title: Reduction and immobilization of chromium(VI) by nano-scale Fe0 particles supported on reproducible PAA/PVDF membrane.
abstract: A new class of nano-scale Fe0 particles (NZVI) supported on a PAA/PVDF membrane (NZVI-PAA/PVDF) were synthesized and the feasibility of using NZVI-PAA/PVDF for reductive immobilization of Cr(VI) in water was investigated through laboratory batch tests. The results showed that the Cr(VI) removal capacity of NZVI-PAA/PVDF was 181 mg Cr/g Fe at an initial Cr(VI) concentration of 20 mg L(-1) under pH 6.5 +/- 0.1. XPS results showed that Cr(VI) was converted to nontoxic Cr(III). Interfering ions exerted various degrees of impact on NZVI-PAA/PVDF's Cr(VI) removal capacity. Specifically, Ca2+ alone showed the mildest impact while the presence of ions (Mg2+ and HCO3-) exerted the greatest impact. An advantage of NZVI-PAA/PVDF is that the nano-scale Fe0 and resultant particles were combined within a PAA/PVDF membrane, which prevents secondary pollution. Moreover, a piece of PAA/PVDF membrane (4.7 cm diameter) can still support 6.51 mg of nano-scale Fe0 particles after being renewed.
authors.affiliation: College of Environmental Science and Engineering, Nankai University, Tianjin, PR China.
authors.forename: Shujing
authors.initials: S
authors.lastname: Li
authors.forename: Tielong
authors.initials: T
authors.lastname: Li
authors.forename: Zongming
authors.initials: Z
authors.lastname: Xiu
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Jin
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D002857:Chromium / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D011145:Polyvinyls / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D005465:Fluorocarbon Polymers
chemical_list: D000180:Acrylic Resins; D002857:Chromium; D007501:Iron; D011145:Polyvinyls; D014874:Water Pollutants, Chemical; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers; C006903:carbopol 940