Department of Civil Engineering, Shiv Nadar Institution of Eminence Deemed to be University, Delhi-NCR, Greater Noida, Uttar Pradesh, 201314, India.
Environ Monit Assess. 2023 Apr 20;195(5):591. doi: 10.1007/s10661-023-11177-x.
Nanoparticles of zinc ferrite (ZnFeO) and copper ferrite (CuFeO) were synthesized, and characterized, and these materials were applied for removal of organic dyes of alizarin yellow R (AYR), thiazole yellow G (TYG), Congo red (CR), and methyl orange (MO) from industrial wastewater through adsorption technique. Synthesis of ZnFeO and CuFeO was achieved through chemical co-precipitation method. These nanomaterials were characterized for physicochemical properties using XRD, FTIR, BET, VSM, DLS, Zeta-potential, and FESEM-EDX analytical instruments. BET surface areas of ZnFeO and CuFeO were 85.88 m/g and 41.81 m/g, respectively. Adsorption-influencing parameters including effect of solution pH, adsorbent quantity, initial concentration of dye pollutant, and contact time were examined. Acidic medium of the solution favored higher percentage of removal of dyes in wastewater. Out of different isotherms, Langmuir equilibrium isotherm showed the best fit with experimental data, indicating monolayer adsorption in the treatment process. The maximum monolayer adsorption capacities were found as 54.58, 37.01, 29.81, and 26.83 mg/g with ZnFeO, and 46.38, 30.06, 21.94, and 20.83 mg/g with CuFeO for AYR, TYG, CR, and MO dyes, respectively. From kinetics analysis of the results, it was inferred that pseudo-second-order kinetics were fitting well with better values of coefficient of determination (R). The removal of four organic dyes from wastewater through adsorption technique using nanoparticles of ZnFeO and CuFeO was observed to be spontaneous and exothermic. From this experimental investigation, it has been inferred that magnetically separable ZnFeO and CuFeO could be a viable option in removal of organic dyes from industrial wastewater.
锌铁氧体 (ZnFeO) 和铜铁氧体 (CuFeO) 的纳米粒子被合成并进行了表征，这些材料被应用于通过吸附技术从工业废水中去除偶氮染料茜素黄 R (AYR)、噻唑黄 G (TYG)、刚果红 (CR) 和甲基橙 (MO)。ZnFeO 和 CuFeO 的合成采用化学共沉淀法。这些纳米材料的物理化学性质通过 XRD、FTIR、BET、VSM、DLS、Zeta-电位和 FESEM-EDX 分析仪器进行了表征。ZnFeO 和 CuFeO 的 BET 表面积分别为 85.88 m²/g 和 41.81 m²/g。考察了吸附影响参数，包括溶液 pH 值、吸附剂用量、染料污染物初始浓度和接触时间。溶液的酸性介质有利于废水中染料的去除率提高。在不同的等温线中，Langmuir 平衡等温线与实验数据拟合最好，表明在处理过程中存在单层吸附。使用 ZnFeO，最大单层吸附容量分别为 54.58、37.01、29.81 和 26.83 mg/g，对于 AYR、TYG、CR 和 MO 染料，使用 CuFeO 的最大单层吸附容量分别为 46.38、30.06、21.94 和 20.83 mg/g。从结果的动力学分析来看，准二级动力学模型拟合得很好，具有更好的决定系数 (R) 值。通过使用 ZnFeO 和 CuFeO 的纳米粒子通过吸附技术从废水中去除四种有机染料，观察到吸附是自发和放热的。通过这项实验研究，可以推断出磁性可分离的 ZnFeO 和 CuFeO 可能是从工业废水中去除有机染料的可行选择。
