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Pure TiO 2 and CeO 2 -doped TiO 2 (3 % CeO 2 -97 %TiO 2 ) composite nanocrystals were synthesized via co-precipitation method and characterized using TGA, XRD, FTIR, DR-UV-vis and TEM. The XRD data revealed that the phase structure of the synthesized samples was mainly in pure anatase having crystallite size in the range of 7 nm -11 nm. Spherical shapes with moderate aggregation of the crystal particles were observed under the TEM observation. The presence of the CeO 2 at TiO 2 site has not only affected morphologically but also induced the electronic property of the TiO 2 by lowering the band gap energy from 3.29 eV (E g -Ti) to 3.15 eV (E g -CeTi). Performance evaluation of the synthesized samples showed that both samples have a strong adsorption capacity toward Congo red (CR) dye in aqueous solution at room temperature experiment, where the capacity of the CeTi was higher than the Ti sample. Based on DR-UV data, the synthesized samples obtained in this study may also become promising catalysts for photo-assisted removal of synthetic dye in aqueous solution.

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Abstract.1 Comparison of 10% CO 2 -N 2 and 5% CH 4 -Ar gas mixture as a make-up of gas chromatography with electron capture detection (GC-ECD) for the measurement of sulfur hexafluoride (SF 6 ) was investigated. It was found that 10% CO 2 -N 2 shows the make-up characteristic comparable to 5% CH 4 -Ar. Thus, 10% CO 2 -N 2 is considerable as an alternative to 5% CH 4 -Ar.

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