摘要
采用静态与动态两种方法，探究了淀积层黄土中五氯酚钠（ PCP-Na）的吸附和解吸特性。结果表明， PCP-Na在淀积层黄土中的静态吸附平衡时间为2.5 h，吸附速率为21.4 mg/（ kg＆#183;h），吸附量为53.6 mg/ kg。pH 4~7，对淀积层黄土中 PCP-Na 的吸附有影响，但影响不大；氯化钠浓度0~0.4 mol/ L，PCP-Na 的吸附量与离子强度呈正比。在实验温度下，吸附等温线均为 L-型。淀积层黄土中 PCP-Na 的动态吸附结果表明，当流出液体积大于750 mL 时，PCP-Na 在土柱内的吸附达到饱和；吸附饱和的土柱放置2 h 以后，用蒸馏水解吸，当解吸液流出体积超过800 mL 时，流出液中几乎无 PCP-Na。由此可见，淀积层黄土对水溶性 PCP-Na 的滞留能力较差，PCP-Na 可轻易穿过黄土，对地下水造成不可避免地污染。
The adsorption / desorption properties and laws of PCP-Na in the loess have been ascertained by combination of static and dynamic method. The results showed that static adsorption time of PCP-Na in the loess is 2. 5 h,the adsorption rate is 21. 4 mg /（ kg ＆#183; h）and the constant of adsorption quantity is 53. 6 mg / kg. The adsorption quantity of sodium pentachlorophenol in the loess could be affected by pH in the range of 4 ~ 7,but not obviously. The concentration of NaCl in 0 ~ 0. 4 mol/ L,adsorption quantity of PCP-Na increases with the increase of ionic strength. Under all test temperatures,adsorption isotherm types are based on L-type,respectively. The results of dynamic adsorption showed that the adsorption quantity of PCP-Na reached saturation in the soil column,when the effluent volumes were greater than 750 mL. The adsorption saturated soil column were placed for 2 h before desorbed by distilled water. When the volumes of desorption were more than 800 mL,there was almost no PCP-Na in effluent. The lo-ess soil has not a function for the enrichment of PCP-Na penetrates the loess soil easily. Inevitably,the groundwater will be contaminated by the PCP-Na.
出处
《应用化工》
CAS
CSCD
2014年第5期880-882,886,共4页
Applied Chemical Industry
关键词
五氯酚钠
黄土性土壤
吸附
解吸
sodium pentachlorophenol
loessial soil
adsorption
desorption
