Chen Baoliang, Chen Zaiming
Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China.
Chemosphere. 2009 Jun;76(1):127-33. doi: 10.1016/j.chemosphere.2009.02.004. Epub 2009 Mar 17.
Biochars, derived from biomass, are increasingly recognized as an environmental-friendly sorbent to abate organic pollutants. Sorption variations of biochars with their pyrolytic temperatures are evaluated. Nine biochars of orange peels with different pyrolytic temperatures (150-700 degrees C, referred as OP150-OP700) were characterized via elemental analysis, BET-N(2) surface area, and Fourier transform infrared spectroscopy. Sorption of naphthalene and 1-naphthol by the biochars in water are compared. Sorption isotherms varied from linear to Freundlich with increasing pyrolytic temperature. The respective contributions of adsorption and partition to total sorption were correlated with biochars' structural parameters. For OP150-OP600, sorption of 1-naphthol was significantly larger than naphthalene due to the former owning additional specific interactions. For 1-naphthol with high concentrations, the OP200 exhibited the maximal sorption capacity due to its largest partition and high adsorption among nine biochars. For 1-naphthol with low concentrations and naphthalene, the OP700 displayed the maximal sorption capacity. These observations provide a reference to the use of biochars as engineered sorbents for environmental applications.
生物炭由生物质衍生而来，越来越被认为是一种用于减少有机污染物的环保型吸附剂。本文评估了生物炭在不同热解温度下的吸附变化情况。通过元素分析、BET-N₂ 表面积测定以及傅里叶变换红外光谱法对九种不同热解温度（150 - 700摄氏度，记为OP150 - OP700）的橙皮生物炭进行了表征。比较了这些生物炭对水中萘和1-萘酚的吸附情况。随着热解温度的升高，吸附等温线从线性变化为弗伦德利希等温线。吸附和分配对总吸附的各自贡献与生物炭的结构参数相关。对于OP150 - OP600，由于1-萘酚具有额外的特定相互作用，其吸附量显著大于萘。对于高浓度的1-萘酚，OP200因其在九种生物炭中具有最大的分配作用和较高的吸附量而表现出最大吸附容量。对于低浓度的1-萘酚和萘，OP700表现出最大吸附容量。这些观察结果为将生物炭用作环境应用中的工程吸附剂提供了参考。
