![]() Complete decomposition of MO was achieved in less than 370 min using core-shell particles prepared from triple coating.Ībstract = "SiO2/TiO2 core-shell particles were prepared to decompose methyl orange (MO) in a laboratory scale study prior to its use in the treatment of waste containing azo dyes that might potentially pose adverse environmental consequences and health hazard to human. 30 nm was sustained or equivalently, 3 coatings were applied. Rutile phase started to develop at 5 coatings, suggesting that anatase crystallite size was attainable for as long as the critical crystalline size smaller than ca. The silica core crystals exhibited highly amorphous structures, whereas titania covered silica cores demonstrated pure anatase phase that grew in size upon heat treatment at 900 ☌. The isoelectric point of the core-shell particles was equivalent to that of pure titania (4.5) due to the complete encapsulation of silica cores by titania. When multi-step shell coating was applied to increase the shell thickness, loose titania shells were observed despite increasing surface coverage at higher number of coating step. The use of sonification improved the dispersion at the expense of thin shell. The preparation of silica cores produced perfectly spherical and smooth surfaces, but when TiO 2 shell/film was deposited using titanium butoxide (TBOT) precursor at concentration >0.24 mol L -1, the resulting shell was rougher and loose, giving rise to Ostwald ripening that caused the core-shell particles to agglomerate. SiO 2/TiO 2 core-shell particles were prepared to decompose methyl orange (MO) in a laboratory scale study prior to its use in the treatment of waste containing azo dyes that might potentially pose adverse environmental consequences and health hazard to human.
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