Chen Botong, Li Yanhui, He Yan, Zhang Jie, Wang Xinxin, Yin Lianwei, Du Qiuju, Pi Xinxin, Zhang Yinxiao, Li Yichen, Zhou Haitong
College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, China; State Key Laboratory of Bio-polysaccharide Fiber Forming and Eco-Textile, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
Int J Biol Macromol. 2025 May;305(Pt 1):141140. doi: 10.1016/j.ijbiomac.2025.141140. Epub 2025 Feb 15.
Dye pollution is a significant global environmental issue. To address this problem, various adsorbents have been employed, but traditional adsorbents often suffer from poor reusability and limited adsorption efficiency. Metal-organic frameworks (MOFs), which have emerged in recent years, have excellent physicochemical properties, but their application in wastewater treatment is limited by their polycrystalline, powdered state. In this paper, nitro functional groups were added to MIL-88B. The specific surface area of MIL-88B-NO obtained after the treatment was 660.98 m/g, which was enhanced by 80 % compared with MIL-88B, with more excellent physicochemical properties. Subsequently, MIL-88B-NO was combined with chitosan to form the MIL-88B-NO/CS aerogel, which addressed the problem of difficult separation of MOFs from water. The maximum adsorption amount of the aerogel for Congo Red (CR) was 878.8 mg/g. The adsorption process of CR by the adsorbent designed in this paper is consistent with the pseudo-second-order kinetic model and the Sips model, indicating that it is a complex physicochemical process. The adsorption mechanism is mainly synergistic with the effects of π-π conjugation, electrostatic attraction and hydrogen bonding. MIL-88B-NO/CS aerogel demonstrated excellent reusability, maintaining a CR removal rate of 80 % after five adsorption-desorption cycles, indicating its promising application in dye removal.
染料污染是一个重大的全球环境问题。为了解决这个问题，人们采用了各种吸附剂，但传统吸附剂往往存在可重复使用性差和吸附效率有限的问题。近年来出现的金属有机框架材料（MOFs）具有优异的物理化学性质，但其在废水处理中的应用受到其多晶、粉末状态的限制。本文在MIL-88B上引入了硝基官能团。处理后得到的MIL-88B-NO的比表面积为660.98 m²/g，比MIL-88B提高了80%，具有更优异的物理化学性质。随后，将MIL-88B-NO与壳聚糖复合形成MIL-88B-NO/CS气凝胶，解决了MOFs从水中分离困难的问题。该气凝胶对刚果红（CR）的最大吸附量为878.8 mg/g。本文设计的吸附剂对CR的吸附过程符合准二级动力学模型和Sips模型，表明这是一个复杂的物理化学过程。吸附机理主要是π-π共轭、静电吸引和氢键作用的协同效应。MIL-88B-NO/CS气凝胶表现出优异的可重复使用性，在五个吸附-解吸循环后仍保持80%的CR去除率，表明其在染料去除方面具有广阔的应用前景。
