摘要
以海带多糖(LJP)、海藻酸钠(SA)为原料制备水凝胶微球LJP@SA,采用XRD、SEM、BET方法分析LJP@SA的结构与形貌,在优化吸附参数的基础上,研究其对CV的吸附性能,利用FT-IR、XPS方法探究吸附机理。结果表明,添加60%LJP制备的LJP-60@SA具有相对较高的CV吸附量,微球表面粗糙,截面具大量孔隙结构,平均孔径18.3 nm,比表面积25.4557 m^(2)/g,吸附孔容0.066426 cm^(3)/g。当CV初始质量浓度100 mg/L,投加量1.0 g/L,pH8.0,温度25℃时,LJP-60@SA对CV的去除率达94%以上。吸附过程是吸热的单分子层吸附,符合Langmuir等温模型和拟二阶动力学模型。LJP-60@SA经5次吸附-解吸后,对CV的吸附率仍在90%以上。吸附机理涉及氢键、静电相互作用、离子交换、化学反应。LJP-60@SA可以作为一种高效、环保、可循环利用的吸附剂用于CV废水的净化。
Hydrogel microspheres LJP@SA were prepared withLaminaria japonica polysaccharides(LJP)and sodium alginate(SA)as the raw materials.The structural and morphological properties of LJP@SA were analyzed via methods of XRD,SEM and BET.With adsorption parameters optimized,the adsorption performance of LJP@SA on CV was studied,and the adsorption mechanism was explored by FT-IR and XPS methods.Results showed that LJP-60@SA prepared by adding 60%LJP has a relatively high CV adsorption capacity.The surface of the microspheres was rough,and the cross-section had a large number of pore structures,with an average pore diameter of 18.3 nm,a specific surface area of 25.4557 m^(2)/g,and an adsorption pore volume of 0.066426 cm^(3)/g.When the initial concentration of CV was 100 mg/L,with dosage of 1.0 g/L,pH of 8.0,and temperature of 25℃,the removal rate of LJP-60@SA on CV reached over 94%.The adsorption process was an endothermic monolayer adsorption,which conformed to the Langmuir isothermal model and the pseudo-second-order kinetic model.After 5 adsorption-desorption cycles,the adsorption rate on CV by LJP-60@SA remained above 90%.The adsorption mechanism involved hydrogen bonds,electrostatic interactions,ion exchange,and chemical reactions.LJP-60@SA can be used as an efficient,environmentally friendly,and recyclable adsorbent for the purification of CV wastewater.
作者
杜国丰
陈小焕
薛志爽
梁海
DU Guofeng;CHEN Xiaohuan;XUE Zhishuang;LIANG Hai(College of Chemistry and Environmental Engineering,Yingkou Institute of Technology,Yingkou 115014,China;Liaoning Key Laboratory of Chemical Additive Synthesis and Separation,Yingkou 115014,China)
出处
《水处理技术》
2026年第2期78-85,共8页
Technology of Water Treatment
基金
辽宁省教育厅高等学校基本科研项目(LJKMZ20221862)
辽宁省“兴辽英才计划”(XLYC2007185)
营口理工学院大学生创新创业项目(X202314435007)。
关键词
海带多糖
水凝胶微球
结晶紫
吸附机理
laminaria japonica polysaccharides
hydrogel microsphere
crystal violet
adsorption mechanism
