Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI, CCT La Plata-CONICET, UNLP, Facultad de Ciencias Exactas, 50 y 115, 1900 La Plata, Argentina.
Bioresour Technol. 2012 Jul;116:195-203. doi: 10.1016/j.biortech.2012.04.014. Epub 2012 Apr 17.
Zinc and cadmium can be efficiently removed from solutions using the brown algae, Macrocystis pyrifera. Treatment with CaCl(2) allowed stabilization of the biosorbent. The maximum biosorption capacities in mono-component systems were 0.91 mmol g(-1) and 0.89 mmol g(-1) and the Langmuir affinity coefficients were 1.76 L mmol(-1) and 1.25 L mmol(-1) for Zn(II) and Cd(II), respectively. In two-component systems, Zn(II) and Cd(II) adsorption capacities were reduced by 50% and 40%, respectively and the biosorbent showed a preference for Cd(II) over Zn(II). HNO(3) (0.1M) and EDTA (0.1M) achieved 90-100% desorption of both ions from the loaded biomass. While HNO(3) preserved the biomass structure, EDTA destroyed it completely. Fourier transform infrared spectra identified the contribution of carboxylic, amine and sulfonate groups on Zn(II) and Cd(II) biosorption. These results showed that biosorption using M. pyrifera-treated biomass could be an affordable and simple process for cadmium and zinc removal from wastewaters.
使用大型褐藻巨藻可以有效地从溶液中去除锌和镉。用 CaCl(2)处理可以稳定生物吸附剂。在单一组分体系中，最大的生物吸附容量分别为 0.91 mmol g(-1)和 0.89 mmol g(-1)，Zn(II)和 Cd(II)的 Langmuir 亲和力系数分别为 1.76 L mmol(-1)和 1.25 L mmol(-1)。在双组分体系中，Zn(II)和 Cd(II)的吸附容量分别降低了 50%和 40%，并且生物吸附剂对 Cd(II)的偏好超过了 Zn(II)。0.1M 的 HNO(3)和 0.1M 的 EDTA 可以从负载的生物质中实现对两种离子的 90-100%解吸。虽然 HNO(3)保留了生物质的结构，但 EDTA 却完全破坏了它。傅里叶变换红外光谱确定了羧酸、胺和磺酸盐基团对 Zn(II)和 Cd(II)生物吸附的贡献。这些结果表明，使用经过 M. pyrifera 处理的生物质进行生物吸附可能是一种经济实惠且简单的从废水中去除镉和锌的方法。
