摘要
通过静态土壤修复试验研究了土壤中Cr(Ⅵ)的吸附机制,研究了吸附时间、p H值和环境温度对吸附量和吸附率的影响。试验选用重铬酸钾作为污染物,选取垃圾堆存区1.5km以外0.5 m^1 m的粉质粘土,Cr6+的初始含量为200mg/kg。试验结果表明:吸附在90min时基本达到平衡,继续延长吸附时间有利于Cr(Ⅵ)的还原;提高p H值,土壤的吸附量降低,酸性条件下,土壤中的Cr(Ⅵ)主要以HCr O4存在,在碱性条件下,主要以Cr O42-存在且吸附量降低缓慢;温度升高,土壤的吸附量提高,利于土壤表面吸附Cr(VI)沿土壤微孔向其内部迁移。
Static soil restoration experiments are conducted on the major factors influencing the adsorption mechanism of Cr（ Ⅵ） by soil. The factors include the adsorption time,the p H value and the environment temperature. Potassium dichromate is chosen as the pollutant and initial concentration of Cr6 ＋in made up light clay which selects outside the landfill area 1. 5 km and 0. 5 m to 4 m deep was 200 mg/kg. The results show that the adsorption balance reaches in about 1 hours basically,and extending the adsorption time is beneficial to the reduction of Cr（ Ⅵ）. Soil adsorption quantity is reduced through improving the p H value. In acidic conditions,the Cr（ Ⅵ） mainly exists in HCr O4,but mainly exists in Cr O42-in alkaline conditions and adsorption decreases slowly. The adsorption quantity of soil can be improved by raising the temperature and can benefit the migration of Cr（ VI） absorbed in soil surface along the soil pores to its internal.
出处
《北华航天工业学院学报》
CAS
2016年第1期30-32,共3页
Journal of North China Institute of Aerospace Engineering
基金
河北省科技支撑计划(13963801D)
