Porous CuO nanostructure as a reusable catalyst for oxidative degradation of organic water pollutants

2016 ◽  
Vol 40 (1) ◽  
pp. 348-357 ◽  
Author(s):  
Pangkita Deka ◽  
Ramesh C. Deka ◽  
Pankaj Bharali
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Methyl Orange ◽  
Oxidative Degradation ◽  
Reusable Catalyst ◽  
High Catalytic Activity ◽  
Water Pollutants ◽  
Cuo Nanostructure

Porous CuO nanostructure exhibits high catalytic activity for the degradation of methylene blue and methyl orange in the presence of H2O2.

Three-Dimensional Periodic Hematite Photocatalysts Fabricating by Direct Writing Method

2014 ◽  
Vol 1025-1026 ◽  
pp. 621-627
Author(s):  
Qin Mei Peng ◽  
Bo Li ◽  
Jin Wang ◽  
Ji Jiao Li ◽  
Ji Zhou
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Organic Contaminants ◽  
Degradation Rate ◽  
Sol Gel ◽  
Three Dimensional ◽  
High Catalytic Activity ◽  
Direct Writing ◽  
Catalytically Active ◽  
Gel Technique

Three-dimensional (3-D) periodic hematite scaffold was successfully fabricated by direct writing method as a catalyst for degradation of organic contaminants. Photo-catalytically active α-Fe2O3 nanoparticles have been synthesized by sol-gel technique. Aqueous slurries of iron oxides were freeform fabricated to produce hematite scaffolds with a 3-D periodic architecture and multiscale porosity. The catalytic activity of the hematite scaffolds was evaluated in the degradation of Methylene Blue (MB). It was found that the degradation rate of MB dye was over 83%. The result strongly indicates that the hematite scaffolds exhibits a high catalytic activity. Moreover, this work provides an important step forward in the creation of suitable structures for photocatalyst.

Boron Doped ZnO Nanostructures for Photo Degradation of Methylene Blue, Methyl Orange and Rhodamine B

2021 ◽  
Vol 21 (4) ◽  
pp. 2483-2494
Author(s):  
Aqeel Ahmed Shah ◽  
Ali Dad Chandio ◽  
Asif Ahmed Sheikh
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Methyl Orange ◽  
Rhodamine B ◽  
Recombination Rate ◽  
Charge Recombination ◽  
Photo Degradation ◽  
Photo Catalytic Activity ◽  
Doped Zno ◽  
Nonmetal Doping

The design of sensitive and efficient photo catalyst for the energy and environmental applications with minimum charge recombination rate and excellent photo conversion efficiency is a challenging task. Herein we have developed a nonmetal doping methodology into ZnO crystal using simple solvothermal approach. The boron (B) is induced into ZnO. The doping of B did not make any significant change on the morphology of ZnO nano rods as confirmed by scanning electron microscopy (SEM) without considerable change on periodic arrangement of nanostructures. The existence of B, Zn, and O is shown by energy dispersive spectroscopy (EDS). The X-ray diffraction (XRD) patterns are well matched to the hexagonal phase for both pristine ZnO and B-doped ZnO. The XRD has shown slight dislocation of 2theta degree. The UV-visible spectroscopy was used to measure the optical bandgap and photo catalytic activity for the degradation of organic dyes. The nonmetal doped ZnO has shown potential and outstanding photo catalytic activity for the photo degradation of methylene blue (MB), methyl orange (MO) and rhodamine B in aqueous solution. The photo degradation efficiency of MB, MO and rhodamine B is found to be 96%, 86% and 80% respectively. The enhanced photo catalytic activity of B-doped ZnO is indexed to the inhibited charge recombination rate due to the reduction in the optical bandgap. Based on the obtained results, it can be said that nonmetal doping is excellent provision for the design of active materials for the extended range of applications.

Catalytic activity of MnOx/WO3 nanoparticles: synthesis, structure characterization and oxidative degradation of methylene blue

2014 ◽  
Vol 38 (3) ◽  
pp. 1250-1255 ◽  
Author(s):  
Mojtaba Amini ◽  
Behzad Pourbadiei ◽  
T. Purnima A. Ruberu ◽  
L. Keith Woo
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Oxidative Degradation ◽  
Structure Characterization ◽  
Effective Catalyst ◽  
Nanoparticles Synthesis

MnOx/WO3 nanoparticles were found to be an effective catalyst for the degradation of methylene blue, an important industrial dye and a problematic pollutant.

Green Synthesis of Silver Nanoparticles by Tannic Acid with Improved Catalytic Performance Towards the Reduction of Methylene Blue

NANO ◽  
2018 ◽  
Vol 13 (01) ◽  
pp. 1850003 ◽  
Author(s):  
Yueyue Hao ◽  
Nan Zhang ◽  
Jing Luo ◽  
Xiaoya Liu
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Tannic Acid ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Ag Nps ◽  
Environmental Friendly ◽  
Vis Spectroscopy

In this work, a facile, environmental-friendly and cost-effective method was developed to prepare silver nanoparticles (Ag NPs) in aqueous solution at room temperature. In our approach, tannic acid was employed as the reducing agent and stabilizer simultaneously, avoiding the usage of any toxic agent. The tannic acid derived silver nanoparticles (TA-Ag NPs) were fully characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetric analyzer (TGA). The particle size of the synthesized TA-Ag NPs is tunable from 6.5[Formula: see text]nm to 19.2[Formula: see text]nm with narrow distribution by varying the molar ratio of TA to silver precursor. Efficient reduction of methylene blue (MB) catalyzed by TA-Ag NPs was observed, which was dependent upon the particle size of TA-Ag NPs or the TA concentration used for synthesis. By optimizing the TA concentration, complete reduction of MB was accomplished by TA-Ag NPs within 8[Formula: see text]min. The high catalytic activity of TA-Ag NPs was attributed to their nanosize and good dispersity as well as the electrostatic interaction between TA and MB which induces rapid enrichment of MB towards TA-Ag NPs, creating a locally concentrated layer of MB. Considering the facile and environmental-friendly preparation procedure and excellent catalytic activity, TA-Ag NPs are green, efficient and highly economical candidates for the catalysis of organic dyes and extendable of other reducible contaminants as well.

Photocatalytic degradation of methylene blue on magnetically separable FePc/Fe3O4 nanocomposite under visible irradiation

2009 ◽  
Vol 81 (12) ◽  
pp. 2327-2335 ◽  
Author(s):  
Kun Wang ◽  
Lixia Yu ◽  
Sheng Yin ◽  
Henan Li ◽  
Huaming Li
Keyword(s):  
Magnetic Field ◽  
Methylene Blue ◽  
Oxidative Degradation ◽  
High Catalytic Activity ◽  
Iron Phthalocyanine ◽  
X Ray ◽  
Transmission Electron ◽  
Visible Irradiation ◽  
Magnetically Separable ◽  
Catalytic Cycles

A novel magnetically separable photocatalyst iron phthalocyanine/Fe3O4 (FePc/Fe3O4) nanocomposite was easily prepared by an organic–inorganic complexation technique, and characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and Fourier transform-infrared (FTIR). This functional nanocomposite has been found to exhibit high catalytic activity in the presence of added hydrogen peroxide, for oxidative degradation of methylene blue (MB) under visible light irradiation. Under these conditions, MB (10 mg/l) underwent about 78 % oxidation in 2 h, and the catalyst still retained high activity after five catalytic cycles. Intervening recovery was easily achieved by changing the external magnetic field.

scholarly journals H4SiW12O40Catalyzed One-Pot Synthesis of 12-Aryl-8,9,10,12-tetrahydrobenzo[a] Xanthen-11-ones Under Solvent-Free Conditions

2012 ◽  
Vol 9 (2) ◽  
pp. 786-790 ◽  
Author(s):  
A. Hassankhani ◽  
E. Mosaddegh ◽  
S. Y. Ebrahimipour
Keyword(s):  
Catalytic Activity ◽  
Solvent Free ◽  
Environmentally Benign ◽  
Reusable Catalyst ◽  
High Catalytic Activity ◽  
One Pot ◽  
Aryl Aldehydes ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
The One

An efficient and environmentally benign protocol for the one-pot, three-component synthesis of 12-aryl-8,9,10,12-tetrahydro-benzo[a]xanthen-11-one derivatives by condensation of aryl aldehydes, 2-naphthol and dimedone using H4SiW12O40(SiWA) as a reusable catalyst with high catalytic activity was reported. The reaction was carried out at 100 ºC under solvent-free conditions within 15-40 min in 82-91% yield.

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