Effect of organic acids on the physicochemical properties of titania and its photodegradation efficiency of methyl orange

2018 ◽  
Vol 121 ◽  
pp. 367-374 ◽  
Author(s):  
Ipsita Hazra Chowdhury ◽  
Sukanya Kundu ◽  
Milan Kanti Naskar
Keyword(s):  
Methyl Orange ◽  
Organic Acids ◽  
Physicochemical Properties ◽  
Photodegradation Efficiency

scholarly journals The Role of H2C2O4 and Na2CO3 as Precipitating Agents on The Physichochemical Properties and Photocatalytic Activity of Bismuth Oxide

2020 ◽  
Vol 18 (1) ◽  
pp. 129-137
Author(s):  
Yayuk Astuti ◽  
Rizka Andianingrum ◽  
Abdul Haris ◽  
Adi Darmawan ◽  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Physicochemical Properties ◽  
Bismuth Oxide ◽  
Rate Constants ◽  
Degradation Rate ◽  
Precipitation Method ◽  
Methyl Orange Degradation ◽  
Methyl Orange Dye

AbstractSynthesis of bismuth oxide synthesis through the precipitation method using H2C2O4 and Na2CO3 precipitating agents, identification of physicochemical properties and its photocatalysis activity for methyl orange degradation were conducted. The bismuth oxide synthesis was undertaken by dissolving Bi(NO3)3.5H2O in HNO3, then added precipitating agents to form precipitate. The results showed that bismuth oxide produced by H2C2O4 precipitating agent was a yellow powder containing a mixture of α-Bi2O3 (monoclinic) and β-Bi2O3 (tetragonal), porous with size of 28-85 μm. Meanwhile, the use of Na2CO3 as precipitating agent resulted in bismuth oxide consisting of α-Bi2O3 and β-Bi2O3 and Bi2O4, irregular shape without pore being 40-115 μm in size. Bismuth oxide synthesized with H2C2O4 precipitating agent showed higher photocatalytic activity compared to bismuth oxide synthesized using Na2CO3 on degrading methyl orange dye with degradation rate constants of 2.35x10-5 s-1 for H2C2O4 and 1.81x10-5 s-1 for Na2CO3.

Physicochemical properties of cassava, potato and jicama starches oxidised with organic acids

2007 ◽  
Vol 87 (7) ◽  
pp. 1207-1214 ◽  
Author(s):  
Fernando Martínez-Bustos ◽  
Silvia Lorena Amaya-Llano ◽  
J Antonio Carbajal-Arteaga ◽  
Yoon Kil Chang ◽  
José de J Zazueta-Morales
Keyword(s):  
Organic Acids ◽  
Physicochemical Properties

SIGNIFICANT EFFECT OF PH ON PHOTOCATALYTIC DEGRADATION OF ORGANIC POLLUTANTS USING SEMICONDUCTOR CATALYSTS

2016 ◽  
Vol 78 (8-3) ◽  
Author(s):  
Nur Farhana Jaafar ◽  
Aishah Abdul Jalil ◽  
Sugeng Triwahyono ◽  
Adnan Ripin ◽  
Mohamad Wijayanuddin Ali
Keyword(s):  
Carbon Dioxide ◽  
Methyl Orange ◽  
Physicochemical Properties ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Ph Value ◽  
Effect Of Ph ◽  
Electrolysis Method ◽  
Ph Range ◽  
Positively Charged

Photocatalytic is one of the inexpensive and non-toxic techniques for degradation of organic pollutants into harmless substances such as water and carbon dioxide. In this study, simple electrolysis method was used in preparation of Ag/TiO2 and α-Fe2O3/HY catalysts. The physicochemical properties of the catalysts were studied using XRD, FTIR, FESEM-EDX and surface area analysis. The pH of solution plays an important role in the photocatalytic degradation of organic pollutants which influences the surface-charge properties of the catalysts. Ag/TiO2 and α-Fe2O3/HY were used as catalyst on degradation of 2-chlorophenol (2-CP) and methyl orange (MO), respectively. The effect of pH on degradation of 2-CP and MO were investigated over a pH range from 2 to 9. Higher degradation of 2-CP and MO were obtained at pH 5 (74%) and pH 2 (80%), respectively. This finding might be explained by the amphoteric performance of the catalyst using point zero charge (pHZPC). The pHZPC for Ag/TiO2 and α-Fe2O3/HY was found to be at pH 6.3 and pH 7.2, respectively. Hence, the activities of the catalysts may have been affected by the existence of a strong electrostatic field between the positively charged catalysts surface and negatively charged 2-CP and MO caused a pH value lower than their pHZPC give greater degradation.

scholarly journals Effect of Solid Forms on Physicochemical Properties of Valnemulin

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 675 ◽  
Author(s):  
Jinbo Ouyang ◽  
Jian Chen ◽  
Limin Zhou ◽  
Fangze Han ◽  
Xin Huang
Keyword(s):  
Organic Acids ◽  
Physicochemical Properties ◽  
Excess Enthalpy ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Scanning Calorimetry ◽  
Intrinsic Dissolution ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

To improve the physicochemical properties of valnemulin (VLM), different solid forms formed by VLM and organic acids, including tartaric acid (TAR), fumaric acid (FUM), and oxalic acid (OXA), were successfully prepared and characterized by using differential scanning calorimetry (DSC), scanning electron microscope (SEM), X-ray powder diffraction (XRPD), and Fourier-transform infrared spectroscopy (FT-IR). The excess enthalpy Hex between VLM and other organic acids was calculated by COSMOthermX software and was used to evaluate the probability of forming multi-component solids between VLM and organic acids. By thermal analysis, it was confirmed that multi-component solid forms of VLM were thermodynamically more stable than VLM itself. Through dynamic vapor sorption (DVS) experiments, it was found that three multi-component solid forms of VLM had lower hygroscopicity than VLM itself. Furthermore, the intrinsic dissolution rate of VLM and its multi-component forms was determined in one kind of acidic aqueous medium by using UV-vis spectrometry. It was found that the three multi-component solid forms of VLM dissolved faster than VLM itself.

Research on Visible Light Photocatalytic Performance of Tungsten Doped TiO2

2011 ◽  
Vol 236-238 ◽  
pp. 399-402
Author(s):  
Dao Xin Wu ◽  
Zhou Lan Yin ◽  
Qi Yuan Chen ◽  
Jie Li ◽  
Ke Long Huang
Keyword(s):  
Methyl Orange ◽  
Low Temperature ◽  
Visible Light ◽  
Crystalline State ◽  
Photocatalytic Performance ◽  
Catalyst Concentration ◽  
Tetrabutyl Titanate ◽  
Photodegradation Efficiency ◽  
Rutile Titania ◽  
Visible Light Photocatalytic

In this paper, W-doped rutile titania was prepared by low temperature hydrolysis using Tetrabutyl titanate. Powers were characterized by XRD、DRS、PL. At 1073K, Doped concentration have been in a certain range, Tungsten could be doped into the lattice of rutile TiO2in the way of replacement, which would cause no change in rutile TiO2crystalline state with sunlight as the light source, pH=2.0, catalyst concentration was 1.0g.L-1, concentration of methyl orange was 5.0mg.L-1. It has been shown that Tungsten doped TiO2powders(1.0%,1073K) has been the most photodegradation efficiency, and the degradation efficiency was 96.8% after 12h.

scholarly journals Synthesis of Ag/ZnO Photocatalysts for the Photodegradation of Methyl Orange Dye

2021 ◽  
Vol 2 (1) ◽  
pp. 61-69
Author(s):  
Abdul Halim Abdullah ◽  
Elisa Rasouli ◽  
Ernee Noryana Muhamad ◽  
Pooneh Kia
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Physicochemical Properties ◽  
Photocatalytic Performance ◽  
Hexagonal Phase ◽  
Characterization Techniques ◽  
Methyl Orange Dye ◽  
Degradation Of Methyl Orange

ZnO and a series of Ag/ZnO photocatalysts were prepared by a precipitation- irradiation method and their photocatalytic performance in photodegradation of methyl orange dye was evaluated. The physicochemical properties of the catalysts were characterized by various characterization techniques. The photocatalysts have a hexagonal phase and were highly agglomerated. TEM images showed a change in morphology of ZnO from rod to nearly spherical with the addition of Ag. Ag/ZnO catalysts exhibited better photocatalytic activity in the degradation of methyl orange compared to pure ZnO. Ag/ZnO contains 2% silver shows the best performance as photocatalyst.

scholarly journals Nanostructured TiO2 Sensitized with MoS2 Nanoflowers for Enhanced Photodegradation Efficiency toward Methyl Orange

ACS Omega ◽  
2021 ◽  
Author(s):  
Sagar V. Kite ◽  
Abhijit Nanaso Kadam ◽  
Dattatraya J. Sathe ◽  
Satish Patil ◽  
Sawanta S. Mali ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Nanostructured Tio2 ◽  
Photodegradation Efficiency

scholarly journals Physicochemical Properties of TiO2 Nanoparticle Loaded APTES-Functionalized MWCNTs Composites and Their Photocatalytic Activity with Kinetic Study

2018 ◽  
Author(s):  
Amirah Ahmad ◽  
Mohd Hasmizam Razali ◽  
Mazidah Mamat ◽  
Karimah Kassim ◽  
Khairul Anuar Mat Amin
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Physicochemical Properties ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Titania Nanoparticles ◽  
Order Kinetic ◽  
Composite Powders ◽  
Functionalized Mwcnts ◽  
Degradation Of Methyl Orange

In this study, functionalized-MWCNTs with 3-aminopropyltriethoxysilane (APTES) loaded titania nanoparticles (MWCNTs-APTES-TiO2) were prepared to investigate their physicochemical properties and photocatalytic activity for methyl orange (MO) degradation. The TiO2 nanoparticles, functionalized-MNCNT and composite powders were characterized by XRD, raman, and TEM. The results obtained proved that titania (TiO2) nanoparticles was successfully loaded on APTES-MWCNTs. The best photocatalytic degradation of methyl orange solution under UV light irradiation was recorded over MWCNTs-APTES-TiO2 (1:2), with 87% after 180 min. Kinetic analysis indicated that photocatalytic degradation of MO solution by MWCNTs-APTES-TiO2 obeyed second-order kinetic model (R2 > 0.95), supported by half-life equations and graph. The presence of carbon nanotubes accelerated the degradation of methyl orange due to inhibition of electron-hole recombination, the formation of additional hydroxyl radicals and functional groups of the latter had an inhibitory effect on the degradation of methyl orange. This study shows that the MWCNTs-APTES-TiO2 nanocomposites exhibit promising photocatalytic degradation against methyl orange.

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