The Highly Active Photocatalyst of Silver Orthophosphate under Visible Light Irradiation for Phenol Oxidation

Abstract:

Silver orthophosphate semiconductor was synthesized by the ion-exchange method using AgNO₃ and Na₂HPO₄.12H₂O as starting materials. The molar ratio of AgNO₃ and Na₂HPO₄.12H₂O was designed as 3:1. The product was characterized using XRD, SEM and DRS. The photocatalytic activity was determined using phenol oxidation under LED lamps with various wavelengths of visible lights such as 627nm (red), 530 nm (green) and 445 nm (blue). The body-centered cubic structure of silver orthophosphate with 1-10 μm in diameter was successfully synthesized. The band gap energy of the material could be found as 2.42 eV. The excellent photocatalytic activities of silver orthophosphate for phenol oxidation could be obtained under blue light (λ= 445nm) irradiation. The photocatalytic ability of Ag₃PO₄ under blue light irradiation was not lost even after heat treatment at 700°C.

• Periodical: Advanced Materials Research (Volume 896)
• Pages: 141-144
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.896.141
• Online since: February 2014
• Authors: Uyi Sulaeman*, Ima Rachmah Nisa, Anung Riapanitra, Ponco Iswanto, Shu Yin, Tsugio Sato
• Keywords: Bandgap Energy, Phenol, Photocatalyst, Silver Orthophosphate, Visible Light

References

[1] K. Naeem, F. Ouyang, Influence of supports on photocatalytic degradation of phenol and 4-chlorophenol in aqueous suspensions of titanium dioxide, J. Environ. Sci. 25 (2013) 399-404.

DOI: 10.1016/s1001-0742(12)60055-2

[2] H. Li, D. Wang, H. Fan, P. Wang, T. Jiang, T. Xie, Synthesis of highly efficient C-doped TiO2 photocatalyst and its photo-generated charge-transfer properties, J. Colloid and Interface Sci. 354 (2011) 175-180.

DOI: 10.1016/j.jcis.2010.10.048

[3] G. Yang, Z. Jiang, H. Shi, T. Xiao and Z. Yan, Preparation of highly visible-light active N-doped TiO2 photocatalyst, J. Mater. Chem. 20 (2010) 5301–5309.

DOI: 10.1039/c0jm00376j

[4] Y. H. Peng, G. F. Huang, W. Q. Huang, Visible-light absorption and photocatalytic activity of Cr-doped TiO2 nanocrystal films, Adv. Powder Technol. 23 (2012) 8-12.

DOI: 10.1016/j.apt.2010.11.006

[5] M. Batzill, E. H. Morales, U. Diebold, Influence of nitrogen doping on the defect formation and surface properties of TiO2 rutile and anatase, Phys. Rev. Lett. PRL 96 (2006) 026103.

DOI: 10.1103/physrevlett.96.026103

[6] Z. Yi, J. Ye, N. Kikugawa, T. Kako, S. Ouyang, H. Stuart-Williams, H. Yang, J. Cao, W. Luo, Z. Li, Y. Liu, R.L. Withers, An orthophosphate semiconductor with photooxidation properties under visible-light irradiation, Nat. Mater. 9 (2010) 559-564.

DOI: 10.1038/nmat2780

[7] Y. Bi, S. Ouyang, N. Umezawa, J. Cao, J. Ye, Facet effect of single-crystalline Ag3PO4 sub-microcrystals on photocatalytic properties, J. Am. Chem. Soc. 133 (2011) 6490–6492.

DOI: 10.1021/ja2002132

[8] C.T. Dinh, T.D. Nguyen, F. Kleitz, T.O. Do, Large-scale synthesis of uniform silver orthophosphate colloidal nanocrystals exhibiting high visible light photocatalytic activity, Chem. Commun. 47 (2011) 7797–7799.

DOI: 10.1039/c1cc12014j

[9] P. Y. Yu, M. Cardona, Fundamentals of semiconductors, Springer, Berlin, 1996, p.343.

[10] Y. Gao, Y. Masuda, and K. Koumoto, Band Gap Energy of SrTiO3 Thin film prepared by the liquid phase deposition method, J. Korean Ceram. Soc. 40 (2003) 213-218.

DOI: 10.4191/kcers.2003.40.3.213

[11] W. Liu, M. Wang, C. Xu, S. Chen, X. Fu, Ag3PO4/ZnO: An efficient visible-light-sensitized composite with its application in photocatalytic degradation of Rhodamine B, Mater. Res. Bull. 48 (2013) 106–113.

DOI: 10.1016/j.materresbull.2012.10.015