OS-PVA/P(DMC-AM)双网络水凝胶的制备及其吸附性能研究

Preparation and Adsorption Properties of OS-PVA/P(DMC-AM) Double Network Hydrogel

关键词:  氧化淀粉  双网络水凝胶  亚甲基蓝  循环吸附

Key Words:oxidized starch  double network hydrogel  methylene blue  recyclable adsorption

摘要:本研究在氧化淀粉（OS）和聚乙烯醇（PVA）的存在下，通过甲基丙烯酰氧基乙基三甲基氯化铵（DMC）和丙烯酰胺（AM）间简单的自由基聚合，制备了力学性能良好、可重复循环使用的双网络水凝胶。当OS溶液质量分数9%时，制备的水凝胶性能最佳，其压缩模量可达2.01 MPa，润胀度仅11.16 g/g，在25℃下对pH值8，浓度200 mg/L的亚甲基蓝溶液吸附480 min时吸附量最高，达602.6 mg/g。经过5次吸附-脱附过程后，双网络水凝胶对亚甲基蓝的去除率仍高达94.8%，脱附率74.2%。

Abstract:In this study， a double network hydrogel with good mechanical properties and recyclable adsorption ability was developed via simple radical polymerization between methacryloxyethyltrimethyl ammonium chloride （DMC） and acrylamide （AM） and in the presence of oxidized starch （OS） and polyvinyl alcohol （PVA）. When the concentration of OS solution was 9%， the prepared hydrogel had the best performance. The compression modulus of the hydrogel could reach 2.01 MPa， the swelling degree was only 11.16 g/g， and the maximum adsorption capacity towards methylene blue （MB） was 602.6 mg/g with pH value of 8 and MB concentration of 200 mg/L after 480 min at 25℃. After five times of adsorption-desorption process， the removal rate was still 94.8%， and the desorption rate was 74.2% of double network hydrogel towards MB.