底泥制备的生物炭对卡马西平的吸附解吸研究

Sorption/Desorption Behavior of Carbamazepine in Biochars Derived from Sediment of Dianchi Lake

以滇池底泥作为原料制备的生物炭具有多方面的环境功效,本研究对卡马西平在生物炭上的吸附/解吸行为进行了探讨,以进一步了解生物炭对有机污染物环境行为的控制性作用.样品中碳元素随着烧制过程逐渐芳香化,形成相对紧凑的结构,表面积和孔隙体积都增大,为卡马西平的表面吸附提供了更多的位点,Freundlich模型能够较准确地描述生物炭对卡马西平的吸附等温线.随着烧制温度的升高,生物炭对卡马西平的吸附增大,非线性特征变强,释放程度降低.这项研究表明,高有机质含量的沉积物经过热处理后,作为土壤添加剂可以高效地滞留卡马西平,对于降低卡马西平的迁移和风险有重要的环境意义.

Through the sorption/desorption study of carbamazepine on biochars derived from Dianchi Lake sedi- ment with high organic matter content, the controlling role of biochars in regulating the environmental behavior of organic contaminants is investigated in this paper. The results show that Freundlich model can accurately de- scribe the sorption isotherms of carbamazepine on biochars which are prepared at different temperatures. During the thermal treatment, the carbon content is aromatized, and a relatively compact structure is formed. The sur- face area and pore volume of the biochars are increased providing more sorption sites for carbamazepine. Thus, increased sorption coefficients, increased sorption nonlinearity, and decreased desorption of carbamazepine is ob- served. It is production. epine in the suggested that sediments with higher organic matter content can be applied as a source of biochar The application of this type of biaochars can significantly reduce the transpc,rt and risk of carbamaz- environment.