PMID- 20698263
OWN - NLM
STAT- MEDLINE
DCOM- 20110425
LR  - 20161018
IS  - 0250-3301 (Print)
IS  - 0250-3301 (Linking)
VI  - 31
IP  - 6
DP  - 2010 Jun
TI  - [Dechlorination degradation of 2,4-D by nanoscale Fe3O4].
PG  - 1499-505
AB  - Reductive transformation of 2,4-Dichlorophenoxyacetic acid (2,4-D) by nanoscale 
      Fe3O4 was studied, and the effects of 2,4-D initial concentration, the dosage of 
      nanoscale Fe3O4, pH and temperature on degradation rate of 2,4-D were 
      investigated. The results showed that 48% 2,4-D with initial concentration of 10 
      mg/L was transformed within 48 h in the presence of 300 mg/L nanoscale Fe3O4. The 
      degradation of 2,4-D was a reductive dechlorination process, and the 
      concentration of chloride ion increased sharply with the degration of the 2,4-D. 
      Disappearance of parent species and formation of reaction intermediates and 
      products were analyzed by LC/MS. The transformation of 2,4-D followed a primary 
      pathway of its complete reduction to phenol and a secondary pathway of sequential 
      reductive hydrogenolysis to 2,4-dichlorophenol (2,4-DCP), 4-chlorophenol (4-CP) 
      or 2-chlorophenol (2-CP) and phenol. The degradation equations of 2,4-D by 
      nanoscale Fe3O4 conformed to pseudo-first-order kinetics, and the reaction rate 
      constant (K) of 4-CP, 2,4-DCP and phenol were 0.0043 h(-1), 0.0026 h(-1) and 
      0.0032 h(-1), respectively. The degradation rate increased with an increase in 
      initial concentration of 2,4-D from 0 mg/L to 10 mg/L, and increasing the dosage 
      of nanoscale Fe3O4 from 0 mg/L to 300 mg/L. The pH of reaction solution 
      significantly influenced reductive degradation of 2,4-D, and the optimum pH value 
      was 3.0. Besides, high temperature could improve dechlorination rate of 2,4-D.
FAU - Fang, Guo-Dong
AU  - Fang GD
AD  - School of Resources and Environment, Anhui Agricultural University, Hefei 230036, 
      China. fangguodong1983@yahoo.cn
FAU - Si, You-Bin
AU  - Si YB
LA  - chi
PT  - English Abstract
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - China
TA  - Huan Jing Ke Xue
JT  - Huan jing ke xue= Huanjing kexue
JID - 8405344
RN  - 0 (Herbicides)
RN  - 0 (Water Pollutants, Chemical)
RN  - 2577AQ9262 (2,4-Dichlorophenoxyacetic Acid)
RN  - XM0M87F357 (Ferrosoferric Oxide)
SB  - IM
MH  - 2,4-Dichlorophenoxyacetic Acid/chemistry/*isolation & purification
MH  - Ferrosoferric Oxide/*chemistry
MH  - Herbicides/chemistry/isolation & purification
MH  - Metal Nanoparticles/*chemistry
MH  - Oxidation-Reduction
MH  - Water Pollutants, Chemical/chemistry/*isolation & purification
MH  - Water Purification/*methods
EDAT- 2010/08/12 06:00
MHDA- 2011/04/26 06:00
CRDT- 2010/08/12 06:00
PHST- 2010/08/12 06:00 [entrez]
PHST- 2010/08/12 06:00 [pubmed]
PHST- 2011/04/26 06:00 [medline]
PST - ppublish
SO  - Huan Jing Ke Xue. 2010 Jun;31(6):1499-505.