Influence of Calcination Temperature on Structure and Adsorption and Photocatalytic Activity of Titanium Oxide Pillared Bentonite

Abstract

Abstract: TiO₂-pillared bentonite(Ti-Na-MMT) was synthesized via acid-catalyzed sol method and the influence of calcination temperature on the structure of Ti-Na-MMT and the removal of azo dye in aqueous solution were analyzed with XRD, FTIR, TG-DTA, BET and DRS. The results show that all the prepared materials were found thermally stable up to 773 K. The d₀₀₁ basal spacings of Ti-Na-MMT decreased with the increase of the calcination temperature. BET special surface area, median pore diameter, maximum pore volume and the size of titanium of Ti-Na-MMT were related to calcination temperature. BET specific surface area and maximun pore volume of Ti-Na-MMT calcinated at 473 K were the biggest, while median pore diameter and the size of titanium was the smallest. With the increase of calcination temperature, BET surface area and maximun pore volume decreased, while median pore diameter and the size of titanium increased. DRS result shows that Ti-Na-MMT calcinated at 473 K have the strongest absorbency. The regularity of the influence of the calcanating temperature on obsorbtive ability of Ti-Na-MMT was similar with photocatalytic activity, which indicates a synergistic effect on the process of adsorption and photocatalysis. Ti-Na-MMT calcinated at 473 K exhibits the highest adsorptive and photocatalytic activity.

Key words: TiO₂-pillared bentonite, Calcination temperature, Pore structure, Adsorptive and photocatalytic activity

CLC Number:

O643.36

TrendMD:

CHEN Jie, LIU Yan, HUANG Lei, FENG Wei*, XIONG De-Qi. Influence of Calcination Temperature on Structure and Adsorption and Photocatalytic Activity of Titanium Oxide Pillared Bentonite[J]. Chem. J. Chinese Universities, doi: .

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Influence of Calcination Temperature on Structure and Adsorption and Photocatalytic Activity of Titanium Oxide Pillared Bentonite

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