Effective coupling of BiPO4/g-C3N4 hybrid composites in ciprofloxacin photodegradation

A BiPO4/g-C3N4 photoactive system has been prepared by means of a practical ultrasound-assisted procedure in aqueous medium. The obtained hybrid composites were widely characterized by X-ray powder diffraction, Fourier-transform infrared spectroscopy, UV–vis diffuse reflectance spectroscopy, scanning electron microscopy and N2 adsorption–desorption measurements. The photocatalytic features of the samples were examined through the degradation of orange G dye and ciprofloxacin antibiotic, where the higher photocatalytic performance for the degradation of both pollutants was achieved for the g-C3N4 with 1 wt% loading of BiPO4 (1-BiPO4 sample). To explain this outstanding performance, a possible mechanism involving the delocalization of the photogenerated charge carriers in the BiPO4/g-C3N4 system is discussed. Also, total organic carbon analysis and photocatalytic tests with radical scavengers were performed to elucidate the importance of the reactive oxidizing species during the photocatalytic process.

[1]  Jie Ren,et al.  Photocatalytic activity enhancement of modified g-C3N4 by ionothermal copolymerization , 2015 .

[2]  Xiaochao Zhang,et al.  A BiPO4/BiOCl heterojunction photocatalyst with enhanced electron-hole separation and excellent photocatalytic performance , 2015 .

[3]  Jing Cao,et al.  Ag3PO4 quantum dot sensitized BiPO4: A novel p–n junction Ag3PO4/BiPO4 with enhanced visible-light photocatalytic activity , 2013 .

[4]  Li Xu,et al.  Reactable ionic liquid induced homogeneous carbon superdoping of BiPO4 for superior photocatalytic removal of 4-chlorophenol , 2017 .

[5]  Yong Chen,et al.  Enhanced visible light photocatalytic activity and mechanism of BiPO4 nanorods modified with AgI nanoparticles , 2015 .

[6]  Suwen Liu,et al.  Synthesis of Mesoporous BiPO4 Nanofibers by Electrospinning with Enhanced Photocatalytic Performances , 2014 .

[7]  Jun Li,et al.  0D/2D Z-Scheme Heterojunctions of Bismuth Tantalate Quantum Dots/Ultrathin g-C3N4 Nanosheets for Highly Efficient Visible Light Photocatalytic Degradation of Antibiotics. , 2017, ACS applied materials & interfaces.

[8]  Hong Liu,et al.  Recent progress in design, synthesis, and applications of one-dimensional TiO2 nanostructured surface heterostructures: a review. , 2014, Chemical Society reviews.

[9]  L. Ting,et al.  Ultrasonic chemical synthesis of hybrid mpg-C3N4/BiPO4 heterostructured photocatalysts with improved visible light photocatalytic activity , 2017 .

[10]  R. Fernandes,et al.  Dependence of photocatalysis on charge carrier separation in Ag-doped and decorated TiO2 nanocomposites , 2016 .

[11]  Xinyong Li,et al.  Synthesis and characterization of BiPO4/g-C3N4 nanocomposites with significantly enhanced visible-light photocatalytic activity for benzene degradation , 2016 .

[12]  C. Saint,et al.  Recent developments in photocatalytic water treatment technology: a review. , 2010, Water research.

[13]  L. Torres-Martínez,et al.  Novel visible light-driven PbMoO4/g-C3N4 hybrid composite with enhanced photocatalytic performance , 2017 .

[14]  M. Ghaedi,et al.  Nanocomposites: Synthesis, characterization and its application to removal azo dyes using ultrasonic assisted method: Modeling and optimization. , 2017, Ultrasonics sonochemistry.

[15]  Abdul Wahab Mohammad,et al.  A review of ZnO nanoparticles as solar photocatalysts: Synthesis, mechanisms and applications , 2018 .

[16]  Limin Chang,et al.  Fabrication and efficient visible light-induced photocatalytic activity of Bi2MoO6/BiPO4 composite , 2015 .

[17]  S. Obregón,et al.  Nanocrystalline ErVO4 as a novel photocatalyst for degradation of organic compounds and solar fuels production , 2018, Journal of Materials Science: Materials in Electronics.

[18]  Ze Zhang,et al.  Facile synthesis of g-C3N4 nanosheets loaded with WO3 nanoparticles with enhanced photocatalytic performance under visible light irradiation , 2017 .

[19]  J. Herrmann,et al.  PHOTOCATALYTIC DEGRADATION OF VARIOUS TYPES OF DYES (ALIZARIN S, CROCEIN ORANGE G, METHYL RED, CONGO RED, METHYLENE BLUE) IN WATER BY UV-IRRADIATED TITANIA , 2002 .

[20]  A. Habibi-Yangjeh,et al.  Novel ternary g-C3N4/Fe3O4/Ag2CrO4 nanocomposites: magnetically separable and visible-light-driven photocatalysts for degradation of water pollutants , 2016 .

[21]  Chao Yao,et al.  A stable BiPO4/g-C3N4 nanosheet composite with highly enhanced visible light photocatalytic activity , 2018, Journal of Materials Science: Materials in Electronics.

[22]  M. Antonietti,et al.  A metal-free polymeric photocatalyst for hydrogen production from water under visible light. , 2009, Nature materials.

[23]  Zongping Shao,et al.  Nitrogen-doped simple and complex oxides for photocatalysis: A review , 2018 .

[24]  W. Ho,et al.  In situ construction of g-C3N4/g-C3N4 metal-free heterojunction for enhanced visible-light photocatalysis. , 2013, ACS applied materials & interfaces.

[25]  S. Obregón,et al.  Performance of the polymeric g-C3N4 photocatalyst through the degradation of pharmaceutical pollutants under UV–vis irradiation , 2016 .

[26]  T. Strathmann,et al.  Visible-light-Mediated TiO2 photocatalysis of fluoroquinolone antibacterial agents. , 2007, Environmental science & technology.

[27]  Xu Zhao,et al.  Controllable synthesis of graphitic carbon nitride nanomaterials for solar energy conversion and environmental remediation: the road travelled and the way forward , 2018 .

[28]  S. Obregón,et al.  Cascade charge separation mechanism by ternary heterostructured BiPO4/TiO2/g-C3N4 photocatalyst , 2016 .

[29]  Xiaoyong Wu,et al.  Ba5Ta4O15 nanosheet/AgVO3 nanoribbon heterojunctions with enhanced photocatalytic oxidation performance: hole dominated charge transfer path and plasmonic effect insight. , 2018 .

[30]  L. Torres-Martínez,et al.  Sonochemical synthesis of CaBi6O10 nanoplates: photocatalytic degradation of organic pollutants (ciprofloxacin and methylene blue) and oxidizing species study (h+, OH·, H2O2 and O2•‐) , 2017 .

[31]  B. Cheng,et al.  Direct evidence and enhancement of surface plasmon resonance effect on Ag-loaded TiO 2 nanotube arrays for photocatalytic CO 2 reduction , 2018 .

[32]  Yongfa Zhu,et al.  New type of BiPO(4) oxy-acid salt photocatalyst with high photocatalytic activity on degradation of dye. , 2010, Environmental science & technology.

[33]  L. Torres-Martínez,et al.  CTAB-assisted ultrasonic synthesis, characterization and photocatalytic properties of WO3 , 2015 .

[34]  Zhigang Chen,et al.  Facile fabrication of g-C3N4/BiPO4 hybrid materials via a reactable ionic liquid for the photocatalytic degradation of antibiotic ciprofloxacin , 2017 .

[35]  Yajun Wang,et al.  Dramatic Activity of C3N4/BiPO4 Photocatalyst with Core/Shell Structure Formed by Self‐Assembly , 2012 .

[36]  G. Xin,et al.  Pyrolysis Synthesized g-C3N4 for Photocatalytic Degradation of Methylene Blue , 2013 .

[37]  Rong Liu,et al.  Synthesis and excellent visible light photocatalysis performance of magnetic reduced graphene oxide/ZnO/ZnFe2O4 composites , 2017 .

[38]  X. Chang,et al.  Effective Charge Carrier Utilization in Photocatalytic Conversions. , 2016, Accounts of chemical research.

[39]  W. Ho,et al.  Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects , 2015 .