Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon, 200-701, South Korea.
Environ Sci Pollut Res Int. 2013 Dec;20(12):8364-73. doi: 10.1007/s11356-013-1676-z. Epub 2013 Apr 23.
Trichloroethylene (TCE) is one of the most hazardous organic pollutants in groundwater. Biochar produced from agricultural waste materials could serve as a novel carbonaceous adsorbent for removing organic contaminants from aqueous media. Biochars derived from pyrolysis of soybean stover at 300 °C and 700 °C (S-300 and S-700, respectively), and peanut shells at 300 °C and 700 °C (P-300 and P-700, respectively) were utilized as carbonaceous adsorbents to study batch aqueous TCE remediation kinetics. Different rate-based and diffusion-based kinetic models were adopted to understand the TCE adsorption mechanism on biochars. With an equilibrium time of 8-10 h, up to 69 % TCE was removed from water. Biochars produced at 700 °C were more effective than those produced at 300 °C. The P-700 and S-700 had lower molar H/C and O/C versus P-300 and S-300 resulting in high aromaticity and low polarity accompanying with high surface area and high adsorption capacity. The pseudo-second order and intraparticle diffusion models were well fitted to the kinetic data, thereby, indicating that chemisorption and pore diffusion were the dominating mechanisms of TCE adsorption onto biochars.
三氯乙烯（TCE）是地下水中最危险的有机污染物之一。由农业废料制成的生物炭可以作为一种新型的碳质吸附剂，用于从水介质中去除有机污染物。分别在 300°C 和 700°C（分别为 S-300 和 S-700）下由大豆秸秆和 300°C 和 700°C（分别为 P-300 和 P-700）下由花生壳热解得到的生物炭被用作碳质吸附剂，以研究批处理水相中 TCE 的修复动力学。采用了不同的基于速率和基于扩散的动力学模型来理解 TCE 在生物炭上的吸附机制。在 8-10 小时的平衡时间内，高达 69%的 TCE 从水中被去除。在 700°C 下生产的生物炭比在 300°C 下生产的生物炭更有效。与 P-300 和 S-300 相比，P-700 和 S-700 的摩尔 H/C 和 O/C 较低，导致其具有较高的芳香度和较低的极性，同时具有较高的表面积和较高的吸附能力。准二级和内扩散模型很好地拟合了动力学数据，表明 TCE 吸附到生物炭上的主要机制是化学吸附和孔扩散。
