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 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.

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 of copper oxide nano-rice structures for enhancement of photocatalytic activity under natural sunlight

2019 ◽  
Vol 20 (5) ◽  
pp. 253-262
Author(s):  
Roonak Abdul Salam A.Alkareem
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Copper Oxide ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Methylene Blue Degradation ◽  
X Ray ◽  
Uv Visible ◽  
Scanning Electron

In this work, copper oxide (CuO) nano-rice structure was prepared by hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and UV-visible spectrophotometer. CuO nano-rice structure showed high photocatalytic activity towards degradation of methylene blue (MB). Hydrothermally growth of CuO provided uniformly distributed nano-rice structures with high degradation efficiency (90.41%) and rate constant (kt) 16.6 × 10-2 min-1 for methylene blue degradation.

The Influence of ZnO Components on the Photocatalytic Activity of Fe3O4-CuO-ZnO Nanocomposites

2015 ◽  
Vol 1123 ◽  
pp. 227-232 ◽  
Author(s):  
Iqriah Kalim Susanto ◽  
Ardiansyah Taufik ◽  
Rosari Saleh
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Sol Gel ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible

Nanocomposite Fe3O4-CuO-ZnO with different molar ratio of Fe3O4:CuO:ZnO were synthesized using sol-gel method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, field emission scanning electron microscope, UV-visible diffuse reflectance spectroscopy and vibrating sample magnetometer. The characterization results manifested that the combination of Fe3O4, CuO and ZnO nanoparticles was successful. The photocatalytic activity of nanocomposite with the molar ratio of 1:1:5 was more effective in the degradation of methylene blue under UV light irradiation than pure Fe3O4, CuO, ZnO. The role of photoactive species involved in the photocatalytic reaction was studied and found that holes play the most important role in photodegradation of methylene blue.

scholarly journals Low temperature synthesis of water dispersible F-doped TiO2 nanorods with enhanced photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21547-21555 ◽  
Author(s):  
Jiaxu Zhao ◽  
Wenting Li ◽  
Xue Li ◽  
Xiaokai Zhang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Low Temperature ◽  
Atmospheric Pressure ◽  
Tio2 Nanorods ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Doped Tio2 ◽  
Water Dispersible ◽  
Visible Irradiation

F-doped TiO2 nanorods are prepared at 100 °C and atmospheric pressure in the presence of NaF, which show superior photocatalytic activity for the degradation of methylene blue under UV and visible irradiation.

scholarly journals Pyrolysis Synthesized g-C3N4for Photocatalytic Degradation of Methylene Blue

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Gang Xin ◽  
Yali Meng
Keyword(s):  
Methylene Blue ◽  
Fourier Transform ◽  
Photocatalytic Activity ◽  
Carbon Nitride ◽  
Diffuse Reflectance ◽  
Photogenerated Electron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Uv Visible

Graphitic carbon nitride (g-C3N4) was synthesized at 520°C by the pyrolysis of cyanamide, dicyandiamide, and melamine. The samples were characterized by X–ray diffraction (XRD), UV-visible diffuse reflectance spectra, Fourier transform infrared spectroscopy (FT-IR), and elemental analyzer. The photocatalytic activity of g-C3N4was evaluated by the photodegrading experiments of methylene blue (MB). The results indicated that g-C3N4. A photocatalytic mechanism presumed the MB photodegradation over the C3N4photocatalyst is attributed to photogenerated electron impelled multistep reduction of O2.

Adsorption and UV/Visible photocatalytic performance of BiOI for methyl orange, Rhodamine B and methylene blue: Ag and Ti-loading effects

CrystEngComm ◽  
2014 ◽  
Vol 16 (15) ◽  
pp. 3155-3167 ◽  
Author(s):  
Yohan Park ◽  
Yulyi Na ◽  
Debabrata Pradhan ◽  
Bong-Ki Min ◽  
Youngku Sohn
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
P Adsorption ◽  
Loading Effects ◽  
Uv Visible ◽  
Visible Photocatalytic Activity

Adsorption and UV/visible photocatalytic activity of echinoid-like Ag and Ti-loaded BiOI were tested for methyl orange, Rhodamine B and methylene blue.

Hydrothermal synthesis, characterization and photocatalytic activity of Mg doped MoS2

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Muhammad Iftikhar Khan ◽  
Muhammad Touheed ◽  
Muhammad Sajjad-ul-Hasan ◽  
Muhammad Siddique ◽  
Syed Awais Rouf ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Band Gap ◽  
Research Work ◽  
Chemical Bonds ◽  
Visible Spectroscopy ◽  
Mg Doping ◽  
Uv Visible ◽  
Scanning Electron ◽  
Mg Doped

Abstract In this research work nanoparticles of Mg (0, 1, 2 and 3%) doped MoS2 are prepared by Hydrothermal method at 200 °C for 9 h. Scanning Electron Microscope (SEM) for surface morphology, Fourier Transform Infrared Spectroscopy (FTIR) for structural and chemical bonding and UV-visible spectroscopy for optical properties are used. SEM showed that sheet-like structure has changed into stone-like shaped when Mg has doped into MoS2. From FTIR, Mo–O, Mo=S, and H–O bond peaks are becoming dim and new chemical bonds S=O, Mo=O, Mg–O, CH and OH are forming with the increase of Mg doping. UV-visible spectroscopy showed that MoS2 has an indirect bandgap 2.21 eV. Band gap decreased from 1.84 to 1.82 eV when the Mg doping was increased from 1 to 2%, respectively. As Mg concentration was increased i.e. 3% then band gap increased to 1.88 eV. Photocatalytic activity (PCA) of undoped and Mg doped MoS2 is appraised by degrading rhodamine blue (RhB) and methylene blue (MB) dyes. The results showed that PCA (in presence of visible light) Mg doped MoS2 is greater than pure MoS2 which significantly increased the photocatalytic properties.

Photocatalytic Activity of W Doped Ta2O5 Particles for Methylene Blue Degradation under UV-Light

2011 ◽  
Vol 197-198 ◽  
pp. 281-284 ◽  
Author(s):  
Yan Hong Zhao ◽  
Li Chun Hou ◽  
Xiang Li ◽  
Xiaodong Yang ◽  
Xiao Jing Wang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Tantalum Oxide ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Methylene Blue Degradation ◽  
X Ray ◽  
First Order ◽  
Kinetics Of

Tungsten doped tantalum oxide (W-Ta2O5) particles were synthesized by a low temperature hydrothermal method. The phase structure of W-Ta2O5particles was characterized by X-ray diffraction (XRD). The XRD results indicated that the samples belonged to orthorhombic crystal. The photocatalytic activity of samples was investigated with degradation methylene blue (MB) under ultraviolet light. The degradation efficiency of MB under the catalysis of W-Ta2O5particles attained 91% when the reaction time was 7 h. The kinetics of MB degradation was respect to the first-order in the presence of the photocatalysts.

Copper Phthalocyanine/Fe3O4 Nanocomposite for Photocatalytic Degradation of Methylene Blue under Visible Irradiation

2011 ◽  
Vol 239-242 ◽  
pp. 2183-2186
Author(s):  
Kun Wang ◽  
Li Na Dai ◽  
He Nan Li ◽  
Chang Ju ◽  
Wei Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Copper Phthalocyanine ◽  
High Photocatalytic Activity ◽  
Nano Composites ◽  
Core Shell ◽  
Visible Irradiation ◽  
Magnetically Separable

Magnetically separable copper phthalocyanine/Fe3O4(CuPc/Fe3O4) core–shell nano- composites were prepared by an organic-inorganic complexation technique, which could effectively catalyze photodegradation of the model pollutant methylene blue (MB), using hydrogen peroxide as oxidant under visible light irradiation. Moreover, the as-prepared functional nanocomposites could be easily separated from the photodegradation system by using an external magnetic field, which still kept high photocatalytic activity after 5 time’s continual utilization.

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