Nano-pyrite as a Reductant to Remove Chromium in Groundwater

• Published in: KSCE Journal of Civil Engineering
• Main Author: Abdul N.A.; Abdul-Talib S.; Amir A.
• Format: Article
• Language: English
• Published: Springer Verlag 2019
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059152615&doi=10.1007%2fs12205-019-1034-x&partnerID=40&md5=a3c0f70c4318364c7df1ffbf0dd25cee

Removal of total chromium (Cr T ) by nano-pyrite (nano-FeS 2 ) was investigated under different environmental conditions. Size of nano-FeS 2 was in the range of 50−100 nm and it contained Fe and S. Removal kinetic rate constant of Cr T was significantly dependent on the suspension pH and concentrations of Cr T , nano-FeS 2 and Humic Acid (HA). The removal kinetic rate constant of Cr T by nano-FeS 2 was decreased as the concentration of Cr T was increased (0.43−0.29 min −1 ), while contradict kinetic result was observed as the concentration of nano-FeS 2 was increased (1.11−2.78 min −1 ). The removal kinetic rate constant of Cr T was significantly increased as the suspension pH increased (0.86−3.0 min −1 ). However, the removal kinetic rate constant of Cr T was significant decreased in the present of HA (1.25−0.25 min−1). The removal kinetic rate constant of Cr T by nano-FeS 2 was strongly controlled by the reactive surface area of nano-FeS 2 . Identification of the formation of FeCr 2 O 4 on the surface of nano-FeS 2 reveals that adsorption, complexation and reduction reactions may occur during the removal reaction. This study provides fundamental knowledge on the fate of Cr under different groundwater conditions. Findings from this study can be used to enhance remediation technology of removal heavy metals from groundwater. © 2019, Korean Society of Civil Engineers.