scholarly journals Preparation and Photocatalysis of CuO/Bentonite Based on Adsorption and Photocatalytic Activity

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5803
Author(s):  
Cuina Yang ◽  
Hongfa Xu ◽  
Jicun Shi ◽  
Zhifeng Liu ◽  
Lei Zhao
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Irradiation Time ◽  
Degradation Process ◽  
Optimum Conditions ◽  
Composite Photocatalyst ◽  
Decolorization Efficiency ◽  
Blue Solution ◽  
Visible Irradiation ◽  
Excellent Optical Property

A CuO/bentonite composite photocatalyst was prepared to fully utilize the adsorption capacity of bentonite and the photocatalytic activity of CuO. CuO and bentonite were chosen as a photocatalyst due to the excellent optical property of CuO and large specific surface area of bentonite, together with their high stability and low production cost. The sample was characterized by XRD, SEM, and BET. The effects of several factors on degradation process were investigated such as dosage of H2O2, irradiation time, pH of the solution, and dosage of catalyst. The optimum conditions for decolorization of methylene blue solution by CuO/bentonite were determined. Under optimal conditions, the decolorization efficiency of methylene blue by a 1.4% CuO/bentonite (400 °C) composite photocatalyst under visible irradiation at 240 min reached 96.98%. The degradation process follow edpseudo-second-order kinetics. The photocatalytic mechanism is discussed in detail. This composite structure provides a new solution to the cycle and aggregation of the photocatalyst in water.

scholarly journals Synthesis and Photoactivity of Fe3O4/TiO2-Co as a Magnetically Separable Visible Light Responsive Photocatalyst

2018 ◽  
Vol 18 (3) ◽  
pp. 403 ◽  
Author(s):  
Eko Sri Kunarti ◽  
Indriana Kartini ◽  
Akhmad Syoufian ◽  
Karolina Martha Widyandari
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Dopant Concentration ◽  
Band Gap Energy ◽  
Methylene Blue Solution ◽  
Magnetic Photocatalyst ◽  
Blue Solution ◽  
Degradation Reaction ◽  
Visible Irradiation ◽  
Uv Visible

Synthesis of magnetic photocatalyst, Fe3O4/TiO2-Co, with characterization and photoactivity examination have been conducted. The synthesis was initiated by preparation of Fe3O4 particles using coprecipitation method. The Fe3O4 particles were then coated with TiO2-Co at a various ratio of Fe3O4:TiO2 and concentration of Co(II) dopant. The Fe3O4/TiO2-Co was characterized by FTIR, XRD, TEM, SEM-EDX, VSM, and SR UV-visible methods. Photoactivity of the Fe3O4/TiO2-Co was carried out using methylene blue as a target molecule in degradation reaction within a batch system. By using optimum conditions, the degradation of methylene blue solution was performed under exposure to UV, visible light and dark condition. Results showed that the Fe3O4/TiO2-Co formation was confirmed by the presence of Fe3O4 and anatase diffraction peaks in the X-ray diffractogram. SR UV-Vis spectra indicated that the Fe3O4/TiO2-Co was responsive to visible light. Band gap energy of the Fe3O4/TiO2-Co with dopant concentration of 1; 5; 10 and 15% were 3.22; 3.12; 3.09 and 2.81 eV, respectively. The methylene blue solution can be well photodegraded at a pH of 10 for 210 min. The Fe3O4/TiO2-Co has the highest ability to methylene blue photodegradation with dopant concentration of 10% gave degradation yield of 80.51 and 95.38% under UV and visible irradiation, respectively.

Modeling and Optimization of Photocatalytic Degradation of Methylene Blue Using Lanthanum Vanadate

2020 ◽  
Vol 1008 ◽  
pp. 97-103
Author(s):  
Mahmoud Samy ◽  
Mona G. Ibrahim ◽  
Mohamed Gar Alalm ◽  
Manabu Fujii
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Textile Industry ◽  
Degradation Process ◽  
Optimum Conditions ◽  
Photo Degradation ◽  
Operational Conditions ◽  
Degradation Rates ◽  
Effects Of Ph

Methylene blue (MB) is one of the commonly used dyes in the textile industry and can be used as a model pollutant for the textile industry wastewater. In this work, the photocatalytic degradation of MB by synthesized nanoparticles of lanthanum vanadate (LaVO4) was assessed. The effects of pH, initial MB concentration and catalyst dose on the removal performance of MB were investigated and measuring the optimum values of these operational conditions was performed using response surface methodology (RSM). Catalyst dose of 0.43 g/L, initial MB concentration of 5.0 mg/L, and pH of 6.86 were found to be the optimum conditions in reaction time of 60 min. A mathematical model was formed to relate the removal efficiency of MB to the aforementioned operating parameters. The removal efficiency of MB was 91% without any scavengers at a catalyst dose of 0.3 g/L, pH of 7 and initial MB concentration of 10 mg/L. The trapping experiments confirmed the participation of different reactive species in the photo-degradation process. The degradation rates of MB were 91%, 86%, 81%, 77.70% and 72% in five successive runs using LaVO4.

Photocatalytic Activity of TiO2-HZSM-5 Composite for C.I. Reactive Red 2 Degradation

2011 ◽  
Vol 213 ◽  
pp. 20-24
Author(s):  
Li Fang Zhang ◽  
Peng Wang ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Degradation Rate ◽  
Irradiation Time ◽  
Weight Ratio ◽  
Composite Photocatalyst ◽  
Temperature Range ◽  
Reactive Red 2

A composite of TiO2 and HZSM-5 zeolite was used for photocatalytic degradation of C.I. Reactive Red 2(RR2). With TiO2 concentration of 320 mg/l, the optimum composite was composed of TiO2 and HZSM-5 by the weight ratio of 1:10. The composite showed higher activity than the P25 powder in calcination temperature range from 400 to 600 oC and 450 oC can be the optimum calcination temperature. When irradiation time was 40 min, the composite degraded 96.8% of the initial RR2. 94.9% of the dye was degraded in 70 min using pure TiO2. The RR2 degradation rate increased constantly with increasing composite photocatalyst concentration up to 320 mg/l. The activity of the composite grinded without ethanol was less than that of the composite photocatalyst grinded with ethanol.

scholarly journals Effect of Oxalic Acid Leaching on Photocatalytic Activity of Natural Sphalerite

2020 ◽  
Author(s):  
Chukwunonso Onyenanu ◽  
Lovet Emembolu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Irradiation Time ◽  
Acid Leaching ◽  
Blue Dye ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Visible Light Illumination

Abstract Photocatalytic activity of the natural semiconducting sphalerite mineral from Abuni, Nasarawa State, Nigeria was studied for the degradation of methylene blue (MB). Natural Sphalerite as a visible – light responsive photocatalyst was characterized by X ray diffraction (XRD), X ray fluorescence (XRF) and surface area analysis. To further enhance the photocatalytic activity of natural Sphalerite, the chemical composition of the sphalerite was varied via leaching with oxalic acids. The photocatalytic activity of the Natural sphalerite, leached sphalerite and as well as the calcined leachates was tested for MB degradation under visible light illumination. The result shows a very high percentage of MB degradation by natural sphalerite after 60mintues of light irradiation time. A composite of ZnO -α –Fe2O3 -ϒ-Fe2O3 with traces amount of MoO and MnO2 was synthesized by calcination of the obtained leachates at 1000°C for 4hours. The photocatalytic degradation of methylene blue dye follows pseudo first order kinetics.

scholarly journals Photocatalytic Activity of ZnO-Biochar Hybrid Composites

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
J. Matos ◽  
R. Montaña ◽  
E. Rivero ◽  
J. Velasco ◽  
G. Ledezma
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hybrid Composites ◽  
Scaling Up ◽  
Surface Groups ◽  
Synergy Effect ◽  
First Order ◽  
Visible Irradiation ◽  
Uv Visible ◽  
The Difference

<span>Photodegradation of methylene blue (MB) was studied on ZnO in presence of home-made biochars </span><span>prepared by different methods. MB photodegradation was performed under UV-visible irradiation to verify </span><span>the scaling-up of ZnO-AC hybrid materials. It was verified that oxygenated surface groups on carbon were </span><span>photochemically active in the photodegradation of MB and a synergy effect between both solids has been </span><span>estimated from the first-order apparent rate-constants. This effect enhances the photoactivity of ZnO up to </span><span>a factor about 2.5 and the difference in photoactivity in the binary materials was associated to the surface </span><span>properties of AC.</span>

scholarly journals Preparation of Multicycle GO/TiO2 Composite Photocatalyst and Study on Degradation of Methylene Blue Synthetic Wastewater

2019 ◽  
Vol 9 (16) ◽  
pp. 3282 ◽  
Author(s):  
Zhongtian Fu ◽  
Song Zhang ◽  
Zhongxue Fu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Raw Materials ◽  
Anatase Phase ◽  
Pure Tio2 ◽  
Synthetic Wastewater ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Composite Photocatalyst ◽  
Initial Ph

A series of composite photocatalysts were prepared by using graphene oxide (GO) prepared by modified Hummers method and TiO2 hydrogel prepared by using butyl titanate as raw materials. The composite photocatalyst was characterized through scanning electron microscope（SEM）, x ray diffraction （XRD）, and Raman spectroscopy, and the degradation effect of pure TiO2 and composite photocatalyst on methylene blue (MB) dye wastewater under different experimental conditions was studied. The results showed that TiO2 in composite photocatalyst was mainly anatase phase and its photocatalytic activity was better than pure TiO2. When the addition of GO reached 15 wt%, the photocatalytic activity was the highest. When 200 mg composite photocatalyst was added to 200 mL synthetic wastewater with a concentration of 10 mg/L and an initial pH of about 8, the degradation rate could reach 95.8% after 2.5 h. It is presumed that the photogenerated charges of GO/TiO2 composite photocatalyst may directly destroy the luminescent groups in the MB molecule and thus decolorize the wastewater, and no other new luminescent groups are generated during the treatment.

Preparation and Visible-Light Photocatalytic Activity of TiO2 Nanotubes from a Hydrothermal Method

2011 ◽  
Vol 197-198 ◽  
pp. 786-789 ◽  
Author(s):  
Rui Liu ◽  
Wein Duo Yang ◽  
Hui Ju Chueng
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Raw Material ◽  
Methylene Blue Solution ◽  
Hydrothermal Temperature ◽  
Blue Solution ◽  
Visible Light Photocatalytic

TiO2 nanotubes were synthesized using TiO2 powder as raw material from a hydrothermal method. It was observed that the sample prepared at 130°C and calcined at 450°C only anatase formed, but the sample calcined at 800°C, both anatase and rutile formed. The obtained TiO2 nanotubes prepared at a hydrothermal temperature of 130°C and calcined at 450°C have a greater surface area of 356.8m2/g. Moreover, the TiO2 nanotubes demonstrate the photocatalytic degradation of methylene blue solution effectively by exposing the nanotubes in aqueous solution under visible light.

Photocatalytic Activity of Mixed Phase TiO2 from Microwave-Assisted Synthesis

2013 ◽  
Vol 664 ◽  
pp. 661-666 ◽  
Author(s):  
Nuchanaporn Pijarn ◽  
Sirithan Jeimsirilers ◽  
Supatra Jinawath
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Organic Compounds ◽  
Irradiation Time ◽  
Synthesis Method ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Bacteria And Fungi ◽  
Hydrolysis Of

Photocatalyst is an environmental clean-up material when exposed to light. It can decompose organic compounds, bacteria and fungi as well as foul odors. Titanium dioxide (TiO2) has long been well known for its powerful photocatalytic activity. However, its properties depend on several factors and synthesis method is one of them. In this work, TiO2powders were prepared by three methods, namely microwave-assisted hydrolysis of titanium oxysulfate (TiOSO4), hydrolysis of TiOSO4, and also by calcining of TiOSO4. Photocatalytic activity of the obtained TiO2powders were evaluated through the decomposition of methylene blue in comparison with P25 (Degussa). Results showed that the TiO2prepared at conditions of microwave 100 watts, irradiation time of 10 min was most effective when compared with the others in this work.

ZnS:Mn2+ Quantum Dots as Efficient Photocatalyst for Organic Dye Decolorization

2018 ◽  
Vol 386 ◽  
pp. 207-213
Author(s):  
Ksenia A. Sergeeva ◽  
Alexander A. Sergeev ◽  
Yulia V. Kuznetsova ◽  
Sergey S. Voznesenskiy
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Room Temperature ◽  
Dye Decolorization ◽  
Organic Dye ◽  
Intrinsic Defect ◽  
Zinc Blende ◽  
Decolorization Efficiency ◽  
Uv Excitation

Fluorescent zinc blende structured pure and Mn2+ doped ZnS quantum dots were prepared by simple aqueous based technique at room temperature. Under UV-excitation the quantum dots show photoluminescence bands at 2.1 and 3.0 eV corresponded to Mn2+ and ZnS intrinsic defect emission, respectively. The photocatalytic activity was tested for the photodegradation of methylene blue in aqueous solution. The influence of the Mn2+ concentration on the dye decolorization efficiency was studied. The highest photocatalytic degradation rate of methylene blue was obtained for ZnS quantum dots in glutathione shell doped with 0.5 at.% of Mn2+. The mechanisms of photoluminescence and photocatalytic activity were discussed.

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