水泥基硼掺杂石墨相氮化碳降解NO

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

摘要/Abstract

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

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

中图分类号:

O643.36

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.

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.

图/表 15

表1 水泥的主要化学成分

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

表2 水泥的主要物理指标

细度/%	烧失量/%	比表面积/m²·kg^-1
0.3	3.89	364

表3 粗骨料的级配设计表[26]

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

图1 自制光催化装置示意图1—NO气源；2—通气阀门；3—光催化装置箱；4—NO传感器；5—置物台；6—多孔混凝土试样；7—风扇；8—紫外可见灯管；9—玻璃转子计量器

表4 光催化降解实验参数

体积流量/L·min^-1	光照强度/W	相对湿度/%	检测时间
1	16	50	10min，共2h

图2 g-C3N4和BCN的SEM结果

图3 g-C3N4和BCN的XRD图谱

图4 改性前后的g-C3N4紫外可见漫反射光谱和荧光光谱

图5 改性前后g-C3N4的吸附-脱附等温线、孔径分布曲线和拟合直线

表5 改性前后g-C3N4比表面积

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

图6 光催化降解NO机理示意图

图7 g-C3N4和BCN对NO的光催化降解率

图8 掺杂g-C3N4和BCN的水泥混凝土试样的抗压强度

图9 紫外光照射条件下不同多孔水泥混凝土的光催化降解率随光催化剂掺杂量不同而产生的变化

图10 可见光照射条件下不同多孔水泥混凝土的光催化降解率随光催化剂掺杂量不同而产生的变化

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