Polymerization regenerating Ca-zeolite by calcium inducing halloysite for enhancing toxic metal ions removal

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2023-10-01 DOI:10.1016/j.clay.2023.107088

Wenchao Niu , Luwei Jin , Pingxiao Wu , Chenhui Liu , Zhi Dang , Nengwu Zhu

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引用次数: 0

Abstract

Traditional techniques can be problematic due to secondary pollution while natural clay aroused great concern. For example, halloysite has high structural activity and excellent potential in toxic metals removal. The polymerization of halloysite to form Ca-zeolite with better metal-binding performance is of great significance for the immobilization of toxic metals. However, halloysite lacks exchangeable cations, which may restrict its polymerization conversion. Thus, it is efficacious to induce halloysite's structural recombination and speciation when calcium is introduced into the polymerization. The curly multilayer halloysite tubes in-situ unfolded and formed kelp-like Ca-zeolite by using calcium as a structure-directing agent. When the calcium content increased, the cubic zeolite was broken into pieces. The pore size distribution showed that micropores and mesoporous structure of halloysite disappeared and converted zeolite hierarchical shape. The characterization analysis indicated that new toxic metal compound groups were generated, confirming the lattice exchange of Ca and toxic metal ions in the Ca-zeolite. Otherwise, the lattice fringe showed that Pb was mainly immobilized on the 001 plane via ion exchange, while Cd formed inner complexes on the 110 plane. Above all, the halloysite-zeolite polymerization technology provides a new method for zeolite synthesis, which is significant for the control of toxic metal pollution in water.

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用钙诱导高岭土聚合再生钙沸石，增强对有毒金属离子的去除

传统技术由于二次污染而存在问题，而天然粘土则引起了人们的广泛关注。例如，高岭土具有较高的结构活性和去除有毒金属的优良潜力。高岭土聚合形成具有较好金属结合性能的钙分子筛，对固定化有毒金属具有重要意义。然而，高岭土缺乏可交换阳离子，这可能会限制其聚合转化。由此可见，在聚合过程中引入钙，可以有效地诱导高岭土的结构重组和形态形成。以钙为结构导向剂，将卷曲的多层高岭土管原位展开，形成海带状的钙分子筛。随着钙含量的增加，立方沸石破碎成碎片。孔隙大小分布表明，高岭土的微孔和介孔结构消失，转化为沸石的分层结构。表征分析表明，生成了新的有毒金属化合物基团，证实了Ca和有毒金属离子在Ca分子筛中的晶格交换。另外，晶格条纹显示Pb主要通过离子交换固定在001平面上，而Cd则在110平面上形成内配合物。综上所述，高岭土-沸石聚合技术为沸石合成提供了一种新的方法，对控制水中有毒金属污染具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...