| 表面活性剂改性沸石对水中酚类化合物吸附性能研究 |
| 摘要点击 2596 全文点击 1474 投稿时间：2012-02-22 修订日期：2012-05-12 |
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| 中文关键词 粉煤灰 沸石 表面活性剂 吸附 酚 |
| 英文关键词 fly ash zeolite surfactant adsorption phenol chemicals |
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| 中文摘要 |
| 使用表面活性剂对2种粉煤灰合成沸石进行改性处理,研究改性沸石对酚类化合物(苯酚、对氯酚和双酚 A)的吸附特性. 吸附试验结果表明,合成沸石经过阳离子表面活性剂十六烷基三甲基溴化铵改性后,对酚类化合物的吸附性能均有大幅提升,吸附等温线模型均较符合 Langmuir模型. 2种改性沸石对酚类化合物(苯酚、对氯酚和双酚 A)的Langmuir理论最大吸附量分别可达 37.7、52.36、90.9 mg·g-1和 10.71、22.83、56.8 mg·g-1. 当溶液pH值高于酚类化合物的解离系数 pKa时,吸附效果随pH升高而增加. 结果还表明,酚类化合物的疏水性(辛醇/水分配系数 Kow)越强,改性沸石的吸附能力也越高. |
| 英文摘要 |
| Two kinds of zeolites were prepared from fly ash and modified by surfactant subsequently. Surfactant-modified zeolites were studied for adsorption of phenol chemicals (phenol, p-chlorphenol, bisphenol A). It showed that the adsorption affinity of zeolite to phenol chemicals was significantly improved after surfactant modification. The adsorption isotherms of phenol chemicals were well fitted by the Langmuir isotherm. For the two surfactant-surfactant modified zeolites, the maximum adsorption amounts of phenol, p-chlorphenol, and bisphenol A calculated from the Langmuir equation were 37.7, 52.36, 90.9 mg·g-1 and 10.7, 22.83, 56.8 mg·g-1, respectively. When pH values of solutions were higher than the pKa values of phenol chemicals, the removal efficiencies were getting higher with the increase of pH values. The octanol/water partition coefficient (Kow) was also found to be an important factor affecting adsorption of phenol chemicals by the modified zeolites. Higher Kow value, which means the greater hydrophobicity of the chemicals, resulted in a higher removal. |
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