含氨基磁性微球的制备及其对酸性橙7的吸附性能  

Preparation of the magnetic microbeads with amino groups and its adsorption properties foracid orange 7

作　　者：王凯[1,2] 曹洪玉[1] 靳瑞发[1] 孙菱翎[1] 李秀华[1] 邱广明[2] 

机构地区：[1]赤峰学院化学化工学院内蒙古自治区光电功能材料重点实验室,内蒙古赤峰024000 [2]内蒙古工业大学能源与动力学院,呼和浩特010051

出　　处：《功能材料》2015年第21期21137-21143,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51263013);内蒙古自治区高等学校科学研究资助项目(NJZC14273);内蒙古自然科学基金面上资助项目(990301-5;2014MS0215)

摘　　要：采用悬浮聚合法制备了磁性微球(MM),利用乙二胺与磁性微球进行开环反应得到表面含有氨基的磁性微球(MM-EDA)。通过扫描电镜(SEM)、BET比表面积、傅里叶红外光谱(FT-IR)和样品磁力振荡计(VSM)进行了表征,并将其应用于对染料酸性橙7(AO7)的吸附。探索了初始浓度、吸附时间、pH值和共存离子等条件对吸附的影响,研究了MM-EDA对AO7的吸附性能与吸附机理。结果表明,在pH值=3左右溶液中,吸附量最大。在室温下,吸附在120min内达到饱和,且对AO7的饱和吸附量接近300mg/g。吸附规律较好地符合准二阶动力学吸附方程和Langmuir等温吸附模型;热力学参数(ΔG°,ΔH°和ΔS°)说明吸附为自发、吸热的熵增加过程,升温有利于吸附;MM-EDA可重复使用。Magnetic microbeads(MM)were synthesized by suspension polymerization and then reacted with ethylenediamine to yield magnetic microbeads with amino groups(MM-EDA).The final product was characterized by scanning electron microscope(SEM),BET surface area,Fourier transform infrared spectrometer(FT-IR),and vibrating sample magnetometer(VSM).MM-EDA were used to adsorb acid orange 7(AO7)from aqueous solution.Effect of initial concentration,pH,coexisting ions and contact time on adsorption amount of AO7 was investigated.The experimental results indicated the highest adsorption capacity of AO7 was around pH=3.At room temperature,the adsorption of AO7 on MM-EDA reached equilibrium within 120 min and saturated adsorption capacity for AO7 was approximately 300mg/g.The adsorption isotherm can be well described by the Langmuir equation and the adsorption kinetics fitted to the pseudo-second-order model.The thermodynamic parameters(ΔG°,ΔH°andΔS°)indicated that the adsorption was spontaneous and endothermic process with increased entropy,and higher temperature would benefit the adsorption.The adsorbent can be repeatedly utilized with no significant loss of adsorption capacity.

关 键 词：悬浮聚合 磁性微球 乙二胺 吸附 酸性橙7 

分 类 号：TB332[一般工业技术—材料科学与工程] O647.3[理学—物理化学]