生物炭对双酚A和17α-乙炔基雌二醇在土壤中吸附的影响  

Influence of biochar on the sorption of bisphenol A and 17α-ethynylestradiol in soil

作　　者：张博[1] 李杰[1] 谈广才 许楠[1] 

机构地区：[1]北京大学深圳研究生院环境与能源学院,重金属污染控制与资源化重点实验室,深圳518055

出　　处：《环境工程学报》2016年第9期5255-5261,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51579003)

摘　　要：研究了添加生物炭对土壤吸附双酚A（BPA）和17α-乙炔基雌二醇（EE2）的影响。结果表明：BPA和EE2在添加生物炭前后的土壤中的等温吸附线都能被Freundlich模型很好地拟合,所有等温吸附线都呈现出非线性（非线性参数n在0.40～0.79之间）,且添加生物炭之后吸附参数KF显著增大。根据等温吸附线,在污染物的平衡浓度为0.01 mg·L-1时,添加4%生物炭后,BPA和EE2的土水分配系数（Kd）分别提高了2.6和3.0倍,此时生物炭对土壤吸附BPA和EE2的贡献度分别达到72.5%和88.5%。进一步研究发现,添加生物炭使土-水吸附系统的p H及溶解性有机质浓度（DOC）升高,这对污染物在土壤中的吸附分别表现为一定的抑制和促进作用。添加生物炭对土壤吸附EE2的促进效果优于BPA,这主要是由于EE2比BPA具有更强的疏水性。Effect of adding biochar on the sorption of bisphenol A （BPA） and 17cL-ethynylestradiol （EE2） in soil was evaluated. The sorption isotherms of BPA and EE2 in biochar-free and 4% biochar-amended soils fit well to the Freundlich model. All isotherms were nonlinear （n ranged from 0.40 to O. 79） , and the Freundlieh sorption coefficient （Kr） increased significantly in response to addition of biochar. At the pollutant equilibrium concentration of 0.01 mg· L-1, the application of 4% biochar to the soil increased the solid-water distribution coefficient （Kd） by 2.6 times for BPA and 3.0 times for EE2, representing significant increases. Calculations showed that 4% biochar in the soil accounted for 72.5% sorption of BPA and 88.5% sorption of EE2. The bio- char also increased the pH and DOC of the solid-water system, with respective negative and positive effects on the sorption of the pollutants. The influence of adding biochar on the sorption of EE2 was greater than the influ- ence on BPA sorption, which could be attributed to the higher hydrophobicity of EE2.

关 键 词：生物炭 土壤 内分泌干扰物 吸附 

分 类 号：X53[环境科学与工程—环境工程]