Biomass-derived biochar is a carbon-rich product for soil amendment and sulfapyridine (SPY) is a typical sulfonamide of antibiotics in the soil. Amendment with biochar for soil could control SPY sorption or mobility. However, the pristine biochar inevitably goes through the long-term ageing in the environment and the information on such ageing impact on SPY sorption is not fully recognized. The simulated ageing process methods were employed for high-temperature and freeze-thraw climate to treat the biochar for two months in the present study. The batch adsorption of SPY and leaching column experiments were conducted for comparison of the fresh/aged biochar-soil system. The results showed that biochar addition could increase soil pH and saturated moisture, aged biochars own more O-containing functional groups and exhibit higher hydrophilicity and polarity. The sorption mechanism of unamended soil with SPY primarily resulted from the weak hydrophobic distribution. All fresh and aged biochar amended soil increased SPY sorption due to improvement of H-bonding interaction between SPY and biochar surface functional groups, indicating such initiative adsorption was stronger than passive partitioning. It is of importance for us to reconsider that aged biochar-amended soil, especially two-month high-temperature aged biochar-amended soil showed the highest adsorption performance and the lowest desorption capacity towards SPY. Both SPY leaching column experiments and the acid rain leaching tests suggested that the application of biochar in tropical or high-temperature climate regions for organics polluted soil remediation is favorable, but we should be aware of the uncertainty of soil amendment with biochar in cold regions.

生物质衍生的生物炭是用于土壤改良的富含碳的产品，磺胺吡啶（SPY）是土壤中抗生素的典型磺酰胺。用生物炭改良土壤可以控制SPY的吸附或迁移。然而，原始生物炭不可避免地要经历环境中的长期老化，并且关于这种老化对SPY吸附的影响的信息还没有被完全认识。在本研究中，将模拟老化过程方法用于高温和冻融气候下，将生物炭处理两个月。进行了SPY的分批吸附和浸出柱实验，以比较新鲜/老化的生物炭-土壤系统。结果表明，添加生物炭可以提高土壤的pH值和饱和水分，老化的生物炭具有更多的含O官能团，并具有较高的亲水性和极性。SPY对未改良土壤的吸附机理主要是由于疏水分布较弱所致。由于SPY和生物炭表面官能团之间的氢键相互作用得到改善，所有新鲜和老化的生物炭改良土壤均增加了SPY吸附，表明这种主动吸附比被动分配更强。对我们而言，重新考虑老化的生物炭改良过的土壤，尤其是两个月高温老化的生物炭改良过的土壤，对SPY表现出最高的吸附性能和最低的解吸能力，对我们而言非常重要。