Adsorption of PCP onto loess soil affected by adding corn burning residual
JIANG Yu-feng1, LIU Lan-lan1, YUAN Long-miao1, SHI Lei-ping1, MU Zhong-feng1, DIAO Jing-ru1, ZHAN Hui-ying2, WU Ying-qin3
1. Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 2. Chemical Engineering College, Lanzhou University of Arts and Science, Lanzhou 730000, China; 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract：In order to study the adsorption of environmental endocrine disrupters onto loess soil affected by adding straw burning residual, pentachlorophenol (PCP) was selected as the target pollutant, to explore the adsorption kinetics, desorption kinetics, adsorption thermodynamics, and influence factors, such as particle size, initial concentration, ionic strength, pH values, by batch adsorption experiments. The results showed that the present of burning residual could promote the adsorption amounts of PCP on loess soil, and adsorption kinetics was fitted well with Pseudo-second-order model. The adsorption thermodynamics was more in line with the Freundlich adsorption model, and the adsorption isotherm conformed to the C-type. At the temperature range of 25~45, the average adsorption free energy (E) of PCP℃ onto loess soil was less than 8kJ/mol, which indicates physical adsorption in the adsorption process. The adsorption free energy, such as Gibbs free energy, enthalpy and entropy were all less than zero, demonstrating a spontaneous adsorption process and the chaos degree of the system decreased. When the pH value between 3 and 7, the adsorption capacity of PCP decreased with the increase of pH values, and it was increase when the pH value between 7and 10. The adsorption capacity of PCP onto loess increased with the decrease of soil particle sizes. The adsorption capacity of PCP was increased with ion strength at the same ions situation, and when the concentration of ions is equal, the adsorption increases with the increase of the ion valence state.
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