Reaction Kinetics, Mechanisms and Catalysis ( IF 1.7 ) Pub Date : 2021-09-11 , DOI: 10.1007/s11144-021-02061-1 Meriem Kouhail 1, 2 , Zakia El Ahmadi 1 , Abbes Benayada 1
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The study provides the physical and chemical properties of the synthesized photocatalysts, and the doping ion influence on the photocatalytic reactions degradation of two textile dyes (direct dye DY86, and reactive dye RBY) under sun irradiation. ZnO nanoparticles doped with alkaline earth metals (Calcium), and transition metals (Silver and Iron) were prepared by a precipitation method. The nanoparticles were characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray, UV–Visible spectrophotometry, and Fourier-transform infrared spectroscopy. The results show that the properties of doped ZnO were strongly influenced by the nature of dopant. This study shows that the photocatalytic activity of zinc oxide was improved by the doped treatment, the order for the catalyst photocatalytic activities is: ZnO/Fe > ZnO/Ag > ZnO/Ca > ZnO. ZnO doped with transition metal, revealed the highest photodegradation efficiency compared to alkaline earth metals. The dye’s removal efficiency by nanoparticles of ZnO doped with Fe, Ag, and Ca is about 95%, 85%, and 81%.
Graphic abstract
中文翻译：
Ag、Ca和Fe对ZnO纳米颗粒在阳光照射下去除纺织染料的光催化活性的影响
该研究提供了合成光催化剂的物理和化学性质，以及掺杂离子对两种纺织染料（直接染料 DY86 和活性染料 RBY）在阳光照射下的光催化反应降解的影响。通过沉淀法制备掺杂有碱土金属（钙）和过渡金属（银和铁）的氧化锌纳米颗粒。使用 X 射线衍射、扫描电子显微镜、能量色散 X 射线、紫外-可见分光光度法和傅里叶变换红外光谱对纳米颗粒进行表征。结果表明，掺杂ZnO的性质受掺杂剂性质的影响很大。本研究表明掺杂处理提高了氧化锌的光催化活性，催化剂光催化活性顺序为：ZnO/Fe > ZnO/Ag > ZnO/Ca > ZnO。与碱土金属相比，掺杂过渡金属的 ZnO 显示出最高的光降解效率。掺杂 Fe、Ag 和 Ca 的 ZnO 纳米粒子对染料的去除效率约为 95%、85% 和 81%。
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