| 镉污染高岭土微观特性的试验研究 |
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| 引用本文： | 刘刚,张传成. 镉污染高岭土微观特性的试验研究[J]. 科学技术与工程, 2016, 16(4) |
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| 作者姓名： | 刘刚 张传成 |
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| 作者单位： | 武汉大学,武汉轻工大学土木工程与建筑学院 |
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| 摘 要： | 通过Batch平衡法制备试验样本,对不同浓度镉污染高岭土的微观孔容、孔径以及TG-DTA特性进行了试验研究。结果表明:随着样品镉污染浓度的增大,镉污染高岭土宽度为1~2 nm的孔隙占总孔容的比例较少;宽度为2~20 nm的孔隙占总孔容的比例增加。这是由于随着镉污染物浓度的增加,高岭土试样中产生了氢氧化镉或者碳酸镉沉淀阻塞了孔径。通过TG—DTA曲线得出随着污染物浓度的增大,样品中氢氧化物及碳酸盐的含量逐渐增高,这与低温氮吸附试验结果相吻合。
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| 关 键 词： | 吸附/解吸 热重 镉污染 微观特性 高岭土 |
| 收稿时间： | 2015-09-06 |
| 修稿时间： | 2016-01-22 |
Microstructure characteristics of Cadmium-contaminated kaolin |
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| Abstract: | An experimental investigation of microstructure characteristics of cadmium-contaminated kaolin is presented. The cadmium-contaminated kaolin are artificially prepared with various cadmium concentrations ( 0%,0.1%,0.3% and 0.5%).The results show that the increase of the initial cadmium concentration, the quantity of micropore with diameter of 1 to 2nm decreases, whereas that of micropore with diameter of 2 to 20nm increases. Through the TG-DTA curve, there is a new substance is formed, the hydroxyl and carbonate content is higher. |
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| Keywords: | Adsorption/Desorption Thermogravimetry Cadmium-contaminated Microstructure characteristics kaolin |
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