International Journal of Waste Resources

A study on the use of clay caking waste casting sand for mesoporous silica synthesis and antimony (Sb) adsorption performance

15^th World Congress and Expo on Recycling

October 16-17, 2023 | Vancouver, Canada

Park Soyee and Kim Su Hyang

Republic of Korea

Posters & Accepted Abstracts: Int J Waste Resour

Abstract:

Mesoporous silica, a type of adsorbent, is a porous material with mesopores (2 to 50 nm), has excellent adsorption capacity, and is being studied for the removal of various contaminants. However, the need for alternative materials to compensate for the toxicity and high cost of the precursor reagent used in the production, Tetraethyl orthosilicate (TEOS), is also discussed. Therefore, in this study, we tried to confirm the possibility of using clay coking waste molding sand, a kind of waste molding sand, as a precursor reagent as an alternative to TEOS. Clay caking waste casting sand is waste sand generated in foundries, and a large amount is discarded as waste every year, accounting for about 70% of the waste generated in the casting manufacturing industry. Recently, many methods have been applied to recycle waste molding sand as a resource, but the reuse rate is not relatively high because the treatment cost of recycled sand is higher than that of general sand, and there are problems with quality degradation in the recycling process. When SiO2 contained in waste molding sand combines with a hydroxyl group, it is determined that it can be replaced as a precursor reagent for mesoporous silica production by using the property that polarity occurs on the surface, and after preparing an adsorbent, an antimony(Sb) adsorption experiments were carried out to evaluate efficiency as an adsorbent.