Biosorption of Methylene Blue from Aqueous Solution Using Lawny Grass Modified with Citric Acid

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• 作者：Lihua Chen ; Anas Ramadan ; Lili Lu虉 ; Wenjing Shao ; Fang Luo ; Ji Chen
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：August 11, 2011
• 年：2011
• 卷：56
• 期：8
• 页码：3392-3399
• 全文大小：932K
• 年卷期：v.56,no.8(August 11, 2011)
• ISSN：1520-5134

文摘

Using the low cost of lawny grass to remove methylene blue (MB) from aqueous solution was evaluated in the batch process and the fixed-bed column. The MB adsorption capacity onto CG (grass modified with citric acid) was 301.1 mg路g^鈥? biomass, which was almost three times than that of RG (raw grass). The equilibrium could be explained as pseudofirst-order kinetic processes, and equilibrium time was shortened to 20 min (CG) from 40 min (RG). The adsorption equilibrium followed the Langmuir isotherm model. The desorption rate with 0.1 mol路L^鈥? HCl was almost 90 %. Regenerated CG was reusable with a little decrease (only about 3.38 %) in its adsorption capacity during six repeated cycles. In the fixed-bed column, the breakthrough point of CG begins at 183 BV, which was much higher than that of RG (56 BV). The elution process was achieved in a very small HCl volume.