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| - Surface Modification of TiO2Nanoparticles For PhotochemicalReduction of Nitrobenzene
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| - The effects of surface modification of nanocrystallinetitanium dioxide (TiO2) with specific chelating agents onphotocatalytic degradation of nitrobenzene (NB) wasinvestigated in order to design a selective and effectivecatalyst for removal of nitroaromatic compounds fromcontaminated waste streams. Mechanisms of NB adsorptionand photodecomposition were investigated using infraredabsorption and electron paramagnetic resonancespectroscopy. Liquid chromatography and gas chromatography/mass spectrometry were used for byproductanalyses. Arginine, lauryl sulfate, and salicylic acid werefound to bind to TiO2 via their oxygen-containing functionalgroups. Modification of the TiO2 surface with arginineresulted in enhanced NB adsorption and photodecomposition,and compared to unmodified TiO2. The initial quantumyield for photodegradation of NB in this system was foundto be Φinit = 0.31 as compared to the one obtained forDegussa P25 of Φinit = 0.18. NB degradation followed areductive pathway over arginine-modified TiO2 andwas enhanced upon addition of methanol. No degradationof arginine was detected under the experimentalconditions. Arginine improved the coupling between NBand TiO2 and facilitated the transfer of photogeneratedelectrons from the TiO2 conduction band to the adsorbedNB. These results indicate that surface modification ofnanocrystalline TiO2 with electron-donating chelating agentsis an effective route to enhance photodecomposition ofnitroaromatic compounds.
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