磁性灭藻剂的制备及性能分析

Preparation and Characterization of Magnetic Algicide

以壳聚糖为原料,用反相悬浮聚合法合成磁性壳聚糖微球(MCS),经进一步改性,制备出磁性灭藻剂———载铜磁性壳聚糖微球.采用傅里叶变换红光谱对样品进行表征,并研究MCS的载铜能力和载铜MCS的释铜性能.研究结果表明:硫酸铜初始质量浓度为750mg.L-1,MCS用量为15mg,pH值为5,吸附平衡时间为15min,温度为25℃,是MCS对Cu2+的最佳载铜条件.载铜MCS的释铜量随着时间和用量的增加而增加,且载铜MCS的用量在比较低的情况下,理论上能保证有效而持续地灭藻;当pH值在6～8的范围内变化时,对释铜量影响不大.

With chitosan as raw material,magnetic chitosan microspheres（MCS） were prepared through inverse suspension cross-linking,then a new magnetic algicide—magnetic chitosan microspheres carrying copper（i.e.MCS-Cu） was prepared by further modification,and its structure was characterized by infrared spectrum.The adsorption ability of MCS toward Cu2＋ and desorption performance of MCS-Cu toward Cu2＋ were studied.Results showed that the optium adsorption as follows： initial concentration of Cu2＋ was 750 mg·L-1,the dosage of MCS was 15 mg,pH was 5,adsorption equilibrium time was 15 min,temperature was 25 ℃.The quantity of Cu2＋ released from MCS-Cu increased with time extending and raise of MCS-Cu dosage,and theoretically,it could guarantee removal efficiency of algae efficiently and continually.But the quantity of Cu2＋ released from MCS-Cu didn′t change obviously when pH varied from 6 to 8.