摘要
测定分析了草木灰的孔隙结构、表面性质及化学组成,研究了PCB52在草木灰上的吸附动力学、吸附等温线及解吸等温线的特征,结果表明Freundlich方程和二级动力学方程具有较高的拟合相关系数,说明吸附可能是复杂的多层吸附过程,且明显分为快速吸附和慢速吸附2个过程。解吸等温线呈现出非线性,且有一定的滞后性。随着草木灰浓度的增加HI值减小,即解吸滞后程度减小,且在高平衡浓度的条件下表现出更小的HI值,说明其更容易从吸附剂上解吸下来。
Pore structure, surface property and chemical constitution of plant ash were determined and analyzed. Sorption kinetics and adsorption/desorption isotherm of PCB52 on plant ash were examined respectively, and results demonstrated that Freundich equation and second-order equation fit best with the highest regression coefficients, implying that sorption may be a complex multi-layer adsorption, and were divided into fast and slow sorption stage. The desorption isotherms presented nonlinear, and desorption process showed some of the lag phenomenon. With increase of plant ash concentration, HI value were reduced, i.e. desorption lag were reduced, and smaller HI value were showed in the higher concentration conditions, which indicated that the adsorbents were desorbed from the sediments much easier in higher concentration conditions.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第6期42-46,共5页
Environmental Science & Technology
基金
国家自然科学基金:PBTC在炭质吸附剂上的吸附特征及其生物可利用性变化机制(20977006)
关键词
草木灰
四氯联苯
动力学
吸附量
解吸
plant ash
PCB52
dynamics
adsorption capacity
desorption
