摘要
采用振荡平衡法,研究了施用高炉渣对土壤磷的吸附解吸特征的影响。结果表明:Langmuir、Freundlich和Temkin方程都能较好地描述高炉渣对土壤磷的吸附特征,但以Langmuir模型为最优。与对照处理相比,施用高炉渣的土壤吸附平衡常数k值增大,自由能ΔG降低,最大吸附量Xm和最大缓冲容量MBC提高;磷的解吸量增加,总解吸量和总解吸率分别是对照处理的1.05～1.25倍和1.02～1.36倍;施用高炉渣还能减弱吸附-解吸过程中的滞后效应。上述结果说明施用高炉渣可以改善土壤保蓄和供应磷的能力。
The effect of blast-furnace slags on the adsorption-desorption characteristics of soil phosphorus was investigated in this study. The results showed that the adsorption process fitted in well with Langmuir, Fre- undlich and Temkin equations, and was best simulated by Langmuir equation. Compared with the control treat- ment, the soil mixed with blast-furnace slags showed higher adsorption constant （k value） , maximum adsorption capacity（X~）, and the maximum buffer capacity （MBC）, Moreover, the desorption amount and rate was 1.05 - 1.25 and 1.02 - 1.36 greater, respectively, and the hysteresis was alleviated. However, the free energy （AG） decreased. Our results indicate that the application of blast-furnace slags could improve soil phosphorus conservation and supplying capacity.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第8期2887-2891,共5页
Chinese Journal of Environmental Engineering
基金
沈阳市科技创新条件与环境建设项目(1091179-1-00)
关键词
高炉渣
磷
吸附
解吸
土壤
blast-furnace slags
phosphorus
adsorption
desorption
soil
