title: [Degradation of highly-chlorinated benzenes by nanoscale iron and palladized iron in aqueous system].
abstract: Adsorption and degradation of three typical chlorinated benzenes (CBs) were evaluated using commercial nanoscale Fe (nFe) and synthesized palladized Fe (Pd/nFe) via batch experiments. The results showed that the adsorption capacity exhibited significant difference between various conditions, of which its maximum adsorption amount reached with Tris-buffered solution of pH = 6. 8. 1, 2, 4, 5-TeCB can be dechlorinated by Pd/nFe efficiently within 20 hours. The degradation rates were 75% and 92% in pure water system and Tris-buffered solution, respectively. However, nFe seemed to be inactive to 1, 2, 4, 5-TeCB with final degradation rate of about 25%. Meanwhile, Pd/nFe also only had slight degradation capacities to HCB and PeCB when compared to 1, 2, 4, 5-TeCB. 1, 2, 3, 4-TeCB, 1, 2, 3-TCB and 1, 2-DCB are the only products that were detected during the whole experiments, indicating that chlorine atoms of CBs with less steric effect were preferred to be dechlorinated. The degradation can be fitted by pseudo first order equations. The observed rate constants were ranged from 0. 14 4 h(-1) to 0.115 2 h(-1).
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences, Chinese Academy of Sciences, Nanjing 210008, China. jieli@issas.ac.cn
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Xing-Lun
authors.initials: XL
authors.lastname: Yang
authors.forename: Cheng-Gang
authors.initials: CG
authors.lastname: Gu
authors.forename: Yin-Ping
authors.initials: YP
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Jiang
mesh_terms: D000327:Adsorption; D002722:Chlorobenzenes / Q000737:chemistry / Q000302:isolation & purification*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D002722:Chlorobenzenes; D014874:Water Pollutants, Chemical; D010165:Palladium; D007501:Iron