02261nas a2200265   4500008004100000022001400041245009400055210006900149260007300218300001100291490000800302520135300310653002601663653002201689653001801711653001801729653002101747100002101768700001801789700002001807700001701827700001701844700001701861856011701878       2012                        eng d  a0926-860X00aEnhanced photocatalytic activity of multi-doped TiO2 for the degradation of methyl orange0 aEnhanced photocatalytic activity of multidoped TiO2 for the degr  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a96-1020 v4433 a<p>We report the synergistic effect of dopants like Gd, N and Sin enhancing the photocatalytic activity of TiO2. Nanosized TiO2 doped at both cationic and anionic sites by Gd, N and S exhibited increased photocatalytic activity compared to TiO2 doped with either Gd or N and S. All the doped TiO2 existed as anatase phase and no separate phase due to Gd2O3 was seen up to a Gd concentration of 2%. The particle size as seen from the transmission electron micrograph was similar to 25 nm. The optical absorption property of TiO2 was improved by doping and redshift of the absorption edge is seen for all doped samples compared to pristine TiO2. The red shift of the absorption edge was the highest for the multiple ion-doped sample. Presence of bonded N and S in TiO2 was detected by X-ray photoelectron spectroscopy. Fluorescence lifetime studies indicated an enhanced lifetime for the charge carriers in the doped system compared to pristine TiO2. Photocatalytic activity study showed that the multi-doped sample has the highest activity for the degradation of methyl orange compared to Gd-TiO2, NS-TiO2 and pristine TiO2. The enhanced photocatalytic activity of the multi-doped TiO2 is attributed to factors such as improved optical absorption property and improved lifetime of the charge carriers. (C) 2012 Elsevier B.V. All rights reserved.</p>10aFluorescence lifetime10aGd N S doped TiO210aMethyl orange10aPhotocatalyst10aPhotodegradation1 aCharanpahari, A.1 aUmare, S., S.1 aGokhale, S., P.1 aSudarsan, V.1 aSreedhar, B.1 aSasikala, R.  uhttps://library.ncl.res.in/content/enhanced-photocatalytic-activity-multi-doped-tio2-degradation-methyl-orange-0