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SUMMARY:Synthesis of TiO2-based Nanomaterials and their Application in Ars
 enic Removal from Drinking Water
DTSTART:20081119T141500
DTSTAMP:20260427T233126Z
UID:6f2b96db57abbeea013e5ba4bd3a9b64e2184cf5a0302e6c42fc4355
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Deedar Nabi\nPure TiO (108 nm) and iron-doped TiO\,Fe0.0063
 Ti0.9937O2\, (65 nm)\nnanoparticles synthesized via sol-gel process were u
 sed along with\nGeneral Purpose Reagent (GPR) TiO2 (325 nm) for studies of
  Arsenic\nremoval from drinking water. These nanopatricles were in 100 % a
 natase\ncrystalline phase. Energy dispersive elemental analysis indicated 
 better\npercentage purity of lab synthesized nanoparticles as compared to 
 GPR\nTiO. Yellow orange color of doped TiO22 showed a red shift in absorpt
 ion\nwavelength from 387.5 nm to around 435 nm\, thereby making the doped\
 nspecies visible light responsive. Pure TiO2 nanoparticles were\nsuccessfu
 lly immobilized by generating titania-coated sand (TCS) singly\n(TCS-1) an
 d doubly (TCS-2) via the sol-gel process.\nTo see the effects of different
  conditions on Arsenic adsorption\, five\nsystems were used\, viz.\, As(V)
  in Air-Light \, As(III) in Air-Light\,\nAir-Sunlight\, Air-Dark and Nitro
 gen-Dark conditions. Kinetics of\nadsorption followed pseudo-second order 
 rate law except for\nAs(III)-Air-Light system which followed Elovich model
 . Adsorption of\nArsenic on the adsorbents followed Freundlich and Langmui
 r model.\nIron-doped TiO showed higher affinity for Arsenic than pure TiO2
 2 which\nin turn showed greater affinity than GPR TiO2. Similarly\, TCS-2 
 showed\nhigher Arsenic affinity than TCS-1. Removal of As(III) was higher 
 in\nlight and oxidizing conditions than in dark and anoxic conditions.\n F
 rom pH dependence behavior\, Point of Zero Charge of the nanoadsorbents\nw
 as estimated to be around 7. Arsenic adsorption decreased with increase\ni
 n pH. In TCS column test\, 98% of As(V) and As(III) was removed with no\nl
 eaching of TiO up to 1500 and 1450 bed volumes\, respectively.
LOCATION:GR C1 564
STATUS:CONFIRMED
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