功能介孔材料NTA-MCM-41对农药恶霉灵的 吸附研究

Adsorption properties study of hymexazol by functionalized mesoporous material NTA-MCM-41

中文关键词:  氨基三乙酸功能化的分子筛  吸附  恶霉灵

英文关键词:NTA-MCM-41  adsorption  hymexazol

中文摘要:

      目的 合成功能材料NTA-MCM-41并研究其对农药恶霉灵的吸附性能。方法 采用两步嫁接法先后用3-氨基三甲氧基硅烷和氨基三乙酸对纯硅源的MCMC-41介孔分子筛进行功能化修饰得到新型材料NTA-MCM-41, 利用正交试验方法找到其对恶霉灵吸附的最优条件。对其等温吸附曲线以及动力学数据进行拟合确定其热力学吸附方式和动力学吸附形式。通过对比实验比较功能化材料与非功能化材料的好处。结果 研究结果表明, 功能化后的材料对恶霉灵的吸附有明显的提高, 恶霉灵的最优吸附条件为初始浓度5 mg/mL, 吸附温度70 ℃, 吸附时间9 h。功能化材料吸附恶霉灵的等温吸附曲线符合弗莱特利希(Freundlich)模型, 吸附动力学符合一级反应方程。作为吸附剂的再生能力也非常好。经过五次循环吸附后, 对恶霉灵的去除率仍然达到50%以上。结论 氨基三乙酸的成功嫁接使介孔材料在吸附性方面有很大提高, 在食品安全检测方面有很好的应用前景。

英文摘要:

      Objective To study adsorption properties of hymexazol by functionalized mesoporous material NTA-MCM-41. Methods MCMC-41 was modified by NTA with two-steps synthesis method based on hydrothermal growth method after the modification by amino. The optimum condition of the experiment about NTA-MCM-41 adsorption of hymexazol was found by the orthogonal method and the models of adsorption approach were established including the thermodynamics and kinetics. The advantage of functional and nonfunctional material was proved by contrast experiments. Results The functionalized mesoporous material NTA-MCM-41 was better than MCM-41 in the field of adsorption. The optimum condition was 5 mg/mL, the temperature was 70 ℃, and the time of adsorption was 9 h. The adsorption isotherm conformed to the model of Freundich. The adsorption kinetics fit the first-order equation, and the modified adsorbent had an excellent regeneration property. Furthermore, the removal rate of hymexazol can reach 50%. Conclusion After NTA modified, the adsorption capacity can be improved obviously. The functionalized mesoporous material NTA-MCM-41 has a promising prospect.