Adsorption and desorption characteristics of arsenic on soils:kinetics,equilibrium, and effect of Fe(OH)3 colloid, H2SiO3 colloid and phosphate
Adsorption and desorption of arsenic on different soils may affect the mobility,toxicity and bioavailability of arsenic in soil meia.In this study,laboratory batch experiments were carried out to study the adsorption and desorption of arsenic in three soils in China with different physicochemical properties.The results show that the adsorption was relatively fast for Beijing soil and Hainan soil,the reactions almost completed within the first few hours,while it was relatively slow for Jilin soil.The adsorption isotherms for three soils fitted very well to both the Langmuir and Freundlich models.The content of organic mater in the soils was of the major factor to determine the adsorption capacity.The thermodynamic parameters for the adsorption of arsenic were determined at three different temperatures of 283 K,303 K and 323 K.The adsorption reactions were endothermic and the process of adsorption was favored at high temperature.The adsorption behavior of arsenic on soils was strongly dependent on the concentrations of Fe(OH)3 and H2SiO3 colloid.Phosphate suppressed the adsorption of arsenite and arsenate,especially for BJ soil.The desorption data showed that desorption hysteresis occurred at the concentration studied.These findings improve our knowledge in modeling arsenic adsorption to common soil minerals.
Adsorption Desorption Arsenic Soil
Qinzhong Feng Zhiyong Zhang Yang Chen Liyuan Liu Zhengjie Zhang Chaozhong Chen
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China Shenyang Academy of Environmental Sciences, Shenyang 110016, China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
20-27
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）