摘要
使用玉米芯纤维素结合羧甲基化修饰制备高吸水性水凝胶,引入氨氮吸附功能,制备出一种高效保水保肥材料CCH/Z,通过SEM、FTIR、接触角等测试对其微观结构、官能团组成、亲水性进行了分析,并通过吸水溶胀实验和氨氮吸附实验,测试了合成材料的保水保肥性能.结果表明,CCH/Z保水率可达到452.49％,在保肥方面,当CCH/Z用量为0.15 g时,在100 mg/L氨氮溶液中,吸附率可达41.4％,准一级动力学模型、准二级动力学模型均可以描述吸附氨氮行为,热力学分析表明,CCH/Z的吸附行为符合Freundlich模型.
Abstract
Corncob cellulose combined with carboxymethylation was used to prepare a superabsorbent hydrogel,ammonia nitrogen adsorption was introduced to prepare a highly efficient water and fertilizer retention material(CCH/Z).The microstructure,functional group composition and hydrophilicity of the syn-thetic material were analyzed by SEM,FTIR and contact Angle tests.The water and fertilizer retention per-formance of the synthetic material was tested by water swelling experiment and ammonia nitrogen adsorption experiment.The results showed that the water retention rate of CCH/Z could reach 452.49％.In terms of fertilizer retention,the adsorption rate in 100 mg/L ammonia nitrogen solution could reach 41.4％when the amount of CCH/Z was 0.15 g.Both the pseudo-first-order kinetic model and the pseudo-second-order model kinetic model can describe the ammonia nitrogen adsorption behavior of CCH/Z.Thermodynamic analysis showed that the adsorption behavior of CCH/Z was in accordance with the Freundlich model.
基金项目
陕西省自然科学基础研究计划资助项目(2020JM-226)
陕西省教育厅科学研究计划项目资助(22JE003)
NETL
NSTL
万方数据