吸附
密度泛函理论
化学
傅里叶变换红外光谱
水溶液
红外光谱学
金属
无机化学
离子
水溶液中的金属离子
结晶学
物理化学
计算化学
有机化学
化学工程
工程类
作者
Lei Xu,You‐Nian Liu,Jingang Wang,Ying Tang,Zhe Zhang
标识
DOI:10.1016/j.jhazmat.2020.124140
摘要
Amino-modified attapulgite (M-ATP) was prepared to remove Pb2+ and Cu2+ from the aqueous solution. Fourier transform infrared spectroscopy (FT-IR) spectrums and X-ray powder diffraction (XRD) patterns revealed that a new Si–O–Si bond formed after modification. The result indicates that the graft reaction of ATP occurred at Si–O (2 0 0) tetrahedron crystal face. No matter whether in a single or binary heavy metal ion system, the adsorption experiments displayed that the equilibrium adsorption capacity of M-ATP towards Pb2+ was much higher than Cu2+, which indicated M-ATP more readily adsorbs the Pb2+. The selective adsorption mechanism of Pb2+ and Cu2+ on modified attapulgite was studied by density functional theory (DFT). The Eads of Pb (− 2.01 eV) adsorbed on M-ATP is lower than Cu (− 1.79 eV) through the DFT calculation of adsorption energy (Eads), which indicate that the Pb2+ adsorbed on M–ATP is more stable than Cu2+. Both adsorption experiments and theoretical calculations revealed that due to the stability of Pb2+ adsorption on M-ATP, Pb2+ is more readily adsorbed by M-ATP, and it is difficult for Cu2+ to exchange Pb2+ from M-ATP.
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