Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
J Colloid Interface Sci. 2010 Feb 15;342(2):533-9. doi: 10.1016/j.jcis.2009.10.074. Epub 2009 Oct 31.
Oedogonium hatei was developed into an effective and efficient adsorbent for the removal of Ni(II) ions from aqueous solution. The adsorption studies of untreated and treated algal biomass (with 0.1M HCl) were compared in batch mode. Optimum biosorption conditions were determined as a function of pH, biomass dosage, contact time, and temperature and the Langmuir and Freundlich isotherms were found applicable in terms of relatively high regression values. The maximum monolayer adsorption capacity of the biosorbents (untreated and acid-treated algae), as obtained from the Langmuir adsorption isotherm, was found to be 40.9 and 44.2mg/g, respectively at 80min contact time, 5.0 pH, 0.7g/L algal dose, and 298K temperature. The thermodynamic parameters showed that the adsorption of Ni(II) ions onto algal biomass was feasible, spontaneous, and exothermic under the studied conditions. Kinetics of adsorption followed both first- and second-order rate equations and the process involving the rate-controlling step is complex involving boundary layer as well as intraparticle diffusion processes. The FTIR results of algal biomass showed that biomass has different functional groups and these functional groups are able to react with metal ion in aqueous solution. Biosorbent could be regenerated using 0.1M NaOH solution, with up to 70% recovery. The performance of this biosorbent was then compared with many other reported biosorbents for nickel removal and it was observed that the proposed adsorbent is effective in terms of its performance.
水绵被开发成为一种从水溶液中去除 Ni(II)离子的有效且高效的吸附剂。以间歇模式比较了未处理和处理过的藻类生物质（用 0.1M HCl）的吸附研究。根据 pH 值、生物质剂量、接触时间和温度确定最佳生物吸附条件，并且发现 Langmuir 和 Freundlich 等温线适用于相对较高的回归值。从 Langmuir 吸附等温线获得的生物吸附剂（未处理和酸处理的藻类）的最大单层吸附容量，在 80min 接触时间、5.0 pH、0.7g/L 藻类剂量和 298K 温度下，分别为 40.9 和 44.2mg/g。热力学参数表明，在研究条件下，Ni(II)离子吸附到藻类生物质上是可行的、自发的和放热的。吸附动力学遵循一级和二级速率方程，涉及速率控制步骤的过程是复杂的，涉及边界层和颗粒内扩散过程。藻类生物质的 FTIR 结果表明，生物质具有不同的官能团，这些官能团能够与水溶液中的金属离子发生反应。可以使用 0.1M NaOH 溶液再生生物吸附剂，回收率高达 70%。然后将这种生物吸附剂的性能与许多其他报道的用于去除镍的生物吸附剂进行比较，结果表明，在性能方面，所提出的吸附剂是有效的。
