酸性黄25插层水滑石薄膜的制备及其性能研究

采用原位生长法在铝片基底表面制备了ZnAl-NO3-LDHs水滑石薄膜,以其为前驱体,在弱酸性条件下通过离子交换反应将酸性黄25阴离子插层至ZnAl-LDHs/Al薄膜层间,制备了酸性黄25插层水滑石薄膜,并采用XRD、SEM、FTIR、TG-DTA、UV-Vis和色差计等手段对薄膜进行了表征。XRD和FTIR表征结果表明,酸性黄25阴离子成功地插层到了水滑石薄膜层间,ZnAl-LDHs的层间距由0.87 nm增加到2.96 nm,NO3-阴离子在1 384 cm-1处的特征吸收峰消失,同时出现了酸性黄25阴离子的特征吸收峰。SEM照片显示,水滑石晶片主要以c轴平行于铝片基底生长。TG-DTA分析、UV-Vis分析、色差分析和紫外光老化结果表明,插层后酸性黄25阴离子的耐热性和耐光性均得到了提高。

Synthesis and Properties of Acid Yellow 25 Dye-Intercalated Layered Double Hydroxides Film

A ZnAl-NO₃-LDHs film was fabricated on aluminum by in situ growth method. The Acid Yellow 25 ( p -5-hydroxy-3-methyl-4-3-(phenylsulfamoyl)-p-tolyl]azo]-pyrazol-1-yl] benzenesulfonic acid monosodium salt) (denoted as PTAB) anion intercalated LDHs/Al film was synthesized through ion-exchange method using the ZnAl-NO₃-LDHs/Al film as precursor. The prepared film was investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Thermogravimetric-differential thermal analysis (TG-DTA), UV-visible spectroscopy and automatic colorimeter. XRD patterns and FTIR spectra confirm the successful incorporation of PTAB anions into the interlayer galleries of ZnAl-LDHs with an expansion of d-spacing from 0.87 nm to 2.96 nm, the disappearance of characteristic absorption band of NO₃^- anions at 1 384 cm^-1 and the presence of the characteristic absorption of PTAB anions. The SEM morphologies show that the LDHs films are mainly oriented with the c axis of the platelet crystallites parallel to the substrate surface. The TG-DTA analysis, UV-Vis analysis, aberration analysis and photoaging results demonstrate that both the thermal stability and light fastness of PTAB are enhanced after intercalated into ZnAl-LDHs.