Enhancement of acetate production in hydrogen-mediated microbial electrosynthesis reactors by addition of silica nanoparticles

Bioresources and Bioprocessing

Research

Kun Guo¹  Kai Cui¹  Zeyan Pan¹  Wenfang Cai¹  Zhuangzhuang Liu²  Xiaona Hu³ 

[1] School of Chemical Engineering and Technology, Xi’an Jiaotong University, 710049, Xi’an, China;School of Chemical Engineering and Technology, Xi’an Jiaotong University, 710049, Xi’an, China;College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, China;School of Ecology and Environment, Zhengzhou University, 450001, Zhengzhou, China;

关键词: Microbial electrosynthesis;    H-mediated;    Silica nanoparticles;    Mass transfer;    Acetate production;   

DOI  :  10.1186/s40643-023-00627-6

 received in 2022-10-27, accepted in 2023-01-09,  发布年份 2023

来源: Springer

【 摘 要 】

Microbial electrosynthesis (MES) is a promising technology for CO2 fixation and electrical energy storage. Currently, the low current density of MES limits its practical application. The H2-mediated and non-biofilm-driven MES could work under higher current density, but it is difficult to achieve high coulombic efficiency (CE) due to low H2 solubility and poor mass transfer. Here, we proposed to enhance the hydrogen mass transfer by adding silica nanoparticles to the reactor. At pH 7, 35 ℃ and 39 A·m− 2 current density, with the addition of 0.3wt% silica nanoparticles, the volumetric mass transfer coefficient (kLa) of H2 in the reactor increased by 32.4% (from 0.37 h− 1to 0.49 h− 1), thereby increasing the acetate production rate and CE of the reactor by 69.8% and 69.2%, respectively. The titer of acetate in the reactor with silica nanoparticles (18.5 g·L− 1) was 56.9% higher than that of the reactor without silica nanoparticles (11.8 g·L− 1). Moreover, the average acetate production rate of the reactor with silica nanoparticles was up to 2.14 g·L− 1·d− 1 in the stable increment phase, which was much higher than the other reported reactors. These results demonstrated that the addition of silica nanoparticles is an effective approach to enhancing the performance of H2-mediated MES reactors.Graphical Abstract

【 授权许可】

CC BY   
© The Author(s) 2023

【 图 表 】

Fig. 2

41116_2022_35_Article_IEq172.gif

Fig. 5

41116_2022_35_Article_IEq168.gif

Fig. 2

41116_2022_35_Article_IEq159.gif

41116_2022_35_Article_IEq156.gif

41116_2022_35_Article_IEq149.gif