Department of Chemistry, Bishop Moore College, Alappuzha 690110, India.
Ecotoxicol Environ Saf. 2013 Dec;98:352-60. doi: 10.1016/j.ecoenv.2013.09.003. Epub 2013 Oct 3.
Present study explored the biosorption capacity of xanthated nano banana cellulose (XNBC) for Cd(II) from aqueous solution. The biosorbent containing sulfur-bearing groups have a high affinity for heavy metals. Sulfur can be considered as a soft ligand group having strong affinity for cadmium. In the present study, the influence of various important parameters such as pH, time, biosorbent dose and initial Cd(II) concentration on the biosorption capacity were investigated. The maximum biosorption capacity of XNBC for Cd(II) was found to be 154.26 mg g⁻¹ at 298 K. The Cd(II) sorption of XNBC was confirmed by SEM-EDS and XRF analysis. The isotherms such as Langmuir, Freundlich, Redlich-Peterson and Tempkin were studied. The Langmuir and the Redlich-Peterson isotherms had been well fitted the biosorption of Cd(II) with xanthated nano banana cellulose. The kinetics of Cd(II) removal using XNBC was well explained by second-order kinetic model. The thermodynamic parameters were also evaluated from the biosorption measurements. Among the various desorbing agents tested, the desorbing efficiency was found to be maximum with 0.1 mol L⁻¹ HCl. It was found that XNBC is also suitable to be used under column operation.
本研究探讨了巯基化纳米香蕉纤维素（XNBC）对水溶液中 Cd(II)的吸附能力。含硫基团的生物吸附剂对重金属具有高亲和力。硫可以被认为是一种软配体基团，对镉具有很强的亲和力。在本研究中，考察了 pH 值、时间、生物吸附剂用量和初始 Cd(II)浓度等各种重要参数对吸附能力的影响。在 298 K 时，XNBC 对 Cd(II)的最大吸附容量为 154.26mg/g。通过 SEM-EDS 和 XRF 分析证实了 XNBC 对 Cd(II)的吸附。研究了等温线，如朗缪尔、弗伦德利希、Redlich-Peterson 和 Tempkin 等温线。Langmuir 和 Redlich-Peterson 等温线很好地拟合了 XNBC 对 Cd(II)的吸附。XNBC 去除 Cd(II)的动力学很好地解释了二级动力学模型。还从吸附测量中评估了热力学参数。在所测试的各种解吸剂中，发现 0.1mol/L HCl 的解吸效率最高。研究还发现 XNBC 也适用于柱操作。
