天然和氧化淀粉对水中镍、铁和锰离子的吸附

Rahma Boughanmi, Konstantin B. L. Borchert, Christine Steinbach, M. Mayer, S. Schwarz, Anastasiya Svirepa, J. Schwarz, M. Mertig, Dana Schwarz
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引用次数: 5

摘要

利用生态安全、可生物降解的生物聚合物吸附地表水中的重金属离子已成为一个具有吸引力的研究课题。淀粉作为一种生物聚合物因其低廉的成本和在自然界中丰富的可用性而特别具有解决这一问题的吸引力。为了去除水中的Ni2+, Fe2+/3+和Mn2+,我们分析了两种天然淀粉和两种氧化淀粉,即马铃薯淀粉和玉米淀粉作为生物吸附剂。利用扫描电镜对不同淀粉的形貌和表面性质进行了研究。为了评估淀粉吸附的有效性,我们根据德国饮用水条例的值测试了三种实际浓度,分别是Mn2+, Fe2+和Ni2+限值的10倍,100倍和1000倍。用ICP-OES测定不同离子的浓度。此外,通过随后的吸附等温线研究,我们评估了吸附能力和机理。采用Langmuir、Sips和Dubinin-Radushkevich模型拟合吸附等温线,其中Sips模型的相关性最高。氧化马铃薯淀粉的有效吸附量分别为77µmol Fe2+/g、84µmol Mn2+/g和118µmol Ni2+/g。研究了在水中初始膨胀对吸附性能的影响,我们发现氧化淀粉的去除率明显下降,特别是由于在其结合位点与水分子形成氢键。
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Native and Oxidized Starch for Adsorption of Nickel, Iron, and Manganese Ions from Water
The adsorption of heavy metal ions from surface water with ecologically safe and biodegradable biopolymers is increasingly becoming an appealing research challenge. Starch as a biopolymer is exceptionally attractive to solve this problem for its low cost and abundant availability in nature. To expel Ni2+, Fe2+/3+, and Mn2+ from water, we analyzed two native and two oxidized starches, namely potato and corn starch, as bio-adsorbers. The morphology and the surface property of the different starches were studied using SEM. To assess the effectiveness of adsorption onto the starches, we tested three realistic concentrations based on German drinking water ordinance values that were 10-fold, 100-fold, and 1000-fold the limits for Mn2+, Fe2+, and Ni2+, respectively. The concentration of the different ions was measured using the ICP-OES. Furthermore, from subsequent investigations of the adsorption isotherms, we evaluated the adsorption capacities and mechanisms. The adsorption isotherms were fitted using the Langmuir, Sips, and Dubinin–Radushkevich models, whereby Sips showed the highest correlation. Oxidized potato starch achieved viable adsorption capacities of 77 µmol Fe2+/g, 84 µmol Mn2+/g, and 118 µmol Ni2+/g. Investigating the influence of initial swelling in water on the adsorption performance, we found that especially the percentage removal with oxidized starches decreased significantly due to the formation of hydrogen bonds with water molecules at their binding sites with prior swelling.
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