scholarly journals Fabrication of Hierarchical Nanocomposites through a Nature-Mimic Method: Depositing MoS2 Nanoparticles on Carbon Nitride Nanotubes by Polydopamine Coating

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yansong Wu ◽  
Wei Ding ◽  
Jian Li
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Carbon Nitride ◽  
Adhesive Layer ◽  
Interfacial Interaction ◽  
High Catalytic Activity ◽  
Nanocomposite Structure ◽  
Universal Approach ◽  
Ft Ir ◽  
Mos2 Nanoparticles

The combination of 1D nanotubes with 0D nanoparticles to integrate a nanocomposite structure has attracted increasing research interest, while the interfacial interaction plays an important role in such composites. This paper presents a facile and universal approach for the fabrication of hierarchical NP-NT nanocomposites with improved photocatalytic performances by mussel chemistry. Polydopamine (PDA) serves as the biomimetic adhesive layer and then connects MoS2 nanoparticles with g-C3N4 nanotubes (CNNTs). The obtained nanocomposites were characterized by FT-IR spectra, XRD, SEM, TEM, XPS, UV-vis DRS, and PL. Compared with unmodified CNNTs, the as-prepared MoS2-PDA-CNNT composites exhibited an enhanced photocatalytic properties for the degradation of methylene blue (MB) under visible light irradiation. This research would provide a green and versatile method to construct hierarchical structured nanocomposites with high catalytic activity.

Preparation of Cobalt Phthalocyanine Supported Mg-Al Hydrotalcite and its Catalytic Activity for Degradation of Methylene Blue

2017 ◽  
Vol 748 ◽  
pp. 433-437
Author(s):  
Meng Xia Qian ◽  
Jian Li Ma ◽  
Min Hong Xu
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Supported Catalyst ◽  
Water Soluble ◽  
Precipitation Method ◽  
High Catalytic Activity ◽  
Catalytic Application ◽  
Ft Ir ◽  
Supporting Material ◽  
Co Precipitation

A novel supported catalyst is prepared through immobilization of water soluble phthalocyanine, which is synthesized by modifying tetraminophthalocyanine with cyanuric chloride, onto the supporting material Mg-Al hydrotalcite via co-precipitation method. The structure of the catalyst is characterized by infrared spectroscopy instrument (FT-IR) and X-ray diffractometer. Catalytic activity is examined through comparative experiments. The results show that it exhibits high catalytic activity for degradation of methylene blue (MB) in the presence of H2O2, the remaining rate of MB is 12.02% after 6 h. The reaction process conforms to the equation of pseudo-first-order kinetics, and the correlation coefficient R2> 0.99. The recycling tests for five times are also carried out and prove its reusability in catalytic application.

scholarly journals A study on the synthesis of MIL-100(Fe) and its application in the catalytic degradation of methylene blue

2018 ◽  
Vol 1 (T5) ◽  
pp. 149-157
Author(s):  
Thien Vinh Tran ◽  
Dien Huu Huynh
Keyword(s):  
Methylene Blue ◽  
Fourier Transform ◽  
Catalytic Activity ◽  
Oxidation Reaction ◽  
Hydrothermal Process ◽  
Catalytic Degradation ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

In the present paper, a study on the synthesis of MIL-100(Fe) by hydrothermal process and its application in the catalytic degradation of methylene blue (MB) was demonstrated. The obtained samples were characterized by X-ray Diffraction (XRD), scaning electron microscope (SEM), Fourier-transform infrared spectroscopy (FT-IR), Brunauer, Emmett and Teller (BET) and energy-dispersive X-ray spectroscopy (EDX). The results showed that the synthesized MIL- 100(Fe) exhibited high crystallinity and surface area. Its catalytic activity was evaluated by measuring the rate of conversion of MB after oxidation reaction by H2O2. The results indicated that the MIL-100(Fe) showsed high catalytic activity for the oxidation reaction of MB and at pH = 10, MB was degraded almost completely after after 3 hours of presence of the catalyst.

scholarly journals N-Hydroxyphthalimide Supported on Silica Coated with Ionic Liquids Containing CoCl2 (SCILLs) as New Catalytic System for Solvent-Free Ethylbenzene Oxidation

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 252 ◽  
Author(s):  
Gabriela Dobras ◽  
Kornela Kasperczyk ◽  
Sebastian Jurczyk ◽  
Beata Orlińska
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Fold Increase ◽  
Solvent Free ◽  
High Catalytic Activity ◽  
Ethylbenzene Oxidation ◽  
Solvent Free Conditions ◽  
Ft Ir ◽  
Tga Analysis ◽  
Ft Ir Spectroscopy

N-Hydroxyphthalimide was immobilized via ester bond on commercially available silica gel (SiOCONHPI) and then coated with various ionic liquids containing dissolved CoCl2 (SiOCONHPI@CoCl2@IL). New catalysts were characterized by means of FT IR spectroscopy, elemental analysis, SEM and TGA analysis and used in ethylbenzene oxidation with oxygen under mild solvent-free conditions (80 °C, 0.1 MPa). High catalytic activity of SiOCONHPI was proved. In comparison to a non-catalytic reaction, a two-fold increase in conversion of ethylbenzene was observed (from 4.7% to 8.6%). Coating of SiOCONHPI with [bmim][OcOSO3], [bmim][Cl] and [bmim][CF3SO3] containing CoCl2 enabled to increase the catalytic activity in relation to systems in which IL and CoCl2 were added directly to reaction mixture. The highest conversion of ethylbenzene was obtained while SiOCONHPI@CoCl2@[bmim][OcOSO3] were used (12.1%). Catalysts recovery and reuse was also studied.

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.

Preparation of H5PMo10V2O40 /SBA-15 Catalyst and Application in Synthesis of Tributyl Citrate

2011 ◽  
Vol 236-238 ◽  
pp. 1019-1022
Author(s):  
Bing Hu ◽  
Chuan Qun Hu ◽  
Long Hui Nie ◽  
Ming Xia Fan
Keyword(s):  
Catalytic Activity ◽  
Structural Stability ◽  
Heteropoly Acid ◽  
Acid Catalyst ◽  
Catalytic Synthesis ◽  
High Catalytic Activity ◽  
Impregnation Method ◽  
Dispersion Characteristics ◽  
Fine Dispersion ◽  
Ft Ir

The heteropoly acid catalyst of H5PMo10V2O40 supported on SBA-15 mesoporous mole-cular sieve was prepared by an impregnation method and characterized by nitrogen physisorption, FT-IR,SEM, and used in catalytic synthesis of tributyl citrate. The results show that the heteropoly acid catalyst has fine dispersion characteristics, structural stability, high catalytic activity and better reusability.

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.

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.

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.

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