摘要
研究了页岩陶粒对水溶液中磷的等温吸附特征,考察了溶液磷初始浓度、吸附剂粒径和温度对吸附作用的影响,利用一级和准二级动力学模型对页岩陶粒吸附除磷动力学过程进行了分析。结果表明,页岩陶粒对磷的等温吸附特征符合Langmuir方程,最大磷吸附量为131.58mg/kg。溶液磷初始浓度越大,温度越高,页岩陶粒对磷的吸附量越大。随着吸附剂粒径的减小,一级动力学速率常数增大,吸附平衡时间缩短。尽管一级和准二级动力学模型都能反映不同条件下页岩陶粒的吸附除磷动力学过程,但相比较而言,准二级动力学对该过程的描述更为准确,由该模型估算出页岩陶粒对磷的平衡吸附量qe,其误差基本小于13.00%。
Adsorption isotherm and kinetics experiments were carried out to determine the effects of temperature, particle size and initial concentration on aqueous phase adsorption of phosphate on shale granules as a wetland construction material. The adsorption isotherm data were well represented by the Langmuir isotherm model with the maximum adsorption capacity of 131.58 mg P/kg. The adsorptive capacity increased with increasing initial phosphate concentration （6, 12 and 18 mg P/L） and temperature （5, 25 and 35 ℃ ）. Smaller particle size （30, 60 and 100 mesh sizes） resulted in a shorter time to reach the equilibrium state as well as a higher first-order rate constant. The highest capacities were observed using 60 mesh particles. The pseudo second-order kinetics was useful since it fitted the adsorption rate data better than the first order kinetics and that the calculated qe was a good estimate of the equilibrium isotherm capacity.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第3期182-185,共4页
Environmental Pollution & Control
基金
上海市科委重大科技攻关项目(No04DZ12029)
关键词
页岩陶粒
磷
吸附
动力学
Shale granules Phosphorus Adsorption Kinetics
