeolites are suitable for a variety of applications. We report on the photocatalytic activity of a readily available and inexpensive natural zeolite clinoptilolite (Z) containing SnO2 (Sn-Z). The Sn-Z samples with 3–15 wt. % of Sn were prepared by using a precipitation–deposition method. Powder X-ray diffraction analysis showed that the zeolite structure was unaffected by the introduction of the Sn-phase. Diffuse reflectance UV/VIS spectra of the Sn-Z samples confirmed the presence of SnO2 and X-Ray absorption spectroscopy analyses suggested that the SnO2 particles mainly resided on the surface of the clinoptilolite, while ATR-FTIR analysis gave some clues that part of the SnO2 phase was incorporated in the pores of the zeolite. The presence of SnO2 in Sn-Z increased both adsorption capacity and photocatalytic performance which could be partially explained by higher surface area and partially with an increased negative potential of the surface. Adsorption and total degradation of methylene blue (MB) for the Sn-Z with the highest amount of Sn (15 wt.%) was about 30% and 45%, respectively, suggesting a synergetic effect between SnO2 and the clinoptilolite lattice. Reusability tests showed that these catalysts present a promising material for water purification.

Novel RGO and Concave Cube Cu2O Co-Modified BiVO4 Nanosheets with Enhanced Photocatalytic and Surface Adsorption Performances of Tetracycline

NANO ◽  
2019 ◽  
Vol 14 (02) ◽  
pp. 1950015 ◽  
Author(s):  
Xin Gao ◽  
Changchang Ma ◽  
Wei Ma ◽  
Rongru Chen ◽  
Yang Liu ◽  
...  
Keyword(s):  
Organic Contaminants ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Narrow Band ◽  
Photogenerated Electron ◽  
High Adsorption ◽  
Electron Hole ◽  
Composite Photocatalyst ◽  
Radical Trapping ◽  
Spin Resonance

A novel ternary Cu2O/BiVO4/RGO photocatalyst is successfully constructed by hydrothermal and evaporation-induced method, and it exhibits superior photocatalytic performance for degradation tetracycline (TC). Meanwhile, the visible light absorption range of composite photocatalyst is effectively broadened by the formation of heterojunction with narrow band gap semiconductor Cu2O. And the separation efficiency of the photogenerated electron–hole pairs is significantly enhanced by the synergistic effect of Cu2O and RGO. More importantly, the adsorption of TC by ternary Cu2O/BiVO4/RGO possesses high adsorption capacity, which is 23.73 times higher than that of pure BiVO4. Additionally, the possible reaction mechanism is clearly revealed by radical trapping experiment, electron spin-resonance (ESR) spectroscopy. This work provides a new insight to design a photocatalyst with excellent adsorption to remove organic contaminants in water.

Hierarchical core–shell SiO2@PDA@BiOBr microspheres with enhanced visible-light-driven photocatalytic performance

2017 ◽  
Vol 46 (34) ◽  
pp. 11451-11458 ◽  
Author(s):  
Shuai-Ru Zhu ◽  
Qi Qi ◽  
Wen-Na Zhao ◽  
Meng-Ke Wu ◽  
Yuan Fang ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Superior Performance ◽  
Core Shell ◽  
Composite Photocatalyst ◽  
Visible Light Driven ◽  
Core Shell Structure ◽  
Facile Solvothermal Method

The SiO2@PDA@BiOBr composite photocatalyst with a hierarchical core–shell structure was prepared by a facile solvothermal method, and the catalyst shows a superior performance on photodegradation of Rhodamine B under visible light irradiation.

Photocatalytic degradation of ofloxacin by ZnO/CsxWO3 composite synthesized by two-step method: A kinetic study

2019 ◽  
Vol 12 (05) ◽  
pp. 1950068 ◽  
Author(s):  
Wenwen Ning ◽  
Zhihuan Zhao ◽  
Honghong Chang ◽  
Zhanyong Gu ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Active Species ◽  
Step Method ◽  
Full Spectrum ◽  
First Order ◽  
First Order Kinetics ◽  
Photogenerated Electrons ◽  
Prepared Composite

The composite of ZnO/CsxWO3 with heterojunction was prepared by a two-step solvothermal method and the degradation of ofloxacin solution under full-spectrum light irradiation was carried out to evaluate the performance. The composites were characterized by XRD, SEM, EDS and UV-Vis-NIR reflectance. The result shows that the prepared composite has an ideal optical absorption in the spectral region of 200–2500[Formula: see text]nm and higher photocatalytic performance compared with ZnO and CsxWO3. Moreover, [Formula: see text], [Formula: see text]OH and [Formula: see text][Formula: see text] radicals are determined to be the active species. It is suggested that the heterojunction between ZnO and CsxWO3 for ZnO/CsxWO3 composite is important for improving the charge separation and thus restraining the recombination of photogenerated electrons and holes. Photodegradation of ofloxacin catalyzed by ZnO/CsxWO3 followed the first-order kinetics and the degradation rate of ZnO/2CsxWO3 was about two times higher than those of CsxWO3 and ZnO.

scholarly journals Simple Fabrication of Visible Light-Responsive Bi-BiOBr/BiPO4 Heterostructure with Enhanced Photocatalytic Activity

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Chunbei Wu ◽  
Chuxin Zhou ◽  
Yuanyuan Chen ◽  
Zhigang Peng ◽  
Jun Yang ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Photogenerated Electron ◽  
Active Species ◽  
Electron Hole ◽  
Intimate Contact ◽  
Heterojunction Structure ◽  
Degradation Rate Constant ◽  
Spr Effect

A Bi-BiOBr/BiPO4 heterojunction structure was successfully synthesized via a two-step solvothermal method with ethylene glycol as a reducer. Little BiPO4 irregular polyhedrons and little metal Bi spherical nanoparticles were uniformly dispersed on the surface of BiOBr nanosheets with intimate contact and formed a heterojunction structure between BiPO4 and BiOBr. It was found that Bi-BiOBr/BiPO4 had a significant improvement in photocatalytic performance for RhB degradation compared to bare BiOBr and BiPO4. The photocatalytic degradation rate constant of 0.2-Bi/BiOBr/BiPO4 was 1.44 h-1, which was 3.8 times and 14.2 times more than that of bare BiOBr and BiPO4, respectively. This is attributed to the formation of a ternary heterojunction, which benefits the separation of photogenerated electron-hole pairs. Furthermore, with the introduction of metal Bi, the SPR effect of metal Bi can effectively improve the absorption ability of Bi-BiOBr/BiPO4 photocatalyst, resulting in enhanced photoactivity. In this work, the mechanism of photocatalytic degradation was studied by using the photochemical technique and the capture experiment of active species, and it was revealed that h+ and ⋅O2- played a major role in the photocatalytic process.

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