title: Poly[beta-(1-->4)-2-amino-2-deoxy-D-glucopyranose] based zero valent nickel nanocomposite for efficient reduction of nitrate in water.
abstract: Chemical reduction of nitrate using metal nanoparticles has received increasing interest due to over-dependence on groundwater and consequence health hazard of the nitrate ion. One major drawback of this technique is the agglomeration of nanoparticles leading to the formation of large flocs. A low cost biopolymeric material, poly [beta-(1-->4)-2-amino-2-deoxy-D-glucopyranose] (beta-PADG) obtained from deacetylated chitin was used as stabilizer to synthesize zero valent nickel (ZVNi) nanoparticles. The beta-PADG-ZVNi nanocomposite was characterized using infra red (IR), UV-Vis spectrophotometric techniques and Scanning Electron Microscope (SEM). The morphology of the composite showed that beta-PADG stabilized-ZVNi nanoparticles were present as discrete particles. The mean particle size was estimated to be (7.76 +/- 2.98) nm and surface area of 87.10 m2/g. The stabilized-ZVNi nanoparticles exhibited markedly greater reactivity for reduction of nitrate in water with 100% conversion within-2 hr contact owing to less agglomeration. Varying the beta-PADG-to-ZVNi ratio and the ZVNi-to-nitrate molar ratio generally led to a faster nitrate reduction. About 3.4-fold difference in the specific reaction rate constant suggests that the application of the beta-PADG-stabilizer not only increased the specific surface area of the resultant nanoparticles, but also greatly enhanced the surface reactivity of the nanoparticles per unit area.
authors.affiliation: Department of Chemistry College of Natural Science, University ofAgriculture Abeokuta, PMB 2240 Abeokuta, Ogun, 100001, Nigeria. adewuyis@unaab.edu.ng
authors.forename: Sheriff
authors.initials: S
authors.lastname: Adewuyi
authors.forename: Nurudeen O
authors.initials: NO
authors.lastname: Sanyaolu
authors.forename: Saliu A
authors.initials: SA
authors.lastname: Amolegbe
authors.forename: Abdulahi O
authors.initials: AO
authors.lastname: Sobola
authors.forename: Olujinmi M
authors.initials: OM
authors.lastname: Folarin
mesh_terms: D005947:Glucose / Q000031:analogs & derivatives* / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles; D009532:Nickel / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D009566:Nitrates; D014874:Water Pollutants, Chemical; D009532:Nickel; D005947:Glucose