泥炭对磷吸附特性的试验研究  

Experiment of the Phosphate Adsorption Characteristics by Peat

作　　者：曾鸿鹄[1,2] 张爱莉[3] 佟小薇[3] 纪锐琳[3] 王双飞[1] 朱义年[3] 李峰[3] 玉正红[3] 

机构地区：[1]广西大学轻工与食品工程学院 [2]桂林工学院广西环境工程与保护评价重点实验室,资源与环境工程系,广西桂林541004 [3]桂林工学院广西环境工程与保护评价重点实验室

出　　处：《桂林工学院学报》2008年第1期102-108,共7页Journal of Guilin University of Technology

基　　金：广西“新世纪十百千人才工程”专项资金资助项目(2004217);广西科学基金资助项目(桂科基0575103);广西研究生科技创新计划项目(2007105960830M23);广西科学研究与技术开发项目(桂科攻0632006-3B)

摘　　要：通过试验研究了吸附时间、磷初始浓度、pH值、温度、吸附剂量和盐度等因素对磷在泥炭上吸附的影响。结果表明：磷在泥炭上的吸附量在反应的初始阶段（0～2h）增加很快，此后趋于平缓；泥炭对磷的吸附过程遵循准二级动力学模型；随着磷初始浓度的增加，吸附量上升而吸附率下降；泥炭对磷的等温吸附可用Langmuir和Freundlich等温模型拟合，相关性均达到极显著水平（P〈0．01）；随着溶液pH值的升高，分配系数＆和吸附量均降低；泥炭对磷的最大吸附量随着温度的上升而减小，由Langmuir等温方程计算出的最大吸附量qm分别为：2380．95mg／kg（25℃）〉2008．03mg／kg（35℃）〉1848．42mg／kg（45℃）；随着吸附剂量的增加，吸附量下降而吸附率上升；盐度对吸附有一定的抑制作用。Effect of reaction time, initial concentration of PO4^3-, pH, temperature, amount of adsorbent and solution salinity on the phosphorus adsorption on peat is experimentally studied. The results indicate that the phosphorus adsorption capacity of peat increases rapidly at the beginning of the adsorption process （0 -2 h）, and then decreases slowly. The adsorption kinetics can be described by the pseudo-second order model. The adsorption capacity increases while the adsorption rate declines with the increasing initial PO4^3- concentration. The isothermal adsorption process of phosphate on peat can be fitted by Langrnuir and Freundlich equations with a high correlation coefficient. Both the distribution coefficient and the adsorption capacity decrease as pH increases. The maximal adsorption capacity decreases as the temperature increases in following order： 2 380. 95 mg/kg（25 ℃ ） 〉2 008.03 mg/kg（35 ℃ ） 〉 1 848.42 mg/kg（45 ℃ ）. As the adsorbent amount increasing, the unit adsorption capacity decreases and the adsorption rate increases. The adsorption can be influenced by salinity in a certain extent.

关 键 词：泥炭 磷 吸附等温线 吸附动力学 

分 类 号：X52[环境科学与工程—环境工程] X505