Phosphazene-based covalent organic framework: Advanced lead-capture material with visual indicator for efficient water purification

IF 7.7 Q2 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials advances Pub Date : 2025-02-01 Epub Date: 2025-01-03 DOI:10.1016/j.hazadv.2025.100593

Shaikha S. AlNeyadi

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Abstract

A nitrogen-phosphazene-based covalent organic framework (PT-COF) has been synthesized for the selective and efficient removal of lead (Pb²⁺) ions from contaminated water. Constructed through a solvothermal reaction between hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,5-tris-(4-aminophenyl)triazine, PT-COF exhibits a remarkable adsorption capacity of 940 mg/g, outperforming many conventional adsorbents. Adsorption equilibrium is achieved within just 20 min, highlighting its rapid kinetics. The material demonstrates exceptional selectivity for Pb²⁺ ions, even in the presence of competing contaminants, making it highly effective in complex water treatment scenarios. Moreover, PT-COF features a visual colorimetric indicator, transitioning from yellow to dark brown during Pb²⁺ ion adsorption, simplifying real-time monitoring. Its reusability was confirmed through five successful regeneration cycles without significant loss of efficiency, presenting PT-COF as a sustainable, cost-effective, and practical solution for industrial water purification and the mitigation of environmental lead pollution.

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基于磷腈的共价有机框架：先进的铅捕获材料，具有高效水净化的视觉指示器

合成了一种基于氮磷腈的共价有机框架（PT-COF），用于选择性、高效地去除污染水中的铅（Pb 2 +）离子。PT-COF通过六（4-甲酰基-苯氧基）环三磷腈和1,3,5-三（4-氨基苯基）三嗪的溶剂热反应构建而成，具有940 mg/g的吸附能力，优于许多传统吸附剂。吸附平衡仅在20分钟内实现，突出其快速动力学。该材料对Pb 2 +离子表现出优异的选择性，即使在存在竞争污染物的情况下也是如此，这使得它在复杂的水处理场景中非常有效。此外，PT-COF具有视觉比色指示器，在Pb 2 +离子吸附过程中从黄色变为深棕色，简化了实时监测。通过五次成功的再生循环，其可重复使用性得到了证实，而效率没有显著下降，这表明PT-COF是一种可持续的、具有成本效益的、实用的工业水净化和减轻环境铅污染的解决方案。

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