H2介导混合培养微生物电合成,从CO2产生高度乙酸
Yanhong Bian1,2, Aaron Leininger1,2, Harold D May2
1Department of Civil and Environmental Engineering, Princeton University, 86 Olden St, Princeton, NJ, 08544, United States.
Environmental science and ecotechnology
|November 14, 2023
概括
微生物电合成 (MES) 现在可以使用一种新的碳阴极来提高供应,以达到高酸盐度. 这一进步有望克服将二氧化碳转化为有价值产品的规模化限制.
科学领域:
- 生物技术是生物技术.
- 电化学 电化学 电化学
- 环境科学 环境科学
背景情况:
- 微生物电合成 (MES) 将二氧化碳转化为有价值的产品,但由于产量低,阻碍了商业化.
- 在MES阴极使用H2的介导电子转移提供了比直接生物膜方法更高的转换率.
- 优化H2供应和阴极材料对于提高MES效率和产品产量至关重要.
研究的目的:
- 调查使用泡装饰的碳阴极,以改善在MES中的H2供应.
- 在混合社区MES系统中实现高酸盐标位.
- 与传统材料相比,评估新型阴极的性能.
主要方法:
- 在MES系统中利用混合微生物群落.
- 采用泡装饰的碳阴极,平衡电位为 -0.89 V 与 SHE 相比.
- 与不钢和裸碳色阴极相比,性能比较.
- 在长时间运行期间监控乙酸盐度和法拉第效率.
主要成果:
- 使用碳阴极在14天内达到12.5g L-1的乙酸盐度,明显超过不钢 (5.2g L-1) 和碳 (1.7g L-1).
- 在32天的运行中达到16.0gL-1的酸盐度峰值.
- 观察到酸盐与阳极室 (5.8 g L-1) 的交叉和低的法拉代效率,表明部分的H2利用.
结论:
- 碳阴极有效地增强了微生物电合成的现场H2供应,从而导致高酸盐标位.
- 使用改进的阴极材料进行 H2 介导的电子转移,对推进 MES 技术显著有前途.
- 需要进一步优化,以提高H2利用效率,并尽量减少产品交叉,以实现商业可行性.
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