1. UKM Learning and Research Repository
2. PHD Thesis / Tesis PHD
3. Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Title:	Preparation And Characterization Of Metal And Non-Metal Doped Titania Photocatalysts For Aqueous Dye Pollutant Treatment
Authors:	Silija Padikkaparambil (P49200)
Supervisor:	Zahira Yaakob, Prof. Ir. Dr.
Keywords:	Preparation And Characterization Of Metal And Non-Metal Preparation Of Metal And Non-Metal Doped Titania Photocatalysts Characterization Of Metal And Non-Metal Doped Titania Photocatalysts Titania Photocatalysts For Aqueous Dye Pollutant Treatment Photocatalysis
Issue Date:	18-Apr-2013
Description:	Along with the fast development of industry, assorted issues related to environment are grown into a significant level. The World Bank approximates that, 17 to 20 percent of industrial water pollution comes from textile dyeing. Heterogeneous photocatalysis over titania (TiO2) is a promptly intensifying purification technique for water and air. The relatively high intrinsic band gap of anatase TiO2 (3.2 eV) recommend the use of UV light which consists of only 4-5% of the total solar spectrum. It imparts the need of artificial UV irradiation. Prevention of the recombination of photoexcited electron - hole pairs is the another hurdle in TiO2 based photocatalysis. Considerable efforts have been made to overcome these problems. Present work objective is the development of efficient photocatalysts for dye pollutant degradation by metal and/or non metal doping over TiO2. Anion doping extends the photoactivity to visible region. Noble metal doping is desired for the prevention of electron - hole pair recombination over TiO2 for the effective harvest of the UV light, even from the solar spectrum. This research presents many novel photocatalysts and catalyst preparation methods. Sol gel method of preparation is adopted for material development. Successful preparation of an efficient visible light active photocatalytic system by unique incorporation of carbon and nitrogen into titania using urea as N precursor and ethanol as cosolvent is presented here. The best system with N/Ti molar ratio of 20 provides a degradation of 97% methyleneblue within 2.5 h irradiation. Metal (Ag) doping pick up the catalytic efficiency of the above anion codoped system where the activity in the degradation of methylorange increased from 20% to 77%. Nanogold incorporation over N doped titania shows a synergestic effect in improving the photoactivity of N doped TiO2, where 100% methyleneblue get degraded over a catalyst weight of 2g/l for 3 h irradiation to sunlight. Ag nanoparticle over TiO2 resulted in excellent performance where the dye degradation was more than 95% under the selected conditions. We reported a novel method of silver nanoparticle incorporation into TiO2 sol by means of eco-friendly glucose as the reductant, which provided efficient dispersion of inserted metal in the calcined gel. The system resulted in 100% degradation of dye under selected conditions. In addition, nanogold incorporation is done over undoped TiO2 to prevent the recombination of electron - hole pairs, where the systems are found to be easily separable and the regenerated catalyst showed more than 97% degradation of dye pollutant even after 10 repeated cycles. The present photocatalysts offers an exclusive treatment practice for the degradation of a variety of complex dye pollutants, whereas biochemical oxidation and physical methods leads to secondary pollution.,PhD
Pages:	246
Call Number:	QD716.P45 .P334 2013 3
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.