Wang Chen, Holm Peter E, Andersen Mogens Larsen, Thygesen Lisbeth Garbrecht, Nielsen Ulla Gro, Hansen Hans Christian Bruun
Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
Bioresour Technol. 2023 Nov;388:129785. doi: 10.1016/j.biortech.2023.129785. Epub 2023 Sep 16.
In this study, cyanobacterial biochars (CBs) enriched/doped with non-metallic elements were prepared by pyrolysis of biomass amended with different N, S, and P containing compounds. Their catalytic reactivity was tested for persulfate oxidation of the antibiotic norfloxacin (NOR). N and S doping failed to improve CB catalytic reactivity, while P doping increased reactivity 5 times compared with un-doped biochar. Biochars produced with organic phosphorus dopants showed the highest reactivity. Post-acid-washing improved catalytic reactivity. In particular, 950 ℃ acid-washed triphenyl-phosphate doped CB showed the largest degradation rate and reached 79% NOR mineralization in 2 h. Main attributes for P-doped CBs high reactivity were large specific surface areas (up to 655 m/g), high adsorption, high C-P-O content, graphitic P and non-radical degradation pathway (electron transfer). This study demonstrates a new way to reuse waste biomass by producing efficient P-doped metal-free biochars and presents a basic framework for designing carbon-based catalysts for organic pollutant degradation.
在本研究中，通过对添加了不同含氮、硫和磷化合物的生物质进行热解，制备了富含/掺杂非金属元素的蓝藻生物炭（CBs）。测试了它们对过硫酸盐氧化抗生素诺氟沙星（NOR）的催化活性。氮和硫掺杂未能提高CB的催化活性，而磷掺杂使活性比未掺杂的生物炭提高了5倍。用有机磷掺杂剂制备的生物炭表现出最高的活性。酸洗后提高了催化活性。特别是，950℃酸洗的磷酸三苯酯掺杂CB表现出最大的降解速率，在2小时内NOR矿化率达到79%。磷掺杂CBs高活性的主要特性是大比表面积（高达655 m/g）、高吸附性、高C-P-O含量、石墨化磷和非自由基降解途径（电子转移）。本研究展示了一种通过生产高效磷掺杂无金属生物炭来再利用废弃生物质的新方法，并为设计用于有机污染物降解的碳基催化剂提供了一个基本框架。
