Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, 624 302 Dindigul, Tamil Nadu, India.
Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, 624 302 Dindigul, Tamil Nadu, India.
Int J Biol Macromol. 2019 Mar 1;124:492-504. doi: 10.1016/j.ijbiomac.2018.11.127. Epub 2018 Nov 16.
The present investigation was carried out for the removal of phosphate and nitrate ions from aqueous solution using lanthanum incorporated chitosan membrane (La@CS) prepared by casting method. Systematic adsorption studies were performed by varying the influencing parameters like contact time, dosage, pH, interfering anions and temperature were optimized for the maximum phosphate and nitrate adsorption capacities. The adsorption equilibrium process was examined by Freundlich, Langmuir and Dubinin-Radushkevich isotherm models. The La@CS membrane showed an adsorption capacity of 76.6 and 62.6 mg/g for phosphate and nitrate ions respectively. Thermodynamic parameters such as ∆G°, ∆H° and ∆S° were calculated to understand the nature of adsorption. The synthesized La@CS membrane was characterized by FTIR, SEM, EDAX with mapping analysis, XRD, AFM, TGA-DSC and zero point charge analysis. The possible adsorption mechanism was found to be electrostatic attraction as well as by ion exchange between La@CS membrane and both anions like phosphate and nitrate. The experimental results clearly indicated that the prepared La@CS membrane could be utilized for the removal of phosphate and nitrate ions from aqueous solution.
本研究采用浇铸法制备了镧掺杂壳聚糖膜（La@CS），用于从水溶液中去除磷酸盐和硝酸盐离子。通过改变影响因素，如接触时间、剂量、pH 值、干扰阴离子和温度等，进行了系统的吸附研究，以优化最大磷酸盐和硝酸盐吸附容量。通过 Freundlich、Langmuir 和 Dubinin-Radushkevich 等温模型研究了吸附平衡过程。La@CS 膜对磷酸盐和硝酸盐离子的吸附容量分别为 76.6 和 62.6mg/g。计算了热力学参数，如 ∆G°、∆H°和 ∆S°，以了解吸附的性质。通过 FTIR、SEM、EDAX 及其映射分析、XRD、AFM、TGA-DSC 和零点电荷分析对合成的 La@CS 膜进行了表征。发现吸附的可能机制是静电吸引以及 La@CS 膜与磷酸盐和硝酸盐等阴离子之间的离子交换。实验结果清楚地表明，制备的 La@CS 膜可用于从水溶液中去除磷酸盐和硝酸盐离子。
