1. Catalytic dechlorination of 2,4 -dichlorophenol by Ni/Fe nanoparticles in the presence of humic acid: intermediate products and some experimental parameters.
- Author
-
Zhang, Zhen, Lv, Xiaoshu, Baig, ShamsAli, and Xu, Xinhua
- Subjects
BIMETALLIC catalysts ,DECHLORINATION (Chemistry) ,DICHLOROPHENOLS ,HUMIC acid ,IRON-nickel alloys ,CHLOROPHENOLS - Abstract
The catalytic dechlorination of2,4-dichlorophenol (2,4-DCP) by Ni/Fe bimetallic nanoparticles in the presence of humic acid (HA) was investigated in order to understand their applicability forin situremediation of groundwater.2,4-DCP was catalytically dechlorinated to form the final products – phenol (P) via two intermediates,o-chlorophenol (o-CP) andp-chlorophenol (p-CP). It was demonstrated that the carbon mass balances during the dechlorination were between 84% and 92%, and other carbons were adsorbed on the surface of Ni/Fe bimetallic nanoparticles. The experimental results suggest that HA competed for reaction sites on the Ni/Fe bimetallic nanoparticles with2,4-DCP, and thus reduced the efficiency and rate of the dechlorination of2,4-DCP. The catalytic degradation slowed down as the increase of HA in solution, and when HA's concentrations were 0, 10, 20 and 30 mg L−1, the maximum concentrations ofo-CP were 0.025, 0.041, 0.039 and 0.034 mM in 10, 30, 30 and 30 min, respectively. High Ni content, low initial pH value, high Ni/Fe nanoparticles’ dosage and high temperature favoured the catalytic dechlorination of2,4-DCP. The experimental results show that no other intermediates were generated besides Cl−,o-CP,p-CP and P during the catalytic dechlorination of2,4-DCP. [ABSTRACT FROM PUBLISHER]
- Published
- 2014
- Full Text
- View/download PDF