Abstract This work was aimed at optimizing the adsorbent mass and contact time and evaluating the performance of two-stage batch adsorber of NaOH-activated coconut shell carbon for methylene blue removal. To decrease the dye concentration from 1000 to 89.4 mg/L at any effluent volumes, the two-stage adsorber displays a small mass saving of 0.33% because of the high adsorbent affinity towards methylene blue at 1.80 L/mg. Meanwhile, the contact time can be minimized by 97.6% as opposed to that in one-stage adsorber. The sensitivity analysis of affinity on mass minimization shows a significant saving of 28.5% when the affinity is reduced to 0.01 L/mg. The response surface methodology was used to optimize the two-stage absorber for methylene blue removal, wherein the most significant parameter is the contact time.

中文翻译：

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优化 NaOH 活化椰壳炭两级吸附器去除亚甲基蓝

摘要 本工作旨在优化吸附剂质量和接触时间，并评估 NaOH 活化椰壳炭两级间歇吸附器去除亚甲基蓝的性能。为了在任何流出液体积下将染料浓度从 1000 降低到 89.4 mg/L，由于 1.80 L/mg 对亚甲基蓝的高吸附剂亲和力，两级吸附器显示出 0.33% 的少量质量节省。同时，与一级吸附器相比，接触时间可减少 97.6%。亲和力对质量最小化的敏感性分析表明，当亲和力降低到 0.01 L/mg 时，可显着节省 28.5%。响应面法用于优化去除亚甲蓝的两级吸收器，其中最重要的参数是接触时间。