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以纤维素与硅藻土为原料制备纤维素/硅藻土复合气凝胶。研究了影响纤维素/硅藻土复合气凝胶吸附的因素,以及复合气凝胶吸附亚甲基蓝的等温曲线、动力学与热力学特性。结果表明,纤维素/硅藻土复合气凝胶中硅藻土最佳含量为0.5 g,随着pH值的提高,纤维素/硅藻土复合气凝胶吸附量增大,碱性条件下最好。纤维素/硅藻土复合气凝胶的吸附量符合Langmuir及伪二级动力学模型,最大吸附量为68.399 5 mg/g。热力学研究表明,纤维素/硅藻土复合气凝胶吸附亚甲基蓝是自发、放热的物理吸附过程。
Cellulose / diatomite composite airgel was prepared from cellulose and diatomite. The factors affecting the adsorption of cellulose / diatomite composite aerogels and the isothermal curves, kinetics and thermodynamic properties of the adsorption of methylene blue on the aerogels were studied. The results showed that the optimal content of diatomite in cellulose / diatomite composite aerogels was 0.5 g. With the increase of pH value, the adsorption amount of cellulose / diatomite composite aerogels increased. Under alkaline conditions the best. The adsorption capacity of cellulose / diatomite composite aerogels accorded with Langmuir and pseudo-second-order kinetic model with the maximum adsorption capacity of 68.399 5 mg / g. Thermodynamic studies show that cellulose / diatomite composite airgel adsorbed methylene blue spontaneous and exothermic physical adsorption process.