Self-assembly of Cucurbit[6]uril-Silicotungstic acid and adsorption properties for cationic dyes

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Solid State Sciences Pub Date : 2024-11-17 DOI:10.1016/j.solidstatesciences.2024.107760

Liling Zeng, Xianyan Ao, Manli Xu, Yunqian Zhang, Zhu Tao

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Abstract

The development of environmentally friendly adsorbents with low cost and high selectivity is often more able to meet the needs of practical applications. In this study, a novel adsorbent Q[6]-STA capable of rapidly and effectively adsorbing cationic dyes was prepared by self-assembly of cucurbit[6]uril (Q[6]) and silicotungstic acid (STA). Q[6]-STA assembly has good thermal stability and significantly improved specific surface area and porosity. The adsorption capacities of Q[6]-STA for crystal violet (CV), malachite green (MG) and methylene blue (MB) are 475.59, 351.98 and 238.16 mg/g, respectively. The efficient adsorption performance for cation dyes is attributed to the high electronegativity of Q[6]-STA surface. This also makes the adsorbent exhibit high selectivity for cationic dyes in anionic/cationic mixed dyes. Thermodynamic analysis shows that the adsorption procedure of Q[6]-STA is unprompted and endothermal. Electrostatic interaction and π-π conjugation effect are possible adsorption driving forces. In the regeneration experiment, the adsorbent is easy to be separated and desorbed, can be recycled, and has good stability.

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葫芦[6]脲-硅钨酸的自组装及其对阳离子染料的吸附特性

开发低成本、高选择性的环保型吸附剂往往更能满足实际应用的需要。本研究通过葫芦[6]脲（Q[6]）和硅钨酸（STA）的自组装制备了一种能够快速有效吸附阳离子染料的新型吸附剂 Q[6]-STA。Q[6]-STA 组装具有良好的热稳定性，比表面积和孔隙率显著提高。Q[6]-STA 对结晶紫（CV）、孔雀石绿（MG）和亚甲基蓝（MB）的吸附容量分别为 475.59、351.98 和 238.16 mg/g。阳离子染料的高效吸附性能得益于 Q[6]-STA 表面的高电负性。这也使得该吸附剂对阴离子/阳离子混合染料中的阳离子染料具有较高的选择性。热力学分析表明，Q[6]-STA 的吸附过程是非催化和内热的。静电作用和 π-π 共轭效应是可能的吸附驱动力。在再生实验中，吸附剂易于分离和解吸，可以循环使用，稳定性好。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.