Fly ash-based geopolymer as a novel photocatalyst for degradation of dye from wastewater  

作　　者：Yaojun Zhang Licai Liu 

机构地区：[1]School of Materials and Mineral Resources,Xi'an University of Architecture and Technology

出　　处：《Particuology》2013年第3期353-358,共6页颗粒学报（英文版）

基　　金：financially supported by Industrial Key Project of Shaanxi Province(No.2010K01-080);Open Fund of State Key Laboratory of Architecture Science and Technology in West China(XAUAT);Xi'an University of Architecture and Technology(No.10KF05);Scientific Research Program Funded by Shaanxi Provincial Education Department(No.12JK0579)

摘　　要：The geopolymer synthesized by alkali-activated fly ash was firstly used as a novel photocatalyst for degradation of methylene blue （MB） dye from wastewater. The geopolymer is composed of nanoparticulates with an average particle size of about 50 nm, More than 90% of pore volume in the fly ash-based geopolymet predominately centralized on the pore size in the range of 17-700 nm. The degradation efficiency of MB dye by fly ash-based geopolymer catalyst was up to 92.79% under UV irradiation due to the synergistic effect of adsorption and semiconductor photocatalysis. The pseudo-first-order and pseudo-second-order rate equations as well as intra-particle diffusion rate equation were employed to correlate analysis for the adsorption kinetics of MB dye, The experimental data agreed well with pseudo-second-order rate equation in both cases of with UV and without UV irradiations. The intra-particle diffusion process is not the rate determining step. The photocatalytic degradation of MB dye in solution obeys third-order reaction kinetics.The geopolymer synthesized by alkali-activated fly ash was firstly used as a novel photocatalyst for degradation of methylene blue （MB） dye from wastewater. The geopolymer is composed of nanoparticulates with an average particle size of about 50 nm, More than 90% of pore volume in the fly ash-based geopolymet predominately centralized on the pore size in the range of 17-700 nm. The degradation efficiency of MB dye by fly ash-based geopolymer catalyst was up to 92.79% under UV irradiation due to the synergistic effect of adsorption and semiconductor photocatalysis. The pseudo-first-order and pseudo-second-order rate equations as well as intra-particle diffusion rate equation were employed to correlate analysis for the adsorption kinetics of MB dye, The experimental data agreed well with pseudo-second-order rate equation in both cases of with UV and without UV irradiations. The intra-particle diffusion process is not the rate determining step. The photocatalytic degradation of MB dye in solution obeys third-order reaction kinetics.

关 键 词：Fly ash-based geopolymer Photocatalysis Adsorption kinetics Degradation efficiency Reaction kinetics 

分 类 号：X703[环境科学与工程—环境工程]