| 孔秀,刘耀驰.化学通报,2015,78(12):1138-1144. |
| 土壤中正丁基黄原酸钾与铅离子的吸附特性研究 |
| Adsorption characteristic of potassium butyl xanthate and lead ion in soil |
| 投稿时间：2015-04-17 修订日期：2015-07-01 |
| DOI： |
| 中文关键词: 土壤 黄药 铅 复合污染 |
| 英文关键词:soil potassium butyl xanthate lead co-contamination |
| 基金项目:环保公益性行业科研专项 |
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| 中文摘要: |
| 通过静态试验研究了土壤对正丁基黄原酸钾(黄药)的吸附性能和影响因素,以及正丁基黄原酸钾?铅复合污染体系的吸附平衡与动力学特征。实验结果表明, 土壤对黄药的吸附过程遵循Lagergren二级动力学模型,等温吸附可用Freundlich模型拟合,提高温度有利于吸附,土壤对黄药的吸附属于内扩散控制过程；土壤吸附黄药最佳pH范围为5~9,pH较低时黄药易被酸解,碱性环境( pH>10)将抑制土壤对黄药的吸附；黄药与Pb2+形成难溶络合物而严重影响了Pb2+在土壤中的吸附,使Pb2+的吸附速率常数由38.319 g/(mg.min)提高到70.350 g/(mg.min),平衡吸附量(qe)由1.909 mg/g 降低到1.385 mg/g,且影响程度随着Pb2+浓度的升高而减弱。 |
| 英文摘要: |
| Adsorption characteristic and influence factors of potassium butyl xanthate to soil were investigated by static adsorption experiments. The adsorption equilibrium and kinetics of potassium butyl xanthate-lead combined pollutants were studied in detail. Results indicated that the adsorption kinetics could be described by Lagergren second-order model and the isotherm was well fitted by Freundlich equations. Increasing the temperatures rises is beneficial to the adsorption of butyl xanthate. The degradation of potassium butyl xanthate is rapidly increased with decreasing pH at pH<5. At pH 5-9, it helps the process of adsorption, but at pH>10 it suppresses the process. Adsorption of Pb2 to soil is seriously affected in the presence of potassium butyl xanthate owing to a suspended product of the reaction between Pb2 and potassium butyl xanthate, adsorption rate constant increases from 38.319 g/(mg.min) to 70.350 g/(mg.min), while equilibrium adsorption capacity (qe) decreases from 1.909 mg/g to 1.385 mg/g. The impact degree reduces with the increase of Pb2 concentration. |
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