Department of Chemistry, The Islamia University of Bahawalpur, 63100 Bahawalpur, Pakistan; Institute of Chemistry, University of Punjab, 54590 Lahore, Pakistan.
Int J Biol Macromol. 2013 Mar;54:99-108. doi: 10.1016/j.ijbiomac.2012.11.010. Epub 2012 Dec 5.
In this research work, the potential of a novel green material obtained from Saccharum bengalense (SB) plant was investigated for the removal of Ni (II) ions from aqueous solution. Biomaterial SB composed of cellulose macromolecules and was used without any chemical treatment. Batch experiments were performed by considering the effect of contact time, SB concentration, pH of the solution and temperature. Results revealed that ∼87% of Ni was removed from aqueous solution at optimum conditions. Three typical kinetic models namely, pseudo first order, pseudo second order and Elovich equations were applied to interpret the kinetic data. To investigate the rate determining step, the intra-particle diffusion model was applied on the experimental data. The sorption process was well explained with pseudo second-order kinetic model. Adsorption isothermal data was examined by applying classical two parameters (Langmuir, Freundlich, Timken and Dubinin-Radushkevich) and three parameters (Redlich-Peterson, Toth and Sips models) and four parameters Fritz Schlunder Isotherm models. Based on R(2) and χ(2) the equilibrium sorption data was better fitted to Langmuir and Sips isotherm model than any other model. Thermodynamics parameters such as free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) have been calculated respectively, which revealed the spontaneous, endothermic and feasible nature of adsorption process. The results of the present investigation suggest that S. bengalense can be used as an environmentally benign and low cost biomaterial for nickel removal from aqueous solution.
在这项研究工作中，研究了从甜高粱（SB）植物中获得的新型绿色材料去除水溶液中 Ni（II）离子的潜力。生物质 SB 由纤维素大分子组成，未经任何化学处理即可使用。通过考虑接触时间、SB 浓度、溶液 pH 值和温度的影响进行了批量实验。结果表明，在最佳条件下，约 87%的 Ni 从水溶液中被去除。应用了三种典型的动力学模型，即拟一级、拟二级和 Elovich 方程，来解释动力学数据。为了研究速率决定步骤，将内扩散模型应用于实验数据。吸附过程很好地用拟二级动力学模型解释。通过应用经典的两个参数（朗缪尔、弗伦德利希、蒂姆肯和杜宾-拉什科夫斯基）和三个参数（里德利-彼得森、托特和西普斯模型）以及四个参数弗里茨-施伦德尔等温线模型来检验吸附等温线数据。根据 R(2)和 χ(2)，平衡吸附数据更符合朗缪尔和 Sips 等温线模型，而不是任何其他模型。自由能变化 (ΔG°)、焓变 (ΔH°) 和熵变 (ΔS°) 等热力学参数分别进行了计算，这表明吸附过程是自发的、吸热的和可行的。本研究结果表明，甜高粱可以作为一种环境友好和低成本的生物材料，用于从水溶液中去除镍。
