Use of Ponkan mandarin peels as biosorbent for toxic metals uptake from aqueous solutions

详细信息    查看全文

• 作者：Flá ; vio A. Pavan ; Ilauro S. Lima ; É ; der C. Lima ; Claudio Airoldi and Yoshitaka Gushikem
• 关键词：Biosorbent ; Ponkan mandarin peel ; Adsorption ; Toxic metals ; Aqueous solutions ; Batch ; Dynamic adsorption procedures
• 刊名：Journal of Hazardous Materials
• 出版年：2006
• 出版时间：1 September 2006
• 年：2006
• 卷：137
• 期：1
• 页码：527-533
• 全文大小：304 K

文摘

Waste Ponkan mandarin (Citrus reticulata) peel was used as biosorbent to extract Ni(II), Co(II) and Cu(II) from aqueous solutions at room temperature. To achieve the best adsorption conditions the influence of pH and contact time were investigated. The isotherms of adsorption were fitted to the Langmuir equation. Based on the capacity of adsorption of the natural biosorbent to interact with the metallic ions, the following results were obtained 1.92, 1.37 and 1.31 mmol g⁻¹ for Ni(II), Co(II) and Cu(II), respectively, reflecting a maximum adsorption order of Ni(II) > Co(II) > Cu(II). The quick adsorption process reached the equilibrium before 5, 10 and 15 min for Ni(II), Co(II) and Cu(II), respectively, with maximum adsorptions at pH 4.8. In order to evaluate the Ponkan mandarin peel a biosorbent in dynamic system, a glass column was fulfilled with 1.00 g of this natural adsorbent, and it was feed with 5.00 × 10⁻⁴ mol l⁻¹ of Ni(II) or Co(II) or Cu(II) at pH 4.8 and 3.5 ml min⁻¹. The lower breakpoints (BP₁) were attained at concentrations of effluent of the column attained the maximum limit allowed of these elements in waters (>0.1 mg l⁻¹) which were: 110, 100 and 130 bed volumes (V_effluent/V_adsorbent), for Ni(II), Co(II) and Cu(II), respectively. The higher breakpoints (BP₂) were attained when the complete saturation of the natural adsorbent occurred, and the values obtained were: 740, 540 and 520 bed volumes for Ni(II), Co(II) and Cu(II), respectively.