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18. Methods of Extracting TiO 2 and Other Related Compounds from Ilmenite.

Author

Sampath, A. H. Janaka, Wickramasinghe, Nadeera Dilshan, de Silva, K. M. Nalin, and de Silva, Rohini M.

Subjects
ILMENITE, TITANIUM dioxide, FUSED salts, TITANIUM oxides, RUTILE, TITANIUM compounds, ROASTING (Metallurgy)
Abstract

Although ilmenite and rutile are extensively used to extract TiO2 at the industrial level, through the sulphate and chloride processes, they can also be recognized to possess the potential to be employed as the raw material to synthesize other titanium compounds as well. The Pulmoddai mineral sand deposit in Sri Lanka is considered as a valuable resource containing pure ilmenite and can be used as a very good source of both titanium and iron. Because of the lower TiO2 content compared to rutile, processes, such as the Becher process, Laporte process and Kataoka process, have been developed to upgrade ilmenite into higher grade synthetic rutile. Additionally, research studies have been carried out to develop methods, such as the hydrochloride process, H3PO4/NH3 process, alkaline roasting process, aluminothermic reduction method, alkaline decomposition method, molten salt electroreduction method and magnesiothermic reduction method, to synthesize TiO2 and other related titanium compounds, such as titanium and iron oxides, composites and alloys, from naturally occurring ilmenite where these methods possess both rewards as well as drawbacks over the others. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Role of Nanotechnology in Diagnosing, Safeguarding, and Treating COVID-19.

Author

Hulugalla, Kenneth, Ranasinghe, Panchali, Williams, Gareth R., Nalin de Silva, K. M., and de Silva, Rohini M.

Subjects
COVID-19, VIRUS diseases, MEDICAL technology, COVID-19 pandemic, NANOTECHNOLOGY, PERSONAL protective equipment
Abstract

Copyright of Sultan Qaboos University Journal for Science is the property of Sultan Qaboos University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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27. Nanofibrous cosmetic face mask for transdermal delivery of nano gold: synthesis, characterization, release and zebra fish employed toxicity studies

Author

Manatunga, D. C., primary, Godakanda, V. U., additional, Herath, H. M. L. P. B., additional, de Silva, Rohini M., additional, Yeh, Chen-Yu, additional, Chen, Jiann-Yeu, additional, Akshitha de Silva, A. A., additional, Rajapaksha, S., additional, Nilmini, Renuka, additional, and Nalin de Silva, K. M., additional

Published
2020
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35. Effective delivery of hydrophobic drugs to breast and liver cancer cells using a hybrid inorganic nanocarrier: A detailed investigation using cytotoxicity assays, fluorescence imaging and flow cytometry

Author

Manatunga, Danushika C., primary, de Silva, Rohini M., additional, de Silva, K.M. Nalin, additional, Malavige, Gathsaurie Neelika, additional, Wijeratne, Dulharie T., additional, Williams, Gareth R., additional, Jayasinghe, Chanika D., additional, and Udagama, Preethi V., additional

Published
2018
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44. Synthesis of multifunctional activated carbon nanocomposite comprising biocompatible flake nano hydroxyapatite and natural turmeric extract for the removal of bacteria and lead ions from aqueous solution.

Author

Chathumal Jayaweera, H. D. A., Siriwardane, Induni, de Silva, K. M. Nalin, and de Silva, Rohini M.

Subjects
ACTIVATED carbon, NANOCOMPOSITE materials, HYDROXYAPATITE, TURMERIC, BACTERIA
Abstract

Clean water, which is free from pathogens and toxic chemicals, is vital to human health. The blue planet is encountering remarkable challenges in meeting the ever-increasing demands of clean water. The intention of this research study was to develop a water filter material that is capable of removing bacterial contaminants and heavy metals from fresh water using cost effective and easily fabricated biocompatible filter material. For this purpose, granular activated carbon (GAC) was coated with both hydroxyapatite (HAP) nanoflakes and turmeric extract (TE) (HAP/TE/ GAC) which had been extracted from natural turmeric powder. In addition, GAC was coated only with HAP nanoflakes to synthesize HAP coated GAC (HAP/GAC) composite. Prepared HAP/GAC and HAP/TE/GAC were characterized using Fourier-transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy and UV-visible spectrophotometry. Antibacterial effect of the prepared nanocomposites, HAP/GAC and HAP/TE/GAC was compared with neat GAC using Gram-negative bacteria Escherichia coli. Results showed that antibacterial studies of the synthesized nanocomposites exhibit effective antibacterial activity against E. coli compared with neat GAC alone. However, the composite HAP/TE/GAC revealed better activity than HAP/GAC. Heavy metal adsorption ability of the synthesized composites was carried out using Pb2+ ions at room temperature at different time intervals and different pH levels. The equilibrium adsorption data were assessed via Langmuir and Freundlich adsorption isotherm models for neat GAC, HAP/GAC and HAP/TE/GAC at pH 6. The equilibrium adsorption data for GAC, HAP/GAC and HAP/TE/GAC were well fitted with both Freundlich and Langmuir isotherm models in the given Pb2+ concentrations. The HAP/TE/GAC composite is capable of maintaining the natural function of GAC in addition to removal of bacterial contaminants and heavy metals, which can be used as a point-of-use water filter material. [ABSTRACT FROM AUTHOR]

Published
2018
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