Bimetallic iron-aluminum particles for dechlorination of carbon tetrachloride.
Bimetallic iron-aluminum (Fe/Al) particles were synthesized and tested for their reactivity toward carbon tetrachloride using batch reactors and a flow-through column at near neutral pH. Preparation of bimetallic Fe/Al particles was conducted under acidic conditions under which iron was readily deposited onto the aluminum surface. The SEM image showed clusters of iron on the aluminum surface at the measured Fe:Al molar ratio of about 2:3. Results showed that the presence of zero-valent aluminum successfully prevented the formation of a passive layer at the iron surface and maintained the reactivity of iron. The dechlorination of carbon tetrachloride by bimetallic Fe/Al particles produced chloroform (9%), dichloromethane (17%) and methane (38%). Kinetic analysis suggests that bimetallic Fe/Al particles increased the reactivity toward carbon tetrachloride degradation by a factor of 10 compared to zero-valent iron and possessed a comparable reactivity with nano-sized Fe. The effectiveness of bimetallic Fe/Al particles was further confirmed by the continuous flow column study from which an ageing of bimetallic particles was also observed.
Chen
Li-Hua
LH
Department of Civil and Environmental Engineering, National University of Kaohsiung, 700 Kaohsiung University Road, Kaohsiung 811, Taiwan.
Huang
Chang-Chieh
CC
Lien
Hsing-Lung
HL
D000535:Aluminum / Q000737:chemistry*; D002251:Carbon Tetrachloride / Q000737:chemistry* / Q000302:isolation & purification; D004787:Environmental Pollution / Q000517:prevention & control; D052918:Environmental Restoration and Remediation / Q000379:methods; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
D014874:Water Pollutants, Chemical; D002251:Carbon Tetrachloride; D000535:Aluminum; D007501:Iron