Preparation of unsaturated MIL-101(Cr) with Lewis acid sites for the extraordinary adsorption of anionic dyes

IF 11.4 1区工程技术 Q1 ENGINEERING, CHEMICAL npj Clean Water Pub Date : 2025-02-26 DOI:10.1038/s41545-024-00413-7

Basem E. Keshta, Haojie Yu, Li Wang, Hong Yi, Shan Jian, MD Alim Uddin, Chenguang Ouyang, Yu Wang, Xunchun Yuan, Yanhui Zhang, Yang Jin, Abdul Basit, Muhammad Owais Malik, Khan Manqoosh Awan

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Abstract

Anionic dyes contaminate water and severely disrupt aquatic ecosystems, urgently demanding effective treatment solutions for safety. This study explores the synthesis of unsaturated MIL-101(Cr) and its exceptional performance in removing anionic dyes from polluted water systems. The synthesized MIL-101(Cr) exhibits medium Lewis’s acid and strong Brønsted acid sites, a high specific surface area (>3000 m²/g), and a Zeta potential of 30 mV, contributing to its strong adsorption capability. Adsorption studies reveal Langmuir isotherm model fitting, with maximum adsorption capacities of 4231, 1266, and 568 mg/g for Acid Blue 92, Congo Red, and Acid Blue 90, respectively. The chemisorption process follows pseudo-second-order kinetics and is spontaneous and exothermic. MIL-101(Cr) demonstrates chemical and water stability, maintaining over 80% removal efficiency after five recycling cycles. This research provides valuable insights into treating anionic dye-contaminated wastewater using MIL-101(Cr) as an efficient adsorbent.

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具有路易斯酸位的不饱和MIL-101（Cr）的制备及其对阴离子染料的特殊吸附

阴离子染料污染水体，严重破坏水生生态系统，迫切需要有效的安全处理方案。本研究探讨了不饱和MIL-101（Cr）的合成及其在污水系统中去除阴离子染料的优异性能。合成的MIL-101（Cr）具有中等Lewis 's酸和强Brønsted酸位，具有较高的比表面积（>3000 m2/g）和30 mV的Zeta电位，具有较强的吸附能力。对酸蓝92、刚果红和酸蓝90的最大吸附量分别为4231、1266和568 mg/g。化学吸附过程遵循准二级动力学，是自发和放热的。MIL-101（Cr）表现出化学和水稳定性，在5次循环后保持80%以上的去除效率。本研究为MIL-101（Cr）作为高效吸附剂处理阴离子染料污染废水提供了有价值的见解。

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文献相关原料

公司名称

产品信息

麦克林

Rhodamine B

麦克林

Congo red

麦克林

Acid Blue 90

阿拉丁

Dichloromethane

阿拉丁

Sodium hydroxide

阿拉丁

Dimethyl formamide

阿拉丁

Sodium chloride

阿拉丁

Terephthalic acid

阿拉丁

Chromium nitrate nonahydrate

来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.