摘要
目的利用磁性硅气凝胶吸附水中的结晶紫染料,研究其吸附行为。方法以自制的磁性硅气凝胶作为吸附剂吸附水中的结晶紫,磁铁移除吸附剂,采用紫外分光光度法测定吸附后水中残留结晶紫的含量并计算去除率。结果在中性条件下结晶紫的去除率可以达到90%以上;染料的吸附动力学符合拟二级动力学模型(R2=0.996);在298 k,pH=7的条件下,由Langmuir方程拟合的最大吸附量为172.2 mg·g^(-1);Frendlich方程和Temkin方程结果为优惠吸附,而且非均匀表面为主要吸附位点。从热力学角度看,吸附过程是自发进行的吸热反应;并且该材料可多次重复利用。结论磁性硅气凝胶吸附性能优良,具有快速分离和容易再生的优点,能够用于吸附废水中的结晶紫。
Objective To investigate the adsorption potential of magnetic silica aerogels towards crystal violet in aqueous solution. Methods The magnetic silica aerogel was used as an adsorbent to adsorb the crystal violet in the water. A magnet was used to remove the adsorbentafter the adsorption. The content of residual crystal violet in the water was determined by ultraviolet spectrophotometry and the removal rate was calculated. Results The removal rate of crystal violet was more than 90% when pH was about neutral. The adsorption kinetics followed the pseudo-second-order model. The maximum adsorption capacity calculated by Langmuir equations was 172. 2 mg·g^-1 at 298 K and pH7. Frendlich equation reflected the favorable adsorption of crystal violet on themagnetic silica aerogel. Temkin equation showed the heterogeneous surface was the main adsorption sites. And themagnetic silica aerogel could be reused several times. Conclusion The magnetic silicon aerogel shows advantages of good adsorption performance,rapid separation and easy regeneration.
作者
邓燕
张艺潇
朱红庆
李冠萃
李宏伟
梁宁
DENG Yan;ZHANG Yixiao;ZHU Hongqing;LI Guancui;LI Hongwei;LIANG Ning(School of Pharmaceutical Engineering,Shenyang Pharmaceutical University,Benxi 117004,China)
出处
《沈阳药科大学学报》
CAS
CSCD
北大核心
2018年第7期587-592,共6页
Journal of Shenyang Pharmaceutical University
基金
辽宁省大学生创新创业训练计划项目(201610163028)
