Comprehensive Study of Mesoporous Aluminosilicate Glasses and Clay-like Layer Compound Somasif as Potential Materials for Dye Removal from Wastewater Effluents

Reference Presenter Authors
06-061 Carsten Doerenkamp Doerenkamp, C.(Universidade de São Paulo); Almeida, F.P.(Universidade de São Paulo); Costa, M.(Universidade de São Paulo); de Camargo, A.(Universidade de São Paulo); Eckert, H.(Universidade de São Paulo);
The textile industry is one of the most serious water polluters and still generates a large amount of wastewater contaminated with toxic and carcinogenic dye molecules. Apart from those hazardous properties, the untreated dyes also inhibit the penetration of sunlight into the water, so that photosynthesis by phytoplankton decreases, leading to decreased oxygen contents.
Due to their simple and inexpensive production, their large specific surface area, as well as their chemical and mechanical stability, porous solids offer a broad field of application involving the immobilization of functional molecules and active species for various materials science applications in optics, sensor technology and catalysis. The present contribution focuses on the effective ion exchange properties of clay-like layer compounds such as Somasif and mesoporous aluminosilicates, which makes them interesting for environmentally friendly wastewater decontamination.
Sol-gel methodology was used to synthesize mesoporous amorphous sodium-aluminosilicate host matrices of composition Si1-xAlxNaxO2, 0.1<x<0.33.[1] In comparison to the commercially available clay Somasif, we studied different parameters of the wastewater treatment, using aqueous solutions of Rhodamine 6G as wastewater models. The adsorption kinetics were found to be favorable over a wide pH working range and high sorption capacities suggest that these materials are potentially useful reagents for effective dye removal. Furthermore, we could show that these materials can be thermally recycled by pyrolyzing the adsorbed dye molecules. The structural integrity of the porous hosts was examined over several sorption and pyrolysis cycles using nitrogen sorption and solid-state NMR techniques.
C.D. acknowledges funding by FAPESP, grant number 2017/06649-0.
[1] F.P Almeida, M.B. Botelho, C. Doerenkamp, E. Kessler, C.R. Ferrari, H. Eckert, A.S.S. de Camargo, JSSC 253, 406-413 (2017)
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