Open AccessIn situ synthesis of p-n (BiO)4CO3(OH)2/Bi2O2CO3 internal polarized heterojunction for improved visible light photocatalytic performance
Author(s) -
Zizhu Xu,
Fangfang Wang,
Jing Zhang,
Xuebing Chen,
Changdong Chen
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab62ec
Subject(s) - heterojunction , photocatalysis , scanning electron microscope , materials science , surface photovoltage , analytical chemistry (journal) , photosynthesis , chemistry , catalysis , optoelectronics , spectroscopy , physics , quantum mechanics , composite material , biochemistry , chromatography
P-n type (BiO) 4 CO 3 (OH) 2 /Bi 2 O 2 CO 3 internal polarized heterojunction was prepared via an in situ photosynthesis method and characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM),UV–vis diffuse reflectance spectra (UV–vis DRS) and surface photovoltage (SPV). The results indicate that phase transition process of β -Bi 2 O 3 → Bi 2 O 2 CO 3 → (BiO) 4 CO 3 (OH) 2 can be regulated by controlling the photosynthesis time. With increasing of reaction time, CO 3 2− in Bi 2 O 2 CO 3 structures is replaced by polar OH − , and the two-dimensional (2D) heterostructure of (BiO) 4 CO 3 (OH) 2 /Bi 2 O 2 CO 3 is fabricated. The photocatalytic activities of the junction were investigated by degradation of tetrachlorophenol (4-CP) under the visible light illumination. The enhanced photocatalytic activity of (BiO) 4 CO 3 (OH) 2 /Bi 2 O 2 CO 3 has been attributed to the synergetic effect between intrinsic internal electric field (IEF) and charge separation for a photocatalyst with p-n heterojunction structures. Moreover, h + and ·OH are proved working as the main active species for the degradation performence. It shows great potential in application for wastewater treatment.