摘要
为了解决隧道内部由于空气流通不畅,导致汽车排放尾气NO聚集所造成的污染问题。首先通过蒸发溶剂-原位热聚合法制备了B元素掺杂的富氮氮化碳(B/C_(3)N_(5))复合材料,B原子掺杂后并非取代N原子形成B—C键而是取代C原子形成B—N键。B掺杂后实现了光生载流子的高效分离,光生载流子荧光寿命延长,表现出良好的可见光NO去除活性,可见光照射2 h内NO去除率最高可达97.36%。以环氧树脂E-44作为成膜基质,B/C_(3)N_(5)复合材料作为活性中心,低表面能有机氟硅作为功能单体合成了自清洁乳液,通过喷涂法将乳液喷涂到混凝土表面形成B/CN自清洁涂层,涂层具备良好的超疏水和疏油性能,1.3%B/CN涂层的静态水接触角达到了160.2°。经过紫外光照射7 d,砂纸磨擦30次和水油冲击15次后涂层静态水接触角仍高于150.0°,涂层具备良好的耐久性。自清洁涂层具备优异的可见光去除NO活性,可见光照射2 h,1.3%B/CN涂层几乎将NO完全去除,去除率达到了99.98%,循环使用5次后仍保持了高于96.00%的NO去除活性,适用于隧道混凝土内壁降解去除汽车尾气有害NO气体。
In order to solve the problem of NO accumulation in automobile exhaust gas caused by poor air circulation in the tunnel,resulting in environmental pollution,B-doping nitrogen‑rich carbon nitride(B/C_(3)N_(5))composites were prepared by evaporation solvent in⁃situ thermal polymerization firstly.After B doping,B—N bonds were formed by replacing C atoms instead of replacing N atoms to form B—C bonds.After B doping,the efficient separation of photogenerated carriers was achieved,and the fluorescence lifetime of photogenerated carriers was extended,showing good visible light NO removal activity.The NO removal rate reached 97.36%within 2 h of visible light irradiation.A self‑cleaning emulsion was synthesized by using epoxy resin E-44 as a film‑forming matrix,B/C_(3)N_(5) composite material as an active center,and low surface energy organic fluorosilicone as a functional monomer.The emulsion was sprayed onto the surface of concrete by spraying method to form a B/CN self‑cleaning coating.The coating showed good superhydrophobic and oleophobic properties,and the static water contact angle of the 1.3%B/CN coating reached 160.2°.After 7 d of UV irradiation,the static water contact angle of the coating was still higher than 150°after 30 times of sandpaper abrasion and 15 times of water‑oil impact,and the coating showed good durability.The self‑cleaning coating showed excellent visible light NO removal activity.After 2 h of visible light irradiation,the 1.3%B/CN coating almost completely removed NO,and the removal rate reached 99.98%.After 5 cycles of use,the NO removal activity was still higher than 96.00%,which was suitable for the degradation of harmful NO gas from automobile exhaust on the inner wall of tunnel concrete.
作者
胡平平
何小志
HU Pingping;HE Xiaozhi(The Nine Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.,Guangzhou 511358,China)
出处
《无机盐工业》
北大核心
2025年第9期117-124,共8页
Inorganic Chemicals Industry
作者简介
胡平平(1985-),男,高级工程师,主要从事路桥隧道新型混凝土防护材料开发工作,E-mail:hupp198509@163.com。
