Adsorption Properties of Pb2+ by Amino Group's Functionalized Montmorillonite from Aqueous Solutions

作者：Wang, Along; Chu, Yuting; Muhmood, Tahir; Xia, Mingzhu^*; Xu, Ying; Yang, Lei; Lei, Wu; Wang, Fengyun^*

来源：Journal of Chemical and Engineering Data, 2018, 63(8): 2940-2949.

DOI：10.1021/acs.jced.8b00239

• LOW-COST ADSORBENT
• HEAVY-METAL IONS
• ACTIVATED CARBON
• HEXAVALENT CHROMIUM
• MODIFIED BENTONITE
• REMOVAL
• PB(II)
• EQUILIBRIUM
• WATER
• CLAY

The remediation of wastewater containing Pb2+ has attracted much attention due to the harm of Pb2+ to the environment and human health. A promising adsorbent, functionalized montmorillonite modified with a ligand diethylenetriamine (DETA) was prepared under mild reaction conditions. The modified montmorillonite (DETA-MMT) and nature montmorillonite (Na-MMT) were then characterized with the help of XRD, FTIR, TG/DTG, and BET. It was revealed that the modifier DETA was successfully inserted into interlayers of montmorillonite, as demonstrated by the characterizations. Batch adsorption experiments of Pb2+ onto Na-MMT and DETA-MMT in solutions were studied as a function of various parameters, such as pH, contact time, initial concentration, and temperature. The maximum adsorption capacity of DETA-MMT was 61.1 mg g(-1),which had more than doubled compared with that of NaMMT. The adsorption thermodynamics of Pb2+ by DETA-MMT was studied, and it showed a endothermic process. The adsorption kinetics of two samples both fit well with the pseudo-second-order model. The adsorption isotherms of Na-MMT and DETA-MMT can be well described by the Langmuir isotherm and Freundlich isotherm, respectively. Furthermore, the adsorbed Pb2+ onto DETA-MMT can hardly be dissolved under weak acidic condition (pH >4) according to the desorption experiments of simulated acid rain and Tessier's sequential extraction procedure.

• 出版日期2018-8
• 单位南京理工大学