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以七水硫酸锌、氢氧化钠为原料,采用室温一步固相反应合成ZnO纳米粒子,并分别利用X射线衍射分析(XRD)、傅里叶变换红外光谱分析(FTIR)、热重分析(TG)、扫描电子显微分析(SEM)、透射电子显微分析(TEM)、N2吸附-脱附、紫外可见漫反射光谱分析(UV-Vis DRS)等方法对ZnO纳米粒子进行表征。实验结果表明:不需任何添加剂,室温下可通过一步固相反应合成ZnO纳米粒子,其形成过程首先是Zn SO4·7H_2O和NaOH充分接触,然后反应形成Zn4SO4(OH)6·5H_2O,最后NaOH的溶解热可使Zn4SO4(OH)6·5H_2O转变为ZnO并逐渐长大形成纳米粒子。同时以甲基橙为降解对象评价了ZnO纳米粒子的光催化活性,实验结果表明:紫外光照射下,该方法合成的ZnO纳米粒子对甲基橙具有较好的光催化活性,且光催化动力学方程符合准一级反应动力学。
ZnO nanoparticles were synthesized by one-step solid-state reaction at room temperature using zinc sulfate heptahydrate and sodium hydroxide as raw materials. The structure of ZnO nanoparticles was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) ), Scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, UV-Vis DRS and other methods were used to characterize the ZnO nanoparticles. The experimental results show that ZnO nanoparticles can be synthesized by one-step solid-state reaction without any additives at room temperature. The formation process of Zn nanoparticles is that Zn SO 4 · 7H 2 O is fully contacted with NaOH and then reacted to form Zn 4 SO 4 (OH) 6 · 5H 2 O. Dissolved heat can make Zn4SO4 (OH) 6 · 5H_2O convert to ZnO and grow up to form nano-particles. At the same time, the photocatalytic activity of ZnO nanoparticles was evaluated using degradation of methyl orange. The experimental results show that the ZnO nanoparticles prepared by this method have good photocatalytic activity for methyl orange under ultraviolet light irradiation, and the photocatalytic activity The equation of learning is in accordance with quasi-first order reaction kinetics.