用户名: 密码: 验证码:
改性g-C_3N_4纳米材料的制备及其在光催化降解中的应用
详细信息    查看官网全文
摘要
石墨相氮化碳(g-C3N4)是一种新型光催化材料,因其具有合适的带隙宽度及可见光吸收性能[1],而备受科研人员的青睐。然而,单一g-C3N4材料的光生电子-空穴对具有较高的复合率,限制了其光催化活性,成为其广泛应用的技术瓶颈。为了提高g-C3N4的光催化活性,已有大量关于g-C3N4及其衍生物合成的文献报道[2]。本实验通过水热-共沉淀法合成了g-C3N4改性纳米材料,采用透射电镜(TEM)、X-射线衍射(XRD)、傅里叶红外光谱(FT-IR)、热重分析(TG)等分析手段对材料进行了表征。以3,4-二氯酚(3,4-DCP)为目标污染物,研究了改性纳米材料的光催化活性;考察了催化剂各组分质量比、催化剂投加量、3,4-DCP初始浓度、体系pH和盐度等对改性纳米材料催化活性的影响,在优化的实验条件下,3,4-DCP的降解率可达90.35%。
Graphite carbon nitride(g-C3N4) is a new photocatalytic materials.It has aroused many researchers' attentions due to suitable band gap and visible light absorption properties.However,the material has higher recombination rate of photo-generated electron-hole pairs,which decreases its photocatalytic activity.In order to improve the photocatalytic properties of g-C3N4,plenty of work has been reported about the synthesis of g-C3N4 modified materials.The g-C3N4 modified nanomaterial was synthesized by hydrothermal-coprecipitation method.It was characterized by transmission electron microscopy(TEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),and thermal gravimetric analysis(TG).Photocatalytic activity of the nanomaterial was studied with 3,4-dichlorophenol(3,4-DCP) as the target pollutant.The different degradation conditions,such as the material proportion,the amount of catalyst,the initial concentration of 3,4-DCP,pH and salinity,were investigated.The results showed that the removal efficiency of 3,4-DCP was 90.35% under the optimized experimental conditions.
引文
[1]Huang,Z.;Li,F.;Chen,B.Appl.Catal.B.2013,136-137:269-277.
    [2]Dong,F.;Wang,Z.Y.;Sun,Y.J.J.Colloid Interface Sci.2013,401:70-79.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700