Revealing the mechanism of carboxyl groups on biochar filler for enhancing biodegradation of N,N-dimethylacetamide.
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75% confidenceThe study reveals the mechanism of carboxyl groups on biochar filler in enhancing biodegradation of N,N-dimethylacetamide, showing a positive correlation between carboxyl group content and adsorption performance. The biochar fillers with higher carboxyl group content exhibited improved microbial growth, biofilm formation, and biodegradation efficiency. The optimal biodegradation performance was achieved with the biochar filler having the highest carboxyl group content.
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Abstract
The mechanism of enhancing N,N-dimethylacetamide (DMAC) biodegradation by revealing the role of carboxyl groups (-COOH) on biochar filler was studied in this work. Biochar fillers with -COOH contents of 7.5 %, 0.9 %, and 13.3 % were prepared, and named BF, Br-BF, and H 2 O 2 -BF, respectively. The DMAC adsorption characteristics of the three fillers were performed via adsorption capacity, kinetics and stability. The results indicated that the -COOH content was positively correlated with the adsorption performance, and an adsorption capacity of 1.3 g/g was obtained by H 2 O 2 -BF which was 1.3 and 1.5 times higher than that of BF and Br-BF, respectively. The microbial growth and immobilization experiments were conducted to evaluate the biocompatibility and adhesion of fillers, suggesting that -COOH was conducive to the formation of biofilms. Subsequently, the removal efficiency, product distribution, carbon and nitrogen balances were compared among the three fillers, presenting that both microbial assimilation and dissimilation could be strengthened with the increase of the -COOH contents. Optimal biodegradation performance was achieved by H 2 O 2 -BF, and the corresponding DMAC and total nitrogen removal reached to 94.7 % and 87.8 % respectively. Additionally, the mechanism of DMAC biodegradation was investigated by exploring the variations of extracellular polymeric substance, electron transport system activity, electrochemical behavior, NADH, and enzyme activity. The results suggested that the presence of -COOH could enhance the mass transfer process of DMAC from liquid phase to filler surface, and accelerate the electron transfer process during DMAC conversion. The findings provide a framework for enhancing biodegradation performance by regulation of -COOH on filler.