title: In situ generation of silver nanoparticles within crosslinked 3D guar gum networks for catalytic reduction.
abstract: The direct use of guar gum (GG) as a green reducing agent for the facile production of highly stable silver nanoparticles (Ag NPs) within this biopolymer and subsequent crosslinking with borax to form crosslinked Ag@GG beads with a 3D-structured network are presented here. These crosslinked Ag@GG beads were characterized using UV-vis absorption spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy, and then tested as a solid-phase heterogenerous catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of excess borohydride. The results indicate that these crosslinked Ag@GG beads show excellent catalytic performance for the reduction of 4-NP within 20 min and can be readily used for 10 successive cycles.
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
authors.forename: Yian
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Guangyan
authors.initials: G
authors.lastname: Tian
authors.affiliation: Center of Eco-materials and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China. Electronic address: aqwang@licp.cas.cn.
authors.forename: Aiqin
authors.initials: A
authors.lastname: Wang
mesh_terms: D002384:Catalysis; D005685:Galactans / Q000737:chemistry*; D008351:Mannans / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D053149:Plant Gums / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D012834:Silver; C007894:guar gum
keywords: 4-Nitrophenol; Biopolymer; Green reduction; Guar gum; Silver nanoparticles