Department of Chemistry, Faculty of Arts and Sciences, Dokuz Eylul University, Izmir, Turkey.
Mar Biotechnol (NY). 2010 Nov;12(6):728-36. doi: 10.1007/s10126-010-9260-8. Epub 2010 Mar 30.
Posidonia oceanica (Linnaeus) Delile is an endemic species in the Mediterranean Sea. In the present study, dead leaves of P. oceanica (L.) which are accumulated on the beach seasonally were used as an alternative low cost biosorbent to remove methyl violet (MV) from aqueous solution. In order to explain the adsorption kinetics, pseudo first-order and pseudo second-order kinetic models were investigated. It was obtained that the pseudo second-order model was well in line with our experimental results. Equilibrium data were analyzed according to Langmuir, Freundlich, and Dubinin-Radushkevich equations. Langmuir isotherm model corresponded well with equilibrium data than the others, and the maximum adsorption capacity of the biomass was found to be 119.05 mg g⁻¹ at 45°C. Thermodynamic parameters, ΔG°, ΔH°, and ΔS°, were calculated according to van't Hoff equation. Negative values of Gibbs free energy imply that the process is spontaneous. Consequently, dried biomass of this species can be an alternative and low cost material for the removal of MV from wastewaters. Moreover, since the remarkable adsorption capacity of these dead leaves compared to other low cost adsorbents has been observed, this beach waste could provide an economic contribution to the countries in the Mediterranean region.
地中海特有种海洋波喜荡草（Posidonia oceanica）（Linnaeus）Delile。本研究中，海洋波喜荡草（L.）的季节性积累在海滩上的枯树叶被用作替代的低成本生物吸附剂，从水溶液中去除甲基紫（MV）。为了解释吸附动力学，研究了伪一级和伪二级动力学模型。结果表明，伪二级模型与我们的实验结果非常吻合。根据朗缪尔（Langmuir）、弗伦德利希（Freundlich）和杜宾宁-拉什科夫斯基（Dubinin-Radushkevich）方程分析平衡数据。与其他模型相比，Langmuir 等温模型更符合平衡数据，并且在 45°C 下生物质的最大吸附容量为 119.05mg/g。根据范特霍夫（van't Hoff）方程计算热力学参数ΔG°、ΔH°和ΔS°。吉布斯自由能的负值表明该过程是自发的。因此，这种物种的干燥生物质可以作为从废水中去除 MV 的替代和低成本材料。此外，由于与其他低成本吸附剂相比，这些枯树叶具有显著的吸附能力，因此这种海滩废物可以为地中海地区的国家提供经济贡献。
