School of Chemical Engineering, University of Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas, São Paulo, 13083-852, Brazil.
Institute of Physics Gleb Wataghin, University of Campinas (UNICAMP), Cidade Universitária Zeferino Vaz, Campinas,, São Paulo, Brazil.
Environ Sci Pollut Res Int. 2019 Oct;26(28):28470-28480. doi: 10.1007/s11356-018-2880-7. Epub 2018 Aug 8.
The alginate extraction residue (RES) from the Brazilian Sargassum filipendula was successfully employed as biosorbent in this binary equilibrium study, revealing a greater affinity and selectivity for Cr(III) than for Zn(II). Experimental results also revealed that the process is of endothermic nature and well adjusted by Langmuir-Freundlich binary model. The X-ray photoelectron spectroscopy (XPS) analysis revealed that coordination with hydroxyl groups of RES prevailed in Cr removal, followed by carboxyl-metal complexation. As far as Zn(II) is concerned, ion exchange with carboxylate groups of RES was the largest contributor. Nevertheless, scanning electron microscopy coupled with Fourier transform infrared spectroscopy indicated the participation of sulfate functions in a minor degree.
从巴西马尾藻中提取的褐藻胶提取残渣（RES）成功地用作二元平衡研究中的生物吸附剂，表明其对 Cr(III)的亲和力和选择性大于 Zn(II)。实验结果还表明，该过程是吸热的，并且很好地符合 Langmuir-Freundlich 二元模型。X 射线光电子能谱（XPS）分析表明，在去除 Cr 时，RES 上的羟基与 Cr 配位占主导地位，随后是羧基与金属的络合。就 Zn(II)而言，与 RES 上的羧酸盐基团进行离子交换是最大的贡献者。然而，扫描电子显微镜结合傅里叶变换红外光谱表明硫酸根功能的参与程度较小。
