Afolabi Felicia O, Musonge Paul, Bakare Babatunde F
Institute of Systems Science, Durban University of Technology, Durban, South Africa.
Faculty of Engineering, Mangosuthu University of Technology, Umlazi, Durban, South Africa.
J Environ Health Sci Eng. 2021 Mar 8;19(1):613-624. doi: 10.1007/s40201-021-00632-x. eCollection 2021 Jun.
Banana peel was used as a low-cost adsorbent for the removal of Cu and Pb ions from aqueous solution in a binary system.
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).
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 (R) 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.
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.
The online version contains supplementary material available at 10.1007/s40201-021-00632-x.
将香蕉皮用作低成本吸附剂，用于从二元体系水溶液中去除铜离子和铅离子。
采用中心复合设计，以间歇模式研究初始浓度、pH值、吸附剂用量和粒径等操作参数的交互作用。利用零电荷点（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。
测定香蕉皮的零电荷点为4.83。FTIR、SEM和EDS分别显示了吸附过程前后的官能团、表面形态和元素组成。方差分析（ANOVA）表明，铜和铅的决定系数（R）拟合良好，分别为0.998和0.988。铜和铅的去除率随吸附剂用量的增加而提高，然而，铅的生物吸附容量大于铜。使用香蕉皮对铜和铅进行生物吸附的优化变量条件为：初始浓度100mg/L、pH值5、吸附剂用量1g、粒径75μm时，铅和铜的去除率分别为99.79%和88.94%。上述条件下的可取性为0.959，表明最佳条件是可接受的。
回归模型以及实验值与预测值之间的一致性证实了使用香蕉皮对铜和铅进行生物吸附的二阶多项式方程的有效性。
网络版包含可在10.1007/s40201-021-00632-x获取的补充材料。
