壳聚糖-稀土-生物炭对水体Cr(Ⅵ)的吸附性能分析  

Adsorption Performance of Chitosan‐Rare Earth‐Biochar Composite for Cr(Ⅵ)in Water

作　　者：孟阳 魏太庆 艾丹 王博[1] 范志平[1] Meng Yang;Wei Taiqing;Ai Dan;Wang Bo;Fan Zhiping(School of Environmental and Safety Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China)

机构地区：[1]辽宁石油化工大学环境与安全工程学院,辽宁抚顺113001

出　　处：《辽宁石油化工大学学报》2023年第3期14-20,共7页Journal of Liaoning Petrochemical University

基　　金：国家自然科学基金项目(41977074)。

摘　　要：以玉米秸秆为生物炭原料,通过壳聚糖和稀土对其改性,分别制备了壳聚糖-氯化镧-生物炭复合材料(CBC-La)和壳聚糖-氯化铈-生物炭复合材料(CBC-Ce)。采用XRF、FT-IR和XRD对CBC-La和CBC-Ce的结构与性能进行分析,探究了不同吸附条件下对水体Cr(Ⅵ)的吸附性能。结果表明,Langmuir方程能够很好地模拟等温吸附行为,准一级动力学方程的拟合度较高,CBC-La和CBC-Ce的平衡吸附量理论值分别为21.08、19.16 mg/g,表现出良好的吸附效果。解吸实验结果表明,CBC-La和CBC-Ce具有重复使用的可能性;吸附机制主要包括静电作用、氢键作用和离子交换。实验证明,壳聚糖-稀土-生物炭复合材料对去除水体Cr(Ⅵ)具有良好的应用前景。Using corn straw as raw material of biochar and modified with chitosan and rare earth,chitosan-lanthanum chloride-biochar composites and chitosan-cerium chloride-biochar composites were prepared respectively.The structure and performance of CBC-La and CBC-Ce were analyzed by XRF,FT-IR and XRD.The adsorption properties of Cr(Ⅵ)in water under different adsorption conditions were investigated.The experimental results show that the Langmuir equation can simulate the isothermal adsorption behavior well,and the quasi-first-order kinetic equation has a higher fitting degree.The theoretical equilibrium adsorption capacity are 21.08 mg/g and 19.16 mg/g,which is close to the actual value.The desorption experiments show that CBC-La and CBC-Ce had the possibility of reuse.The adsorption mechanism mainly includes electrostatic adsorption,complexation and ion exchange.The experimental results show that the chitosan-rare earth-biochar composite material has a good application prospect in the removal of Cr(Ⅵ)from water.

关 键 词：生物炭 氯化镧 氯化铈 壳聚糖 六价铬 吸附 

分 类 号：TE992.1[石油与天然气工程—石油机械设备]