摘要
从自然土壤中有机质与矿物的结合方式出发,研究了Ca2+、Fe3+和Al3+桥键的有机矿质复合体对菲的吸附-解吸行为.结果表明,不同离子饱和的蒙脱石及其相应的胡敏酸-矿物复合体对菲的吸附-解吸数据都能用Freundlich模型较好地拟合,吸附容量(Kf)大小的顺序分别为Ca-Mont(0.184)>Fe-Mont(0.028)>Al-Mont(0.015)和Fe-Mont-HA(2.341)>Ca-Mont-HA(1.557)>Al-Mont-HA(1.136).有机矿质复合体的Kf值远远高于相应的矿物,表明了复合体中的胡敏酸对菲的吸附容量贡献较大.但不同离子桥键的复合体Kf值的大小与它们有机质的含量高低次序不一致,表明了复合体中有机质的含量以及有机质与矿物结合方式的不同,都可能会影响它们对菲的吸附.Ca2+和Al3+桥键的有机矿质复合体对菲的解吸都有滞后现象,滞后现象主要来自有机质对菲的吸附,而矿物对菲的解吸滞后现象影响不明显.
Sorption and desorption of phenanthrene by organo-mineral complexes with ^2＋ , Fe^3＋ and Al^3＋ as bridge cations were studied according to the association type between organic matter and minerals in natural soils. The results showed that the data of pbenanthrene sorption and desorption by different cation saturated montmorillonite and their corresponding humic acid and mineral complexes could be fitted with Freundliehmodel,and the order of the sorption capacities （Kf） were Ca-Mont （0.184） 〉 Fe-Mont （0.028） 〉 Al-Mont （0.015） and Fe-Mont-HA （2.341） 〉 Ca-Mont-HA （1.557） 〉 Al-Mont-HA （1.136）, respectively. The Kf values of humic acid and mineral complexes were far greater than those of minerals, which demonstrated that humic acid made great contributions to the sorption of phenanthrene in the organo-mineral complexes. However,the Kf values of the organo-mineral complexes with different bridge cations were not consistent with their organic carbon content, which indicated that both the organic carbon content and the combined types between organic matter and mineral could significant for Ca affect the sorption capacity of phenanthrene by the organo-mineral complexes. The desorption hysteresis of phenanthrene was significant for Ca^2 ＋ and Al^3 ＋ bridged organo-mineral complexes. Desorption hysteresis of phenanthrene was mainly from the sorption of phenanthrene by organic matter, and the contributions of mineral to the desorption hysteresis were not significant.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2008年第12期3531-3536,共6页
Environmental Science
基金
国家自然科学基金重点项目(40432005)
国家重点基础研究发展规划(973)项目(2002CB4108010)
中国科学院知识创新工程项目(CXTD-Z2005-4
KZCX2-YW-404)
福建省自然科学基金计划项目(2007J0124)
中国科学院王宽诚博士后工作奖励基金项目
关键词
菲
有机矿质复合体
桥键离子
吸附-解吸
phenanthrene
organo-mineral complex
bridge cations
sorption-desorption
