Abstract A microbial method using baker's yeast (Saccharomyces cerevisiae) was developed to collect aqueous Pd(II) ions through bioreductive deposition and biosorption at room temperature. Resting cells of S. cerevisiae reduced 1.0 mol/m3 aqueous Pd(II) ions in a Na2PdCl4 solution to metallic Pd(0) at pH 7.0 within 60 min when formate was provided as the electron donor under anaerobic conditions. Palladium nanoparticles were deposited on the surface of S. cerevisiae cells. The yeast cells also exhibited an excellent ability to collect Pd(II) ions from a 1.0 mol/m3 aqueous solution at pH 1.0 within 30 min under air. The baker's yeast was also applied to the effective recovery of aqueous Pd(II) ions in 1000–2000 mol/m3 HNO3 solutions (pH −0.3 to 0.0). When processing electroplating solutions, the yeast cells were able to selectively collect soluble Pd(II) at pH 0.0–0.8 within 60 min. Our proposal of using commercially available baker's yeast as a biosorbent enables rapid and efficient recovery of soluble palladium over the pH range − 0.30 to 7.0.

中文翻译：

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面包酵母通过生物还原沉积和生物吸附对钯的微生物回收

摘要 开发了一种使用面包酵母 (Saccharomyces cerevisiae) 的微生物方法，通过室温下的生物还原沉积和生物吸附来收集水性 Pd(II) 离子。当在厌氧条件下提供甲酸盐作为电子供体时，酿酒酵母的静息细胞在 60 分钟内将 Na2PdCl4 溶液中的 1.0 mol/m3 水性 Pd(II) 离子还原为 pH 7.0 的金属 Pd(0)。钯纳米颗粒沉积在酿酒酵母细胞的表面。酵母细胞还表现出极好的在空气中在 30 分钟内从 pH 1.0 的 1.0 mol/m3 水溶液中收集 Pd(II) 离子的能力。面包酵母还用于有效回收 1000–2000 mol/m3 HNO3 溶液（pH -0.3 到 0.0）中的 Pd(II) 离子水溶液。在处理电镀液时，酵母细胞能够在 60 分钟内选择性地收集 pH 值为 0.0-0.8 的可溶性 Pd(II)。我们使用市售面包酵母作为生物吸附剂的提议能够在 pH 范围 - 0.30 至 7.0 内快速有效地回收可溶性钯。