Mekprasart, Wanichaya
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Preferred name
Mekprasart, Wanichaya
Alternative Name
MEKPRASART, Wanichaya
Mekprasart, W.
Main Affiliation
Email
wanichaya.me@kmitl.ac.th
13 results
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Item type:Publication, Characterization and x-ray absorption spectroscopy of ilmenite nanoparticles derived from natural ilmenite ore via acidassisted mechanical ball-milling process(2017-09-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison study of photocatalytic activity of titanium-rich materials derived from natural minerals ores using acidic leaching(2017-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Photocatalytic performance of ball-milled anatase/rutile mixed phase TiO2 composite powders(2016-01-01); Mixed-phase anatase/rutile titanium dioxide (TiO<inf>2</inf>) composite powder is an important material due to the unique properties of photocatalytic activity, which the photocatalytic efficiency of mixed-phase is higher than the only single anatase or rutile phase. In this study, the anatase/rutile mixed phase TiO<inf>2</inf> composite powders were prepared by ball milling of TiO<inf>2</inf> commercial grade powders. Effect of the anatase/rutile phase ratio on photocatalytic performance was investigated. The sample phase ratio is evaluated using X-ray diffraction (XRD) meanwhile the composite morphology is characterized using field emission scanning electron microscope (FE-SEM). The overall results revealed that the mixed-phase anatase/rutile provided significant enhancement in photocatalytic performance compared with only anatase or rutile single phase. In addition, this ballmilling technique is considered an effective process, cost-effectively on energy saving, and suitable for preparing anatase/rutile TiO<inf>2</inf> mixed-phase for photocatalytic application. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Extraction and characterization of nanocellulose from sugarcane bagasse by ball-milling-assisted acid hydrolysis(2018-09-05); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of cobalt dopant on structural and optical properties of co-precipitated TiO2 nanopowders(2016-01-01); The effects of cobalt (Co) addition on structural and optical properties of TiO<inf>2</inf> nanopowders have been investigated. A co-precipitation method was employed to synthesize TiO<inf>2</inf> nanoparticles with various Co additives from 0-10 mol% using tetrabutyl titanate and Cobalt (II) nitrate hexahydrate as starting precursors for Ti and Co source, respectively. The crystallinity of Co-doped TiO<inf>2</inf> nanopowders is heightened by calcination process. The crystal structure, phase formation and the corresponding functional groups of Co-doped TiO2 were analyzed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The scanning electron microscope (SEM) was taken to observe their morphologies. The chemical compositions of Co additive into TiO<inf>2</inf> matrix are confirmed by EDAX. Their optical properties were investigated by diffuse reflectance spectroscopy. Diffuse reflectance spectra of samples exhibit the increasing absorption in visible region with an increasing Co content. The overall characterization results indicated that the crystallinity and optical properties of TiO<inf>2</inf> nanoparticles are significantly affected by Co dopant. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optical absorption and FTIR study of cellulose/tio2hybrid composites(2019-05-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Nonlocal XANES pre-edge feature of FeTiO3 ilmenite-type at Ti and Fe K-edge(2020-09-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Synthesis of low-cost titanium dioxide-based heterojunction nanocomposite from natural ilmenite and leucoxene for electrochemical energy storage application(2018-08-01); Titanium dioxide-based nanocomposites were prepared by simple mixing titanium dioxide with activated ilmenite and leucoxene. Raw ilmenite and leucoxene ore were firstly activated by modified ball-milling process by sulfuric acid assist to obtain activated ilmenite and leucoxene. The mixture between activated ilmenite/leucoxene with commercial anatase titanium dioxide and followed by heat treatment samples demonstrate enhance electrochemical capacitor performance. Phase compositions of prepared samples were confirmed by X-ray diffraction (XRD). The local structure changes were investigated by X-ray absorption spectroscopy (XAS). The particle size and morphology were studied by field emission scanning electron microscope (FE-SEM). The chemical states of the nanocomposites were investigated by X-ray photoelectron spectroscopy (XPS). Electrochemical properties of the prepared nanocomposites were conducted using cyclic voltammetry (CV). Results in this work introduce cost-effectiveness and simple route to prepare electroactive nanocomposite electrode materials from natural ore with enhanced electrochemical capability. The particle size, structure, morphology, heterojunction interface and surface characteristics show significant key to improve electron transfer activity regarding the modification of the specific active sites. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, CPC photocatalytic reactor in presence of immobilized tio 2 and photocatalytic activity(2017-07-01); In this present work, compound parabolic collector (CPC) combined with tubular reactors was designed to accept both directly incident and reflected light. The light collecting of CPC reflecter was analysed via light reflection modeling. Titanium isopropoxide was used as a precursor to prepare immobilized titanium dioxide on the borosilicate beads which was used as supporter. The coated beads were prepared via dip coating technique. The photocatalytic activity of immobilized TiO <inf>2</inf> was performed to decolorize the Rhodamine B dye solution under solar irradiation. UV-Vis spectrophotometer was used to characterize the degradation of rhodamine B dye solution and to analyse the photocatalytic performance. The analysis of reflecting on CPC reflector indicates that all incidents are reflected to reactor tube according to the defined concentration ratio as equal one. The photodegradation of rhodamine B dye solution under solar irradiation is clearly observed by over 90% in presence of immobilized TiO <inf>2</inf> on glass beads. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, ACTIVE-ILMENITE SURFACE STRUCTURE INFLUENCE ON ACID-ASSISTED BALL MILLING(2018-12-01); ; Active-ilmenite powder derived from natural ilmenite sand was prepared by the ball milling process with acid-solution and Deionized (DI) water. Morphology and particle size of active-ilmenite product in acid/DI-assisted ball milling process were monitored by field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). Surface atomic component and chemical bonding were investigated by X-ray photoelectron spectroscopy (XPS). Meanwhile, bulk chemical oxidation and fine structure of active-ilmenite were studied by X-ray absorption near edge structure (XANES) and extended X-ray absorption ne-structure spectroscopy (EXAFS) to confirm the oxidation state and local active species structure at surface. Active-ilmenite by acid-assisted ball milling process is a distinctive method for the preparation of active-ilmenite product with high active surface. Moreover, the distortion of TiO <inf>6</inf> and FeO <inf>6</inf> octahedral cluster on the sample surface was detected in all milled samples with acid-assisted ball milling process. The presence of Fe <sup>2+</sup> , Fe <sup>3+</sup> ions and miniature sulfate was also detected on the sample surface by milled product with acid-assisted method.