Meseguer Víctor F, Ortuño Juan F, Aguilar M Isabel, Pinzón-Bedoya Martha L, Lloréns Mercedes, Sáez José, Pérez-Marín Ana B
Departamento de Ingeniería Química, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30071, Murcia, Spain.
Departamento de Ingeniería Civil y Ambiental, Facultad de Ingenierías y Arquitectura, Universidad de Pamplona, Pamplona, Colombia.
Environ Sci Pollut Res Int. 2016 Dec;23(23):24032-24046. doi: 10.1007/s11356-016-7625-x. Epub 2016 Sep 16.
Natural, HCl-treated, and formaldehyde-treated non-living leaves of Posidonia oceanica, a marine plant, were investigated as potential biosorbents to remove Cd from aqueous solutions. The studied biosorbents were characterized by elemental analysis and Fourier transform infrared spectroscopy (FTIR) and it was observed that the adsorption capacity of the biosorbents strongly depended on the pH, increasing as the pH rises. The adsorption process was fast. The adsorption kinetic was analyzed using five kinetic models: pseudo-first order, pseudo-second order, Elovich, intraparticle diffusion, and Bangham models. The adsorption isotherms were analyzed by the Langmuir, Freundlich, Dubinin-Radushkevich, Sips, Redlich-Peterson, and Toth models. The maximum biosorption capacity was attained by the biosorbent treated with HCl (1.11 mmol g). The distribution equilibrium constant and the Gibbs free energy change were calculated. The effects of the presence of Na, K, Mg, and Ca ions in the solution on Cd uptake were studied. Results indicate that non-living leaves of P. oceanica, natural or treated, can be considered as effective and low-cost biosorbents for the removal of cadmium from aqueous solutions.
对海洋植物波喜荡草的天然、经盐酸处理和经甲醛处理的非活体叶片作为从水溶液中去除镉的潜在生物吸附剂进行了研究。通过元素分析和傅里叶变换红外光谱（FTIR）对所研究的生物吸附剂进行了表征，并且观察到生物吸附剂的吸附容量强烈依赖于pH值，随着pH值升高而增加。吸附过程很快。使用五种动力学模型分析吸附动力学：伪一级、伪二级、埃洛维奇、颗粒内扩散和班汉姆模型。通过朗缪尔、弗伦德利希、杜宾宁-拉杜舍维奇、西普斯、雷德利希-彼得森和托特模型分析吸附等温线。经盐酸处理的生物吸附剂达到了最大生物吸附容量（1.11 mmol g）。计算了分布平衡常数和吉布斯自由能变化。研究了溶液中Na、K、Mg和Ca离子的存在对镉吸收的影响。结果表明，波喜荡草的天然或处理过的非活体叶片可被视为从水溶液中去除镉的有效且低成本的生物吸附剂。
