改性果胶-Fe3O4磁性微球制备及对Pb 2+吸附性能

合成了一种琥珀酸酐改性果胶-四氧化三铁（Fe₃O₄）磁性微球吸附剂,分别采用扫描电镜（SEM）、红外光谱（FT-IR）、X射线衍射（XRD）等手段对样品进行了表征,并研究了其吸附铅离子（Pb ²⁺）的性能。研究结果表明：成功制备了琥珀酸酐改性果胶-Fe₃O₄磁性微球,改性果胶包覆四氧化三铁几乎没有改变Fe₃O₄的尖晶石结构,其表面疏松多孔;改性果胶-Fe₃O₄磁性微球对铅离子的吸附符合准二级动力学方程、Langmuir等温吸附方程,吸附过程主要为化学吸附。最佳吸附条件：吸附时间为600 min,吸附温度为40 ℃,溶液pH为5,吸附剂添加量为20 mg,溶液中Pb ²⁺质量浓度为800 mg/L。改性果胶-Fe₃O₄磁性微球吸附剂用于脱除毛蚶子、扇贝酶解液中的Pb ²⁺,Pb ²⁺去除率分别为76.47%和80.34%,效果良好。

Preparation of modified Fe3O4-pectin magnetic microspheres and its adsorption property for Pb 2+

A new magnetic microspheres adsorbent of pectin modified by succinic anhydride was synthesized.The sampleswere characterized by means of SEM,FT-IR and XRD.The effects of the adsorbent adsorbing Pb ²⁺ were investigated.The ex-perimental results showed that the magnetic microspheres of succinic anhydride modified pectin-Fe₃O₄ were prepared successfully.The modified pectin coated Fe₃O₄ hardly changed the original structure of Fe₃O₄ spinel,and its surface became loose and porous and the adsorption of lead ions by the novel magnetic microspheres with succinic anhydride modified pectin was characterized by pseudo-second-order kinetic and Langmuir isothermal adsorption equation and the adsorption process was mainly chemical adsorption.The optimal conditions were as follows：adsorption time of 600 min,the temperature of 40 ℃,the pH=5,the adsorption dosage of 20 mg,and the solution Pb ²⁺ mass concentration of 800 mg/L.The adsorbent was used to remove Pb ²⁺ from the enzymatic hydrolysate of tegillarca granosa and scallop,with the removal rates of 76.47% and 80.34%,respectively.The effect is good.