scholarly journals Effects of Sintering Temperature on Crystallinity, Morphology, and Photocatalytic Activity of Bi2O3

2019 ◽  
Vol 7 (12) ◽  
Author(s):  
Mukholit, Heri Sutanto ◽  
Ngurah Ayu Ketut Umiati ◽  
Eko Hidayanto
Keyword(s):  
Photocatalytic Activity ◽  
Crystallite Size ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Sintering Temperature ◽  
Photocatalytic Properties ◽  
Precipitation Method ◽  
Temperature Variations ◽  
Photocatalytic Activities ◽  
Degradation Tests

Bi2O3 has successfully been synthesized using precipitation method with sintering temperature variations of 400oC, 450o C, 500o C, 550o C, and 600o C. Crystallinity property of resulting Bi2O3 powder has also been tested with XRD and morphology properties were tested with SEM. Meanwhile, photocatalytic properties were tested by using it to degrade Rhodamine B under sunlight. Results of XRD tests show that differences in sintering temperature affect crystallite size. Increases in sintering temperature between 400o C and 500o C result in greater crystallite size, whereas sintering temperature between 550o C and 600oC result in smaller crystallite size. Results of SEM tests show that resulting Bi2O3 has rod-like structure, While results of degradation tests show that increases in sintering temperature enhances photocatalytic activities of Bi2O3, as evident with Bi2O3 undergoing sintering at 600oC was able to degrade Rhodamine B with 56.74% effectiveness and degradation rate of 0.007 ppm/min.

The effects of solvent viscosity on the morphology and photocatalytic activity of BiOBr catalysts

2021 ◽  
Author(s):  
Fengjuan Ge ◽  
Jie Zhu ◽  
Yan Xu ◽  
Jing Li ◽  
Xueyang Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Surface Area ◽  
Rhodamine B ◽  
Synthesis Method ◽  
Degradation Process ◽  
High Viscosity ◽  
Precipitation Method ◽  
Glycerol Solution ◽  
Solvent Viscosity ◽  
Degradation Tests

BiOBr photocatalysts were prepared by changing the solvent and synthesis method. SEM, XRD and BET characterization shows that the sample prepared in high-viscosity solution by precipitation method has tremella-like microstructure, with smaller size and higher surface area. Among them, the BiOBr prepared in glycerol solution (GR-P) has the highest surface area of 113.8 m2⋅[Formula: see text]. XRD also indicates that the GR-P has much more exposed (110) facets than other samples. The Rhodamine B degradation tests show that the GR-P has the best activity on both deethylation and aromatic ring destruction steps, indicating that the exposed (110) facets promote the degradation process.

Preparation of Bi1-xLaxVO4 and its Photocatalytic Degradation on Rhodamine B

2016 ◽  
Vol 852 ◽  
pp. 1473-1476
Author(s):  
Yan Ding ◽  
Liang Fang Fu ◽  
Yu Huan Wang ◽  
Liang Chao Li ◽  
Juan Bi Li
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Light Sensitivity ◽  
Structure Morphology ◽  
Photocatalytic Activities ◽  
Testing Techniques ◽  
Composition Structure

A series of photocatalyst Bi1-xLaxVO4 (0.1, 0.3, 0.5, 0.7) powders were prepared by hydrothermal method. The composition, structure, morphology and photocatalytic activity of the samples were researched by means of modern testing techniques. Bi1-xLaxVO4 showed excellent visible-light sensitivity and photocatalytic activities. The degradation rate of sample with x = 0.5 on rhodamine B reached 90 %, which was much higher than that of pure BiVO4.

scholarly journals The Starting Material Concentration Dependence of Ag3PO4 Synthesis for Rhodamine B Photodegradation under Visible Light Irradiation

2020 ◽  
Vol 6 (1) ◽  
pp. 1-9
Author(s):  
Febiyanto Febiyanto ◽  
Uyi Sulaeman
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Visible Region ◽  
Starting Material ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Photocatalytic Activities ◽  
Facet Plane ◽  
Co Precipitation

Synthesis of Ag3PO4 photocatalyst under the varied concentrations of AgNO3 and Na2HPO4·12H2O as starting material has been successfully synthesized using the co-precipitation method. The concentration of AgNO3 is 0.1; 0.5; 1.0; and 2.0 M, whereas Na2HPO4·12H2O is 0.03; 0.17; 0.33; and 0.67 M, respectively. The co-precipitations were carried out under aqueous solution. As-synthesized photocatalysts were examined to degrade Rhodamine B (RhB) under blue light irradiation. The results showed that varying concentrations of starting materials affect the photocatalytic activities, the intensity ratio of [110]/[200] facet plane, and their bandgap energies of Ag3PO4 photocatalyst. The highest photocatalytic activity of the sample was obtained by synthesized using the 1.0 M of AgNO3 and 0.33 M of Na2HPO4·12H2O (AP-1.0). This is due to the high [110] facet plane and increased absorption along the visible region of AP-1.0 photocatalyst. Therefore, this result could be a consideration for the improvement of Ag3PO4 photocatalyst.

scholarly journals The Role of H2C2O4 and Na2CO3 as Precipitating Agents on The Physichochemical Properties and Photocatalytic Activity of Bismuth Oxide

2020 ◽  
Vol 18 (1) ◽  
pp. 129-137
Author(s):  
Yayuk Astuti ◽  
Rizka Andianingrum ◽  
Abdul Haris ◽  
Adi Darmawan ◽  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Physicochemical Properties ◽  
Bismuth Oxide ◽  
Rate Constants ◽  
Degradation Rate ◽  
Precipitation Method ◽  
Methyl Orange Degradation ◽  
Methyl Orange Dye

AbstractSynthesis of bismuth oxide synthesis through the precipitation method using H2C2O4 and Na2CO3 precipitating agents, identification of physicochemical properties and its photocatalysis activity for methyl orange degradation were conducted. The bismuth oxide synthesis was undertaken by dissolving Bi(NO3)3.5H2O in HNO3, then added precipitating agents to form precipitate. The results showed that bismuth oxide produced by H2C2O4 precipitating agent was a yellow powder containing a mixture of α-Bi2O3 (monoclinic) and β-Bi2O3 (tetragonal), porous with size of 28-85 μm. Meanwhile, the use of Na2CO3 as precipitating agent resulted in bismuth oxide consisting of α-Bi2O3 and β-Bi2O3 and Bi2O4, irregular shape without pore being 40-115 μm in size. Bismuth oxide synthesized with H2C2O4 precipitating agent showed higher photocatalytic activity compared to bismuth oxide synthesized using Na2CO3 on degrading methyl orange dye with degradation rate constants of 2.35x10-5 s-1 for H2C2O4 and 1.81x10-5 s-1 for Na2CO3.

Structure, morphology features and photocatalytic properties of α-Ag2WO4 nanocrystals-modified Palygorskite clay

2021 ◽  
Vol 02 ◽  
Author(s):  
Amanda Carolina Soares Jucá ◽  
Francisco Henrique Pereira Lopes ◽  
Herbert Vieira Silva-Júnior ◽  
Lara Kelly Ribeiro Silva ◽  
Elson Longo ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Dye Degradation ◽  
Degradation Kinetics ◽  
Low Cost ◽  
Catalytic Efficiency ◽  
Photocatalytic Properties ◽  
Impregnation Method ◽  
Heat Treated ◽  
Modified Palygorskite

Aims: In the present study, we investigate the photocatalytic properties of α-Ag2WO4 nanocrystals-modified Palygorskite (PAL) clay synthesized by the impregnation method. The PAL clay was chemically purified and heat-treated (500 ºC for 2 h), which served as an excellent supporting matrix for loading α-Ag2WO4(α-AWO) nanocrystals. Background: Water contamination is one of the most serious problems affecting human health, ecosystem survival, and the economic growth of societies. Industrial effluents, such as textile dyes, when not treated and improperly discharged into water resources are considered the main cause of water pollution. Thus the scientific community has been developing effective remediation technologies based on advanced oxidative processes to reduce the harmful effects of these organic pollutants. Objective: Improve the photocatalytic activity of PAL clay with α-AWO nanocrystals to degradation of Rhodamine B (RhB) dye. Methods: We purify and heat-treated the PAL clay, synthesize nanocrystals ofα-AWO nanocrystals and modify PAL clay with 30% α-AWO nanocrystals by the impregnation method. The modified PAL clay was able to improve RhB dye degradation. The materials were characterized by XRD, RAMAN,FE-SEM, FT-IR, XRF, etc. The samples were used as photocatalysts under UV-C lamps for the degradation of RhB dye in order to analyze its catalytic performances. Results: ThePAL clay modified with 30% α-AWO nanocrystals showed a catalytic efficiency of 79%, and degradation kinetics about 16 times higher when compared to PAL-500 only purified and heat-treated at 500 ºC. In this way, this PAL-modified is an alternative as a low-cost photocatalyst for the degradation of RhB dye. Conclusion: Ultraviolet-Visiblespectra revealed that our materials have opticalband gap energies controlled by indirect and direct electronic transitions and suitable to be activated under ultraviolet illumination. The adequate amount (30 wt.%) of α-Ag2WO4 nanocrystals added to PAL brought significant improvement of photocatalytic activity for the degradation of rhodamine B. Finally, a photocatalytic mechanism was proposed in detail.

Effect of the ratio ZnO: ZrO2 on the photocatalytic ability of phenol degradation in ZnO-ZrO2 nanocompsite materials

2021 ◽  
Vol 10 (3) ◽  
pp. xx-xx
Author(s):  
Thao Pham Thi Minh ◽  
Huong Do Thi ◽  
Hai Le Thi
Keyword(s):  
Photocatalytic Activity ◽  
Crystallite Size ◽  
Phenol Degradation ◽  
Average Crystallite Size ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Ultrasonic Vibrations ◽  
Phenol Content ◽  
Photocatalytic Ability ◽  
Photocatalytic Reactions

The ZnO-ZrO2 nanocompsite materials in the molar ratio (1:0; 1:1; 1:2; 2:1; 3:4; 4:3; 0:1) were prepared by a two-stage precipitation method with ultrasonic vibrations. The obtained ZnO-ZrO2 materials were characterized by XRD, SEM, UV-vis. XRD data identified phase of the ZnO and phase of ZrO2 in all obtained samples. The average crystallite size of the samples was between 18 to 30 nm. As UV-Vis spectra, the band gap of ZnO-ZrO2 composite (ZZ34R) is 3,06eV. The photocatalytic reactions confirmed that the nanocomposite sample showed higher photocatalytic activity than the pure oxides samples for the degradation phenol under 100W incandescent lamp. Among the prepared samples, the best sample for photocatalytic degration of phenol is the ZZ34R which the molar ratio ZnO:ZrO2 = 3:4 with 23% remaining phenol content after 300 minutes. The photodegradation phenol of sample with ultrasonic vibrations is higher than the sample without ultrasonic vibrations. This indicates that the materials are capable of treating phenol in wastewater.

scholarly journals Photocatalytic Performance of SiO2/CNOs/TiO2 to Accelerate the Degradation of Rhodamine B under Visible Light

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1671 ◽  
Author(s):  
Weike Zhang ◽  
Yanrong Zhang ◽  
Kai Yang ◽  
Yanqing Yang ◽  
Jia Jia ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electronic Microscope

A silicon dioxide/carbon nano onions/titanium dioxide (SiO2/CNOs/TiO2) composite was synthesized by a simple sol-gel method and characterized by the methods of X-ray diffraction (XRD), scanning electronic microscope (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), Fourier transform infrared (FTIR), thermogravimetric analysis (TG), differential scanning calorimeter (DSC) and UV-Vis diffuse reflectance spectra (UV-Vis DRS). In this work, the photocatalytic activity of the SiO2/CNOs/TiO2 photocatalyst was assessed by testing the degradation rate of Rhodamine B (RhB) under visible light. The results indicated that the samples exhibited the best photocatalytic activity when the composite consisted of 3% CNOs and the optimum dosage of SiO2/CNOs/TiO2(3%) was 1.5 g/L as evidenced by the highest RhB degradation rate (96%). The SiO2/CNOs/TiO2 composite greatly improved the quantum efficiency of TiO2. This work provides a new option for the modification of subsequent nanocomposite oxide nanoparticles.

Heterojunction Cu2O/RGO/BiVO4 ternary nanocomposites with enhanced photocatalytic activities towards degradation of rhodamine B and tetracycline hydrochloride

2019 ◽  
Vol 43 (46) ◽  
pp. 18240-18250 ◽  
Author(s):  
Xiaoying Hu ◽  
Qi Zhang ◽  
Haoshan Nan ◽  
Ming Wang ◽  
Liang Qiao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Tetracycline Hydrochloride ◽  
Photocatalytic Activities

The synergy of BVO, Cu2O and RGO inhibits the recombination of photogenic carriers to enhance the photocatalytic activity.

Research on the Solvothermal Synthesis and Photocatalytic Properties of Nano-Size ZnO

2013 ◽  
Vol 295-298 ◽  
pp. 503-506
Author(s):  
Da Jiang ◽  
Hong Liang Zhang ◽  
Ji Jie Wang
Keyword(s):  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Solvothermal Synthesis ◽  
Degradation Rate ◽  
Crystallization Mechanism ◽  
Photocatalytic Properties ◽  
Dimensional Structure ◽  
One Dimensional ◽  
Nano Size

Nano-size ZnO of one dimensional structure was prepared by solvothermal synthesis through dissolution-crystallization mechanism and characterized by TEM and XRD. Moreover, photocatalytic degradation rate of dye Rhodamine B (RhB) at the present of nano-size ZnO were carried out, and the results indicated that the nano-size ZnO prepared by such a method has excellent photocatalytic properties.

The Influence of Yb3+/Er3+ Co-Doped β-NaYF4 Up-Conversion Micron Tubes on Photocatalytic Activity of TiO2 for Degradation of Organic Dyes

2015 ◽  
Vol 1118 ◽  
pp. 211-216
Author(s):  
Yuan Liang Ma ◽  
Xue Rong Zheng ◽  
Wei Liu ◽  
Hai Qin Li ◽  
Hui Ming Ji
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Organic Dyes ◽  
Photocatalytic Efficiency ◽  
Simulated Sunlight ◽  
Combination Methods ◽  
Photocatalytic Activities ◽  
Pure Phase ◽  
Co Doped

Pure phase of Yb3+/Er3+ co-doped β-NaYF4 micron tubes with up-conversion fluorescence were synthesized by hydrothermal method at 180°C for 24 hours. For better utilization of sunlight and improving photocatalytic efficiency of organic dyes, TiO2 nanoparticles were modified by combining with β-NaYF4 micron tubes to form TiO2/NaYF4 composite. Three different combination methods were studied and the photocatalytic activities of the corresponding samples were tested by measuring the degradation rate of rhodamine aqueous solution under illumination of simulated sunlight. The composite that TiO2 nanoparticles were well dispersed on the surface of NaYF4 shows better photocatalytic activity than other composites and was near twice efficiency of pure TiO2 nanoparticles. The reason may be due to the high activity of heterostructure for TiO2/NaYF4 composite that will make it easy for sunlight absorption and photocatalytic degradation.

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