Electrokinetic desalination of glazed ceramic tiles
Electrokinetic desalination of glazed ceramic tiles
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釉面瓷砖电动脱盐
DOI：
10.1007/s10800-010-0086-x
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
I. V. Christensen
中科院分区：
文献类型：
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作者：
L. Ottosen;C. Ferreira;I. V. Christensen
电动海水淡化是一种以外加直流电场为驱动力来去除多孔建筑材料中盐分的方法。本文对该方法进行了小试，并对单一瓷砖进行了脱盐试验。在一个模型系统中，瓷砖在浸没过程中被氯化钠污染，然后通过该方法进行淡化，淡化的完成是因为高的和有问题的初始Cl−浓度被降低到一个没有问题的浓度。进一步的电导率测量表明，处理后的瓷砖中的电导率非常低，这表明从电极处的膏体向瓷砖提供的离子是有限的。当达到低离子含量时，可以看到水的电渗透传输。还对十八世纪的瓷砖进行了试验，这些瓷砖是在翻修期间从里斯本森特诺宫(Palacio Centeno)移走的，因为盐的存在损坏了玻璃。这些瓷砖受到氯化物和硝酸盐的严重污染，其中一块瓷砖也含有硫酸盐，尽管浓度很低。在实验中，电荷转移太低，不能完全脱盐，但取得了令人满意的结果，显著降低了(>；81%Cl−，~59%NO3−和~22%SO42−)。
Electrokinetic desalination is a method where an applied electric DC field is the driving force for removal of salts from porous building materials. In the present paper, the method is tested in laboratory scale for desalination of single ceramic tiles. In a model system, where a tile was contaminated with NaCl during submersion and subsequently desalinated by the method, the desalination was completed in that the high and problematic initial Cl−concentration was reduced to an unproblematic concentration. Further conductivity measurements showed a very low conductivity in the tile after treatment, indicating that supply of ions from the poultice at the electrodes into the tile was limited. Electroosmotic transport of water was seen when low ionic content was reached. Experiments were also conducted with XVIII-century tiles, which had been removed from Palacio Centeno (Lisbon) during renovation due to damage of the glazing from the presence of salts. These tiles were severely contaminated with both chlorides and nitrates, and one of the tiles also contained sulphates though at a low concentration. The charge transfer was too low in the experiments to obtain full desalination, but promising results were obtained as significant decreases (>81% Cl−, ~59% NO3−and ~22% SO42−) were seen.