Synthesis and Characterization of Ag-Decorated TiO2 Nanoparticles for Photocatalytic Application

TiO2 nanoparticles (TiO2) and Ag-doped TiO2 nanocomposites (Ag-TiO2) were synthesized by the Sol-Gel process using titanium tetra isopropoxide as TiO2 and AgNO3 as Ag precursors, respectively. The synthesized nanocomposites were characterized by XRD, SEM, TEM, FT-IR, and UV­-Visible analysis. The XRD results show that Ag doping increases the grain size from 22 nm to 36 nm. From the UV-Visible spectra, the redshift in absorbance was observed, which indicates the increase in grain size and it reduces the bandgap. The TEM analysis shows that all the particles are exhibited in the nanometer range. The synthesized nanoparticles show good photocatalytic activity, and they decompose the methyl orange dye within 5 hours.

The Effect of Acidity and Rotation Speed in Titanium Dioxide Synthesize Process

The aims of this study are to analyze the effect of acidity and rotational speed in the synthesis of TiO2 using the sol-gel method and to analyze the morphology of synthesized TiO2 nanoparticles and commercial TiO2 using XRD to produce semiconductors for Dye-Sensitized Solar Cell (DSSC) applications. The sol-gel method was used to synthesize TiO2 Nanoparticles. Titanium tetra-isopropoxide (TTIP) was used as a precursor with the variable of the magnetic stirrer rotation speed of 500, 1000 and 1500 rpm. Acidification was achieved by adding acetic acid to Sol-gel solution to produce a pH number of 1, 2, and 3. Nanomaterial was observed with an optical microscope and X-ray Powder Diffraction (X-RD) to determine the morphology and phase of TiO2 crystalline. The results showed that the rotational speed and acidity level of the Sol-gel solution ware played an important role to get the best form of a nanoparticle. At a rotation speed of 1500 rpm with pH 3 and 1000 rpm with pH 2 ware shown characteristics similar to commercial TiO2. In addition to that, the results of XRD characterization of synthesized TiO2 was shown a crystal phase of anatase structure with 18,046 nm crystal size compared to commercial TiO2 with anatase structure and crystal size of 15,554 nm.

Methyl Orange Degradation using TiO2 Powder and Immobilized TiO2 Photocatalysts

Methyl orange is one of the anionic dyes and is a major pollutant from textile industry that enters both aquatic and atmospheric systems. In this research, methyl orange was degraded using TiO2 powder and immobilized TiO2 on glass. Titanium tetra-isopropoxide (TTIP) was used for preparation of TiO2 powder using soft chemistry method, and it was immobilized on glass via paste-gel coating method. The prepared photocatalysts were characterized by XRD and SEM. Highly crystalline anatase TiO2 powder photocatalyst was obtained. Meanwhile, immobilized TiO2 was less crystalline and agglomerated onto the glass surface. TiO2 powder had higher degradation rate (71%) compared to immobilized TiO2 (52%) due to its chemical stability and larger amount of photocatalyst contacted with methyl orange during the degradation process.

Hydrothermal Sol-gel TiO2 Nanoparticles fixed to Clay and its Photocatalytic Application for the Degradation of Methyl Orange

In this paper, Clay-TiO2 nanomaterials were synthesized via hydrothermal sol-gel method using Ivorian clays and titanium tetra-isopropoxide as precursors. The synthesized composite was characterized through XRD, SEM/EDX, FTIR and BET surface measurements. The photocatalytic activity of composite towards the degradation of methyl orange (MO), a model pollutant, has been investigated under UV and simulated solar radiation. Comparative experiments done in a solution with and without H2O2 indicate an increase in efficiency for methyl orange removal from the polluted water in the presence of H2O2. The optimized parameters (contact time, amount of nanocomposite and amount of Fe2+/H2O2) allowed to reach removal efficiency up to 60 % of MO. Immobilization of TiO2 on clay facilitate repeated using of nanomaterials, two time.

Synthesis, Characterization and in vitro Antimicrobial, Antioxidant and Anticancer Activity of Random Copolyester Using 1,4-Dithiane-2,5-diol

A random copolyester was prepared by direct melt polycondensation method using 1,4-dithiane-2,5-diol, 1,4-cyclohexane diol and Sebacic acid in the mole ratio 1:1:2 using titanium tetra isopropoxide as catalyst. The synthesized copolyester poly(1,4-dithiane-2,5-diol sebacate–co–1,4-cyclohexane diol sebacate) (PDCSe) was characterized by FT-IR, 1H NMR and 13C NMR to determine the chemical structure, while wide angle XRD, differential scanning spectroscopy and Inherent viscosity were determined to study its physical properties. Further the antioxidant, antimicrobial and anticancer activities of the synthesized copolyester were determined to study its biological property.

Synthesis and Characterization of TiO2 Nanoparticles for Solar Cell Applications

Titanium dioxide (TiO2 ) nanoparticles were synthesized using three different approaches successfully. These approaches were adopted as per different applications of TiO2 nanoparticles. These samples were characterized using X- ray diffraction (XRD) technique. XRD revealed nanocrystalline regime of TiO2 nanoparticles in each approach. The calculated size of nanoparticle was less than 11 nm in the used chemical approaches. Prominent and broad peaks were observed in XRD pattern for all samples, which showed all samples were in nanocrytalline form. The particle size was calculated for first three most intense prominent XRD peaks. By adopting sol gel method using Titanium tetra isopropoxide (TTIP) as precursor, the synthesized Titania particles were pure anatas and of size 7 to 11nm and using co-precipitation method using TiCl3 as precursor synthesized Titania were pure rutile and of size 3 to 7 nm. The co-precipitation method has been best suited for getting smaller nanoparticles. It was also observed that Solid state mechanical reduction root can be used to reduce the size of Titania micro-particles up to about 60 nm but phase of nanoparticles remains same as starting microparticles. It has been seen that the material properties of TiO2 can be tuned by proper method of synthesis. The work may play important role to choose particular synthesis method for specific application. These nano synthesized TiO2 materials may be used in a wide range of applications such as dye sensitized solar cell, photocatalysis, antibacterial, environment pollutant removal and photoactivated self cleaning properties etc

Optimization of Rhodamine B Decolorization by Adsorption and Photoelectrodegradation Combination System

<p>A combination of adsorption and photoelectrodegradation system was performed to reduce the concentration of Rhodamine B dye in water.<strong> </strong>The adsorption was conducted using silica and alumina activated by acid and base under various predetermined pH of Rhodamine B. The photoelectrodegradation process was performed using Ti/TiO₂ electrode as a cathode and Ti/TiO₂-NiO as an anode. TiO₂ was synthesized from titanium tetra-isopropoxide precursor (TTiP) by sol-gel method. TiO₂-NiO composite was synthesized with the same precursor with the addition of Ni(NO₃)₂.6H₂O. The result shows that the activation changes the amount of OH total in the adsorbent. The acid-activated adsorbent showed an optimum adsorption activity when Rhodamine B was in base condition caused by zwitter ionic structure. It reversely occured to base-activated adsorbent where an optimum absorption activity reached at acid condition. The application of base-activated silica in adsorption and photoelectrodegradation combination system decreased the concentration of Rhodamine B dye up to 98.79% using photoanode Ti/TiO₂-NiO under pH 2 at bias potential 6 V.</p>

Methyl Violet Degradation Using Photocatalytic and Photoelectrocatalytic Processes Over Graphite/PbTiO3 Composite

Photocatalytic and photoelectrocatalytic degradation of methyl violet dye using Graphite/PbTiO3 composites has been conducted. The purposes of this research were to examine photocatalytic and photoelectrocatalytic degradation of methyl violet using Graphite/PbTiO3 composite. Synthesis of Graphite/PbTiO3 composite was successfully performed via sol-gel method by mixing graphite powder, titanium tetra isopropoxide precursor solution (TTIP) and Pb(NO3)2. The Graphite/PbTiO3 composites were characterized using X-Ray Diffraction (XRD), Fourier Transform-Infra Red (FT-IR), and Scanning Electron Microscopy (SEM). The XRD diffractogram and IR spectrum of Graphite/PbTiO3 composite revealed all characteristic peak of graphite and PbTiO3. Photocatalytic degradation process showed that Graphite/PbTiO3 composite with ratio 1/1 decreased concentrations of methyl violet up to 92.20 %. While photoelectrocatalytic degradation processed for 30 minutes at neutral pH and 10 V voltage degraded the methyl violet until 94 %. However, the photoelectrocatalysis is still not significance to improve methyl violet degradation compared with photocatalysis. Copyright © 2018 BCREC Group. All rights reservedReceived: 19th July 2017; Revised: 8th September 2017; Accepted: 8th September 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Purnawan, C., Wahyuningsih, S., Nawakusuma, V. (2018). Methyl Violet Degradation Using Photocatalytic and Photoelectrocatalytic Processes Over Graphite/PbTiO3 Composite. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 127-135 (doi:10.9767/bcrec.13.1.1354.127-135)

Effect of molarity on sol–gel routed nano TiO2 thin films

The nanostructured titanium dioxide (TiO[Formula: see text] thin films have been prepared for the molar concentrations of titanium tetra isopropoxide (TTIP) 0.05[Formula: see text]M, 0.1[Formula: see text]M, 0.15[Formula: see text]M and 0.2[Formula: see text]M by sol–gel routed spin coating technique with calcination at 450[Formula: see text]C. The processing parameters such as, pH value (8), catalyst HCl (0.1[Formula: see text]ml), spin speed (3000[Formula: see text]rpm) and calcination temperature (450[Formula: see text]C) are optimized. The crystalline nature and surface morphology were analyzed by XRD, SEM and AFM analysis. The XRD results confirm that the films are crystalline with anatase phase, and are nanostructured. The SEM micrographs of the TiO2 film reveal the spherical nature of the particle. AFM analysis establishes that the uniformity of the TiO2 thin film was optimized at 0.2[Formula: see text]M. The optical measurements show that the transmittance depends on the molarity, and the optical band gap energy of TiO2 films is found to be inversely proportional to molarity. The I–V characteristics exhibit that the molarity strongly influences the electrical conductivity of the film. The results indicate that the significant effect of molarity on structural, optical and electrical properties of the nanostructured TiO2 thin films will be useful to photovoltaic application.

SINTESIS DAN KARAKTERISASI PARTIKEL NANOSPERIK TIO2 MELALUI METODE HIDROTERMAL GELOMBANG MIKRO

ABSTRACTSimple synthesis of nanospherical TiO2 by microwave hydrothermal method has beeninvestigated. Titanium tetra isopropoxide (TTIP) and tetra methyl ammonium hydroxide(TMAOH) were used as precursor. The crystal phase and microstructure were characterized byX-Ray Diffraction (XRD) and transmission electron microscopy (TEM) including selected areadiffraction (SAED). The presence of intense peak in the XRD patterns confirmed to anatase andin good agreement with SAED patterns. Nanospherical of particles were clearly seen in theTEM image and the size of particles was approximately 4-5 nm.Keywords : microwave hydrothermal, colloidal titanates, structure directing agent,nanospherical TiO2