Factorial Design Methodological Approach for Enhanced Cadmium Ions Bioremoval by Opuntia Biomass

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• 作者：Marta Rosique ; José ; M. Angosto ; Eric Guibal ; Marí ; a J. Roca and José ; A. Ferná ; ndez-Ló ; pez
• 刊名：CLEAN 胠SOIL, AIR, WATER
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：44
• 期：8
• 页码：959-966
• 全文大小：1591K
• ISSN：1863-0669

文摘

The bioremoval efficiency of Opuntia biomass, a low-cost biosorbent and renewable resource, for cadmium ions from aqueous solutions was investigated using factorial design methodology. The functional groups involved in the sorption process were identified by FTIR spectroscopy. A factorial experimental design technique, the full factorial design 3³, has been used for enhanced cadmium ions bioremoval. Three factors were considered: protonation of the sorbent, initial cadmium concentration, and sorbent dosage at three markedly different levels. An empirical model was statistically developed using response surface methodology for its optimization. The model showed that cadmium ions bioremoval in aqueous solution was affected by all the three factors analyzed. The statistical model revealed a maximum sorption capacity (q_e) of 58.4 mg/g with sorbent protonated with 0.67 M HCl, initial Cd(II) concentration of 50 mg/L, and 0.55 g/L of sorbent dosage. Bioremoval kinetic data were properly fitted by chemical sorption of pseudo-second order. The Langmuir equation fits better the sorption isotherm (equilibrium data) than other classical models.