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通过共价键合在二氧化硅表面的吡啶基吡唑-β-酮醇受体对Pb(II)的高选择性去除

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface.

作者信息

Tighadouini Said, Radi Smaail, Ferbinteanu Marilena, Garcia Yann

机构信息

Laboratoire de Chimie Appliquée et Environnement (LCAE), Faculté des Sciences and Centre de l'Oriental des Sciences et Technologies de l'Eau (COSTE), Université Mohamed Premier, 60000 Oujda, Morocco.

Faculty of Chemistry, Inorganic Chemistry Department, University of Bucharest, Dumbrava Rosie 23, 020462 Bucharest, Romania.

出版信息

ACS Omega. 2019 Feb 21;4(2):3954-3964. doi: 10.1021/acsomega.8b03642. eCollection 2019 Feb 28.

DOI:10.1021/acsomega.8b03642
PMID:31459604
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6647973/
Abstract

Efficient materials capable of capturing toxic metals from water are widely needed. Herein, a new pyridylpyrazole-β-ketoenol receptor, X-ray diffraction analyzed, was covalently incorporated into the silica surface to produce solid and recyclable adsorbent particles. The new material, fully characterized, revealed extremely efficient removal of toxic metals from water, with a selectivity order of Pb(II) > Zn(II) > Cu(II) > Cd(II). The adsorption was exceptionally rapid at optimum pH and concentrations, showing Pb(II) removal of 93 mg g within 5 min and maximum Pb(II) adsorption of 110 mg g after only 20 min. Sorption isotherms agreed well with the Langmuir model suggesting a monolayer adsorption, whereas kinetics agreed with the pseudo-second-order model suggesting a chemisorption binding mechanism. Thermodynamics of adsorption were fitted with an endothermic and spontaneous process. The material, recyclable for at least five cycles, is therefore promising for the cleanup of water polluted by toxic metals, especially lead.

摘要

能够从水中捕获有毒金属的高效材料需求广泛。在此，一种经X射线衍射分析的新型吡啶基吡唑-β-酮醇受体被共价结合到二氧化硅表面，以制备出固体且可回收的吸附剂颗粒。这种经过充分表征的新材料显示出能极其高效地从水中去除有毒金属，其选择性顺序为Pb(II) > Zn(II) > Cu(II) > Cd(II)。在最佳pH值和浓度下，吸附速度极快，5分钟内Pb(II)的去除量为93 mg/g，仅20分钟后Pb(II)的最大吸附量就达到110 mg/g。吸附等温线与朗缪尔模型吻合良好，表明为单层吸附，而动力学与伪二级模型相符，表明为化学吸附结合机制。吸附热力学符合吸热且自发的过程。这种材料至少可循环使用五个周期，因此有望用于清理受有毒金属污染的水，尤其是铅污染的水。

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