苏帆 吴挺勋 邓惠 赵媛媛 林天 俞花美 吴晓晨 葛成军

摘  要：以650 ℃下制备甘蔗渣生物质炭（BC650）为研究对象，在模拟自然条件下，在BC650上负载环境中常见的溶解性有机质（DOMs）即小分子没食子酸（GA）和大分子黄腐酸（HA），并对其性质进行表征;再以典型抗生素土霉素为目标污染物，探究外源DOMs耦合生物质炭对抗生素的吸附性能的影响。结果表明，DOMs的负载提高了生物质炭的比表面积，生物质炭的表面化学性质发生改变;预载DOMs后，生物质炭对土霉素的吸附能力明显降低，且GA负载的抑制作用较HA更为显著，就平衡吸附量而言，HA处理后其下降了10%，而GA的处理使其降低了30%，DOMs的预载对生物质炭吸附抗生素的影响可能是由DOMs处理改变了生物质炭的表面化学性质而致;DOMs负载前后生物质炭对土霉素表现出非线性吸附，氢键作用为主要吸附机制。所得结果可为生物质炭在抗生素污染控制中的实际应用提供重要的理论依据。

关键词：生物质炭;溶解性有机质;土霉素;吸附行为

中图分类号：X505      文献标识码：A

Sorption of Oxytetracycline by Biochar with DOMs Preloading Treatment

SU Fan1，2， WU Tingxun1，2， DENG Hui1，2， ZHAO Yuanyuan1，2， LIN Tian3， YU Huamei1，2， WU Xiaochen3*，

GE Chengjun1，2*

1. Key Labrotoary of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province， Haikou， Hainan 570228， China; 2. College of Ecology and Environment， Hainan University， Haikou， Hainan 570228， China; 3 Hainan Academy of Environmental Sciences， Haikou， Hainan 571126， China

Abstract： In the present work， biochar （BC650）， prepared from the pyrolysis of sugarcane wastes at a heating temperature of 650 ℃， was loaded with two different types of DOMs， i.e. gallic acid （GA） with a smaller size and larger fulvic acid （HA）. The main properties were characterized with elemental analyzer， scanning electron microscope， etc. Oxytetracycline was selected as the target micropollutants， and its sorption by biochar with DOMs loading was also investigated. Biochar with DOMs treatment increased the specific surface area of biochar， and the chemical properties were also changed. Sorption of oxytetracycline by biochar was reduced significantly in the presence of DOMs， and the inhibition of GA for oxytetracycline sorption by biochar was larger than that of HA. The reduction seemed to be related to the change of chemical structure of biochar after DOMs loading. All isothermal curves were non-linear， and sorption of oxytetracycline to biochar was mainly governed by H-bonding interaction. The results could provide an important information for the practical application of biochar for antibiotic pollution control.

Keywords： biochars; dissolved organic matters; oxytetracycline; sorption

DOI： 10.3969/j.issn.1000-2561.2021.04.040

生物質炭是生物质在缺氧或厌氧条件下经裂解炭化产生的一类具有高比表面积和高度芳香化结构的物质[1-2]。因其具有较大的比表面积和发达的微孔结构等特性，生物质炭对土壤和水环境中重金属、农药、抗生素等污染物表现出良好的吸附性能[3-7]。近几年来，国内外很多的研究人员利用木屑、作物秸秆、果皮、动物粪便废弃物甚至城市污泥等常见的农林废弃物制备生物质炭，并将其运用于治理工业废水或修复污染土壤[2， 8-12]。……