Study on a Hydrogel for Adsorption of Chloride Ions in Cementitious Materials.
Study on a Hydrogel for Adsorption of Chloride Ions in Cementitious Materials.
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DOI：
10.3390/polym14102081
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发表时间：
2022-05-20
期刊：
影响因子：
5
通讯作者：
Chen, Wanyu
中科院分区：
文献类型：
--
作者：
Cao, Meng;Wu, Lili;Zhang, Guixia;Yang, Ying;Chen, Wei;Li, Qiu;Tang, Pei;Chen, Wanyu
海滨环境中的氯离子会对混凝土中的钢筋产生腐蚀，严重危害海滨结构的安全。水凝胶作为一种优良的吸附材料，在水处理领域得到了广泛的应用，但在胶凝材料中的应用却很少。以N，N-亚甲基双丙烯酰胺为交联剂，丙烯酰胺为单体，制备了聚丙烯酰胺-壳聚糖水凝胶（PAMC）。所制备的PAMC凝胶对模拟海水和模拟海砂环境中的氯离子均具有较好的吸附效果，PAMC-1（由2.5g丙烯酰胺和1%的N，N-亚甲基双丙烯酰胺制备）凝胶对模拟海水中氯离子的最大吸附量为55.53mg/g。PAMC凝胶在水溶液中的吸附行为符合Langmuir吸附等温式。对PAMC凝胶的组成和形态进行了表征，并研究了PAMC凝胶对环境的响应性。结果表明，PAMC在碱性环境中对凝胶的吸附效果更好，因此可以用于碱性水泥基环境。含PAMC-1凝胶的砂浆试样具有更高的抗氯离子渗透性，与不含凝胶的试样相比，养护28天的试样表面7.5- 10 mm处的氯离子含量降低了41.4%。
Chloride ions in the seaside environment can corrode the steel reinforcement in concrete, which greatly endangers the safety of seaside structures. As an excellent adsorption material, hydrogel is widely used in the field of water treatment but is rarely used in cementitious materials. In this study, a polyacrylamide–chitosan hydrogel (PAMC) was prepared with N,N-methylenebisacrylamide as the cross-linking agent and acrylamide as the monomer. The prepared PAMC gel could effectively adsorb chloride ions in simulated seawater and simulated sea sand environments, and the maximum adsorption capacity of chloride ions by PAMC-1 (prepared from 2.5 g acrylamide and 1% content of N,N-methylenebisacrylamide relative to acrylamide) gels in simulated seawater was 55.53 mg/g. The adsorption behavior of the PAMC gels in solution fit the Langmuir isotherm model. The composition and morphology of the PAMC gel were characterized, and the responsiveness of the PAMC gel to the environment was studied. The results showed that the PAMC gels adsorbed better in alkaline environments and thus could be used in alkaline cement-based environments. The mortar sample containing the PAMC-1 gel had higher resistance to chloride ion penetration, and the chloride ion content at 7.5–10mm from the surface of the sample cured for 28 days was reduced by 41.4% compared to the samples without the gel.
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