Cement-based boron-doped graphite phase carbon nitride material degrades NO

doi:10.16085/j.issn.1000-6613.2023-1264

Abstract

Abstract:

Boron doping modification graphite carbon nitride (BCN) was prepared by high temperature calcination of graphite carbon nitride (g-C₃N₄) and boron oxide (B₂O₃), and its microstructure, morphology and optical properties were characterized. The mechanical properties and photocatalytic degradation of NO of cement-based materials doped with g-C₃N₄ and BCN were studied by using porous cement concrete as photocatalyst carrier. The results showed that the introduction of B element increased the specific surface area of g-C₃N₄ and improved the absorption of visible light. The degradation rate of NO reached 40.7%. When the content reached 6% of cement content, the 7d strength and 28d strength of cement concrete were the best as 8.25MPa and 14.4MPa, respectively. Under visible light conditions, the photocatalytic degradation performance of 7d and 28d were the best, which were 47% and 63%, respectively.

Key words: photocatalysis, graphite phase carbon nitride, doping modification, degrading NO, cement concrete

摘要：

通过对石墨相氮化碳（g-C₃N₄）和氧化硼（B₂O₃）进行高温煅烧制备硼元素掺杂改性石墨相氮化碳（BCN），对其微观结构、形貌和光学特性进行表征。再以多孔水泥混凝土为光催化剂载体，研究掺杂g-C₃N₄和BCN的水泥基材料的力学性能和光催化降解NO性能。结果表明，B元素的引入会增大g-C₃N₄比表面积，改善水泥基材料对可见光的吸收，对NO的降解率达到40.7%。当掺杂BCN的质量分数达到水泥的6%时，水泥混凝土的7d抗压强度和28d抗压强度均达到最佳，分别为8.25MPa和14.4MPa；在可见光照射条件下，7d和28d光催化降解性能均达到最佳，分别为47%和63%。

关键词: 光催化, 石墨相氮化碳, 掺杂改性, 降解NO, 水泥混凝土

CLC Number:

O643.36

FU Tao, LI Li, GAO Lining, ZHU Fuwei, CAO Weiye, CHEN Huaxin. Cement-based boron-doped graphite phase carbon nitride material degrades NO[J]. Chemical Industry and Engineering Progress, 2024, 43(8): 4403-4410.

付涛, 李立, 高莉宁, 朱富维, 曹炜烨, 陈华鑫. 水泥基硼掺杂石墨相氮化碳降解NO[J]. 化工进展, 2024, 43(8): 4403-4410.

Figures/Tables 15

References 30

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化学成分	质量分数/%
CaO	62.21
SiO₂	21.55
Al₂O₃	7.82
Fe₂O₃	4.51
SO₃	2.11
MgO	1.80

化学成分	质量分数/%
CaO	62.21
SiO₂	21.55
Al₂O₃	7.82
Fe₂O₃	4.51
SO₃	2.11
MgO	1.80

筛孔/mm	通过率/%
2.36	0
4.75	6.5
9.50	85.7
13.00	100.0

筛孔/mm	通过率/%
2.36	0
4.75	6.5
9.50	85.7
13.00	100.0

样品	比表面积/m²·g^-1
g-C₃N₄	4.8820
BCN	5.7249