摘要
以聚酯纤维无纺布为支撑骨架,采用原位溶胶-凝胶法制备了高强度蛛网状多孔g-C_(3)N_(4)@纤维素气凝胶(CN@CA/PET)。借助场发射扫描电镜(FESEM)、傅里叶变换衰减全反射红外光谱(ATR-FT-IR)、热重分析(TG)和紫外-可见漫反射光谱(UV-Vis DRS)等手段对样品的物相组成、微观形貌和光学性质进行表征。以磺胺喹啉为目标降解物,在模拟太阳光源下研究了CN@CA/PET复合气凝胶的光催化活性。结果表明:聚酯纤维骨架的支撑大大提高了纤维素气凝胶的力学性能,其断裂强度是纯纤维素气凝胶的10倍,CN@CA/PET复合气凝胶降解2h的降解率为98.5%,与未负载的粉体石墨氮化碳(g-C_(3)N_(4))降解率相当(2h时98.8%)。且CN@CA/PET复合气凝胶具有优异的循环使用性和稳定性,在重复使用10次后,抗生素污染物去除率保持在93%以上。最后,光催化降解机理研究发现,在光催化过程中主要的活性基团是·O_(2)^(-)。
High strength porous cobweb-like g-C_(3)N_(4)@cellulose aerogel(CN@CA/PET)was prepared by in-situ sol-gel method using polyester nonwoven fabric as support framework.The samples were characterized by field emission scanning electron microscopy(FESEM),Fourier transform attenuated total reflection infrared spectroscopy(ATR-FT-IR),thermogravimetricanalysis(TGA)and UV-Vis diffuse reflection spectroscopy(UV-Vis DRS)in terms of their physical compositions,micromorphology and optical properties.The photocatalytic activity of CN@CA/PET composite aerogel was studied under simulated solar light source using sulfaquinoxaline as the target degradant.The results showed that the mechanical properties of cellulose aerogel were greatly improved by the support of polyester fiber framework,and its fracture strength of the composite aerogel was 10 times that of pure cellulose aerogel.The degradation efficiency of the composite aerogel was 98.5%at 2h,which was comparable to the degradation efficiency of unsupported powdered graphite carbon nitride(g-C_(3)N_(4))(98.8%at 2h).In addition,CN@CA/PET composite aerogel had excellent recyclability and stability.After repeated use for 10 times,the removal rate of antibiotic pollutants remained above 93%.Finally,it was found that the main active group in the photocatalytic degradation process·O_(2)^(-).
作者
李佳佳
周振壕
柯懂
陈淑君
Li Jiajia;Zhou Zhenhao;Ke Dong;Chen Shujun(Keyi College of Zhejiang Sci-Tech University,Shaoxing 312300)
出处
《化工新型材料》
北大核心
2025年第S1期344-348,355,共6页
New Chemical Materials
基金
浙江省自然科学基金/探索项目(LTGS24B070004)
关键词
纤维素气凝胶
石墨相氮化碳
聚酯纤维
光催化
抗生素
cellulose aerogel
graphiticcarbon nitride
polyester fiber
photocatalysis
antibiotic
作者简介
李佳佳(2003-),女,本科,研究方向为光催化净化材料,E-mail:3108889877@qq.com;通讯作者:陈淑君(1993-),实验师,E-mail:18868196155@163.com。
