Comparative study of photocatalytic activity of nano-TiO2 & CNT/TiO2 nano-composite in degradation of organoc dyes.

Advance Materials in Industries 02/2012; 1(1):78.

ABSTRACT The photocatalytic activity of nano-TiO2 is well studied. In this work, we enhanced the photocatalytic activity by forming its composite with multi-walled carbon nanotubes (MWCNTs) since CNTs has an excellent conducting property. A nanocomposite of ‘MWCNTs/TiO2’ was prepared by in situ deposition of vapors from carbonaceous source i.e. Toluene over nano-TiO2 coated film as (MWCNTs) in thermal chemical vapor deposition (CVD) furnace. The nano-TiO2 was prepared by reverse miscellization sol-gel method. The characterizations of nano-TiO2 & MWCNTs/TiO2 nanocomposites were done using various sophisticated analytical techniques such as TEM, XRD, UV-Vis spectroscopy etc. Thus produced MWCNTs/TiO2 nanocomposites were used as the catalysts for photo-degradation of acid azo dyes in presence of UV light. Their photocatalytic efficiency was evaluated by measuring comparative rate of photodegradation of these dyes in an aqueous solution. This study shows that MWCNTs/ TiO2 have enhanced photocatalytic activity compared to that of nano-TiO2 under similar conditions. The degradation efficiency obtained by using MWCNTs/TiO2 is about 18 – 20% higher than nano-TiO2 alone under optimized conditions of temperature, catalyst loading, catalyst activation time, flow rate, substrate concentration etc.


Available from: Vishal Mohan Udmale, May 29, 2015
1 Follower
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The photocatalytic degradation of three commercial textile dyes with different structure has been investigated using TiO(2) (Degussa P25) photocatalyst in aqueous solution under solar irradiation. Experiments were conducted to optimise various parameters viz. amount of catalyst, concentration of dye, pH and solar light intensity. Degradation of all the dyes were examined by using chemical oxygen demand (COD) method. The degradation efficiency of the three dyes is as follows: Reactive Yellow 17(RY17) > Reactive Red 2(RR2) > Reactive Blue 4 (RB4), respectively. The experimental results indicate that TiO(2) (Degussa P25) is the best catalyst in comparison with other commercial photocatalysts such as, TiO(2) (Merck), ZnO, ZrO(2), WO(3) and CdS. Though the UV irradiation can efficiently degrade the dyes, naturally abundant solar irradiation is also very effective in the mineralisation of dyes. The comparison between thin-film coating and aqueous slurry method reveals that slurry method is more efficient than coating but the problems of leaching and the requirement of separation can be avoided by using coating technique. These observations indicate that all the three dyes could be degraded completely at different time intervals. Hence, it may be a viable technique for the safe disposal of textile wastewater into the water streams.
    Journal of Hazardous Materials 02/2002; 89(2-3):303-17. DOI:10.1016/S0304-3894(01)00329-6 · 4.33 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A simple and straightforward approach to prepare TiO2-coated carbon nanotubes (CNTs) is presented. Anatase TiO2 nanoparticles (NPs) with the average size ~8 nm were coated on CNTs from peroxo titanic acid (PTA) precursor even at low temperature of 100 °C. We demonstrate the effects of CNTs/TiO2 molar ratio on the adsorption capability and photocatalytic efficiency under UV-visible irradiation. The samples showed not only good optical absorption in visible range, but also great adsorption capacity for methyl orange (MO) dye molecules. These properties facilitated the great enhancement of photocatalytic activity of TiO2 NPs-coated CNTs photocatalysts. The TiO2 NPs-coated CNTs exhibited 2.45 times higher photocatalytic activity for MO degradation than that of pure TiO2.
    Nanoscale Research Letters 03/2009; 5(3):603-7. DOI:10.1007/s11671-009-9513-5 · 2.52 Impact Factor
  • Source
    Journal of Photochemistry and Photobiology A Chemistry 07/1997; 108(1):1-35. DOI:10.1016/S1010-6030(97)00118-4 · 2.29 Impact Factor