对苯二甲酸辅助水热合成氧化锌及其光催化性能

摘要

Different ZnO nanoarchitectures were synthesized by a facile hydrothermal method using p?phthalic acid as a capping agent and structure-directing agent and NaOH as alkaline precursor during the synthesis.XRD confirmed that all the ZnO nanocrystals possess the hexagonal wurtzite structure.The PL spectra showed that all the samples have high density defects.With the increase of the p-phthalic acid concentration, the defect concentration firstly decreases, and then increases, indicating that the PL spectra can be changed and tuned by adjusting the concentration of p-phthalic acid.The FTIR spectra of ZnO nanostructures showed the main absorbance peak of all the samples is located at about 448 cm-1, which is attributed to the vibrations of elongation of ZnO.At the same time, the surface of the samples absorbs the trace amount of H2O molecules.The Eg values of ZnO are 3.163, 3.155, 3.171 and 3.076 eV respectively.The photocatalytic results showed that the photodegradation efficiency of ZnO for MB can reach 88.1％ under the irradiation of UV light when the Zn2+/p-PA mole ratio is 2:1.%以对苯二甲酸作为结构导向剂和帽剂、氢氧化钠为碱源采用水热法合成了不同花状的ZnO纳米颗粒.XRD测试结果表明所有的ZnO试样均为六方纤锌矿结构;光致发光光谱结果表明,所有的样品缺陷较高,随着对苯二甲酸浓度的增加,缺陷浓度先减小后增加,即可以通过改变对苯二甲酸的量来改变光谱吸收;红外光谱分析结果表明在448 cm-1处有一主要吸收峰可归因ZnO的特征吸收峰,同时样品表面吸收有少量水;氧化锌的禁带宽度值分别为3.163,3.155,3.171和3.076 eV;在紫外光下进行光催化降解亚甲基蓝实验,结果显示Zn2+:p-PA为2:1时,降解率可达88.1％.