Sorption capacity and mechanism of Cr3+ on TOBERMORITE (cas 1319-31-9) derived from fly ash acid residue and carbide slag

Add time:08/20/2019    Source:sciencedirect.com

In this study, TOBERMORITE (cas 1319-31-9) was successfully synthesized from two kinds of industrial wastes by single step hydrothermal method. The structural and morphological changes during synthesis show that well-crystallized tobermorite can be obtained within 6 h at 180 °C in this system. The carbon impurities lead to a longer synthesis time and lower crystallinity of tobermorite. The tobermorite displays attractive adsorption capacity for Cr3+ (4.87 mmol/g), which is 2–3 times higher than common clay minerals. Meanwhile, Cr3+ adsorption causes the exsolution of structural Ca2+ in tobermorite channels, leading to the damage of crystallinity and decrease in sorption capacity of adsorbent. Therefore, better crystallization of tobermorite is helpful to achieve higher sorption capacity for Cr3+. These results indicate tobermorite can be used in industrial processes to adsorb heavy metals from wastewater.

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