International Journal of Environmental Research ( IF 2.6 ) Pub Date : 2021-08-12 , DOI: 10.1007/s41742-021-00362-w Munmun Banerjee 1, 2 , Nirjhar Bar 1, 3 , Sudip Kumar Das 1
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Continuous adsorptive removal of copper ions by a walnut shell was reported. The walnut shell was characterized by BET analysis, point of zero charge (pHpzc) estimation, FTIR spectroscopy, and SEM. Behaviors of Cu(II) ion adsorption against different conditions like influent flow rate, depth of the adsorbent bed, and influent Cu(II) concentration were studied. The Langmuir and Freundlich isotherms were applied, and Langmuir was found to be the best. The variation of the operating variables was investigated, pH 5.8, influent Cu(II) concentration (10–20 mg/L), bed height (5–10 cm), the flow rate (10—20 ml/min). The suitability of the different kinetic models was tested. The Thomas kinetic model fits the experimental data well compared to other models; hence it was used for the scale-up design. The 0.4 N HCl solution was found as the optimum regenerant, and regeneration after the 4th cycle was quite significant. Designing plant scale-up and its economic feasibility proved that walnut shells could be suitable for Cu(II) ions adsorption from effluent water. Multilinear regression (MLR) analysis and GA-NN predicted the percentage removal successfully.
Graphic abstract
中文翻译：
使用核桃壳从水溶液中去除 Cu(II)：吸附研究、再生研究、工厂放大设计、经济可行性、统计和 GA-ANN 建模
据报道，核桃壳连续吸附去除铜离子。核桃壳通过 BET 分析表征，零电荷点 (pH pzc) 估计、FTIR 光谱和 SEM。研究了 Cu(II) 离子在进水流速、吸附床深度和进水 Cu(II) 浓度等不同条件下的吸附行为。应用了 Langmuir 和 Freundlich 等温线，发现 Langmuir 是最好的。研究了操作变量的变化，pH 5.8，进水铜（II）浓度（10-20 毫克/升），床高（5-10 厘米），流速（10-20 毫升/分钟）。测试了不同动力学模型的适用性。与其他模型相比，Thomas 动力学模型很好地拟合了实验数据；因此它被用于放大设计。发现 0.4 N HCl 溶液为最佳再生剂，第 4次后再生周期相当显着。设计工厂放大及其经济可行性证明，核桃壳可适用于从废水中吸附 Cu(II) 离子。多元线性回归 (MLR) 分析和 GA-NN 成功预测了去除百分比。
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