Preparation And Characterization Of Carbon Doped Tio2 Using Humic Acid And Its Modified Derivative As Carbon Precursors For Enhanced Photocatalytic Activities

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dc.contributor.authorIsmail, Ismariza
dc.date.accessioned2018-06-26T07:09:02Z
dc.date.available2018-06-26T07:09:02Z
dc.date.issued2011-01
dc.description.abstractTiO2, one of the semiconductor photocatalysts with environmental friendly and economical characteristics had attracted scientific interest over the last 10 years. However, TiO2 can only be activated by UV light corresponding to its large band gap of 3.2 eV. One of the possible approaches in improving the photocatalytic activitiy of TiO2 was via doping of foreign atoms such as non-metallic elements like N, C and S. In this study, carbon doped TiO2 was prepared by using humic acid (HA) and its modified derivative, peat coagulant (PC) respectively, as the carbon precursors. The preparation process of the carbon doped TiO2 (CTHA) from HA and carbon doped TiO2 (CTPC) from PC photocatalysts involves two core stages that are doping and thermal treatment process. The optimum doping percentage was found to be 0.025 % and 0.20 % for the photocatalyst prepared from HA and PC respectively. The optimum treatment temperature for the preparation of the photocatalysts was identified at 650oC for CTHA and 620oC for CTPC photocatalyst. The prepared samples were characterized via SEM-EDX, XRD, BET, CHN, UV-vis, FTIR and photoluminescence analyses. The photocatalytic evaluation of the samples was carried out via photodegradation of an anionic dye, reactive red 4 (RR4) in aqueous suspension under illumination of 45 Watt visible light fluorescent lamp as well as under solar irradiation. First order rate constants (k) for the photodegradation of RR4 with CTHA and CTPC samples under 45 Watt visible light fluorescent lamp irradiation was ca. 0.041 and 0.043 min-1 respectively, which is about four times faster than the unmodified TiO2. On the other hand, similar experiment performed under solar irradiation yielded higher photocatalytic activity with k value ca. 0.168 and 0.191 min-1 respectively using CTHA and CTPC samples. The higher photocatalytic activity exhibited by carbon doped TiO2 samples was attributed to the electron scavenging ability of the carbon particles contained in TiO2.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5787
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectTiO2, one of the semiconductor photocatalysts with environmental friendlyen_US
dc.subjectand economical characteristics had attracted scientific interesten_US
dc.titlePreparation And Characterization Of Carbon Doped Tio2 Using Humic Acid And Its Modified Derivative As Carbon Precursors For Enhanced Photocatalytic Activitiesen_US
dc.typeThesisen_US
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