Al系多元LDHs复合材料的制备及其对刚果红吸附性能研究

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关键词：Al系；LDHs；水热法；吸附；离子交换

中图分类号：TQ424；X703 文献标志码：A 文章编号：1003-5168（2025）24-0089-09

DOI： 10.19968/j.cnki.hnkj.1003-5168.2025.24.016

Preparation of Al-based Multi-component LDHs Composites and Studyon TheirAdsorptionPerformanceforCongo Red

CUI Jialong1 WANG Shuxia1.2.3 CUI Jiehu1ZHAO Ping1LIANG Bo1 HE Jiajun1 CAI Jialin’YU Zhanjun’CHEN Hongwu4 （1.School of Materials，Zhengzhou UniversityofAeronauticsand Industry Management，Zhengzhou 45oooo，China; 2.LAN Shen Group Co.，LTD.，Nanjing 21150O， China; 3.School of Materials Science and Engineering， Zhengzhou University， Zhengzhou 45oooo， China; 4.Luoyang Zhongchao New Materials Co.，Ltd.，Luoyang 4710oo， China）

Abstract：[Purposes] To prepare aluminum-based layered double metal hydroxides （LDHs） via hydrothermal forsynthesis，characterize their structures and morphologies，and investigate theiradsorption performanceandinfluencing factors for Congo red.[Methods] Three LDHs with diferent compositions （Cu-Al-LDHs，Al-MgNi-LDHs，and Cu-Al-Mg-Ni-LDHs） were synthesized using copper nitrate， aluminum nitrate， magnesium nitrate，nickel nitrate，and triethanolamine as raw materials.Characterization was performed through XRD， SEM，and FTIR.Adsorption performance was evaluated by adjusting the initial Congo red concentration，adsorption time， temperature，pH，and adsorbent dosage. [Findings] The maximum adsorption capacities were 568.1 mg/g， 656.4 mg/g，and 1245.9 mg/g for the three materials，respectively. Adsorption kinetics fitting results showed that the adsorption processes of allthree materials followed the pseudo-second-order kinetic model;the adsorption isotherms better conformed to the Langmuir isothermal adsorption model; the adsorption process was spontaneous and endothermic.After three cycles，the removal rates remained above 60 % ， with the main adsorption mechanism being ion exchange.[Conclusions] The prepared Cu-Al-LDHs，AlMg-Ni-LDHs，and Cu-Al-Mg-Ni-LDHs conformed to the pseudo-second-order kinetic model and the Langmuir isotherm model for Congo red adsorption. The process was spontaneous and endothermic，primarily governed by ion exchange，and the materials maintained a removal rate above 60% over three cycles of use. Keywords： Al-based; LDHs; hydrothermal method; adsorption; ion exchange

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