负载S-g-C3N4/MgAl-CLDH光催化砂浆的去污及水化性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 44-51.

负载S-g-C₃N₄/MgAl-CLDH光催化砂浆的去污及水化性能研究

林淑瑾¹, 罗盛洋², 熊晓立²

1.福州市建设工程质量监督站,福州 350007;
2.福州大学土木工程学院,福州 350108

收稿日期:2023-07-11 修订日期:2023-09-14 出版日期:2024-01-15 发布日期:2024-01-16
作者简介:林淑瑾(1975—),女,高级工程师。主要从事水泥混凝土材料研究和建筑工程质量监督管理。E-mail:770900765@qq.com

Decontamination and Hydration Performance of Photocatalytic Mortar Loaded with S-g-C₃N₄/MgAl-CLDH

LIN Shujin¹, LUO Shengyang², XIONG Xiaoli²

1. Fuzhou Construction Engineering Quality Supervision Station, Fuzhou 350007, China;
2. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China

Received:2023-07-11 Revised:2023-09-14 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

摘要： 本研究合成了硫掺杂氮化碳/煅烧镁铝水滑石(S-g-C₃N₄/MgAl-CLDH)新型光催化复合材料,通过内掺的方式将其负载在水泥砂浆上,并测试了光催化砂浆的氮氧化物(NO_x)降解性能和水化性能。结果表明,当光催化剂掺量小于5%(质量分数)时,S-g-C₃N₄/MgAl-CLDH掺量与砂浆的NO_x降解率成正比。当光催化剂掺量超过5%时,砂浆的NO_x降解性能开始下降。适量的S-g-C₃N₄/MgAl-CLDH使水泥早期(1 d)水化程度显著提升,过量的S-g-C₃N₄/MgAl-CLDH使水泥后期水化程度下降。当光催化剂掺量为7%时,水泥砂浆的28 d强度较对照组砂浆显著下降。此外,适量(3%)S-g-C₃N₄/MgAl-CLDH能够改善砂浆的28 d强度。

关键词: 光催化砂浆, g-C₃N₄, MgAl-CLDH, 氮氧化物降解, 抗压强度, 水泥水化

Abstract: In this study, a new type of photocatalytic composite material “sulfur-doped carbon nitride/calcined magnesium aluminum hydrotalcite (S-g-C₃N₄/MgAl-CLDH)” was synthesized and loaded on cement mortar through internal doping. The nitrogen oxide (NO_x) degradation and hydration performance of photocatalytic mortar were tested. The results show that when the photocatalyst dosage is less than 5% (mass fraction), the S-g-C₃N₄/MgAl-CLDH content is directly proportional to the NO_x degradation rate of mortar. When the photocatalyst dosage exceeds 5%, the NO_x degradation performance of mortar begins to decrease due to agglomeration. In addition, due to the nucleation effect of nanomaterials, the incorporation of an appropriate amount of S-g-C₃N₄/MgAl-CLDH significantly improves the early (1 d) hydration degree of cement. However, due to its water absorption and agglomeration phenomenon, excess S-g-C₃N₄/MgAl-CLDH reduces the later hydration degree of cement. When the photocatalyst dosage is 7%, the 28 d strength of cement mortar significantly decreases compared with the control mortar. In addition, an appropriate amount of S-g-C₃N₄/MgAl-CLDH (3%) can improve 28 d strength of mortar due to its micro-filling effect.

Key words: photocatalytic mortar, g-C₃N₄, MgAl-CLDH, nitrogen oxide degradation, compressive strength, cement hydration

中图分类号:

O643.3

林淑瑾, 罗盛洋, 熊晓立. 负载S-g-C₃N₄/MgAl-CLDH光催化砂浆的去污及水化性能研究[J]. 硅酸盐通报, 2024, 43(1): 44-51.

LIN Shujin, LUO Shengyang, XIONG Xiaoli. Decontamination and Hydration Performance of Photocatalytic Mortar Loaded with S-g-C₃N₄/MgAl-CLDH[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 44-51.

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负载S-g-C₃N₄/MgAl-CLDH光催化砂浆的去污及水化性能研究

Decontamination and Hydration Performance of Photocatalytic Mortar Loaded with S-g-C₃N₄/MgAl-CLDH

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