title: Chitosan based polymer matrix with silver nanoparticles decorated multiwalled carbon nanotubes for catalytic reduction of 4-nitrophenol.
abstract: A novel catalyst for the reduction of 4-nitrophenol (4-NP) was prepared using carboxyl group-functionalized multiwalled carbon nanotubes (MWCNTs), polymer matrix, and silver nanoparticles (AgNPs). The AgNPs were prepared by the reduction of silver nitrate by trisodium citrate in the MWCNTs-polymer nanocomposite; the size of the synthesized AgNPs was found to be 3nm (average diameter). The synthesized nanocomposites were characterized using several analytical techniques. Ag@MWCNTs-polymer composite in the presence of sodium borohydride (NaBH4) in aqueous solution is an effective catalyst for the reduction of 4-NP. The apparent kinetics of reduction has a pseudo-first-order kinetics, and the rate constant and catalytic activity parameter were found to be respectively 7.88×10(-3)s(-1)and 11.64s(-1)g(-1). The MWCNTs-polymer nanocomposite renders stability to AgNPs against the environment and the reaction medium, which means that the Ag@MWCNTs-polymer composite can be re-used for many catalytic cycles.
authors.affiliation: Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia. Electronic address: alshehri@ksu.edu.sa.
authors.forename: Saad M
authors.initials: SM
authors.lastname: Alshehri
authors.affiliation: Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia. Electronic address: trooke-99@hotmail.com.
authors.forename: Turki
authors.initials: T
authors.lastname: Almuqati
authors.affiliation: National Center for Petrochemicals Technology, KACST, Riyadh, Saudi Arabia. Electronic address: nalmuqati@kacst.edu.sa.
authors.forename: Naif
authors.initials: N
authors.lastname: Almuqati
authors.affiliation: Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia. Electronic address: eidalenazi@ksu.edu.sa.
authors.forename: Eida
authors.initials: E
authors.lastname: Al-Farraj
authors.affiliation: Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia. Electronic address: nhokbany@ksu.edu.sa.
authors.forename: Norah
authors.initials: N
authors.lastname: Alhokbany
authors.affiliation: Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia. Electronic address: tahamed@ksu.edu.sa.
authors.forename: Tansir
authors.initials: T
authors.lastname: Ahamad
mesh_terms: D002384:Catalysis; D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D005976:Glutaral / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D037742:Nanotubes, Carbon; D009596:Nitrophenols; D012834:Silver; D048271:Chitosan; D005976:Glutaral; C024836:4-nitrophenol
keywords: Catalyst; Chitosan; Multiwalled carbon nanotube; Reduction of 4-nitrophenol; Silver nanoparticle