A green deposition method of zinc oxide nanoparticles using coffee leaf extraction was successfully prepared. The use of these preparation techniques is accepted by many researchers because it is nonexpensive and simple and has no environmental impact during the operation. The determination and reduction of Zn ions to ZnO NPs were characterized by using a UV-visible spectroscope. The UV-visible spectroscopy result reveals that the large band gap energy is observed in the visible region at the wavelength of 300 nm. X-ray diffraction and SEM analysis confirm that the deposited nanoparticle is highly crystalline with (111), (222), and (100) planes and cubic shape structure. The coffee leaf extraction serves as a reducing agent for stability of the particle length, where its medicinal value outcome showed an important antibacteria of the pathogenic type which appeared on the wound. The present research deals with the green synthesis of ZnO NPs as well as its application in toxicity reduction.

中文翻译：

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使用咖啡（小粒咖啡）水叶提取物的氧化锌 (ZnO) 纳米颗粒的绿色合成和表征及其在降低环境毒性中的应用

成功制备了一种利用咖啡叶提取法制备氧化锌纳米颗粒的绿色沉积方法。这些制备技术的使用被许多研究人员接受，因为它不贵、简单，并且在操作过程中对环境没有影响。Zn 离子的测定和还原为 ZnO NPs 的特点是使用紫外-可见光谱仪。紫外-可见光谱结果表明，在可见光区在 300 nm 波长处观察到大带隙能量。X 射线衍射和 SEM 分析证实沉积的纳米颗粒是高度结晶的，具有 (111)、(222) 和 (100) 平面和立方体形状结构。咖啡叶提取物作为颗粒长度稳定性的还原剂，其药用价值结果显示了伤口上出现的致病类型的重要抗菌素。目前的研究涉及 ZnO NPs 的绿色合成及其在降低毒性中的应用。