Purpose

Banana peel was used as a low-cost adsorbent for the removal of Cu and Pb ions from aqueous solution in a binary system.

Methods

The interactive effects of the operating parameters such as initial concentration, pH, adsorbent dosage and particle size were studied in a batch mode using central composite design. The characterizations of banana peels were done using point of zero charge (pHpzc), Fourier infrared transform (FTIR), scanning electron microscopy (SEM) and elemental composition (EDS).

Result

The point of zero charge of banana peels was determined to be 4.83. The FTIR, SEM and EDS showed the functional groups, surface morphology and elemental composition respectively before and after the adsorption process. The analysis of variance (ANOVA) showed a good fit of coefficient of determination (R²) for Cu and Pb being 0.998 and 0.988 respectively. The percentage removal of Cu and Pb increased with increasing adsorbent dosage, however, the bio-sorption capacity of Pb was greater than Cu. The optimized variable conditions for the bio-sorption of Cu and Pb using banana peel gave 99.79% and 88.94% removal for Pb and Cu respectively with initial concentration of 100 mg/L, pH 5, adsorbent dosage of 1 g and particle size of 75 μm. The above condition gave desirability of 0.959, which denotes that the optimum conditions are acceptable.

Conclusion

The regression model and the agreement between the experimental and predicted values confirmed the validity of second-order polynomial equation for the bio-sorption of Cu and Pb using banana peels.

中文翻译：

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铜和铅离子双溶质体系在香蕉皮上的生物吸附：表征和优化

目的

香蕉皮被用作一种低成本吸附剂，用于在二元系统中从水溶液中去除 Cu 和 Pb 离子。

方法

使用中心复合设计以批处理模式研究了初始浓度、pH、吸附剂用量和粒径等操作参数的交互影响。使用零电荷点 (pHpzc)、傅里叶红外变换 (FTIR)、扫描电子显微镜 (SEM) 和元素组成 (EDS) 对香蕉皮进行表征。

结果

香蕉皮的零电荷点确定为 4.83。FTIR、SEM和EDS分别显示了吸附前后的官能团、表面形貌和元素组成。方差分析 (ANOVA) 表明决定系数 (R ²) 对于 Cu 和 Pb 分别为 0.998 和 0.988。Cu和Pb的去除率随着吸附剂用量的增加而增加，但Pb的生物吸附能力大于Cu。在初始浓度为 100 mg/L、pH 值为 5、吸附剂用量为 1 g、粒径为 75微米。上述条件给出了 0.959 的合意性，这表明最佳条件是可以接受的。

结论

回归模型以及实验值与预测值之间的一致性证实了二阶多项式方程对香蕉皮对铜和铅的生物吸附的有效性。