title: Guanidylated hollow fiber membranes based on brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) for gold sorption from acid solutions.
abstract: Novel guanidylated hollow fiber membranes are prepared based on brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) under mild reaction conditions. 1H-pyrazole-1-carboxamidine hydrochloride (HPCA) is employed for the guanidylation in aqueous solution at room temperature. The obtained guanidylated PPO hollow fiber membranes (GPPO HFMs) contain 0.31-0.95 mmol/g guanidyl groups and show high affinity to tetrachloroauric anions (AuCl(4)(-)) in acid solutions. For 0.1M HCl solution containing 57.8 mg gold/L, the sorption amount can get as high as 130 mg/g. Besides, the GPPO HFMs show preferable selectivity toward gold in multicomponent solution containing Mg(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Pb(II). A system of comparison experiments involving the sorption behavior of GPPO HFMs and quaternary aminated HFMs are also performed. The results reveal that driving forces for the high adsorption of gold mainly involve complexation mechanism. Overall, the obtained GPPO HFM is a promising chelating material for the recovery of gold.
authors.affiliation: CAS Key Laboratory of Soft Matter Chemistry, Lab of Functional Membranes, School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, PR China.
authors.forename: Jin
authors.initials: J
authors.lastname: Ran
authors.forename: Na
authors.initials: N
authors.lastname: Wang
authors.forename: Xue
authors.initials: X
authors.lastname: You
authors.forename: Cuiming
authors.initials: C
authors.lastname: Wu
authors.forename: Qiuhua
authors.initials: Q
authors.lastname: Li
authors.forename: Ming
authors.initials: M
authors.lastname: Gong
authors.forename: Tongwen
authors.initials: T
authors.lastname: Xu
mesh_terms: D000327:Adsorption; D002712:Chlorides / Q000302:isolation & purification*; D017612:Gold Compounds / Q000302:isolation & purification*; D019791:Guanidine / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000737:chemistry*; D006851:Hydrochloric Acid / Q000737:chemistry; D007474:Ion Exchange; D007475:Ion Exchange Resins / Q000737:chemistry*; D008567:Membranes, Artificial; D019216:Metals, Heavy / Q000302:isolation & purification; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D010647:Phenyl Ethers / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013818:Thermogravimetry
chemical_list: D002712:Chlorides; D017612:Gold Compounds; D006842:Hydrocarbons, Brominated; D007475:Ion Exchange Resins; D008567:Membranes, Artificial; D019216:Metals, Heavy; D010647:Phenyl Ethers; D011108:Polymers; D012996:Solutions; C488462:poly(2,6-dimethyl-1,4-phenylene oxide); C024568:gold tetrachloride, acid; D019791:Guanidine; D006851:Hydrochloric Acid