pH敏感性β-环糊精微球的制备及其吸附性能

采用反相微悬浮乳液聚合技术制备了β-环糊精(β-CD)微球,用丁二酸酐对β-CD微球进行化学改性,制备了pH敏感性β-CD(pH-β-CD)微球.通过傅里叶红外光谱仪和扫描电子显微镜对微球的结构、粒径和形貌进行了表征.探讨了亚甲基蓝模拟染料废水pH、吸附时间和微球加入量对亚甲基蓝吸附性能的影响.实验结果表明,在亚甲基蓝模拟染料废水pH为10.0、吸附时间为90 min的条件下,当pH-β-CD微球加入量为50 mg时,pH-β-CD微球吸附量为16.1 mg/g;当pH-β-CD微球加入量为250 mg时,pH-β-CD微球对亚甲基蓝的脱色率达96.2%.

Preparation of pH-sensitive β-Cyclodextrin Microspheres and Their Adsorption Capabilities

β-Cyclodextrin (β-CD) microspheres were prepared by inverse micro-suspension polymerization technology, and were chemically modified by succinic anhydride to prepare pH-sensitive β-CD (pH-β-CD) microspheres. The chemical structure, particle size and morphology of the microspheres were characterized by FTIR and SEM. The factors affecting the adsorption capability of the microspheres on methylene blue were investigated, such as the pH of simulated wastewater containing methylene blue, the adsorption time and the dosage of microspheres. The experimental results indicate that, under the conditions of wastewater pH 10.0 and adsorption time 90 min, the adsorption quantity to methylene blue is 16.1 mg/g when the dosage of pH-β-CD microspheres is 50 mg, and the decolorization rate is 96.2% when the dosage of pH-β-CD microspheres is 250 mg.