Novel p-n heterojunction photocatalyst constructed by porous graphite-like C3N4 and nanostructured BiOI: facile synthesis and enhanced photocatalytic activity.
In this work, n-type porous graphite-like C3N4 (denoted as p-g-C3N4) was fabricated and modified with p-type nanostructured BiOI to form a novel BiOI/p-g-C3N4 p-n heterojunction photocatalyst for the efficient photocatalytic degradation of methylene blue (MB). The results show that the BiOI/p-g-C3N4 heterojunction photocatalyst exhibits superior photocatalytic activity compared to pure BiOI and p-g-C3N4. The visible-light photocatalytic activity enhancement of BiOI/p-g-C3N4 heterostructures could be attributed to its strong absorption in the visible region and low recombination rate of the electron-hole pairs because of the heterojunction formed between BiOI and p-g-C3N4. It was also found that the photodegradation of MB molecules is mainly attributed to the oxidation action of the generated O2˙(-) radicals and partly to the action of h(vb)(+)via direct hole oxidation process.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China. dlj@ujs.edu.cn xiejm391@sohu.com.
Deli
D
Jiang
Linlin
L
Chen
Jianjun
J
Zhu
Min
M
Chen
Weidong
W
Shi
Jimin
J
Xie