Cover Image

Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania

In this work, methyl ß-cyclodextrin (Mß-CD) was used to increase the solubility of turmeric rhizome oleoresin (TRO) in aqueous solution by forming inclusion complexes, and the technique was combined with microwave-assisted extraction (MAE) to extract the curcuminoids from Curcuma domestica Val. Opti...

Full description

Saved in:
Bibliographic Details
Main Authors: Che Mi, Salasiah, Hadi Nur, Hadi Nur, Lee, Siew Ling
Format: Article
Language:English
Published: Penerbit UTM Press 2015
Subjects:
QD Chemistry
Online Access:http://eprints.utm.my/id/eprint/60346/1/HadiNur2015_NovelOxidativeAcidicBifunctionalCatalystOfTungstenPhosphate.pdf
http://eprints.utm.my/id/eprint/60346/
http://dx.doi.org/10.11113/mjfas.v11n3.381
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.utm.60346
record_format eprints
spelling my.utm.603462022-04-05T03:43:57Z http://eprints.utm.my/id/eprint/60346/ Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania Che Mi, Salasiah Hadi Nur, Hadi Nur Lee, Siew Ling QD Chemistry In this work, methyl ß-cyclodextrin (Mß-CD) was used to increase the solubility of turmeric rhizome oleoresin (TRO) in aqueous solution by forming inclusion complexes, and the technique was combined with microwave-assisted extraction (MAE) to extract the curcuminoids from Curcuma domestica Val. Optimized conditions for the MAE were microwave power of 700 W, extraction particle size of 0.30–0.60 mm, extraction time of 3 min, solvent volume of 10 mL, 2 g of sample, and extraction temperature of 60 °C. High-performance liquid chromatography was used for the determination of the curcuminoids. Phase solubility study was conducted to investigate the association of Mß-CD with TRO using curcumin, the major curcuminoid, as a marker compound to represent turmeric oleoresin. The curcumin recovery was increased due to its complexation with Mß-CD. Linear host–guest correlation with slope of <1 indicated a stoichiometry of 1:1 Mß-CD-complex, and with this assumption, the stability constant, KC, was calculated as 515.19 M-1. Meanwhile, the molar ratio needed for inclusion complexation between TRO/Mß-CD was 1:2. Attenuated total reflectance Fourier transform infrared spectroscopy results revealed that the MAE application for the co-precipitation, physical, and kneading methods can all be used for complexation.A novel oxidative-acidic bifunctional catalyst of silica-titania supported tungsten-phosphate was successfully synthesized and characterized. Different tungsten amount was impregnated into silica-titania followed by phosphoric acid treatment via sol gel method. The impregnation of WO3 and PO43- into TiO2-SiO2 followed by drying and calcination gave the white colour to the samples. X-ray diffractograms of the samples showed the structures of TiO2-SiO2 remained as amorphous structure after loading of WO3 and PO43-. The catalytic performance of the samples of PO43-/xW/TiO2-SiO2, (x = 1 and 5 wt %) as bifunctional catalyst in the formation of 1,2-octanediol through conversion of 1-octene to 1,2-epoxyoctane using aqueous H2O2 as an oxidant was evaluated. It has been demonstrated that PO43-/5W/TiO2-SiO2 was an active bifunctional oxidative-acidic catalyst in producing 1,2-octanediol from 1-octene. Penerbit UTM Press 2015 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/60346/1/HadiNur2015_NovelOxidativeAcidicBifunctionalCatalystOfTungstenPhosphate.pdf Che Mi, Salasiah and Hadi Nur, Hadi Nur and Lee, Siew Ling (2015) Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania. Malaysian Journal of Fundamental and Applied Sciences, 11 (3). pp. 122-125. ISSN 2289-5981 http://dx.doi.org/10.11113/mjfas.v11n3.381
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QD Chemistry
spellingShingle QD Chemistry
Che Mi, Salasiah
Hadi Nur, Hadi Nur
Lee, Siew Ling
Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
description In this work, methyl ß-cyclodextrin (Mß-CD) was used to increase the solubility of turmeric rhizome oleoresin (TRO) in aqueous solution by forming inclusion complexes, and the technique was combined with microwave-assisted extraction (MAE) to extract the curcuminoids from Curcuma domestica Val. Optimized conditions for the MAE were microwave power of 700 W, extraction particle size of 0.30–0.60 mm, extraction time of 3 min, solvent volume of 10 mL, 2 g of sample, and extraction temperature of 60 °C. High-performance liquid chromatography was used for the determination of the curcuminoids. Phase solubility study was conducted to investigate the association of Mß-CD with TRO using curcumin, the major curcuminoid, as a marker compound to represent turmeric oleoresin. The curcumin recovery was increased due to its complexation with Mß-CD. Linear host–guest correlation with slope of <1 indicated a stoichiometry of 1:1 Mß-CD-complex, and with this assumption, the stability constant, KC, was calculated as 515.19 M-1. Meanwhile, the molar ratio needed for inclusion complexation between TRO/Mß-CD was 1:2. Attenuated total reflectance Fourier transform infrared spectroscopy results revealed that the MAE application for the co-precipitation, physical, and kneading methods can all be used for complexation.A novel oxidative-acidic bifunctional catalyst of silica-titania supported tungsten-phosphate was successfully synthesized and characterized. Different tungsten amount was impregnated into silica-titania followed by phosphoric acid treatment via sol gel method. The impregnation of WO3 and PO43- into TiO2-SiO2 followed by drying and calcination gave the white colour to the samples. X-ray diffractograms of the samples showed the structures of TiO2-SiO2 remained as amorphous structure after loading of WO3 and PO43-. The catalytic performance of the samples of PO43-/xW/TiO2-SiO2, (x = 1 and 5 wt %) as bifunctional catalyst in the formation of 1,2-octanediol through conversion of 1-octene to 1,2-epoxyoctane using aqueous H2O2 as an oxidant was evaluated. It has been demonstrated that PO43-/5W/TiO2-SiO2 was an active bifunctional oxidative-acidic catalyst in producing 1,2-octanediol from 1-octene.
format Article
author Che Mi, Salasiah
Hadi Nur, Hadi Nur
Lee, Siew Ling
author_facet Che Mi, Salasiah
Hadi Nur, Hadi Nur
Lee, Siew Ling
author_sort Che Mi, Salasiah
title Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
title_short Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
title_full Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
title_fullStr Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
title_full_unstemmed Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
title_sort novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania
publisher Penerbit UTM Press
publishDate 2015
url http://eprints.utm.my/id/eprint/60346/1/HadiNur2015_NovelOxidativeAcidicBifunctionalCatalystOfTungstenPhosphate.pdf
http://eprints.utm.my/id/eprint/60346/
http://dx.doi.org/10.11113/mjfas.v11n3.381
_version_ 1729703258860027904
score 13.211869

Similar Items