title: Synthesis of poly(aminopropyl/methyl)silsesquioxane particles as effective Cu(II) and Pb(II) adsorbents.
abstract: Poly(aminopropyl/methyl)silsesquioxane (PAMSQ) particles have been synthesized by a one-step hydrolytic co-condensation process using 3-aminopropyltriethoxysilane (APTES) and methyltrimethoxysilane (MTMS) as precursors in the presence of base catalyst in aqueous medium. The amino functionalities of the particles could be controlled by adjusting the organosilanes feed ratio. The compositions of the amino-functionalized polysilsesquioxanes were confirmed by FT-IR spectroscopy, solid-state (29)Si NMR spectroscopy, and elemental analysis. The strong adsorbability of Cu(II) and Pb(II) ions onto PAMSQ particles was systematically examined. The effect of adsorption time, initial metal ions concentration and pH of solutions was studied to optimize the metal ions adsorbability of PAMSQ particles. The kinetic studies indicated that the adsorption process well fits the pseudo-second-order kinetics. Adsorption phenomena appeared to follow Langmuir isotherm. The PAMSQ particles demonstrate the highest Cu(II) and Pb(II) adsorption capacity of 2.29 mmol/g and 1.31 mmol/g at an initial metal ions concentration of 20mM, respectively. The PAMSQ particles demonstrate a promising application in the removal of Cu(II) and Pb(II) ions from aqueous solutions.
authors.affiliation: State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, P.O. Box 545, Meilong Road 130, Shanghai 200237, People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Lu
authors.forename: Qiangfeng
authors.initials: Q
authors.lastname: Yin
authors.forename: Zhong
authors.initials: Z
authors.lastname: Xin
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.forename: Ting
authors.initials: T
authors.lastname: Han
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry / Q000302:isolation & purification*; D004785:Environmental Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D007700:Kinetics; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D017646:Organosilicon Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011437:Propylamines / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D004785:Environmental Pollutants; D017646:Organosilicon Compounds; D011437:Propylamines; D012821:Silanes; D012996:Solutions; C569780:polysilsesquioxane; C071718:methyltrimethoxysilane; D007854:Lead; D003300:Copper