Tecnológico Nacional de México/ TES de Tianguistenco, Km. 22, Carretera Tenango - La Marquesa Santiago Tilapa, Santiago Tianguistenco 52650, México E-mail:
Universidad Autónoma del Estado de México, (UAEMex), Centro Conjunto de Investigación en Química Sustentable (CCIQS) UAEM-UNAM, Carretera Toluca-Atlacomulco, Km 14.5, Toluca, MEX 50200, México.
Water Sci Technol. 2023 Sep;88(6):1547-1563. doi: 10.2166/wst.2023.285.
This study reports on a novel composite of bimetallic FeO/ZnO nanoparticles supported by spent coffee grounds (SCGs). The leaves of eucalyptus (Eucalyptus globulus Labill) and trumpet (Cuphea aequipetala Cav), with their high antioxidant content, serve as bio-reductant agents for the green synthesis of nanoparticles. It was characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Stable nanoparticles were produced with different diameters of 5-30 nm, and they were applied as catalysts in Fenton-like processes. Box-Behnken experimental design (BBD) was used to determine the optimal removal efficiency with three factors and was used in the degradation of textile dyes from wastewater. The nanocomposite displayed a high decolorization ratio (88%) of indigo carmine in the presence of HO combined. This resulted in a reduction in chemical oxygen demand (COD) of 56% at 120 min of contact time at an initial pH of 3.0 and a 0.5 g/L of catalyst dose, a HO concentration of 8.8 mM/L, an initial dye concentration of 100 mg/L, and a temperature of 25 °C.
本研究报告了一种新型的负载在废咖啡渣（SCG）上的双金属 FeO/ZnO 纳米粒子复合材料。具有高抗氧化含量的桉树（Eucalyptus globulus Labill）和喇叭花（Cuphea aequipetala Cav）叶子作为纳米粒子的绿色合成的生物还原剂。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能谱（EDS）、X 射线衍射（XRD）和透射电子显微镜（TEM）对其进行了表征。生成了具有不同直径 5-30nm 的稳定纳米粒子，并将其作为类 Fenton 过程中的催化剂。采用 Box-Behnken 实验设计（BBD）确定了三个因素的最佳去除效率，并用于从废水中降解纺织染料。在 HO 自由基存在下，纳米复合材料显示出较高的靛蓝胭脂红脱色率（88%）。这导致在接触时间为 120 分钟、初始 pH 值为 3.0、催化剂剂量为 0.5g/L、HO 浓度为 8.8mM/L、初始染料浓度为 100mg/L 和温度为 25°C 的条件下，化学需氧量（COD）降低了 56%。
