Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon 200-701, Republic of Korea.
Bioresour Technol. 2013 Sep;143:615-22. doi: 10.1016/j.biortech.2013.06.033. Epub 2013 Jun 19.
In this study, pine needles were converted to biochar (BC) at different pyrolysis temperatures of 300, 500, and 700 °C to sorb trichloroethylene (TCE), and the changes in BC properties with each temperature were evaluated. Pyrolysis temperature showed a pronounced effect on BC properties. Decreases in molar H/C and O/C ratios resulted from removing O- and H-containing functional groups with increasing temperature, and produced high aromaticity and low polarity BCs. BCs produced at higher temperature showed greater TCE removal efficiency from water due to their high surface area, micro-porosity, and carbonized extent. The performance of various BCs for TCE removal was assessed by the Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich adsorption models, among which the Temkin and Dubinin-Radushkevich models best described TCE adsorption onto various BCs, indicating prevailing sorption mechanism as pore-filling.
在这项研究中，松针在 300、500 和 700°C 的不同热解温度下转化为生物炭 (BC) 以吸附三氯乙烯 (TCE)，并评估了每个温度下 BC 特性的变化。热解温度对 BC 特性有显著影响。随着温度的升高，去除了含 O 和 H 的官能团，导致摩尔 H/C 和 O/C 比降低，产生了高芳香度和低极性的 BC。由于高表面积、微孔和碳化程度，在较高温度下产生的 BC 对水中 TCE 的去除效率更高。通过 Freundlich、Langmuir、Temkin 和 Dubinin-Radushkevich 吸附模型评估了各种 BC 对 TCE 去除的性能，其中 Temkin 和 Dubinin-Radushkevich 模型最能描述各种 BC 对 TCE 的吸附，表明主要的吸附机制是孔填充。
