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.

以2,4,6-三氯苯酚（2,4,6-TCP）为代表的氯酚类化合物引发的土壤污染问题广受关注，这类化合物环境持久性强、难以降解，且具有致癌性。因此，亟需开发这类污染物的原位降解技术。本研究将生物炭（Biochar）作为固持污染物、降低其向下迁移，并辅助降解土壤中2,4,6-TCP的材料开展探究。在两项土柱试验中，小麦秸秆（Triticum aestivum L.）衍生生物炭（热解温度450℃）以最高5%的质量比施入土壤后，可提升土壤含水量与土壤有机碳（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：改良后的土壤水分运移与持水能力，使2,4,6-TCP更易被运移并吸附于生物炭表面的有机官能团，进而促进其降解。施入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化合物（如2,4,6-TCP）的向下迁移能力并强化其降解，从而改善环境质量。