Photodegradation of Methylene Blue and Crystal Violet by Zr-Modified Engelhard Titanium Silicate 10

被引:1
作者
Lazarova, Hristina [1 ]
Rusew, Rusi [1 ]
Iliev, Kostadin [1 ]
Tsvetanova, Liliya [1 ]
Barbov, Borislav [1 ]
Shivachev, Boris [1 ]
机构
[1] Bulgarian Acad Sci, Inst Mineral & Crystallog Acad Ivan Kostov, Sofia 1113, Bulgaria
关键词
photodegradation; Na-K-ETS-10; crystal violet; methylene blue; PHOTOCATALYTIC DEGRADATION; ADSORPTION; REMOVAL; ETS-10; TIO2; CATALYSTS; EQUATION; NITROGEN; SYSTEMS; AREA;
D O I
10.3390/w15234186
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The present work focuses on the removal of dyes from polluted water, and, more precisely, the targets are crystal violet (CV) and methylene blue (MB). For this purpose, a series of Zr-modified catalysts based on microporous Engelhard Titanium Silicate 10 (ETS-10) were developed and synthesized. Aiming at improvement in the photodegradation efficiency and stability of ETS-10, Zr centers replacing part of Ti ones were introduced during the synthesis procedure. The obtained Na-K-ETS-10/xZr catalysts were characterized by X-ray powder diffraction (XRD), wavelength dispersive X-ray fluorescence (WDXRF), N2 physisorption and Fourier transform infrared spectroscopy (FTIR). The photocatalytic properties of Na-K-ETS-10/xZr- (x = 5, 10, 15 and 20 wt% Zr) catalysts were studied in terms of water purification from crystal violet and methylene blue. The Na-K-ETS-10/xZr wt% x = 6 catalyst appeared to be the most efficient in the photodegradation of CV and MB, removing nearly 100% of the dyes. Kinetic studies showed that the removal of CV and MB is a rapid process and one, which obeys the non-linear pseudo-second-order model.
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页数:18
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