title: Heavy metal precipitation by polycation-polyanion complex of PEI and its phosphonomethylated derivative.
abstract: The removal of various heavy metal ions such as Cu2+, Co2+, Zn2+, Ni2+ and Pb2+ from aqueous solutions by precipitation with polyelectrolyte complex of PPEI and PEI was conducted. Heavy metal binding with PPEI was initially allowed to occur and then upon equilibration, PEI was added to initiate precipitation of the polyelectrolyte complex together with the heavy metal ion. The PPEI-PEI system was found effective for heavy metal scavenging purposes even in the presence of high concentrations of non-transition metal ions like Na+. Heavy metal concentration may be reduced beyond emission standards for industrial wastewaters. The PPEI-PEI polyelectrolyte complex was found to be more effective than traditional precipitation methods for the treatment of a representative electroless Ni plating waste solution.
authors.affiliation: Department of Chemical Engineering, College of Engineering and Agro-Industrial Technology, University of the Philippines, Los Banos College, Laguna 4031, Philippines.
authors.forename: Ronald R
authors.initials: RR
authors.lastname: Navarro
authors.forename: Shinji
authors.initials: S
authors.lastname: Wada
authors.forename: Kenji
authors.initials: K
authors.lastname: Tatsumi
mesh_terms: D011232:Chemical Precipitation; D019216:Metals, Heavy / Q000737:chemistry*; D011073:Polyamines / Q000737:chemistry; D000071228:Polyelectrolytes; D011094:Polyethyleneimine / Q000031:analogs & derivatives / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D014877:Water Pollution, Chemical / Q000517:prevention & control
chemical_list: D019216:Metals, Heavy; D011073:Polyamines; D000071228:Polyelectrolytes; D011094:Polyethyleneimine; D011108:Polymers; D014874:Water Pollutants, Chemical