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Mftah A.,Universiti Malaysia Pahang | Alhassan F.H.,Catalysis Science and Technology Research Center | Alhassan F.H.,University Putra Malaysia | Al-Qubaisi M.S.,University Putra Malaysia | And 8 more authors.
International Journal of Nanomedicine | Year: 2015

Nanoparticle sulphated zirconia with Brønsted acidic sites were prepared here by an impregnation reaction followed by calcination at 600°C for 3 hours. The characterization was completed using X-ray diffraction, thermal gravimetric analysis, Fourier transform infrared spectroscopy, Brunner-Emmett-Teller surface area measurements, scanning electron microscopy with energy dispersive X-ray spectroscopy, and transmission electron microscopy. Moreover, the anticancer and antimicrobial effects were investigated for the first time. This study showed for the first time that the exposure of cancer cells to sulphated zirconia nanoparticles (3.9–1,000 µg/mL for 24 hours) resulted in a dose-dependent inhibition of cell growth, as determined by (4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays. Similar promising results were observed for reducing bacteria functions. In this manner, this study demonstrated that sulphated zirconia nanoparticles with Brønsted acidic sites should be further studied for a wide range of anticancer and antibacterial applications. © 2015 Mftah et al. Source


Sivasangar S.,Catalysis Science and Technology Research Center | Sivasangar S.,University Putra Malaysia | Taufiq-Yap Y.H.,Catalysis Science and Technology Research Center | Taufiq-Yap Y.H.,University Putra Malaysia | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2013

Utilization of lignocellulosic material via thermo-chemical processes has received huge attention from both biofuel and biochemical sectors. Intensive research has been embarked to study the thermal behavior and the decomposition patterns of the potential feedstock materials. Palm plantation waste, empty palm fruit's bunches (EFB) are used as a biomass source in this experiment. A comparison study was made using basic lignocellulosic model compounds such as hemicellulose, cellulose, and lignin. The thermal stability of each compound in both oxygen and nitrogen environments was investigated. The degradation of model compounds were categorized into primary (200-400 C) and secondary (500-800 C) stages based on structural collapse and liquid/solid decompositions. Besides, the influence of inorganic substances in EFB degradation was reported whereby the mineral contents act as a catalyst by enhancing the decomposition at lower temperatures compared to demineralized EFB. In addition, the product gas evolutions from the gasification reaction of the components were analyzed using online mass spectrometer. The gas production patterns indicate the nature of the compounds in terms of thermal stability, functional group cleavages and catalytic reactions. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights. Source

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