交联法制备UiO-66-NH_(2)功能化棉纤维对活性蓝4的吸附性能研究  

Adsorption properties of UiO-66-NH_(2) functionalized cotton fiber prepared by cross-linking for Reactive Blue 4

作　　者：段兴宇 曲红梅[1] 董敏 张家财 孙一萍 李晓龙 DUAN Xingyu;QU Hongmei;DONG Min;ZHANG Jiacai;SUN Yiping;LI Xiaolong(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《化学工业与工程》2024年第4期97-108,共12页Chemical Industry and Engineering

摘　　要：以环氧氯丙烷(ECH)交联棉纤维(CF)和UiO-66-NH_(2),方便地制备了一种新型的富氨基金属有机骨架材料功能化棉纤维基复合材料(UCF),并应用于水溶液中活性蓝4(RB4)的高容量吸附。与通过水热合成在基质材料上生长MOFs的方法相比,交联法更加快速和简便。扫描电子显微镜(SEM)、X-射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)和热重分析(TGA)证实了UCF的合成。此外,进一步研究了吸附剂用量、pH值、温度、染料浓度和接触时间等因素对吸附性能的影响,探究了吸附等温线、动力学和热力学性质,并对吸附机理进行了分析和总结。结果表明:最适宜条件下,UCF的最大吸附量为539.2 mg·g^(-1),相比于原棉纤维增加了785.39%;吸附过程遵循Freundlich等温线模型和准二级动力学模型;吸附过程是自发放热的;静电相互作用是吸附过程中的主要推动力。为生物质-MOFs复合材料的制备提供了新思路,同时也显示了该复合材料在染料废水治理领域的应用潜力。A novel amino-rich metal-organic frameworks(MOFs)functionalized cotton fiber-based com-posite(UCF)was prepared conveniently by cross-linking cotton fiber(CF)and UiO-66-NH_(2) with epi-chlorohydrin(ECH)as the cross-linking agent,and was applied to the high-capacity adsorption of Reac-tive Blue 4(RB4)in aqueous solution.Compared with the method of growing MOFs on substrates via hydrothermal synthesis,cross-linking is faster and easier.Scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR)and thermogravimetric analysis(TGA)demonstrated the successful synthesis of UCF.In addition,the effects of adsorbent dosage,pH,temperature,dye concentration and contact time on the adsorption performance were further investigated,the adsorption isotherm,kinetic and thermodynamic properties were explored,and the adsorption mecha-nism was analyzed and summarized.The results showed that the maximum adsorption capacity of UCF was 539.2 mg·g^(-1) under the optimum conditions,which was 785.39%higher than that of raw cotton fi-ber;The adsorption process followed Freundlich isotherm model and pseudo-second-order kinetic model;The adsorption process was spontaneous and exothermic;Electrostatic interaction was the main driving force of the process.This study provides a simpler strategy for the preparation of biomass-MOFs compos-ites,and shows the application potential of this composite in the field of dye wastewater treatment.

关 键 词：染料废水 吸附 棉纤维 金属有机骨架 化学改性 

分 类 号：TQ041.8[化学工程] X703[环境科学与工程—环境工程]