混凝土基非金属硼掺杂富氮氮化碳降解NO_(x)性能研究  

Study on NO_(x)degradation performance of concrete-based non-metallic boron doped nitrogen-rich carbon nitride

作　　者：史王芳 张永胜[2] SHI Wangfang;ZHANG Yongsheng(Shanxi Vocational College of Tourism,Taiyuan 030036,China;Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]山西旅游职业学院,山西太原030036 [2]太原理工大学,山西太原030024

出　　处：《无机盐工业》2025年第3期116-123,共8页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(51978437)。

摘　　要：为了解决氮氧化物(NO_(x))对环境造成的污染,通过蒸发溶剂-高温热聚合法制备了非金属硼掺杂富氮氮化碳(B/C_(3)N_(5))光催化材料,采用X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-vis DRS)、稳态荧光光谱(PL)和电化学交流阻抗谱(EIS)等技术对B/C_(3)N_(5)光催化材料的物相晶型、特征官能团、元素组成、光谱吸收范围和光电子-空穴重组等进行了表征。混凝土作为载体负载B/C_(3)N_(5)光催化材料(CBCN)应用于光催化降解NO_(x)。结果表明,非金属B的掺杂拓宽了光谱吸收范围、实现了高效的光生载流子分离、降低了电荷传质阻力,提高了光催化性能。B/C_(3)N_(5)表现出明显优于纯相C_(3)N_(5)的光催化降解NO_(x)性能,且具有良好的稳定性,非金属B掺杂量为3%(质量分数,下同)的B/C_(3)N_(5)光催化材料表现出最为优异的NO_(x)降解活性,NO_(x)的最高降解率达到了93.98%,循环使用5次后NO_(x)的降解率仍为92.94%。模拟太阳光照射120 min,养护周期分别为7 d和28 d的CBCN对NO_(x)光催化降解率最高达到了77.22%和84.27%。B/C_(3)N_(5)光催化材料掺杂量为6%时养护周期分别为7 d和28 d的CBCN的抗压强度最高,分别为8.29、13.96 MPa,B/C_(3)N_(5)光催化材料的掺杂有效提高了混凝土的抗压强度。In order to solve the pollution caused by nitrogen oxides(NO_(x))to the environment,non-metallic boron-doped nitrogen-rich carbon nitride(B/C_(3)N_(5))photocatalytic materials were prepared by evaporation solvent-high temperature thermal polymerization.The phase,characteristic functional groups,elemental composition,spectral absorption range and photoelectron-hole recombination of B/C_(3)N_(5)photocatalytic materials were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-vis DRS),steady-state fluorescence spectroscopy(PL)and electrochemical impedance spectroscopy(EIS).B/C_(3)N_(5)photocatalytic material(CBCN)was loaded on concrete as a carrier for photocatalytic degradation of NO_(x).The results showed that the doping of non-metallic B broadened the spectral absorption range,realized efficient photo-generated carrier separation,reduced the charge mass transfer resistance,and improved the photocatalytic performance.B/C_(3)N_(5)showed significantly better photocatalytic degradation of NO_(x)than pure C_(3)N_(5),and had good stability.The non-metallic B-doped 3%(mass fraction)B/C_(3)N_(5)photocatalytic material showed the most excellent NO_(x)degradation activity.The highest degradation rate of NO_(x)reached 93.98%,and the degradation rate of NO_(x)still reached 92.94%after 5 cycles.Within 120 min of simulated sunlight irradiation,the highest photocatalytic degradation rates of NO_(x)by CBCN with curing cycles of 7 d and 28 d reached 77.22%and 84.27%,respectively.When the doping amount of B/C_(3)N_(5)photocatalytic material was 6%(mass fraction),the compressive strength of CBCN with curing period of 7 d and 28 d was the highest,which was 8.29 and 13.96 MPa,respectively.The doping of B/C_(3)N_(5)photocatalytic material effectively improved the compressive strength of concrete.

关 键 词：B/C_(3)N_(5) 混凝土 光催化 氮氧化物 抗压强度 

分 类 号：TQ128.1[化学工程—无机化工]