Department of Civil and Environmental Engineering, BIT, Mesra, Jharkhand 835215, India E-mail:
Water Sci Technol. 2020 Dec;82(11):2491-2502. doi: 10.2166/wst.2020.517.
In the present study, photo catalytic degradation of azo dye Congo Red was conducted using Fe nano particles (nZVI) in the presence of UV light. nZVI was biosynthesized using FeSO.7HO precursor and leaf extract of Shorea robusta (sal) as reducing agent under optimum condition of 1 mM concentration of precursor and a ratio of 1:1 Sal leaf extract to precursor. TEM and AFM images revealed formation of well dispersed spherical nano particles of 54-80 nm. SAED patterns of nZVI particles indicated its crystalline nature, while EDX result showed the presence of iron as the most abundant element. In batch experiments, optimum degradation of CR was 96% at 220 ppm CR with a dose of 1.2 g/L nZVI at pH 4 in 15 min following pseudo second order kinetics. The study suggested nZVI to be a potentially economic and ecofriendly technique for treatment of Congo Red.
在本研究中，使用 Fe 纳米粒子 (nZVI) 在紫外光存在下进行偶氮染料刚果红的光催化降解。nZVI 是使用 FeSO.7HO 前体和 Shorea robusta（萨尔）的叶提取物作为还原剂，在前体浓度为 1mM 和 Sal 叶提取物与前体比例为 1:1 的最佳条件下生物合成的。TEM 和 AFM 图像显示形成了分散良好的 54-80nm 球形纳米颗粒。nZVI 颗粒的 SAED 图案表明其具有晶体性质，而 EDX 结果表明铁是最丰富的元素。在批量实验中，在 pH 值为 4、15 分钟内，以 1.2g/L 的 nZVI 剂量处理 220ppm CR 时，CR 的最佳降解率为 96%，符合拟二级动力学。该研究表明，nZVI 是一种具有潜在经济性和环保性的刚果红处理技术。
