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Acid-vacuo heat treated low cost banana stems fiber for efficient biosorption of Hg(II)

机译:酸真空热处理低成本香蕉茎纤维,可有效吸附汞(II)

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摘要

The potential of banana stem fiber (BSF) as a low cost biosorbent for Hg(II) removal was studied. HCl treatment increased the cellulose accessibility which led to an enhanced interaction of Hg(II) and BSF. Activation of BSF-HCl in vacuo at 373 K increased the maximum biosorption capacity from 28 to 372 mg g(-1) and altered the activation energy from 3.5 to 76.9 kJ mol(-1) showing an increase in Hg(II) chemisorption. FTIR and ESR results confirmed the large amount of structural defects on the activated BSF-HCl which led to the increase in Hg(II) uptake. Batch biosorption models showed that the kinetics follow pseudo-second-order and the equilibrium uptake fitted to all three-parameter models showing the Hg(II) biosorption behaves as a Langmuir isotherm. The non-linear regression method exhibited higher coefficient of determination values for isotherm and kinetic analyses compared to the linear method. The thermodynamic functions indicated that the nature of Hg(II) biosorption is an exothermic and non-spontaneous process.
机译:研究了香蕉茎纤维(BSF)作为低成本生物吸附剂去除Hg(II)的潜力。 HCl处理增加了纤维素的可及性,导致Hg(II)与BSF的相互作用增强。在373 K的真空中BSF-HCl的活化将最大生物吸附容量从28增加到372 mg g(-1),并将活化能从3.5改变为76.9 kJ mol(-1),显示Hg(II)的化学吸附增加。 FTIR和ESR结果证实活化的BSF-HCl上存在大量结构缺陷,从而导致Hg(II)吸收增加。批处理生物吸附模型显示动力学遵循伪二级,并且对所有三参数模型拟合的平衡吸收显示Hg(II)生物吸附表现为Langmuir等温线。与线性方法相比,非线性回归方法在等温线和动力学分析中显示出更高的确定值系数。热力学函数表明,汞(II)生物吸附的性质是放热和非自发过程。

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