Synthesis and Study of Amphoteric Starch-Based Flocculants Based on Heavy Metal Adsorption Function
Amphoteric starch based flocculant was synthesized by semi-dry method with acrylamide(AM),acrylylloxyethyltrimethyl ammonium chloride(DAC)and cerium ammonium nitrate as monomers.The process and flocculation performance of amphoteric starch based flocculant were discussed.The effects of phosphate mass fraction,pH,urea mass fraction,reaction temperature and reaction time on phosphorylation were investigated.The effects of initial pH,adsorption time and initial mass concentration on adsorption properties were studied.The modified samples were characterized by scanning electron microscopy(SEM),Fourier infrared spectrometer(FT-IR),hydrogen nuclear magnetic resonance(1HNMR)and X-ray diffractometer(XRD)to observe theirmorphology,functional groups and structure.The optimum synthesis process was as follows:phosphate mass fraction 30%,reaction system pH=7,urea mass fraction 20%,reaction temperature 130℃,reaction time 150 min.The results showed that when pH=5,adsorption time was 90 min,and initial mass concentration of Cu2+was 250 mg·L-1,amphoteryl starch based flocculant had the best performance.The adsorption process followed the second-order kinetic model and had certain acid-alkali resistance,salt resistance and shear resistance.
Amphoteric starchHeavy metal adsorptionFlocculantAdsorption kinetic
万方数据
维普
