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

Abstract

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

CLC Number:

O643.3

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

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