The Synthesis Of Transformation Of Acrylic-acid Sodium Salt And Its Chelate To Pb～(2+),Zn～(2+),Ni～(2+) In Water

The paper summarizes properties, uses, and synthesis of acrylic-acid sodium salt(AA-Na). By putting up maleic anhydride(MA) intoacrylic-acid--acrylic-acid copolymer(MA-CO-AA) is synthesized. This syntheticmaterial could be applied in such respects as Phosphate-free,which owns excellent chelate ability and dispersibility to Ca2+, Mg2+. In addition, the chelate ability to Pb2+, Zn2+, Ni2+ in waste water is also studied in this paper.Through experience, the technological conditions of synthesising MA-CO-AA are optimized. The ratio of AA and MA is 4 to 1, initiation agent takes up 4-6%, reducer does 5-7%, reaction temperature 80-90C, reaction time 3 h.,and designed solid content of 35-40%. Under such technological conditions, the light yellow transparent liquid can be obtained. The analysis with infrared spectroscopy(IR) proves the rational conditions provided.When MA-CO-AA is applied to chelate Ca2+ Mg2+ in water, its biggest chelate ability is 425mgCaCO3 /g 360mgMgCO3/g. Which appears much better than that of AA, 367 mgCaCO3/g, 302 mgMgCO3/g.When MA-CO-AA is applied to chelate Pb2+, Zn2+, Ni2+ in waste water, the best chelate conditions of various ions can be defined through orthogonal experiments . By means of isothermal adsorption chelate of each proportional MA-CO-AA to Pb2+, Zn2+, Ni2+ , the biggest chelate ability of each ions can be obtained, Pb2+: 922mg/g, Zn2+: 264mg/g, Ni2+: 201.3mg/g. Hence the best proportional of MA-CO-AA can be obtained.With good biological degradation,higher softening nature and better heating stability. It is estimated that much more satisfactory results can be caused if the MA-CO-AA can be used in other methods to remove heavy metals- Pb2+, Zn2+, Ni2+ in waste water.