Sorption of organic compounds on fresh black carbons (BCs) can be greatly attenuated in soil over time. We examined herein the changes in surface properties of maize straw-derived BCs (biochars) after aged in a black soil and their effects on the sorptive behaviors of naphthalene, phenanthrene and 1,3-dinitrobenzene. Dissolved fulvic and humic acids extracted from the soil were used to explore the role of dissolved organic carbon (DOC) in the aging of biochars. Chromatography analysis indicated that DOC molecules with relatively large molecular weight were preferentially adsorbed on the biochars during the aging processes. DOC sorption led to blockage of the biochar's micropores according to N₂ and CO₂ adsorption analyses. Surface chemistry of the biochars was also substantially modified, with more O-rich functional groups on the aged biochars compared to the original biochars, as evidenced by Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses. The changes in both the physical and chemical surface properties of biochars by DOC led to significant attenuation of the sorption capacity and nonlinearity of the nonionic organic compounds on the aged biochars. Among the tested organic compounds, phenanthrene was the most attenuated in its sorption by the aging treatments, possibly because of its relatively large molecular size and hydrophobicity. The information can help gain a mechanistic understanding of interactions between BCs and organic compounds in soil environment.

随着时间的推移，有机化合物对新鲜黑碳（BCs）的吸附作用会大大减弱。我们在本文中研究了在黑土中老化后玉米秸秆衍生的BCs（生物炭）的表面性质的变化及其对萘，菲和1,3-二硝基苯的吸附行为的影响。从土壤中提取的可溶性黄腐酸和腐殖酸被用于探索溶解性有机碳（DOC）在生物炭老化中的作用。色谱分析表明，在老化过程中，分子量较大的DOC分子优先吸附在生物炭上。DOC吸附导致根据N ₂和CO ₂阻塞生物炭的微孔吸附分析。生物炭的表面化学也得到了显着修饰，与原始生物炭相比，老化的生物炭上具有更多的富含O的官能团，近边缘X射线吸收精细结构（NEXAFS）光谱和X射线光电子能谱证明了这一点（ XPS）分析。DOC对生物炭的物理和化学表面性质的变化导致老化生物炭上非离子有机化合物的吸附能力和非线性大大降低。在测试的有机化合物中，菲通过时效处理的吸收衰减最大，这可能是由于其相对较大的分子大小和疏水性。该信息有助于对土壤环境中BCs与有机化合物之间的相互作用进行机械理解。