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首页> 美国卫生研究院文献>Materials >Study on Adsorption Properties of Calcined Mg–Al Hydrotalcite for Sulfate Ion and Chloride Ion in Cement Paste
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Study on Adsorption Properties of Calcined Mg–Al Hydrotalcite for Sulfate Ion and Chloride Ion in Cement Paste

机译：水泥浆中钙离子和氯离子煅烧Mg-Al水滑石的吸附性能研究

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In the marine environment, sulfate ions and chloride ions are abundant. Therefore, sulfate attack and chloride ion attack are common failure forms of marine concrete. Mg–Al hydrotalcite is a layered bimetallic hydroxide, which can be used as guest molecular adsorbent. In this experiment, we synthesized Mg–Al hydrotalcite, and the crystal state, surface morphology, and composition of this adsorbent were investigated by modern micro-analysis technology. Mg–Al hydrotalcite was added into the prepared target ion solution, to explore the influence of various factors on the adsorption performance of Mg–Al hydrotalcite, and then calcined Mg–Al hydrotalcite was added into cement paste, to study the mechanical properties and durability of the paste samples. The experimental results show that the optimum conditions for adsorption of chloride ions by calcined Mg–Al hydrotalcite are an adsorption time of 4 h, temperature of 35 °C, LDO (calcined Mg-Al hydrotalcite) dosage of 3.5 g/L, and a pH of 8. The adsorption effect of sulfate ion is best when the adsorption time is 6 h, the temperature is 35 °C, the dosage of LDO is 4 g/L, and the pH = 8. The optimal adsorption conditions of calcined Mg–Al hydrotalcite for chloride ion and sulfate ion are not completely the same, and the adsorption of these two ions in mixed solution shows competitive adsorption. Compared with the common paste specimens without Mg–Al hydrotalcite, the mechanical properties and deformation properties of cement specimens can be significantly improved by adding Mg–Al hydrotalcite.
机译：在海洋环境中，硫酸根离子和氯离子是丰富的。因此，硫酸盐攻击和氯离子攻击是普通失效形式的海洋混凝土。 Mg-Al水滑石是层状双金属氢氧化物，可用作客体分子吸附剂。在该实验中，通过现代微分析技术研究了晶体状态，表面形态，该吸附剂的晶体状态，表面形态和组成。将Mg-Al水滑石加入到制备的靶离子溶液中，以探讨各种因素对Mg-Al水滑石的吸附性能的影响，然后将煅烧的Mg-Al水滑石加入水泥浆料中，以研究机械性能和耐久性。糊状样品。实验结果表明，通过煅烧Mg-Al水滑石吸附氯离子的最佳条件是4小时，温度为35℃，LDO（煅烧Mg-Al水滑石）剂量为3.5g / L的吸附时间，以及3.5g / L的剂量，以及pH为8.当吸附时间为6小时时，硫酸根离子的吸附效果最佳，温度为35℃，LDO的剂量为4g / L，pH = 8.煅烧Mg的最佳吸附条件 - 氯离子和硫酸根离子的水滑石不是完全相同的，并且在混合溶液中对这两离子的吸附显示出具有竞争性的吸附。与没有Mg-Al水滑石的常见糊状物相比，通过加入Mg-Al水滑石可以显着改善水泥样品的机械性能和变形性能。

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