In the present study, the experimental design method was used to optimize the preparation conditions of an activated carbon from prickly pear seed cake by phosphoric acid activation. The parameters studied include impregnation ratio, carbonization temperature, and carbonization time. The optimal conditions for the preparation of the activated carbon with high adsorption capacity for methylene blue were identified to be an impregnation ratio of 2.9, carbonization temperature of 541°C, and carbonization time of 88 min. The obtained activated carbon was characterized by SEM/EDX, FTIR, pH_pzc, and its capacity to adsorb methylene blue. FTIR analysis and pH_PZC showed the acidic character of the activated carbon surface. The adsorption capacity of the optimal activated carbon was found to be 260 mg·g⁻¹ for methylene blue. The adsorption equilibrium of methylene blue was well explained by the pseudo-second-order model and Freundlich isotherm. Furthermore, the performance of the produced activated carbon was examined by the methyl orange removal.

中文翻译：

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刺梨饼的活性炭：实验设计优化制备条件及其在染料去除中的应用

在本研究中，实验设计方法被用来优化由刺梨种子饼通过磷酸活化的活性炭的制备条件。研究的参数包括浸渍率，碳化温度和碳化时间。确定了对亚甲基蓝具有高吸附能力的活性炭的最佳制备条件是：浸渍比为2.9，碳化温度为541°C，碳化时间为88分钟。所获得的活性炭通过SEM / EDX，FTIR，pH _pzc以及其吸附亚甲基蓝的能力进行表征。FTIR分析和pH _PZC显示出活性炭表面的酸性特征。发现最佳活性炭对亚甲基蓝的吸附容量为260mg·g ^-1。拟二阶模型和弗氏等温线很好地解释了亚甲基蓝的吸附平衡。此外，通过除去甲基橙检查了所生产的活性炭的性能。