不同pH值下制备烟酸根型水滑石的表征及氯离子吸附性能分析

doi:10.11896/cldb.24100141

材料导报

2025, Vol. 39

Issue (23): 24100141-7 https://doi.org/10.11896/cldb.24100141

无机非金属及其复合材料

不同pH值下制备烟酸根型水滑石的表征及氯离子吸附性能分析

林海孟, 温勇^*, 郭晓琦, 孙晓燕, 田沛丰

新疆大学建筑工程学院,乌鲁木齐 830017

Characterisation of Nicotinic Acid Root-type Hydrotalcites Prepared at Different pH Values and Analysis of Their Chloride Ion Adsorption Properties

LIN Haimeng, WEN Yong^*, GUO Xiaoqi, SUN Xiaoyan, TIAN Peifeng

School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, China

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摘要以天然镁铝水滑石为源、烟酸为改性剂,采用焙烧水化重构法制备了三种烟酸根型水滑石(LDHs-VB3),分析了溶液pH值对产物的物相、官能团、微观形貌的影响,研究了产物LDHs-VB3(pH=9.3)、LDHs-VB3(pH=10.3)和LDHs-VB3(pH=11.3)的比表面积、孔径分布及氯离子(Cl^-)吸附性能。结果表明,溶液pH值为11.3时,烟酸根离子(VB3^-)未嵌入水滑石层间,而当溶液pH值为9.3、10.3时,VB3^-明显嵌入水滑石层间。三者中,LDHs-VB3(pH=9.3)的层间距最大,其值为15.32 ,而LDHs-VB3(pH=10.3)的比表面积最大且结晶最好。它们的吸附过程均符合Langmuir等温线吸附模型,LDHs-VB3(pH=9.3)、LDHs-VB3(pH=10.3)和LDHs-VB3(pH=11.3)的最大Cl^-吸附量分别为23.847 mg/g、39.128 mg/g和29.200 mg/g,前两者主要通过离子交换和表面吸附两种方式吸附Cl^-,后者则主要以表面吸附方式为主。虽然它们的Cl^-吸附量小于CLDHs,但是前两者拥有释放VB3^-和吸附Cl^-的双重作用且具有良好的热稳定性,具有作为钢筋混凝土中钢筋缓蚀剂的潜能,为后续LDHs型缓蚀剂的设计和绿色开发提供了参考。

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关键词: 镁铝水滑石烟酸焙烧水化重构法 pH值氯离子吸附性能

Abstract: Three varieties of nicotinic acid root-typehydrotalcite (LDHs-VB3) were prepared by roasting hydration reconstruction method, employing natural magnesium-aluminium hydrotalcite as the source and nicotinic acid as the modifier. The effects of solution pH on the crystalline structure, functional groups and microscopic morphology of LDHs-VB3(pH=9.3), LDHs-VB3(pH=10.3) and LDHs-VB3(pH=11.3) were analyzed. Furthermore, the specific surface area, pore size distribution and chloride ion adsorption properties of these three LDHs-VB3 samples were investigated. The findings revealed that nicotinic acid anions (VB3^-) are not successfully intercalated into the LDH interlayer at a pH of 11.3, whereas significant intercalation is achieved at pH values of 9.3 and 10.3. Among the three samples, LDHs-VB3(pH=9.3) exhibits the largest interlayer spacing, measuring 15.32 . In contrast, LDHs-VB3(pH=10.3) demonstrates the highest specific surface area and optimal crystallization. Besides, all the samples’ adsorption processes follow the Langmuir isothermal adsorption model, and the maximum chloride adsorption of LDHs-VB3(pH=9.3), LDHs-VB3(pH=10.3) and LDHs-VB3(pH=11.3) are 23.847 mg/g, 39.128 mg/g and 29.200 mg/g, respectively. In addition, LDHs-VB3(pH=9.3) and LDHs-VB3(pH=10.3) adsorb chloride ions mainly by both ion exchange and surface adsorption, while LDHs-VB3(pH=11.3) primarily relies on surface adsorption. Although the Cl^- adsorption capacities of these three LDHs-VB3 samples are all lower than that of CLDHs, LDHs-VB3(pH=9.3) and LDHs-VB3(pH=10.3) possess the dual roles of releasing VB3^- and adsorbing Cl^- and exhibit good thermal stability, making them potential candidates as corrosion inhibitors for reinforcement bars in reinforced concrete. These findings provide a reference for the design and green development of the LDHs-type corrosion inhibitors.

Key words: Mg-Al hydrotalcite nicotinic acid roasted hydrated reconstruction method pH value chloride ion adsorption property

出版日期: 2025-12-10 发布日期: 2025-12-03

ZTFLH:

TU502

基金资助: 自治区厅厅联动重点研发计划项目绿色低碳建筑材料关键技术研究与应用(2022B03034-2);自治区“天山英才”科技创新领军人才(2023TSYCLJ0006);国家自然科学基金(52168036)

通讯作者: ^*温勇,新疆大学建筑工程学院教授、博士研究生导师。主要从事混凝土材料耐久性、固体废弃物综合处置利用技术等研究。wenyong_9731@ 126.com

作者简介: 林海孟,新疆大学建筑工程学院硕士研究生,在温勇教授的指导下进行研究。目前主要研究领域为金属腐蚀与防护等。

引用本文:

林海孟, 温勇, 郭晓琦, 孙晓燕, 田沛丰. 不同pH值下制备烟酸根型水滑石的表征及氯离子吸附性能分析[J]. 材料导报, 2025, 39(23): 24100141-7.
LIN Haimeng, WEN Yong, GUO Xiaoqi, SUN Xiaoyan, TIAN Peifeng. Characterisation of Nicotinic Acid Root-type Hydrotalcites Prepared at Different pH Values and Analysis of Their Chloride Ion Adsorption Properties. Materials Reports, 2025, 39(23): 24100141-7.

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https://www.mater-rep.com/CN/10.11896/cldb.24100141 或 https://www.mater-rep.com/CN/Y2025/V39/I23/24100141

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