表面接枝聚合物磁性硅球的合成及對pb39;2的去除

1、華中科技大學碩士學位論文表面接枝聚合物磁性硅球的合成及對Pb的去除姓名：王世珍申請學位級別：碩士專業(yè)：有機化學指導教師：彭紅20090524華 中 科 技 大 學 碩 士 學 位 論 文 II Abstract Lots of research have focused on development of new magnetic absorbents for removal of hea

2、vy metals from enviroment due to its fast and easy separation from solution using an external magnetic field in recent years In this paper, mono- dispersed magnetic core- shell silic microsphere (MS) was

3、 prepared, and then abundant chelator groups (IDA) were grafted on MS by a modified solvent polymerization of GMA- IDA monomer. Anovel magnetic absorbent named PMS full of chelators was prepared and c

4、haracterized, and its application in removal of heavy metal ions was further investigated: 1. MS was prepared in sol- gel method using high magnetic Fe3O4 microsphere synthesized by solvent reduc

5、tion method as core and SiO 2 as shell .and then PMS was prepared in graft polymerization of GMA- IDA monomer with MS. The structures and properties of MS and PMS were characterized by IR,SEM，VSM an

6、d TG .. The results showed that MS was mono- dispersed microsphere, and the polymer- grafted ratio of PMS was 46.5%. Both MS and PMS were super- paramagnetism with saturation magnetization of 63.5 and 28.4 emu/g respect

7、ively at room temperature. 2. The a dsorption properties of PMS and MS to heavy metals especially for Pb2+ were investigated. The results indicated that PMS was much better than MS in absorpti

8、on of Pb2+. MS had nearly no adsorption ability when the pH values of the solutions were less than 3, however the removal ratio of PMS was above 80%. The absorption equilibrium for PMS abs

9、orption of Pb2+achieved was within 5 min, while for MS was more than 5h. Both absorption pattern of Pb2+onto MS and PMS highly fitted Langmuir adsorption isotherm equation. The maxium adsorpti

10、on capacity of MS and PMS for Pb2+ was 8.94 and 54.35 mg/g, respectively. Key word: magnetic Fe3O4 microsphere; magnetic core- shell silic microsphere; grafted polymerization; removal of heavy m