Study of the structure guide mechanism of solid phase synthesis of CAN zeolite from coal gasification slag and its fixation of the Cr6+ structure in wastewater

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2024-11-12 DOI:10.1016/j.micromeso.2024.113410

Mei Yang , Yu Li , Xiaohui Shi , Ning Fen , Lu Ma , Wenxin Ji , Yi Xiao , Keren Shi , Yonggang Sun , Yuanyuan Li , Yulong Ma

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Abstract

The generation of a large amount of coal gasification coarse slag (CGCS) restricts the sustainable development of the modern coal chemical industry. This paper uses CGCS as raw material, adopts a solid phase synthesis method, saves water resources, is a new method of synthesizing zeolite with low secondary pollution. Different types of anions were used to induce the synthesis of zeolites. Using XRD, FT-IR, ²⁷Al-NMR, ²⁹Si-NMR, BET, SEM, and experimental research methods, the activation and depolymerization of CGCS in the solid phase reaction and the guiding role of anions in crystal growth were studied. The results revealed that the anionic structure with triple rotational axis symmetry can induce the synthesis of single-phase CAN zeolite. Using this rule, CAN zeolite was synthesized using CGCS as raw material and Cr⁶⁺ containing wastewater with triple rotation axis symmetry as the structural guide agent, and Cr⁶⁺ in wastewater was structurally fixed. Compared to the adsorption effect of CGCS on Cr⁶⁺, the results showed that the synthesized CAN zeolite was found to effectively fix Cr⁶⁺ (74.98 mg/g) from wastewater, which was much higher than that of CGCS (24.85 mg/g).

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煤气化炉渣固相合成 CAN 沸石的结构引导机理及其固定废水中 Cr6+ 结构的研究

大量煤气化粗渣（CGCS）的产生制约了现代煤化工的可持续发展。本文以煤气化粗渣为原料，采用固相合成法，节约水资源，是一种低二次污染的沸石合成新方法。采用不同类型的阴离子诱导合成沸石。利用 XRD、FT-IR、27Al-NMR、29Si-NMR、BET、SEM 和实验研究方法，研究了 CGCS 在固相反应中的活化和解聚以及阴离子对晶体生长的引导作用。结果表明，具有三重旋转轴对称性的阴离子结构可诱导合成单相 CAN 沸石。利用这一规律，以 CGCS 为原料，以具有三重旋转轴对称性的含 Cr6+ 废水为结构引导剂，合成了 CAN 沸石，并对废水中的 Cr6+ 进行了结构固定。结果表明，与 CGCS 对 Cr6+ 的吸附效果相比，合成的 CAN 沸石能有效固定废水中的 Cr6+（74.98 mg/g），远高于 CGCS（24.85 mg/g）。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.