Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation of organic montmorillonite supported TiO2 and its application in methylene blue removal
Highlights The basal spacing of Mt was 4.35 nm by using 1.5 STAB. TiO2 loading was increased from 10.2% in Mt/TiO2 to 46.7% in OMt/TiO2. Replacing Mt by OMt, the pore volume of TiO2 was enhanced by 69%. Band gap and hole-electron pairs recombination of TiO2 were reduced by OMt.
Abstract High agglomeration and low adsorption limited the photocatalytic efficiency of TiO2. Hereupon, organic montmorillonite (OMt) was used as the support to load TiO2, with a view to achieve the homogeneous dispersion of nanoparticles and obtain the photocatalyst with mesoporous structure. In the present study, three kinds of expanding agents were used to prepare OMt, and then OMt/TiO2 was produced by the process of diffusion, hydrolysis, and calcination. The microscopic properties were researched and the removal capability for methylene blue (MB) under simulated UV was discussed. Results showed that with the use of expanding agents, the basal spacing of montmorillonite (Mt) was enlarged significantly, and the biggest value was up to 4.35 nm. The optimal photoactivity of OMt/TiO2 was observed after calcinating at 600 °C, which was much higher than that of Mt/TiO2 and single TiO2. On the one hand, in comparison with Mt/TiO2, TiO2 content in OMt/TiO2 was increased by more than 358%, and the increase ratio for pore volume was 69%. On the other hand, in comparison with single TiO2, the mesoporous structure of OMt/TiO2 improved the adsorption capacity for MB. Moreover, the surface of charge separation efficiency of TiO2 was promoted by the presence of OMt, accelerating the photocatalytic removal of MB. Hence, the combination of OMt and TiO2 could efficiently enhance photoactivity.
Preparation of organic montmorillonite supported TiO2 and its application in methylene blue removal
Highlights The basal spacing of Mt was 4.35 nm by using 1.5 STAB. TiO2 loading was increased from 10.2% in Mt/TiO2 to 46.7% in OMt/TiO2. Replacing Mt by OMt, the pore volume of TiO2 was enhanced by 69%. Band gap and hole-electron pairs recombination of TiO2 were reduced by OMt.
Abstract High agglomeration and low adsorption limited the photocatalytic efficiency of TiO2. Hereupon, organic montmorillonite (OMt) was used as the support to load TiO2, with a view to achieve the homogeneous dispersion of nanoparticles and obtain the photocatalyst with mesoporous structure. In the present study, three kinds of expanding agents were used to prepare OMt, and then OMt/TiO2 was produced by the process of diffusion, hydrolysis, and calcination. The microscopic properties were researched and the removal capability for methylene blue (MB) under simulated UV was discussed. Results showed that with the use of expanding agents, the basal spacing of montmorillonite (Mt) was enlarged significantly, and the biggest value was up to 4.35 nm. The optimal photoactivity of OMt/TiO2 was observed after calcinating at 600 °C, which was much higher than that of Mt/TiO2 and single TiO2. On the one hand, in comparison with Mt/TiO2, TiO2 content in OMt/TiO2 was increased by more than 358%, and the increase ratio for pore volume was 69%. On the other hand, in comparison with single TiO2, the mesoporous structure of OMt/TiO2 improved the adsorption capacity for MB. Moreover, the surface of charge separation efficiency of TiO2 was promoted by the presence of OMt, accelerating the photocatalytic removal of MB. Hence, the combination of OMt and TiO2 could efficiently enhance photoactivity.
Preparation of organic montmorillonite supported TiO2 and its application in methylene blue removal
Zhang, Junjie (Autor:in) / Tan, Hongbo (Autor:in) / Deng, Xiufeng (Autor:in) / Li, Maogao (Autor:in) / Jian, Shouwei (Autor:in) / Li, Guangyan (Autor:in)
03.05.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Removal of methylene blue from water with montmorillonite nanosheets/chitosan hydrogels as adsorbent
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