Visible-light assisted methylene blue (MB) removal by novel TiO2/adsorbent nanocomposites

摘要

In present work, visible light sensitive TiO2/adsorbent nanocomposites (TNC) were prepared viana facile wet chemical method. Three types of adsorbents including zeolites (F-9, HSZ-690 andnHSZ-930), mesoporous silica (MPS-2.7 and 4) and activated carbon, were used as the porousnsubstrates for nanocomposites. Visible light sensitivity was incorporated to TNCs by nitrogenndoping of TiO2, which is obtained through the addition of a nitrogen precursor, triethylamine,nwithin the same wet chemical procedure. The photocatalytic and adsorption ability of as-nprepared TNC resultants were studied using solutions of methylene blue (MB) as a modelnpollutant. Synergistic interactions between adsorption and visible-light photocatalysis werenobserved, as under the assistance of visible-light irradiation all TNCs achieved higher MBnremoval rates than those by adsorption process alone. The better performance of thenas-prepared N-doped TNC reveals its potential to be used for cost effective solar photocatalyticndegradation of dissolved organic compounds.