Tang Wei, Jing Fanqi, Laurent Zanli Bi Lepohi Guy, Liu Yuyan, Chen Jiawei
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, 100083, PR China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, PR China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, 100083, PR China; School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, PR China.
Chemosphere. 2021 Aug;276:130106. doi: 10.1016/j.chemosphere.2021.130106. Epub 2021 Mar 1.
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一种用于土壤改良的富碳产品，而磺胺吡啶（SPY）是土壤中典型的磺胺类抗生素。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会在环境中经历长期老化，而关于这种老化对SPY吸附的影响的信息尚未得到充分认识。在本研究中，采用模拟老化过程方法对生物炭进行高温和冻融气候处理两个月。进行了SPY的批量吸附和淋溶柱实验，以比较新鲜/老化生物炭-土壤系统。结果表明，添加生物炭可以提高土壤pH值和饱和湿度，老化生物炭含有更多的含氧官能团，表现出更高的亲水性和极性。未添加SPY的土壤的吸附机制主要源于弱疏水分布。所有新鲜和老化生物炭改良的土壤都增加了SPY的吸附，这是由于SPY与生物炭表面官能团之间的氢键相互作用得到改善，表明这种主动吸附强于被动分配。我们有必要重新考虑，老化生物炭改良的土壤，尤其是经过两个月高温老化的生物炭改良的土壤，对SPY表现出最高的吸附性能和最低的解吸能力。SPY淋溶柱实验和酸雨淋溶试验均表明，在热带或高温气候地区应用生物炭修复有机污染土壤是有利的，但我们应该意识到在寒冷地区用生物炭改良土壤的不确定性。
