This study was performed to evaluate the removal from wastewater of reactive orange 16 (RO16) with magnetically separable zeolitic imidazole frameworks coated magnetic bentonite nanocomposites (ZIF-8@Fe₃O₄@BNT). Various microscopic and spectroscopic analyses were carried out to reveal the surface characteristics of the nanocomposite. Point of zero charging (pH_PZC) of ZIF-8@Fe₃O₄@BNT was obtained as 8.84. The dependence of RO16 removal yield on initial pH, initial dye concentration (C_o), adsorbent dose and contact time was investigated using the central composite design (CCD) included in response surface methodology (RSM). With the obtained quadratic model equation from CCD, the optimum values were determined as initial pH of 3.9, initial concentration (C_o) of 19.76 mg/L, adsorbent amount of 12 mg (480 mg/L), and contact time of 150 min. The maximum removal efficiency of 98.5% and the maximum adsorption capacity of 40.5 mg/g were reached at these optimal points. Adsorption kinetic analysis and equilibrium experiments showed that the best fit was reached with the pseudo-second-order and Langmuir isotherm models, respectively. Also, thermodynamic parameter changes for RO16 removal were calculated, and the results showed that the adsorption was favorable, spontaneous, and exothermic. With all of these, the fact that ZIF-8@Fe₃O₄@BNT has high recovery efficiency for RO16 removal, fast kinetics and can be separated easily and quickly with the help of a magnet before and after treatment provide significant advantages for wastewater treatment.

本研究旨在评估用磁性可分离沸石咪唑骨架涂覆的磁性膨润土纳米复合材料 (ZIF-8@Fe ₃ O ₄ @BNT)从废水中去除活性橙 16 ( RO16)。进行了各种显微和光谱分析以揭示纳米复合材料的表面特征。ZIF-8@Fe ₃ O ₄ @BNT的零充电点 (pH _PZC )为 8.84。RO16 去除率对初始 pH、初始染料浓度 (C _o)，使用响应面方法 (RSM) 中包含的中心复合设计 (CCD) 研究吸附剂剂量和接触时间。使用从 CCD 获得的二次模型方程，将最佳值确定为初始 pH 值为 3.9，初始浓度 (C _o) 为 19.76 mg/L，吸附剂量为 12 mg (480 mg/L)，接触时间为 150 分钟。在这些最佳点达到了 98.5% 的最大去除效率和 40.5 mg/g 的最大吸附容量。吸附动力学分析和平衡实验表明，分别用伪二级和朗缪尔等温线模型达到了最佳拟合。此外，还计算了 RO16 去除的热力学参数变化，结果表明吸附是有利的、自发的和放热的。综上所述，ZIF-8@Fe ₃ O ₄ @BNT 去除 RO16 的回收效率高，动力学快，并且在处理前后可以借助磁铁轻松快速地分离，这为废水处理提供了显着的优势治疗。