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Kumaresan Loganathan,Palanisamy Bommusamy,Palanichamy Muthaiahpillai,Murugesan Velayutham 대한환경공학회 2011 Environmental Engineering Research Vol.16 No.2
Different weight percentages of Ag, Pt, and Au doped nano TiO₂ were synthesized using the acetic acid hydrolyzed sol-gel method. The crystallite phase, surface morphology combined with elemental composition and light absorption properties of the doped nano TiO₂ were comprehensively examined using X-ray diffraction (XRD), N2 sorption analysis, transmission electron microscopic (TEM), energy dispersive X-ray, and DRS UV-vis analysis. The doping of noble metals stabilized the anatase phase, without conversion to rutile phase. The formation of gold nano particles in Au doped nano TiO₂ was confirmed from the XRD patterns for gold. The specific surface area was found to be in the range 50 to 85 m2/g. TEM images confirmed the formation a hexagonal plate like morphology of nano TiO₂. The photocatalytic activity of doped nano TiO₂ was evaluated using 4-chlorophenol as the model pollutant. Au doped (0.5 wt %) nano TiO₂ was found to exhibit higher photocatalytic activity than the other noble metal doped nano TiO₂, pure nano TiO₂ and commercial TiO₂ (Degussa P-25). This enhanced photocatalytic activity was due to the cathodic influence of gold in suppressing the electron-hole recombination during the reaction.
Self-Assembly Growth of Electrically Conductive Chitosan Nanofibrous Scaffold
Dhanusuraman Ragupathy,김한도,Palanisamy Gomathi,Loganathan Kumaresan,이수출,Salem S. Al-Deyab,이상학 한국고분자학회 2012 Macromolecular Research Vol.20 No.10
We report on the synthesis of an electrically conductive chitosan nanofibrous scaffold (NFS) by a “simple template free self-assembly method’’ from biopolymer chitosan in the presence of inorganic acids as dopants and ammonium persulphate (APS) as an initiator. The morphology of the chitosan nanofibers scaffold (CS-NFS) was examined by field emission scanning electron microscopy (FE-SEM). Physiochemical characterizations of the CSNFS were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis. It is found that the morphology and structure of the CS-NFS strongly depend on the kinds of dopant used. Cyclic voltammogram measurement reveals that CS nanofibers have high electrocatalytic activity compared to chitosan powder. The CS nanofibers are expected to be useful in electrical, optical, and electrochemical devices.
Ponnusamy Senthil Kumar,Maria Jacob Stani Raja,Mahathevan Kumaresan,Dinesh Kumar Loganathan,Prabhakaran Chandrasekaran 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
The removal of basic dye such as methylene blue (MB) dye from the synthetic wastewater was experimentallyinvestigated using an electrolytic cell (EC), adsorption and the combined effect of EC and adsorption technologycalled a three-phase three-dimensional electrode reactor (TPTDER). The performance of the each technology was checkedon the basis of the efficiency of the systems. The experimental results are expressed in terms of the removal efficiencyof the dye molecules. The results show that the TPTDER could efficiently remove the dye molecules from the aqueoussolutions when compared with the EC and adsorption process. The removal efficiency reached as high as about 99%for an initial MB dye concentration in the range of 100-1,000 mg/L by TPTDER for 10 min at 12 V cell voltage andat specific airflow conditions. It was also observed that the removal of dye molecules depends upon the initial solutionpH, applied cell voltage, contact time, and initial dye concentration. The recyclability of the particle electrodes in theTPTDER process was also checked. These findings suggest that TPTDER is a promising technology for the removalof dyes from the aqueous solution, and can be applied to the removal of dyes from the industrial effluents.