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One‐Step Synthesis of Bi 2 S 3 /BiOX and Bi 2 S 3 /(BiO) 2 CO 3 Heterojunction Photocatalysts by Using Aqueous Thiourea Solution as Both Solvent and Sulfur Source
Author(s) -
Zhang Keke,
Han Qiaofeng,
Wang Xin,
Zhu Junwu
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601364
Subject(s) - heterojunction , rhodamine b , photocatalysis , thiourea , materials science , photodegradation , aqueous solution , visible spectrum , nuclear chemistry , optoelectronics , chemistry , catalysis , organic chemistry
Bi 2 S 3 /BiOX (X=Cl and Br; respectively denoted as BS‐BC and BS‐BB) and Bi 2 S 3 /(BiO) 2 CO 3 (denoted as BS‐BOC) heterojunction photocatalysts were easily synthesized by one‐step method. In the reaction system, Bi(NO 3 ) 3 ⋅5H 2 O could be completely dissolved in aqueous thiourea solution, which homogeneously reacted with KCl, KBr and Na 2 CO 3 to form into uniformly mixed BS‐BC, BS‐BB and BS‐BOC composites, respectively. The Bi 2 S 3 content in the heterojunctions could be controlled by changing the reaction temperature, reaction time, thiourea amount and molar ratio of X/Bi or CO 3 /Bi. The as‐prepared photocatalysts exhibited enhanced photocatalytic activity for rhodamine B (RhB) degradation under visible light irradiation in contrast with the corresponding single compounds or the composites prepared via two‐step route. Excellent photocatalytic performance of the heterojunctions could be attributed to the increased visible light response, effective charge transfer from the modified band position and close interfacial contact due to well‐mixed heterojunction structures. Furthermore, unique flower‐like hierarchical BS‐BB presented the most significant increase in photodegradation efficiency for RhB and crystal violet (CV) among three composites.