Removal of benzene and toluene by carbonized bamboo materials modified with TiO₂
2008
Chuang, Chih Shen | Wang, Ming-Kuang | Ko, Chun-Han | Ou, Chia-Chih | Wu, Chien-Hou
Carbonized moso bamboo (Phyllostachys pubescens) was coated with TiO₂ nanoparticles to enhance its removal efficiency of harmful gases. Carbonized bamboo-TiO₂ composite (CBC) was prepared by heating mixtures of carbonized bamboo powder (CB) and TiO₂ nanoparticles, denoted as CBM, under nitrogen condition. TiO₂ nanoparticle and carbonized bamboo powder were mixed with the mass ratios of 1/1 and 2/1, respectively. At the same mass ratio of TiO₂ to CB, the benzene and toluene removal efficiencies follow the trend: CBC>CBM>CB, which is consistent with the amount of TiO₂ validated by elemental analysis. Sorption mechanism of benzene and toluene by CB, CBM and CBC might belong to hydrophobic-hydrophobic interaction, observed by depletion of untreated bamboo (UB) carbohydrates during carbonization. Sorption kinetics was further analyzed, and optimal correlation was found by fitting with the Elovich kinetic equation.
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