The Synthesis Of Spherical Lignin Adsorbent And Its Adsorption Character On Metal Ions

In order to strength the adsorption performance of lignin to metals in wastewater, Three adsorbents named spherical triethylenetetramine based lignin, spherical diethanolamine based lignin and spherical L-asparagine lignin were prepared by inverse suspension polymerization technique in this paper using alkaline lignin, triethylenetetramine, diethanolamine and L-asparagine as raw materials. Determine their adsorbility on Cu2+、Pb2+and Cd2+in the simulation environment which contain heavy metal. This dissertation was partial content of Special Fund for Forestry Industry Research in the Public Interest (200904072).Optimum conditions of synthesizing TETA-L based on nitrogen content was determined by single factor. Result showed that the synthetical condition of TETA-L was obtained as AL1g,30mL sodium hydroxide solution,30mL TETA, reaction temperature50℃and reaction time3hours. The nitrogen content of TETA-L was4.75%. The product was characterized by FTIR, CPMA13CNMR and SEM. By the kinetic curve, we can see that the adsorption capacity on Cu2+and Pb2+get to balance in six hours and two hours, the adsorption capacity achieves maximum as189.50mg/g and84307.69mg/g. The linear equation were calculated by fitted the adsorption isotherms using Freundich equation. The linear equation of Cu2+:lg AC)=0.20231gCe+1.4187, R=0.7561. The linear equation of Pd2+:lg(AC)=0.8471gCe+1.603, R=0.9829.The spherical diethanolamine based lignin was prepared by inverse suspension polymerization technique in this paper, by alkaline lignin and diethanolamine as raw materials. The products were characterized by FTIR and SEM. The analysis of FTIR confirmed the introduction of diethanolamine into the lignin molecular, and its N content is1.66%. Determine its adsorbility on Cu2+and Cd2+in the simulation environment which contain heavy metal. By the kinetic curve, we can see that the adsorption capacity on Cu2+and Cd2+get to balance in six hours and four hours, the adsorption capacity achieves maximum as24.12mg/g and43.27mg/g. The linear equation were calculated by fitted the adsorption isotherms using Freundich equation. The linear equation of Cu2+:lg(AC)=2.13391gCe-1.0235,R=0.9799.L-asparagine lignin was synthesized by lignin and L-asparagine as materials through Mannich reaction. The optimum reaction conditions were obtained as follows:reaction temperature at75℃, n (lignin):n (formaldehyde):n (L-asparagine)=1.5:1:1and reaction time4h. Determine its adsorbility on Cu+and Pb+in the simulation environment which contain heavy metal. By the kinetic curve, we can see that the adsorption capacity on Cu2+and Pb2+get to balance in four hours and eight hours, the adsorption capacity achieves maximum as201.08mg/g and104265.73mg/g. The linear equation were calculated by fitted the adsorption isotherms using Freundich equation. The linear equation of Cu2+:lg(AC)=2.31051gCe4.0432, R=0.9762. The linear equation of Pd2+:lg(AC)=0.6801gCe+4.103,R=0.9975.