期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/ijms232314556
关键词
MIL-88A(Fe); layered double hydroxides; core-shell structure; adsorption; Pb2+
资金
- State Administration of Science, Technology and Industry for National Defence, China [[2017]1474]
This study synthesized a novel nanostructure of MIL-88A-layered double hydroxides (LDHs) as an adsorbent for Pb2+ by solvothermal method. The as-prepared MIL-88A-LDHs exhibited excellent removal performance towards Pb2+ from water.
The efficient removal of lead (II) from aqueous solution remains a big problem and the development of novel nanomaterials as adsorbents by various technologies to solve this problem is promising. This study contributed a novel nanostructure of MIL-88A-layered double hydroxides (LDHs) as the adsorbent for Pb2+, which was synthesized by a two-step solvothermal method with MIL-88A(Fe) as the precursor. The as-prepared material featured a chestnut-like core-shell structure, and exhibited excellent removal performance towards Pb2+ from water in comparison to MIL-88A(Fe) and LDHs (directly synthesized). The adsorption of Pb2+ by the MIL-88A-LDHs conformed to the pseudo-second-order kinetic model and the Langmuir and Freundlich isotherm models. The maximal adsorption capacity was 526.32, 625.00, and 909.09 mg g(-1) at 278, 298, and 318 K, respectively. The thermodynamic parameters suggested that the adsorption was an endothermic, entropy-increasing, and spontaneous reaction. X-ray photoelectron spectroscopy (XPS) analysis indicated that the surface complexation was mostly responsible for Pb2+ elimination. The MIL-88A-LDHs can be readily regenerated and showed good cyclic performance towards Pb2+. Thus, the as-prepared MIL-88A-LDHs may hold promise for the elimination of aqueous heavy metals.
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