scholarly journals Co3O4-Bi2O3 heterojunction; An effective photocatalyst for photodegradation of rhodamine B dye

2021 ◽  
Author(s):  
Muhammad Saeed ◽  
Afifa Baig ◽  
Muhammad Asghar Jamal ◽  
Nadia Akram ◽  
Tanveer Hussain Bokhari
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Rate Constant ◽  
Rhodamine B ◽  
Catalytic Performance ◽  
Coprecipitation Method ◽  
Optimum Ph ◽  
Visible Light Active ◽  
Rhodamine B Dye

Abstract Recently, the research on development of visible-light-active photocatalysts for photodegradation of organic pollutants has got much attention. Therefore, this study reports the synthesis of Co3O4-Bi2O3 heterojunction as visible-light responsive photocatalyst for photodegradation of rhodamine B dye. The Co3O4-Bi2O3 heterojunction was synthesized by coprecipitation method and characterized by XRD, EDS, SEM, TGA and FTIR. The as prepared Co3O4-Bi2O3 heterojunction was utilized as photocatalyst for photodegradation of rhodamine B dye using a 100 mg/L solution. It was observed that Co3O4-Bi2O3 showed best catalytic performance with ~ 92% degradation of rhodamine B dye than Co3O4 and Bi2O3 with 14 and 34% removal of rhodamine B dye, respectively. The rate constant for Co3O4-Bi2O3 catalyzed photodegradation of rhodamine B was 6 times and 3 times higher than rate constant for Co3O4 catalyzed and Bi2O3 catalyzed photodegradation of rhodamine B, respectively. The pH 8 was found as optimum pH for Co3O4-Bi2O3 catalyzed photodegradation of rhodamine B dye.

Heterogeneous photo-Fenton degradation of rhodamine B dye via a high visible-light responsive Bi2WO6 and BiFeO3 heterojunction composites

2019 ◽  
Vol 30 (17) ◽  
pp. 16452-16462 ◽  
Author(s):  
Tianye Wang ◽  
Wei Mao ◽  
Yangsheng Wu ◽  
Yichen Bai ◽  
Yunhang Gao ◽  
...  
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Rhodamine B Dye

Highly efficient and visible light–driven nickel–doped vanadium oxide photocatalyst for degradation of Rhodamine B Dye

2020 ◽  
Vol 10 (7) ◽  
pp. 2365-2374 ◽  
Author(s):  
Muhammad Rafique ◽  
Muhammad Hamza ◽  
Muhammad Shakil ◽  
Muneeb Irshad ◽  
Muhammad Bilal Tahir ◽  
...  
Keyword(s):  
Visible Light ◽  
Vanadium Oxide ◽  
Rhodamine B ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Rhodamine B Dye

scholarly journals BiOCl/TiO2/diatomite composites with enhanced visible-light photocatalytic activity for the degradation of rhodamine B

2019 ◽  
Vol 10 ◽  
pp. 1412-1422 ◽  
Author(s):  
Minlin Ao ◽  
Kun Liu ◽  
Xuekun Tang ◽  
Zishun Li ◽  
Qian Peng ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

A BiOCl/TiO2/diatomite (BTD) composite was synthesized via a modified sol–gel method and precipitation/calcination method for application as a photocatalyst and shows promise for degradation of organic pollutants in wastewater upon visible-light irradiation. In the composite, diatomite was used as a carrier to support a layer of titanium dioxide (TiO2) nanoparticles and bismuth oxychloride (BiOCl) nanosheets. The results show that TiO2 nanoparticles and BiOCl nanosheets uniformly cover the surface of diatomite and bring TiO2 and BiOCl into close proximity. Rhodamine B was used as the target degradation product and visible light (λ > 400 nm) was used as the light source for the evaluation of the photocatalytic properties of the prepared BTD composite. The results show that the catalytic performance of the BTD composite under visible-light irradiation is much higher than that of TiO2 or BiOCl alone. When the molar ratio of BiOCl to TiO2 is 1:1 and the calcination temperature is 400 °C, the composite was found to exhibit the best catalytic effect. Through the study of the photocatalytic mechanism, it is shown that the strong visible-light photocatalytic activity of the BTD composite results mainly from the quick migration of photoelectrons from the conduction band of TiO2/diatomite to the surface of BiOCl, which promotes the separation effect and reduces the recombination rate of the photoelectron–hole pair. Due to the excellent catalytic performance, the BTD composite shows great potential for wide application in the field of sewage treatment driven by solar energy.

A metal-free visible light active photo-electro-Fenton-like cell for organic pollutants degradation

2018 ◽  
Vol 229 ◽  
pp. 211-217 ◽  
Author(s):  
Dongting Yue ◽  
Xufang Qian ◽  
Miao Kan ◽  
Mengyuan Fang ◽  
Jinping Jia ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Metal Free ◽  
Visible Light Active

scholarly journals Improving the photocatalytic activity of nitrogen-doped surface defect TiO2-x nanobelts for degradation of organic pollutants

2020 ◽  
pp. 174751982093867
Author(s):  
Zhen Zhang ◽  
Shao-dong Qin ◽  
Jing-yun Chen ◽  
Jing Li ◽  
Ai-hua Xing
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Organic Pollutants ◽  
Rhodamine B ◽  
Light Absorption ◽  
Surface Defect ◽  
Separation Efficiency ◽  
Visible Light Absorption ◽  
Nitrogen Doped ◽  
N Doping

The synthesis of surface defect TiO2-x nanobelts with excellent visible light absorption is important to reduce costs, increase stability, and improve photocatalytic activity. In this work, we report that nitrogen-doped surface defect TiO2-x nanobelts are synthesized by annealing pristine TiO2 nanobelts in Ar/H2 (95%/5%) atmosphere followed by subsequent heat treatment in NH3 at various temperatures. The aim is to study the effect of the extent of the N-doping amount in the lattice of TiO2-x nanobelts on light absorption and photocatalytic activity. Considering the increase in organic pollutants in wastewater, the photocatalytic activity is measured by degrading rhodamine B (RhB) dye in water. The results demonstrate that the calcination temperature affects the doping level of N, and the b-TiO2-N550 sample exhibits higher photocatalytic performance than that of other samples under visible-light irradiation for the degradation of rhodamine B, which is up to 96.11%. The enhancement is ascribed to the synergistic effect of N-doping and self-doping oxygen vacancy (which extend the visible light absorption) and the separation efficiency of photogenerated carriers, which improves the photocatalytic activity.

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