Journal
APPLIED CLAY SCIENCE
Volume 182, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.clay.2019.105276
Keywords
Pillared montmorillonite; Cobalt impregnation; Oxone (R); Advanced oxidation process; Dye degradation
Funding
- Ministry of Education, Science and Technological Development of the Republic of Serbia [III 45001, ON 176006]
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Aluminum pillared clay was synthesized and impregnated with Co2+ (CoAP), using incipient wetness impregnation method. The obtained CoAP was characterized by chemical analysis, XRPD, SEM with EDS, XPS and low temperature N-2 physisorption. By these methods the incorporation of Co2+ was confirmed in both micro and mesoporous region. The synthesized material was investigated as a catalyst in catalytic oxidation of organic water pollutants - dyes - in the presence of Oxone (R) (peroxymonosulfate). Oxone (R) is a precursor of sulfate radicals. Tartrazine was chosen as a model dye pollutant. The influence of the mass of the catalyst, temperature and initial pH was investigated. Temperature increase was beneficial for dye degradation rate. The reaction rate was the highest for initial pH values around those corresponding to neutral conditions, somewhat slower for pH < 4 values, while for pH > 10 decolorization was significantly less expressed. Along with decolorization of tartrazine solution the formation and degradation of tartrazine catalytic oxidation products were monitored using UV-Vis spectroscopy. CoAP was found to be efficient catalyst in Oxone (R) induced catalytic degradation of both tartrazine and detected products of its degradation.
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