Efficient removal of Pb( II) from aqueous solution by a novel ion imprinted magnetic biosorbent: Adsorption kinetics and mechanisms
Efficient removal of Pb( II) from aqueous solution by a novel ion imprinted magnetic biosorbent: Adsorption kinetics and mechanisms
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新型离子印迹磁性生物吸附剂从水溶液中有效去除 Pb(II)：吸附动力学和机制
DOI：
10.1371/journal.pone.0213377
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发表时间：
2019-03-27
期刊：
影响因子：
3.7
通讯作者：
Duan, Yanying
中科院分区：
文献类型：
--
作者：
He, Yayuan;Wu, Pian;Duan, Yanying
在应用吸附剂去除水溶液中的重金属时，了解吸附机理和确定吸附动力学至关重要。利用壳聚糖（CTS）、粘质沙雷氏菌（Serratia marcescens）和Fe3O4之间的交联反应和铅离子印迹技术，制备了一种铅离子印迹磁性生物吸附剂（Pb（II）-IMB）。研究了溶液pH值、吸附剂用量、选择性吸附和解吸等因素对Pb（II）-IMB吸附铅离子的影响。采用BET、XRD、VSM、SEM和EDS等手段对吸附剂进行了表征。研究了Pb（II）-IMB对Pb（II）的吸附动力学、平衡和热力学。结果表明，吸附动力学过程符合二级动力学方程。Pb（II）-IMB对Pb（II）的吸附等温线符合Langmuir吸附模型。热力学研究表明Pb（II）-IMB对Pb（II）的吸附具有自发和吸热的性质。采用傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）研究了Pb（II）-IMB的吸附机理。结果表明，Pb（II）-IMB中氨基上的氮和羟基上的氧为配位原子。
It is vital to understand the adsorption mechanisms and identify the adsorption kinetics when applying an adsorbent to remove heavy metals from aqueous solution. A Pb(II) imprinted magnetic biosorbent (Pb(II)-IMB) was developed for the removal of Pb2+ via lead ion imprinting technology and crosslinking reactions among chitosan (CTS), Serratia marcescens and Fe3O4. The effect of different parameters such as solution pH, adsorbent dosage, selectivity sorption and desorption were investigated on the absorption of lead ion by Pb(II)-IMB. The adsorbent was characterized by a Brunauer-Emmett Teller (BET) analysis, X-ray diffraction (XRD), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The adsorption kinetics, equilibrium and thermodynamics of Pb(II)-IMB for Pb(II) were studied. The results of the abovementioned analyses showed that the adsorption kinetic process fit well with the second-order equation. The adsorption isotherm process of Pb(II) on the Pb(II)-IMB was closely related to the Langmuir model. Thermodynamic studies suggested the spontaneous and endothermic nature of adsorption of Pb(II) by Pb(II)-IMB. The adsorption mechanism of Pb(II)-IMB was studied by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicated that the nitrogen in the amino group and the oxygen in the hydroxyl group of Pb(II)-IMB were coordination atoms.