Tan Wenbing, Wang Lei, Yu Hanxia, Zhang Hui, Zhang Xiaohui, Jia Yufu, Li Tongtong, Dang Qiuling, Cui Dongyu, Xi Beidou
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Materials (Basel). 2019 Apr 2;12(7):1079. doi: 10.3390/ma12071079.
Biochar is widely used in the environmental-protection field. This study presents the first investigation of the mechanism of biochar prepared using iron (Fe)-rich biomass and its impact on the reductive removals of Orange G dye by MR-1. The results show that biochars significantly accelerated electron transfer from cells to Orange G and thus stimulated reductive removal rate to 72-97%. Both the conductive domains and the charging and discharging of surface functional groups in biochars played crucial roles in the microbial reduction of Orange G to aniline. A high Fe content of the precursor significantly enhanced the conductor performance of the produced biochar and thus enabled the biochar to have a higher reductive removal rate of Orange G (97%) compared to the biochar prepared using low-Fe precursor (75%), but did not promote the charging and discharging capacity of the produced biochar. This study can prompt the search for natural biomass with high Fe content to confer the produced biochar with wide-ranging applications in stimulating the microbial reduction of redox-active pollutants.
生物炭在环境保护领域有广泛应用。本研究首次探究了利用富铁生物质制备生物炭的机制及其对MR-1还原去除橙黄G染料的影响。结果表明，生物炭显著加速了电子从细胞向橙黄G的转移，从而将还原去除率提高到72% - 97%。生物炭中的导电域以及表面官能团的充放电在将橙黄G微生物还原为苯胺的过程中都起到了关键作用。前驱体中高含量的铁显著增强了所制备生物炭的导电性能，因此与使用低铁前驱体制备的生物炭（75%）相比，该生物炭对橙黄G具有更高的还原去除率（97%），但并未促进所制备生物炭的充放电能力。本研究有助于寻找高含铁量的天然生物质，以使所制备的生物炭在刺激微生物还原氧化还原活性污染物方面具有广泛应用。
