热重分析
吸附
X射线光电子能谱
氢氧化物
傅里叶变换红外光谱
化学
碳化
金属有机骨架
化学吸附
无机化学
朗缪尔吸附模型
纳米复合材料
核化学
化学工程
材料科学
有机化学
纳米技术
工程类
作者
Haishuang Cai,Kaiming Ma,Ye Zhang,Yunhui Huang,Wentao Wang,Shanshan Tong
标识
DOI:10.1007/s44246-023-00058-0
摘要
Abstract A novel sorbent ZIF-67/LDH@C was synthesised using mild etching and co-precipitation and carbonization calcination for the elimination of lead ions (Pb 2+ ), malachite green (MG), and congo red (CR) from water. The three-dimensional hollow MOF structure and two-dimensional LDH nanosized layers of ZIF-67/LDH@C were demonstrated by scanning electron microscope (SEM), transmission electron microscopy (TEM), fourier transform infrared (FT-IR), X-ray diffraction (XRD), nitrogen adsorption/desorption, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) characterization. The maximal adsorption capability of Pb 2+ , MG, and CR could reach 662.25, 1729.83 and 526.32 mg∙g −1 , respectively. The kinetic study proved that the adsorption was chemisorption or strong complexation and the rate-limiting step was intraparticle diffusion. The isotherms effectively indicated the monomolecular-type adsorption. Thermodynamic studies showed the spontaneous and endothermic nature of Pb 2+ , MG and CR adsorption onto ZIF-67/LDH@C. The adsorption mechanisms of ZIF-67/LDH@C may be attributed to electrostatic attraction, π-π interaction, hydrogen-bonding interaction, and surface complexation between ZIF-67/LDH@C and pollutants. Furthermore, favourable stability and negligible interference from other metal ions could promote the viability of the practical application of ZIF-67/LDH@C in wastewater purification. Graphical Abstract
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