Nickel ferrite nanocomposites (NFNCs) were prepared and utilized to remove hexavalent chromium from the effluent of the electroplating industry. The nickel ferrite nanoparticles (NFNPs) were synthesized by the sol-gel auto combustion process, and they were doped ultrasonically onto the surface-modified multi-walled carbon nanotubes (SM-MWCNTs). Characterization results confirmed that the NFNPs with a cubic spinel structure were successfully impregnated onto the SM-MWCNTs. The synthesized NFNCs were tubular structures with an outer diameter in the range of 30–40 nm and had high crystal defect. The NFNCs with the surface area of 210.5 m² g⁻¹ offer high magnetic separability due to their paramagnetic behavior. Non-linear kinetic, thermodynamic, and isotherm models were used for interpretations, and high Cr(VI) uptake of 129.83 mg/g was obtained at 40°C. The Cr(VI) uptake by NFNCs was dominated by electrostatic attractions at a low pH and ion exchange mechanism at a higher pH. Lastly, high efficient recyclability of the NFNCs and applicability in removing other heavy metals from electroplating effluent suggested them to be a promising material in wastewater treatment.

制备了镍铁氧体纳米复合材料（NFNC），并将其用于从电镀工业废水中去除六价铬。通过溶胶-凝胶自燃烧过程合成了镍铁氧体纳米粒子（NFNPs），并将它们超声掺杂到表面改性的多壁碳纳米管（SM-MWCNTs）上。表征结果证实，具有立方尖晶石结构的NFNP已成功地浸渍到SM-MWCNT上。合成的NFNC为管状结构，外径范围为30–40 nm，且晶体缺陷较高。表面积为210.5 m ² g ^-1的NFNC由于其顺磁特性，具有很高的磁分离性。非线性动力学，热力学和等温线模型用于解释，在40℃时获得129.83 mg / g的高Cr（VI）吸收℃。NFNCs对Cr（VI）的吸收主要由低pH值下的静电引力和较高pH值下的离子交换机制决定。最后，NFNCs的高效可回收性以及从电镀废水中去除其他重金属的适用性表明它们是废水处理中很有希望的材料。