MgAlNi-BaFe ternary layered hydroxide (UMLDH) and its calcined (CMLDH) form were synthesized and tested as adsorbents for methyl orange dye (MO) uptake from water. The adsorptive performances of the new magnetic nanocomposites were modeled, evaluated and optimized via response surface methodology (RSM). The UMLDH and CMLDH maximum removal efficiency and adsorption capacities data were fitted into RSM models with insignificant lack of fit (p-values<0.05) and high R2=0.991–0.997. The UMLDH and CMLDH MO adsorption capacities increased with decrease in both pH and initial MO concentration and decreased when the temperature was increased. Under optimal operating conditions, pseudo-second-order described kinetics of MO sorption on the nanocomposites, while the Freundlich isotherm gave the best fits for both the two adsorbents. The MO uptake simultaneously incorporated both mono and multi-layer surface adsorption involving strong electrostatic attraction and chemical interactions between MO and the adsorbents surface functional groups. Respectively, the obtained maximum Langmuir theoretical sorption capacity of 715.44 and 708 mg/g, indicated profoundly improved MO sorption capacities compared with many other magnetic-LDHs. These results demonstrate the potential of MgAlNi-BaFe as excellent adsorbents for effective remediation of dyes wastewater effluents.

中文翻译：

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评价新型 Mg/Al/Ni-BaFe 三元层状氢氧化物从水中吸收甲基橙染料

合成了 MgAlNi-BaFe 三元层状氢氧化物 (UMLDH) 及其煅烧 (CMLDH) 形式，并测试其作为从水中吸收甲基橙染料 (MO) 的吸附剂。通过响应面方法 (RSM) 对新型磁性纳米复合材料的吸附性能进行建模、评估和优化。UMLDH 和 CMLDH 最大去除效率和吸附容量数据拟合到 RSM 模型中，拟合不明显（p 值 <0.05）和高 R2 = 0.991-0.997。UMLDH 和 CMLDH MO 吸附能力随着 pH 值和初始 MO 浓度的降低而增加，并随着温度的升高而降低。在最佳操作条件下，准二级描述了纳米复合材料上 MO 吸附的动力学，而 Freundlich 等温线对两种吸附剂都给出了最佳拟合。MO 吸收同时包含单层和多层表面吸附，涉及 MO 与吸附剂表面官能团之间的强静电吸引力和化学相互作用。分别获得的最大朗缪尔理论吸附容量为 715.44 和 708 mg/g，表明与许多其他磁性 LDH 相比，MO 吸附容量得到了显着提高。这些结果证明了 MgAlNi-BaFe 作为有效修复染料废水的优良吸附剂的潜力。表明与许多其他磁性 LDH 相比，MO 吸附能力有了显着提高。这些结果证明了 MgAlNi-BaFe 作为有效修复染料废水的优良吸附剂的潜力。表明与许多其他磁性 LDH 相比，MO 吸附能力有了显着提高。这些结果证明了 MgAlNi-BaFe 作为有效修复染料废水的优良吸附剂的潜力。