Departamento Académico de Química, Universidad Peruana Cayetano Heredia, Av. Honorio Delgado, 430 Urbanización Ingeniería, Lima 31, Peru.
Appl Biochem Biotechnol. 2010 Oct;162(3):805-22. doi: 10.1007/s12010-010-8912-5. Epub 2010 Feb 14.
Lessonia nigrescens and Lessonia trabeculata kelps have been tested for the sorption of mercury from aqueous solutions. A pretreatment (using CaCl(2)) allowed stabilizing the biomass that was very efficient for removing Hg(II) at pH 6-7. Sorption isotherms were described by the Langmuir equation with sorption capacities close to 240-270 mg Hg g(-1) at pH 6. The temperature had a negligible effect on the distribution of the metal at equilibrium. The presence of chloride anions had a more marked limiting impact than sulfate and nitrate anions. The uptake kinetics were modeled using the pseudo-second-order equation that fitted better experimental data than the pseudo-first-order equation. The particle size hardly influenced sorption isotherms and uptake kinetics, indicating that sorption occurs in the whole mass of the biosorbent and that intraparticle mass transfer resistance was not the limiting rate. Varying the sorbent dosage and the initial metal concentration influenced the equilibrium, but the kinetic parameters were not drastically modified. Metal can be eluted with hydrochloric acid, citric acid, or acidic KI solutions.
黑藻和泡叶藻已被测试用于从水溶液中吸附汞。预处理（使用 CaCl(2)）可以稳定生物质，在 pH 值为 6-7 时对去除 Hg(II)非常有效。吸附等温线符合朗缪尔方程，在 pH 值为 6 时吸附容量接近 240-270mg Hg g(-1)。温度对平衡时金属的分布影响可以忽略不计。氯离子的存在比对硫酸根和硝酸根离子的限制作用更为显著。采用准二级动力学方程对吸附动力学进行了拟合，该方程比准一级动力学方程更能拟合实验数据。颗粒大小几乎不影响吸附等温线和吸附动力学，表明吸附发生在整个生物吸附剂的质量上，并且颗粒内传质阻力不是限速步骤。改变吸附剂用量和初始金属浓度会影响平衡，但动力学参数不会发生很大变化。金属可以用盐酸、柠檬酸或酸性 KI 溶液洗脱。
