College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
College of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
Bioresour Technol. 2024 Mar;395:130410. doi: 10.1016/j.biortech.2024.130410. Epub 2024 Feb 1.
Dark fermentation (DF) is an eco-friendly process that simultaneously achieves organic matter degradation and obtains hydrogen (H). Nonetheless, low H yield mainly caused by poor activity of key microbes, is still a problem that requires being resolved. In this work, MgFeO and CaMgFeO nanoparticles (NPs) were synthetized and served as additives to boost H form from DF. H productivity gradually increased with the rise of NPs, and declined when NPs exceeded their optimal dosages. The highest H yield was 183.6 ± 3.2 mL/g glucose at 100 mg/L of MgFeO NPs, being 35.2 % higher than that of the control yield (135.8 ± 3.1 mL/g glucose). However, the highest H yield of 171.9 ± 2.5 mL/g glucose occurred at 400 mg/L of CaMgFeO NPs, increasing by 26.6 % over the control. Interestingly, the two NPs favored the butyric acid pathway for H synthesis. This provides guidance for multi-element oxide NPs used in DF.
暗发酵（DF）是一种环保的过程，可同时实现有机物降解并获得氢气（H）。然而，由于关键微生物活性差导致的低 H 产量仍然是一个需要解决的问题。在这项工作中，合成了 MgFeO 和 CaMgFeO 纳米颗粒（NPs），并将其用作添加剂来提高 DF 中的 H 形成。H 生产率随着 NPs 的增加而逐渐增加，当 NPs 超过最佳剂量时则会下降。在 100mg/L 的 MgFeO NPs 下，H 的最高产量为 183.6±3.2mL/g 葡萄糖，比对照产量（135.8±3.1mL/g 葡萄糖）高 35.2%。然而，在 400mg/L 的 CaMgFeO NPs 下，H 的最高产量为 171.9±2.5mL/g 葡萄糖，比对照提高了 26.6%。有趣的是，这两种 NPs 都有利于 H 合成的丁酸途径。这为 DF 中使用的多元素氧化物 NPs 提供了指导。
