title: Preparation and adsorption property of xylan/poly(acrylic acid) magnetic nanocomposite hydrogel adsorbent.
abstract: Adsorbents based on natural polysaccharides have attracted increasing interest because of their low-cost and biodegradability, particularly, polysaccharide-based nanocomposite adsorbents. In this study the xylan/poly(acrylic acid) magnetic nanocomposite hydrogel adsorbent was prepared from wheat straw xylan and Fe3O4 nanoparticles, and its adsorption property was studied on methylene blue removal. The prepared hydrogel adsorbent had a semi-interpenetrating network structure and exhibited a macro-porous structure with interconnected porous channels. Super-paramagnetic characteristic behavior was observed from magnetic analysis using a vibrating sample magnetometer. The optimum condition for methylene blue adsorption on the adsorbent was found at pH 8 with an adsorbent dosage of 3g/L and an initial concentration of 400mg/L, and the removal percentage reached above 90%. The adsorption isotherm of methylene blue on the prepared hydrogel adsorbent was fitted to the Langmuir model, and the pseudo-second-order kinetic model could describe the adsorption process. All obtained results indicated that the prepared hydrogel adsorbent is promising for water treatment applications.
authors.affiliation: MOE Key Lab of Applied Physics and Chemistry in Space, Department of Chemistry, College of Science, Northwestern Polytechnic University, Xi'an 710072, China. Electronic address: xf001sn@nwpu.edu.cn.
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Sun
authors.affiliation: MOE Key Lab of Applied Physics and Chemistry in Space, Department of Chemistry, College of Science, Northwestern Polytechnic University, Xi'an 710072, China.
authors.forename: Baichen
authors.initials: B
authors.lastname: Liu
authors.affiliation: MOE Key Lab of Applied Physics and Chemistry in Space, Department of Chemistry, College of Science, Northwestern Polytechnic University, Xi'an 710072, China.
authors.forename: Zhanxin
authors.initials: Z
authors.lastname: Jing
authors.affiliation: MOE Key Lab of Applied Physics and Chemistry in Space, Department of Chemistry, College of Science, Northwestern Polytechnic University, Xi'an 710072, China.
authors.forename: Haihong
authors.initials: H
authors.lastname: Wang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D008280:Magnetics; D008751:Methylene Blue / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000379:methods; D014990:Xylans / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D014874:Water Pollutants, Chemical; D014990:Xylans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; C006903:carbopol 940; D008751:Methylene Blue
keywords: Adsorbent; Fe(3)O(4) nanoparticles; Methylene blue; Xylan