Bi_2O_3/g-C_3N_4复合光催化剂的合成及其可见光降解亚甲基蓝研究  

Synthesis of Bi_2O_3/g-C_3N_4 composites and photodegradation of methylene blue under visible-light irradiation

作　　者：黄立英[1] 李夜平[1] 李华明[1] 许晖[1] 徐远国[1] 程晓农[1] 

机构地区：[1]江苏大学,镇江212013

出　　处：《化工新型材料》2013年第11期105-107,共3页New Chemical Materials

基　　金：国家自然科学基金(21007021;21177050;21076099)

摘　　要：采用煅烧法合成Bi2O3/g-C3N4复合光催化剂。利用X射线衍射(XRD)、红外光谱(FT-IR)、紫外-可见漫反射(UV-Vis)和荧光光谱(PL)等手段对催化剂的结构和光学性能进行表征。结果表明:复合光催化剂由Bi2O3和g-C3N4组成,其在可见光区的吸收较Bi2O3和g-C3N4有所提高,荧光强度较g-C3N4有所降低。光催化亚甲基蓝结果显示:在可见光下照射3h,Bi2O3/g-C3N4(12.3%)光催化剂对亚甲基蓝的降解率达91%,表观降解速率常数(k)为0.74h-1,分别是Bi2O3和g-C3N4的4.1倍和2.4倍。Bi2O3/g-C3N4复合光催化剂具有比Bi2O3和g-C3N4更高的可见光催化活性。Novel g-C3N4/Bi2O3 composite photocatalysts were synthesized by a calcination method. The samples were characterized by X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR）, UV-vis diffuse reflection spectroscopy （DRS） and Photoluminescence （PL）. Compared with g-Ca N4 and Bi2O3, the composites showed enhanced ab- sorption in visible-light area. Compared with g-C3 N4, the PL signal of g-G3 N4/Bi2O3 was suppressed. The photocatalytic ac- tivity was evaluated in the degradation methylene blue （MB） aqueous solution. Results clearly showed that g-Ca N4/Bi2O3 at a g-C3 N4 weight content of 12.3 % presented the highest photocatalytic activity with a degradation rate of 0. 74h-1 , which was 4. 1 and 2. 4 times as high as that of Bi2O3 and g-Ca N4, repectively.

关 键 词：石墨型氮化碳 三氧化二铋 可见光 复合物 光催化剂 

分 类 号：X703[环境科学与工程—环境工程] O643.32[理学—物理化学]