Polydopamine-encapsulated diatomite composites loaded with ZIF-8 for efficient adsorption of anionic dyes and nanoplastics from water

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2025-06-14 DOI:10.1016/j.poly.2025.117642

Kai Xu , Tairan Pang , Ming Zhang , Mingrui Zhang , Wentai Zhao , Zicheng Chen

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引用次数: 0

Abstract

The composite of natural minerals with MOFs represents a promising strategy for developing novel and efficient adsorbents in water pollution treatment. In this study, polydopamine was coated on diatomite (D/P), and then Zeolitic Imidazolate Framework-8 (ZIF-8) was loaded on D/P by a facile one-step solvothermal method to prepare multi-functional composite materials (D/P/Z). Finally, the adsorption properties of D/P/Z on anionic pollutants such as methyl orange dye (MO) and nano polystyrene (NPS) plastics were investigated. The results showed that under favorable conditions, the adsorption rates of MO and NPS by D/P/Z4 reached 98.82 % and 91.53 % respectively within 5 min. Meanwhile, D/P/Z4 exhibited excellent recyclability, maintaining an adsorption rate of MO higher than 50 % even after 10 cycles. Electrostatic interaction was the key factor contributing to the high adsorption capacity of D/P/Z4. Moreover, the incorporation of polydopamine not only enhanced the stability and uniformity of ZIF-8 loading on the diatomite surface but also further improved the adsorption capacity of the adsorbent. This study provides a new way to fabricate a composite based on diatomite and a rapid and efficient solution for adsorbing anionic pollutants such as MO and NPS in water.

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负载ZIF-8的聚多巴胺包封硅藻土复合材料对水中阴离子染料和纳米塑料的高效吸附

天然矿物与MOFs复合是开发新型高效吸附剂的有效途径。本研究将聚多巴胺包被在硅藻土（D/P）上，然后采用简单的一步溶剂热法将沸石咪唑酸框架-8 （ZIF-8）负载在D/P上，制备多功能复合材料（D/P/Z）。最后，研究了D/P/Z对甲基橙染料（MO）和纳米聚苯乙烯（NPS）塑料等阴离子污染物的吸附性能。结果表明，在良好的条件下，D/P/Z4在5 min内对MO和NPS的吸附率分别达到98.82%和91.53%，同时，D/P/Z4具有良好的可回收性，即使在10次循环后，对MO的吸附率仍保持在50%以上。静电相互作用是D/P/Z4具有高吸附能力的关键因素。此外，聚多巴胺的掺入不仅增强了ZIF-8在硅藻土表面负载的稳定性和均匀性，而且进一步提高了吸附剂的吸附能力。本研究为硅藻土复合材料的制备提供了一条新途径，为吸附水中MO、NPS等阴离子污染物提供了一种快速、高效的解决方案。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.