The simultaneous removal of Indigo Carmine(IC) and Methyl Orange(MO) in binary mixtures by cobalt hydroxide nanoparticles in batch system is investigated. Taguchi optimization approach (an L₁₆ orthogonal array design) was employed for estimating the important and interactive impressions of some considered variables (such as, initial concentrations of Indigo Carmine and Methyl Orange, amount of sorbent, initial pH value, and contact time) on the adsorption process. Under the optimized conditions, the maximum removal percent (%R) was equal with 75% and 87% and also the uptake capacity was obtained to be 62.5 and 81.3 mg/g for Indigo Carmine and Methyl Orange dyes, respectively. Isotherm modeling and kinetic studies indicated that modified Langmuir and pseudo-second-order are good models for illustrating the adsorption equilibrium and kinetic behavior of process. Thermodynamic parameters proved that the adsorption process was endothermic (∆H° > 0) for MO while it was exothermic (∆H° < 0) for IC. Finally, the morphology and structure of the nanosorbent was characterized by using XRD, EDX, SEM, FTIR and TEM techniques.

研究了氢氧化钴纳米颗粒在间歇体系中同时去除二元混合物中的靛蓝胭脂红（IC）和甲基橙（MO）。田口优化方法（L ₁₆正交阵列设计）用于估计在吸附过程中一些考虑变量（例如，靛蓝胭脂红和甲基橙的初始浓度，吸附剂的量，初始pH值和接触时间）的重要和相互作用的印象。在优化的条件下，最大去除率（％R）等于75％和87％，并且靛蓝胭脂红和甲基橙染料的吸收容量分别为62.5和81.3 mg / g。等温线模型和动力学研究表明，改进的Langmuir模型和拟二级模型是说明过程的吸附平衡和动力学行为的良好模型。热力学参数表明，MO的吸附过程是吸热的（∆H °> 0），而MO的吸附过程是放热的（∆H对于IC，°<0）。最后，利用XRD，EDX，SEM，FTIR和TEM技术对纳米吸附剂的形貌和结构进行了表征。