Dataset for: BIOCHAR IMMOBILIZES AND DEGRADES 2,4,6-TRICHLOROPHENOL IN SOILS

Soil contamination by chlorophenol compounds, such as 2,4,6-trichlorophenol (2,4,6-TCP), is of great concern because they are environmentally persistent, difficult to degrade, and can lead to cancer. Thus, means of degrading these compounds in-situ are desperately needed. Biochar was investigated as a material to sequester, reduce downward transport, and aid in soil 2,4,6-TCP degradation. In two column studies, wheat straw (Triticum aestivum L.)-derived biochar (pyrolyzed at 450 oC) application to soil (up to 5% by wt.) improved soil water and soil organic carbon (SOC) content. Biochar reduced 2,4,6-TCP downward transport, likely due to improved soil water mobility and retention allowing 2,4,6-TCP to be more easily transported and sorbed to organic functional groups on biochar, leading to enhanced degradation. The 2,4,6-TCP was rapidly degraded into a combination of benzene derivatives and low molecular weight organic compounds in the first two months following biochar application. This study provides evidence that biochars can be used to improve environmental quality by lessening the downward transport and enhancing the degradation of the organochlorine compounds such as 2,4,6-TCP.氯酚类化合物（如2,4,6-三氯苯酚（2,4,6-TCP））引发的土壤污染问题广受关注，该类化合物环境持久性强、降解难度大，且具有致癌性。因此，亟需开发此类污染物的原位降解手段。本研究以生物炭（biochar）为功能材料，探究其固持污染物、降低2,4,6-TCP向下迁移能力，并辅助降解土壤中2,4,6-TCP的效果。在两项柱实验中，向土壤施加小麦秸秆（Triticum aestivum L.）热解制备的生物炭（热解温度450℃，施用量最高可达5%质量分数），可提升土壤含水率与土壤有机碳（SOC）含量。生物炭可降低2,4,6-TCP的向下迁移能力，其潜在机制为：生物炭改善了土壤水分运移特性与持水能力，使2,4,6-TCP更易被运移并吸附至生物炭表面的有机官能团上，进而强化了降解进程。施加生物炭后的前两个月内，2,4,6-TCP可快速降解为苯系衍生物与低分子量有机化合物的混合物。本研究证实，生物炭可通过降低氯代有机污染物（如2,4,6-TCP）的向下迁移能力并强化其降解过程，从而改善环境质量。