| .三氯化铁改性有机膨润土包膜材料对六价铬的动态吸附[J].农业环境科学学报,2013,32(3):. |
| 三氯化铁改性有机膨润土包膜材料对六价铬的动态吸附 |
| Dynamic Adsorption of Hexavalent Chromium Onto Coated Materials with Organic Bentonite Modified by Ferric Trichloride |
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| DOI：10.11654/jaes.2013.03.035 |
| 中文关键词: 膨润土 包膜材料 动态吸附 六价铬 |
| 英文关键词: bentonite coated materials dynamic adsoption hexavalent chromium |
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| 摘要点击次数: 1687 |
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| 中文摘要: |
| 采用柱吸附方法研究三氯化铁改性有机膨润土的包膜材料对六价铬动态吸附，探究改性有机膨润土工程应用的可行性。改性有机膨润土粒径小，直接填充到吸附柱会增大压力损失，本试验以三氯化铁改性有机膨润土分别包膜活性炭和4A分子筛制成两种包膜材料，把包膜材料填充到吸附柱进行动态吸附、脱附和再生，收集并测定不同时刻流出液的六价铬浓度。结果表明，三氯化铁改性的有机膨润土可显著提高其对六价铬的吸附能力；两种包膜材料均可降低被吸附溶液在吸附柱内流通阻力，使动态吸附能够顺利进行；动态吸附过程符合修正的Thomas吸附模型；包膜材料很容易脱附再生，脱附再生后包膜材料吸附能力升高；包膜活性炭对六价铬吸附能力高于包膜4A分子筛。 |
| 英文摘要: |
| Column adsorption experiments were performed to determine dynamic adsorption of hexavalent chromium onto coated materials with organic bentonite modified by ferric trichloride, which would provide some basis for engineering application of modified material. Organic bentonite was modified by ferric trichloride to increase adsorption of hexavalent chromium on original organic bentonite. Pressure loss increased if modified material was directly filled in the column for small particle size, therefore activated carbon and 4A molecular sieve were coated with modified organic bentonite and the coated materials were filled in the adsorption column for dynamic adsorption, desorption and regeneration. The concentration of Cr（Ⅵ） in effluent was determined at different times. The results showed that organic bentonite modified by ferric tricholoride improved the adsorption ability of original organic bentonite for hexavalent chromium, and the two coated materials reduced the circulation resistance of solution in the adsorption column. The dynamic adsorption followed modified Thomas model. The coated materials were easily desorbed and regenerated and kept high adsorption after desorption and regeneration also. The adsorption ability of coated activated carbon was higher than that of coated 4A molecular sieve. |
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