scholarly journals Catalytic Oxidation of Methylene Blue by Attapulgite/TiO2

2021 ◽  
Vol 9 ◽  
Author(s):  
Jianping Shang ◽  
Yu Jiang ◽  
Xiaoping Qin ◽  
Bin Zhao ◽  
Xuefei Li
Keyword(s):  
Methylene Blue ◽  
Ethanol Solution ◽  
Tetrabutyl Titanate ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Transfer Factors ◽  
Printing And Dyeing Wastewater ◽  
Effects Of Temperature ◽  
Optimal Reaction

Methylene blue (MB) is a common pollutant in wastewater of printing and dyeing industry. At present, ozone oxidation is commonly used in the treatment of printing and dyeing wastewater. Ozone is used for oxidation reaction directly and indirectly. However, the reaction rate is not fast enough. In this study, the attapulgite (ATP) was modified by tetrabutyl titanate-ethanol solution. The TiO2/ATP nanocomposite with high catalytic activity was prepared. The synthesized samples were subjected to characterized by X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR). The morphology and particle size of the particles were observed by scanning electron microscopy (SEM). The TiO2/ATP nanocomposite was calcined at 300°C for 2 h, and the degradation rate of 80 mg/L methylene blue was 99.8%. The experimental results show that the ozone, temperature and mass transfer factors are excluded, and the effects of temperature, MB concentration and pH on the degradation of methylene blue are investigated. The optimal reaction conditions are as follows: The ozone concentration is 0.067 g/min; the ozone flow rate is 0.15 NL/min; the stirrer rotation speed is 550 r/min; the catalyst is 0.1 g; the temperature is 50°C; Based on the results, the reaction mechanism was derived and the kinetic study of the experiment was carried out.

scholarly journals Catalytic Oxidation of Methylene Blue by Attapulgite/TiO2

2021 ◽  
Author(s):  
Jianping Shang ◽  
Yu Jiang ◽  
Xiaoping Qin ◽  
Bin Zhao ◽  
Xuefei Li
Keyword(s):  
Methylene Blue ◽  
Ethanol Solution ◽  
Tetrabutyl Titanate ◽  
High Catalytic Activity ◽  
Direct Reaction ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Transfer Factors ◽  
Printing And Dyeing Wastewater ◽  
Experimental Scheme

Abstract Methylene blue(MB) is a common pollutant in wastewater of printing and dyeing. At present, ozone oxidation is commonly used in the treatment of printing and dyeing wastewater. Ozone is oxidized by direct reaction and indirect reaction, However, the reaction rate is not high and it is impossible to completely mineralize organic matter. The experimental scheme is to impregnate the attapulgite(ATP) with a volume of tetrabutyl titanate-ethanol solution. The TiO2/attapulgite nanocomposite with high catalytic activity was prepared. The synthesized samples were subjected to characterized by X-Ray diffraction(XRD). The morphology and particle size of the particles were observed by scanning electron microscopy (SEM). The attapulgite modified by TiO2 was calcined at 300°C for 2 h, and the degradation rate of 80 mg/L methylene blue was 99.8%. The experimental results show that the ozone, temperature and mass transfer factors are excluded, and the effects of temperature, MB concentration and pH on the degradation of methylene blue are investigated. The optimal reaction conditions are as follows: The ozone concentration is 0.067 g/min; the ozone flow rate is 0.15 NL/min; the stirrer rotation speed is 550 r/min; the catalyst is 0.1 g; the temperature is 50°C; Based on the results, the reaction mechanism was derived and the kinetic study of the experiment was carried out.

Isomerization of α-Pinene over Alumina-Pillared Montmorillonite

2013 ◽  
Vol 746 ◽  
pp. 49-52 ◽  
Author(s):  
Peng Quan Yao ◽  
Lin Hua Zhu ◽  
Jin Yang ◽  
Tian Si
Keyword(s):  
Basal Spacing ◽  
High Catalytic Activity ◽  
Temperature Reaction ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Pillared Montmorillonite ◽  
Catalytic Isomerization ◽  
Optimum Reaction

In this work, the liquid phase catalytic isomerization of α-pinene over alumina-pillared montmorillonitewas investigated, and the influence of reaction temperature, reaction time and amount of the catalyston the conversion of α-pinenewere discussed systematically, and the optimum reaction conditions forisomerization of α-pineneover alumina-pillared montmorillonitewere obtained. The basal spacing of thealumina-pillared montmorillonite was characterized by X-ray diffraction, and the liquid reactant was separated and identified by gas chromatography. The result showed that alumina-pillared montmorillonite with 1.83nm of basal spacing exhibited a high catalytic activity for the isomerization of α-pinene, and 97.4% conversion of α-pinene was achievedat 373K for 3hwhen the mass ratio of catalyst to α-pinene was 1/10.

Sonochemical Preparation of Ternary Europium Complexes Eu(DBM)3•phen

2011 ◽  
Vol 233-235 ◽  
pp. 2263-2266
Author(s):  
Hong Quan Yu ◽  
Tao Li ◽  
Hong Dan Wang ◽  
Bao Jiu Chen
Keyword(s):  
Close Relation ◽  
Ethanol Solution ◽  
Ultrasonic Power ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Europium Complexes ◽  
X Ray ◽  
Ft Ir ◽  
Europium Chloride ◽  
The Eu

Eu(DBM)3•phen complexes have been Successfully synthesized by the sonication of an Ethanol solution of europium chloride and dibenzoylmethanide (DBM) in the presence of 1,10-phenanthroline(phen). The properties of the Eu(DBM)3•phen complexes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform Infrared spectroscopy (FT-IR) and fluorescence spectrometry (FS). Reaction conditions, such as ultrasonic power and the concentration of complexing reagent, were found to have close relation with the morphologies of final products. The formation mechanism of Eu(DBM)3•phen complexes with ultrasonic irradiation is discussed in the context.

Preparation and Photocatalytic Activity of Laden SiO2/TiO2 Composite Photocatalyst

2011 ◽  
Vol 84-85 ◽  
pp. 504-508
Author(s):  
Ai Yan ◽  
Wen Yan Huang ◽  
Yuan Cai Lv ◽  
Ming Hua Liu
Keyword(s):  
Methylene Blue ◽  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Molar Ratio ◽  
Tetrabutyl Titanate ◽  
High Catalytic Activity ◽  
Optimal Conditions ◽  
Calcination Time ◽  
Composite Photocatalyst ◽  
Repeated Use

SiO2/TiO2 photocatalyst was prepared by a sol-gel method applying tetrabutyl titanate as the precursor and cullets as the carrier. The optimal preparing conditions of the SiO2/TiO2 composite photocatalyst were optimized. The optimal conditions included 2:1 of the molar ratio of tetraethyl orthosilicate to tetrabutyl titanate, 3 load times, 600°C of calcinations temperature, 3 h of calcination time, 3 mL of the dosage of CH3COOH and 5:1 of the molar ratio of water to tetrabutyl titanate. The photodegradation percentage of methylene blue could reach 92.26% under the above optimal conditions. Moreover, after three times of the repeated use, the SiO2/TiO2 composite photocatalyst still had a relatively high catalytic activity and stability, and the recycle percentage of the photocatalyst could reach 92.80%.

scholarly journals Catalytic Oxidative/Extractive Desulfurization of Model Oil using Transition Metal Substituted Phosphomolybdates-Based Ionic Liquids

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 639 ◽  
Author(s):  
Yunlei Li ◽  
Yanjie Zhang ◽  
Panfeng Wu ◽  
Caiting Feng ◽  
Ganglin Xue
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Transition Metal ◽  
Sulfur Removal ◽  
Oxidative Desulfurization ◽  
High Catalytic Activity ◽  
Reaction Conditions ◽  
Extraction Solvent ◽  
Model Oil ◽  
Optimal Reaction

Polyoxometalates based ionic liquids (POM-ILs) exhibit a high catalytic activity in oxidative desulfurization. In this paper, four new POM-IL hybrids based on transition metal mono-substituted Keggin-type phosphomolybdates, [Bmim]5[PMo11M(H2O)O39] (Bmim = 1-butyl 3-methyl imidazolium; M = Co2+, Ni2+, Zn2+, and Mn2+), have been synthesized and used as catalysts for the oxidation/extractive desulfurization of model oil, in which ILs are used as the extraction solvent and H2O2 as an oxidant under very mild conditions. The factors that affected the desulfurization efficiency were studied and the optimal reaction conditions were obtained. The results showed that the [Bmim]5[PMo11Co(H2O)O39] catalyst demonstrated the best catalytic activity, with sulfur-removal of 99.8%, 85%, and 63% for dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT), and benzothiophene (BT), respectively, in the case of extraction combining with a oxidative desulfurization system under optimal reaction conditions (5 mL model oil (S content 500 ppm), n(catalyst) = 4 μmol, n(H2O2)/n(Substrate) = 5, T = 50 °C for 60 min with [Omim]BF4 (1 mL) as the extractant). The catalyst can be recycled at least 8 times, and still has stability and high catalytic activity for consecutive desulfurization. Probable reaction mechanisms have been proposed for catalytic oxidative/extractive desulfurization.

Enhanced Photocatalytic Degradation of Methylene Blue by Using Au-TiO2

2019 ◽  
Vol 886 ◽  
pp. 107-113
Author(s):  
Pongthep Jansanthea ◽  
Weerasak Chomkitichai
Keyword(s):  
Methylene Blue ◽  
Average Crystallite Size ◽  
Average Diameter ◽  
Single Step ◽  
Flame Spray ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Au Nps ◽  
Transmission Electron ◽  
Excellent Photocatalytic Activity

In this work, Au-TiO2 nanoparticles (NPs) were synthesized in a single step by flame spray pyrolysis (FSP) method. X-ray diffraction (XRD) results indicated that phase structures of all samples TiO2 were the mixture of anatase and rutile phases. High resolution transmission electron microscopy (HRTEM) showed that dark spots of Au NPs deposited on larger TiO2 nanoparticles. HRTEM results indicated TiO2 NPs were average crystallite size in the range of 10–30 nm whereas the average diameter of Au NPs was about 5–10 nm. UV–Vis absorption spectroscopy technique showed peaks attributable of surface plasmon resonance (SPR) to Au NPs loaded on TiO2 in the wavelength of 500–630 nm. The Au-TiO2 NPs showed excellent photocatalytic activity for the degradation of methylene blue (MB) under UV-Vis irradiation. It was found that 0.25 mol% Au-TiO2 which was a better photocatalyst than others under the same reaction conditions. The results showed that Au NPs-loading could effectively improve the photocatalytic activities of TiO2.

Hydrothermal Synthesis of Nano-Structured Barium Titanate from Metatitanic Acid

2010 ◽  
Vol 434-435 ◽  
pp. 311-313
Author(s):  
Jing Chu ◽  
Dan Yu Jiang ◽  
Na Zhang ◽  
Min Zhang ◽  
Qiang Li
Keyword(s):  
Phase Composition ◽  
Electron Microscope ◽  
Barium Titanate ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Metatitanic Acid ◽  
Optimal Reaction ◽  
Scanning Electron

Nano-structured Barium Titanate (BaTiO3) was prepared by a hydrothermal method with the reaction between metatitanic acid and an alkaline solution of Ba(OH)2•8H2O. The morphology of as-obtained powders of BaTiO3 was determined by Scanning Electron Microscope, which revealed that well-dispersed nanoparticles were successfully synthesized. The phase composition was analyzed by X-ray diffraction, which shows that cubic phase of Barium Titanate was prepared. The optimal reaction conditions were discussed in detail.

Highly Efficient Degradation of Methylene Blue on Microwave Synthesized FeVO4 Nanoparticles Photocatalysts under Visible-Light Irradiation

2013 ◽  
Vol 372 ◽  
pp. 153-157 ◽  
Author(s):  
Si Jiang Hu ◽  
Juan Yang ◽  
Xue Hong Liao
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Influence Factors ◽  
Treatment Temperature ◽  
Light Irradiation ◽  
X Ray Diffraction ◽  
Solution Ph ◽  
Reaction Conditions ◽  
Degradation Ratio

Ferric vanadate (FeVO4) nanoparticles as visible-light photocatalysts were successfully prepared by microwave irradiation method. The structure and morphology of FeVO4 nanoparticles were charactered by X-ray diffraction (XRD) and scanning electron microscope (SEM). Absorption ranges, which are responsible for the observed photocatalyst behavior, were investigated. Photocatalytic activities of the synthesized samples were examined by studying the degradation of the model dyes Methylene Blue (MB) under visible-light irradiation (400 nm). Various influence factors such as heat treatment temperature of FeVO4, and solution pH values as well as the amount of hydrogen peroxide and FeVO4 catalyst on the photocatalytic degradation of MB were discussed. Results clearly show the degradation ratio can reach 99% under the optimal reaction conditions in dye wastewater treatment in a short photocatalytic reaction time.

Synthesis of Polycarbonate Diol Catalyzed by Metal-Organic Framework Based on Zn2+ and Terephthalic Acid

2013 ◽  
Vol 634-638 ◽  
pp. 608-611
Author(s):  
Li Ping Wang ◽  
Gong Ying Wang ◽  
Fan Wang ◽  
Pin Hua Wang
Keyword(s):  
Terephthalic Acid ◽  
Metal Organic Framework ◽  
Sodium Ethoxide ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Metal Organic ◽  
Polycarbonate Diol ◽  
Double Hydroxide ◽  
Optimal Reaction ◽  
Organic Framework

Metal-organic framework based on Zn2+ and terephthalic acid (TPA) was prepared and characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. It was then used as the catalyst for the transesterification between diphenyl carbonate (DPC) and 1, 6-hexandiol (1,6-HD) to polycarbonate diol (PCDL). Compared to Mg-Al layered double hydroxide, triethylenediamine, sodium ethoxide and sodium methoxide, it exhibits the highest catalytic activity for the synthesis of PCDL. Under optimal reaction conditions(n(1,6-HD)/n(DPC) = 1.2, w(catalyst) = 0.03%, 198 °C), the yield of phenol is up to 90.1% in the transesterification process, and PCDL with higher Mn and lower hydroxyl value can be synthesized

Low-Temperature Synthesis of ZnO Nanoparticles with Controlled Crystal Growth for Efficient Ultraviolet Photocatalyst

2021 ◽  
Vol 897 ◽  
pp. 125-133
Author(s):  
Jun Shan Hu ◽  
Ze Dong Hu ◽  
Zi Qian Wei ◽  
Hao Fu
Keyword(s):  
Crystal Growth ◽  
Low Temperature ◽  
Zno Nanoparticles ◽  
Ultra Violet ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Transmission Electron ◽  
And Performance ◽  
Optimal Reaction

In this paper, we report that an effective and simple chemical method under the low temperature (60 °C) could synthesize zinc oxide (ZnO) nanoparticles and effectively control the crystal growth based on the hydrothermal method. X-ray diffraction, X-ray electron spectroscopy, high resolution transmission electron microscopy and ultra violet visible spectroscopy were used to characterize the structure and performance of the samples. It is shown that the ZnO nanoparticles synthesized under the optimal reaction conditions are strong ultraviolet absorption, high-uniformed sphere and high specific surface. In the photodegradation of rhodamine B (RhB) tests, ZnO nanoparticles thrived well during the reaction and degraded the material in 50 minutes. Since ZnO nanoparticles towards RhB degradation shows a good stability, it might provide an effective way to tackle environmental pollution.

Sign in / Sign up

Export Citation Format

Share Document