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标题：Recovering metals from aqueous solutions by biosorption onto phosphorylated dry baker’s yeast
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作者：Yoshihiro Ojima ; Shogo Kosako ; Maya Kihara 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2019
卷号：9
期号：1
页码：1-9
DOI：10.1038/s41598-018-36306-2
出版社：Springer Nature
摘要：Biosorption is a cost-effective and simple technique for removing heavy metals and rare earth elements from aqueous solution. Here, metals were recovered from aqueous solutions using phosphorylated dry baker's yeast cells. The cells were phosphorylated using cyclo-triphosphate, Na 3 P 3 O 9 . The total P content of the phosphorylated cells was ~1.0 mmol/g dry cell weight (DCW). The zeta potential of the phosphorylated cells was -45 mV, two times higher than for the non-phosphorylated cells. The strong negative charges of the phosphorylated cells allowed the cells to adsorb heavy metal ions such as Cd 2+ , Cu 2+ , Pb 2+ , and Zn 2+ , the adsorption capacities of which reached ~1.0 mmol/g DCW. This adsorption capacity was the highest level found in the previous studies using yeast dead biomass. The adsorbed metal ions were easily desorbed in 0.1 M HCl. The phosphorylated cells also adsorbed rare earth ions including Ce 3+ , Dy 3+ , Gd 3+ , La 3+ , Nd 3+ , Y 3+ , and Yb 3+ with high efficiency. Furthermore, the phosphorylated yeast cells selectively adsorbed the rare earth ions (Nd 3+ and Yb 3+ ) from a solution containing heavy metals and rare earth ions because trivalent positively charged ions were adsorbed preferentially over divalent ions. Thus, phosphorylated yeast cells therefore have great potential for use as novel bioadsorbents. It is also expected that this technique can be applied to many microbial materials as well as yeast.