title: Preparation of zwitterionic hybrid polymer and its application for the removal of heavy metal ions from water.
abstract: A series of zwitterionic hybrid polymers were prepared from the ring-opening polymerization of pyromellitic acid dianhydride (PMDA) and phenylaminomethyl trimethoxysilane (PAMTMS), and a subsequent sol-gel process. FTIR spectra confirmed the step products. TGA analysis showed that the thermal degradation temperature increased with an increase in PMDA content. As a typical example, sample B was used to separate Cu(2+) and Pb(2+) removal by adsorption. It was indicated that its adsorption for Cu(2+) and Pb(2+) followed Lagergren second-order kinetic model and Langmuir isotherm model, demonstrating that the adsorption process might be Langmuir monolayer adsorption. Meanwhile, it was found that the adsorption capacity of Pb(2+) on sample B is beyond 12 times higher than that of Cu(2+) in 0.1 mol dm(-3) aqueous solution, revealing that it has larger affinity for Pb(2+). The desorption efficiency of Cu(2+) and Pb(2+) in 1 mol dm(-3) HNO(3) solution reached up to 96 and 89%, respectively; indicating that they can be regenerated and recycled in industry. These findings suggest that they are promising adsorbents for the selective removal of Pb(2+) from Pb(2+)/Cu(2+) mixed aqueous solution, and can be applied to separate and recover the heavy metal ions from contaminated water and waste chemicals.
authors.affiliation: Key Laboratory of Membrane Materials & Processes, Department of Chemical and Materials Engineering, Hefei University, 373 Huangshan Road, Hefei 230022, China.
authors.forename: Junsheng
authors.initials: J
authors.lastname: Liu
authors.forename: Yue
authors.initials: Y
authors.lastname: Ma
authors.forename: Tongwen
authors.initials: T
authors.lastname: Xu
authors.forename: Guoquan
authors.initials: G
authors.lastname: Shao
mesh_terms: D000327:Adsorption; D000465:Algorithms; D000814:Aniline Compounds / Q000737:chemistry*; D001565:Benzoates / Q000737:chemistry*; D003300:Copper / Q000302:isolation & purification; D007202:Indicators and Reagents; D007474:Ion Exchange; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification; D019216:Metals, Heavy / Q000302:isolation & purification*; D009566:Nitrates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D012828:Silicones / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D018508:Water Purification / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D001565:Benzoates; D007202:Indicators and Reagents; D019216:Metals, Heavy; D009566:Nitrates; D011108:Polymers; D012821:Silanes; D012828:Silicones; C550718:phenylaminomethyl trimethoxysilane; D007854:Lead; C012019:pyromellitic dianhydride; D003300:Copper