Carbon quantum dots in-situ relieve humic acids inhibition on methanogens while significantly increasing the abundance of Methanosarcinaceae

原位 碳纤维 产甲烷菌 化学 金属 腐植酸 环境化学 水溶液中的金属离子 核化学 材料科学 甲烷 有机化学 肥料 复合数 复合材料
作者
Qiang Liu,Yuanting Xu,Yeqing Li,Chengjie Ma,Shuo Chen,Lu Feng,Quan Xu,Junting Pan,Bo Peng,Hongjun Zhou,Xu Chen
出处
期刊:Journal of Cleaner Production [Elsevier BV]
卷期号:419: 138258-138258
标识
DOI:10.1016/j.jclepro.2023.138258
摘要

Monophenols form humic acids (HA) through polycondensation reaction in the anaerobic digestion (AD) process, which will inhibit AD process. Currently, metal ions are the option for in-situ relieving HA inhibition during AD, but excess metal ions are harmful to microorganisms. In this study, carbon quantum dots (CQDs, a non-metallic materials) were proposed to relieve HA inhibition in-situ. We investigated the effect of HA on AD acidification and methanation stage, and synthesized CQDs using sodium citrate (s-CQDs) and p-phenylenediamine (p-CQDs) as precursors to relieve the HA inhibition in-situ. Results showed that s-CQDs (3.0 g/L) significantly increased the cumulative CH4 yield from AD of ethanol with 1.0 g/L HA (1.9 times higher than that without s-CQDs). Microbiological analysis indicated the most dominant methanogen was Methanosarcinaceae, with richness of 89.7%. Compared to the HA inhibition system, the relative abundance of Methanosarcinaceae increased by 87.5%. The analysis of interaction mechanism between CQDs and HA indicated that s-CQDs has an in-situ binding effect to HA by reacting with -OH, CC, and -COOH. This study provided a novel means for in-situ relieving HA inhibition, and illustrated the interaction mechanism between CQDs and HA, which will guide the application in production of bioenergy.
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