Department of Biotechnology, National Institute of Technology-Durgapur, Mahatma Gandhi Avenue, Durgapur (WB)-713209, India.
Colloids Surf B Biointerfaces. 2011 Jun 1;84(2):520-7. doi: 10.1016/j.colsurfb.2011.02.009. Epub 2011 Feb 23.
Biosorption characteristics of Ananas comosus (pineapple) leaf powder was investigated for decolorization of Basic Green 4 (BG 4), a cationic dye from its aqueous solutions employing a batch experimental set-up. Parameters that influence the sorption process such as pH, biosorbent dosage, contact time, initial dye concentration and temperature were systematically studied. The optimum conditions for removal of BG 4 were found to be pH 9.0, contact time=150 min, biosorbent dosage=5.0 g L(-1), initial dye concentration=50 mg L(-1). The temperature had a strong influence on the biosorption process. Further, the biosorbent was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and Brunauer, Emmett, Teller (BET) surface area and pore size analysis. Experimental biosorption data were modeled by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms. The biosorption process followed the Langmuir isotherm model with high coefficients of correlation (R(2)>0.99) at different temperatures. The pseudo second order kinetic model fitted well in correlation to the experimental results. Activation energy of the biosorption process (E(a)) was found to be 45.79 kJ mol(-1) by using the Arrhenius equation, indicating chemisorption nature of BG 4 sorption onto pineapple leaf powder. Thermodynamic parameters suggest that the biosorption process is spontaneous and exothermic in nature. Overall, the present findings suggest that this environmentally friendly, efficient and low-cost biosorbent may be useful for the removal of BG 4 from aqueous media.
菠萝叶粉对碱性绿 4（BG 4）的吸附特性研究及其在水溶液中的脱色作用。采用批量实验装置，系统研究了影响吸附过程的参数，如 pH 值、生物吸附剂用量、接触时间、初始染料浓度和温度等。发现去除 BG 4 的最佳条件为 pH 值 9.0、接触时间=150 min、生物吸附剂用量=5.0 g L(-1)、初始染料浓度=50 mg L(-1)。温度对生物吸附过程有很强的影响。此外，还通过傅里叶变换红外（FTIR）光谱、扫描电子显微镜（SEM）和 Brunauer、Emmett、Teller（BET）表面积和孔径分析对生物吸附剂进行了表征。实验吸附数据采用 Langmuir、Freundlich 和 Dubinin-Radushkevich（D-R）等温线进行了模型化。在不同温度下，吸附过程符合 Langmuir 等温线模型，相关系数（R(2)>0.99）较高。准二级动力学模型与实验结果拟合较好。通过 Arrhenius 方程计算得到吸附过程的活化能（E(a)）为 45.79 kJ mol(-1)，表明 BG 4 吸附到菠萝叶粉上是化学吸附的性质。热力学参数表明，吸附过程是自发的和放热的。总的来说，这些发现表明，这种环保、高效、低成本的生物吸附剂可能对从水介质中去除 BG 4 有用。
