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An Overview on the Photocatalytic Degradation of Organic Pollutants in the Presence of Cerium Oxide (CeO2) Based Nanoparticles: A Review

Considerable efforts have been devoted to enhancing the photocatalytic activity and solar energy utilization of photocatalysts. Photocatalysis has attracted much attention in recent years due to its potential in solving energy and environmental issues. The fabrication of various materials (coupled or doped) to form heterojunctions provides an effective way to better harvest solar energy and to facilitate charge separation and transfer, thus enhancing the photocatalytic activity and stability. Efficient light absorption and charge separation are two of the key factors for the exploration of high performance photocatalytic systems, which is generally difficult to be obtained in a single photocatalyst. In this review, we briefly summarizes the recent development heterostructured semiconductors, including the preparation and performances of semiconductor/semiconductor junctions, semiconductor/metal junctions, and their mechanism in the area of environmental remediation and water splitting for enhanced light harvesting and charge separation/transfer, describe some of the progress and resulting achievements, and discuss the future prospects. The scope of this review covers a variety of type photocatalysts, focusing particularly on Ceria (CeO2) heterostructured photocatalysts. We expect this review to provide a guideline for readers to gain a clear picture of fabrication and application of different type heterostructured photocatalysts.

Nanotechnology, AOPs, Nanoparticle, Ceria, Heterostructure, Photocatalyst, Coupling

APA Style

Tigabu Bekele Mekonnen. (2021). An Overview on the Photocatalytic Degradation of Organic Pollutants in the Presence of Cerium Oxide (CeO2) Based Nanoparticles: A Review. Nanoscience and Nanometrology, 7(1), 14-26.

ACS Style

Tigabu Bekele Mekonnen. An Overview on the Photocatalytic Degradation of Organic Pollutants in the Presence of Cerium Oxide (CeO2) Based Nanoparticles: A Review. Nanosci. Nanometrol. 2021, 7(1), 14-26. doi: 10.11648/j.nsnm.20210701.12

AMA Style

Tigabu Bekele Mekonnen. An Overview on the Photocatalytic Degradation of Organic Pollutants in the Presence of Cerium Oxide (CeO2) Based Nanoparticles: A Review. Nanosci Nanometrol. 2021;7(1):14-26. doi: 10.11648/j.nsnm.20210701.12

Copyright © 2021 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1. Han, F, Kambala, V. S. R, Srinivasan, M, Rajarathnam, D. and Naidu, R. 2009. Tailored titanium dioxide photocatalysts for the degradation of organic dyes in wastewater treatment: A review. Applied Catalysis A, 359: 25-40.
2. Gogate, P. R. and Pandit, A. B. 2004. A review of imperative technologies for wastewater treatment I: oxidation technologies at ambient conditions. Advance in environmental research, 8: 501-551.
3. Chen, H. and Zhao, J. 2009. Adsorption study for removal of Congo red anionic dye using organo-attapulgite. Adsorption, 15 (4): 381-389.
4. Ong, S. T., Keng, P. S., Lee, W. N., Ha, S. T. and Hung, Y. T. 2011. Dye waste water treatment. Water review 3: 157-176.
5. Huo, S. H. and Yan, X. P. 2012. Metal-organic framework MIL-100 (Fe) for the adsorption of malachite green from aqueous solution. Journal of Materials Chemistry, 22: 7449-7455.
6. Brown, M. A. and De Vito, S. C. 1993. Predicting azo dye toxicity. Critical Reviews in Environmental Science and Technology, 23: 249-324.
7. Kornaros, M. and Lyberatos, G. 2006. Biological treatment of wastewaters from a dye manufacturing company using a trickling filter. Journal of Hazardous Material, 136: 95 102.
8. Chen, C., Ma, W. and Zhao, J. 2010. Semiconductor-mediated photodegradation of pollutants under visible-light irradiation. Chemical Society Reviews, 39 (11): 4206-4219.
9. Kubacka, A., Fernandez-Garcia, M. and Colon, G. 2011. Advanced nano-architectures for solar photocatalytic applications. Chemical Reviews, 112 (3): 1555-1614.
10. Dolbecq, A., Mialane, P., Keita, B. and Nadjo, L. 2012. Polyoxometalate-based materials for efficient solar and visible light harvesting: application to the photocatalytic degradation of azo dyes. Journal of Materials Chemistry, 22 (47): 24509-24521.
11. Fan, W., Zhang, Q. and Wang, Y. 2013. Semiconductor-based nanocomposites for photocatalytic H2 production and CO2 conversion. Physical Chemistry Chemical Physics, 15 (8): 2632-2649.
12. Anandan, S., Vinu, A., Mori, T., Gokulakrishnan, N., Srinivasu, P., Murugesan, V. and Ariga, K. 2007. Photocatalytic degradation of 2, 4, 6-trichlorophenol using lanthanum doped ZnO in aqueous suspension. Catalysis Communications, 8 (9): 1377-1382.
13. Hoffmann, M. R., Martin, S. T., Choi, W. and Bahnemann, D. W. 1995. Environmental applications of semiconductor photocatalysis. Chemical Reviews, 95 (1): 69-96.
14. Asahi, R., Morikawa, T., Ohwaki, T., Aoki, K. and Taga, Y. 2001. Visible-light photocatalysis in Nitrogen-Doped Titanium Oxides. Science, 293: 269-271.
15. Bi, Y., Ouyang, S., Cao, J. and Ye, J. 2011. Facile synthesis of rhombic dodecahedral AgX/Ag3PO4 (X=Cl, Br, I) heterocrystals with enhanced photocatalytic properties and stabilities. Physical Chemistry Chemical Physics, 13 (21): 10071-10075.
16. Montini, T., Gombac, V., Hameed, A., Felisari, L., Adami, G. and Fornasiero, P. 2010. Synthesis, characterization and photocatalytic performance of transition metal tungstates. Chemical Physics Letter, 498: 113-119.
17. Bi, Y., Hu, H., Ouyang, S., Lu, G., Cao, J. and Ye, J. 2012. Photocatalytic and photoelectric properties of cubic Ag3PO4 sub-microcrystals with sharp corners and edges. Chemical Communications, 48 (31): 3748-3750.
18. Ran, J., Yu, J. G. and Jaroniec, M. 2011. Ni(OH)2 modified CdS nanorods for highly efficient visible-light-driven photocatalytic H2 generation. Green Chemistry, 13: 2708-2713.
19. Wang. Y., Xiuli., Wan, Y. and Fan, C. 2013. Novel visible-light AgBr/Ag3PO4 hybrid’s photocatalysts with surface plasma resonance effects. Journal of Solid State Chemistry, 2002: 51-56.
20. Wang, H., Zhang, L., Chen, Z., Hu, J., Li, S., Wang, Z., Liu, J. and Wang, X. 2014. Semiconductor heterojunction photocatalysts: design, construction, and photocatalytic performances. Chemical Society Reviews, 43: 5234-5244.
21. Dana, D., Vlasta, B., Mazur, M. and Malati, M. A. 2002. Investigations of metal-doped titanium dioxide photocatalysts. Applied Catalysis, 37: 91-105.
22. Liu, Y., He, L., Mustapha, A., Li, H., Hu, ZQ., Lin, M. 2009. Antibacterial activities of zinc oxide nanoparticles against Escherichia coli. Journal of Applied Microbiology, 015 (107): 1193-1201.
23. Zhang, M., An, T., Liu, X., Hu, X., and Sheng, G. 2010. Rapid large scale preparation of ZnO nanowires for photocatalytic application. Journal of Nanoscale Research Letters, 64: 1883-1886.
24. Tesfay, Wolderufael., O. P., Yadav, and Abi M, Taddesse, 2013. Synthesis, characterization and photocatalytic activity of AgN-codoped ZnO nanoparticles towards methyl red degradation. Bulletin Chemical Society of Ethiopia, 27: 221-232.
25. Alebel, Nibret, O. P., Yadav., Isabel, Diaz, and Abi M, Taddesse, 2015. Cr-N Co-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity for degradation of Thymol blue. Bulletin Chemical Society Ethiopia, 29 (2): 247-258.
26. Haile Hasana, Abi Tadesse. and Tesfahun Kebede. 2015. Synthesis, characterization and photocatalytic activity of MnO2/Al2O3/Fe2O3 nanocomposite for degradation of malachite green. African Journal of Pure and Applied Chemistry, 9 (11): 211-222.
27. Shamaila, S., Sajjad, A. K. L., Chen, F. and Zhang, J. 2011. WO3/BiOCl a novel heterojunctions visible light photocatalyst. Journal of colloids and interface Science, 356: 465-472.
28. Stylidi, M., Kondarides, D. I. and Verykios, X. E. 2004. Visible light-induced photocatalytic degradation of Acid Orange 7 in aqueous TiO2 suspensions. Applied Catalysis B: Environmental, 47 (3): 189-201.
29. Colmenares, J. C., Aramendia, M. A., Marinas, A., Marinas, J. M. and Urbano. F. J. 2006. Synthesis, characterization and photocatalytic activity of different metal doped Titania systems. Applied Catalysis, 306: 120-127.
30. Curco, D., Gimenez, J., Addardak, A., Cervera-March, S. and Esplugas, S. 2002. Effects of radiation absorption and catalyst concentration on the photocatalytic degradation of pollutants. Catalysis Today, 76: 177-188.
31. Palmisan, G., Addam, M., Augugliar, V., Caronna, T., Di Paola, A., Lopez, E. G., Lodd, V., Marci, G., Palmisan, L. and Schiavell, M. 2007. Selectivity of hydroxyl radical in the partial oxidation of aromatic compounds in heterogeneous photocatalysis. Catalysis Today, 122: 118-127.
32. Wang, S. P., Zhao, L. F., Wang, W., Zhao, Y. J., Zhang, G. L., Ma, X. B. and Gong, J. L. 2013. Morphology control of ceria nanocrystals for catalytic conversion of CO2 with methanol. Nanoscale, 5: 5582-5588.
33. Sun, C., Li, H. and Chen, L. 2012. Nanostructured ceria-based materials: synthesis, properties, and applications. Energy and Environmental Science, 5 (9): 8475-8505.
34. Magesh, G., Viswanathan, B., Viswanath, R. P. and Varadarajan, T. K. 2009. Photocatalytic behavior of CeO2-TiO2 system for the degradation of methylene blue. Indian Journal of Chemicals, B. 3: 480-488.
35. Umezawa, N., Shuxin, O. and Ye, J. 2011. Theoretical study of high photocatalytic performance of Ag3PO4. Physical review, B. 83: 035202.
36. Khan, A., Qamar, M. and Muneer, M. 2012. Synthesis of highly active visible-light-driven colloidal silver orthophosphate. Chemical Physics Letters, 519-520: 54-58.
37. Ge, M., Zhu, N., Zhao, Y., Li, J. and Liu, L. 2012. Sunlight-assisted degradation of dye pollutants in Ag3PO4 suspension. Industrial and Engineering Chemistry Research, 51 (14): 5167-5173.
38. Dong, P., Wang, Y., Li, H., Li, H., Ma, X. and Han, L. 2013. Shape-controllable synthesis and morphology-dependent photocatalytic properties of Ag3PO4 crystals. Journal of Materials Chemistry. A, Materials for Energy and Sustainability, 1 (15): 4651.
39. Yi, Z., Ye, J., Kikugawa, N., Kako, T., Ouyang, S. and Williams, S. H. 2010. An orthophosphate semiconductor with photooxidation properties under visible-light irradiation. Nature Materials, 9 (7): 559-564.
40. Erra, S., Shivakumar, C., Zhao, H., Barri, K., Morel, D. L. and Frekides, C. S. 2007. An effective method of Cd incorporation in CdS solar cells for improved stability. Thin Solid Films, 515: 5833.
41. Preethy, C., Kumari, P. and Sudheer, S. K. 2014. Photocatalytic activation of CdS NPs under visible light for environmental cleanup and disinfection. Solar Energy, 105: 542-547.
42. Lu, X., Zhai, T., Cui, H., Shi, J., Xie, S., Huang, Y., Liang, C. and Tong, Y. 2011. Redox cycles promoting photocatalytic hydrogen evolution of CeO2 nanorods. Journals of Material Chemistry, 21 (15): 5569-5572.
43. Ji, P., Zhang, J., Chen, F. and Anpo, M. 2009. Study of adsorption and degradation of Acid Orange 7 on the surface of CeO2 under visible light irradiation. Applied Catalysis B, 85 (3-4), 148-154.
44. Primo, A., Marino, T., Corma, A., Molinari, R. and Garcia, H. 2011. Efficient visible-light photocatalytic water splitting by minute amounts of gold supported on Nanoparticulate CeO2 obtained by a biopolymer Templating method. Journal of American Chemical Society, 133 (18): 6930-6933.
45. Feng, Y. J., Liu, L. L. and Wang, X. D. 2011. Hydrothermal synthesis and automotive exhaust catalytic performance of CeO2 nanotube arrays. Journal of Material Chemistry, 21 (39): 15442-15448.
46. Hu, S., Zhou, F., Wang, L. and Zhang, J. 2011. Preparation of Cu2O/CeO2 heterojunction photocatalyst for the degradation of Acid Orange 7 under visible light irradiation. Catalysis Communication, 12 (9): 794-797.
47. Yue, L. and Zhang, X. M. 2009. Structural characterization and photocatalytic behaviors of doped CeO2 nanoparticles. Journal of Alloys Compound, 475 (1-2): 702-705.
48. Zhang, J., Li, L., Huang, X. and Li, G. 2012. Fabrication of Ag-CeO2 core-shell nanospheres with enhanced catalytic performance due to strengthening of the interfacial interactions. Journal of Material Chemistry, 22 (21): 10480-10487.
49. Ijaz, S., Ehsan, M. F., Ashiq, M. N., Karamat, N. and He, T. 2016. Preparation of CdS/CeO2 core/shell composite for photocatalytic reduction of CO2 under visible-light irradiation. Applied Surface Science, 390: 550-559.
50. Song, Y., Zhao, H., Chen, Z., Wang, W., Huang, L., Xu, H. and Li, H. 2016. The CeO2/Ag3PO4 photocatalyst with stability and high photocatalytic activity under visible light irradiation. Physical Status Solidi A, 213 (9): 2356-2363.
51. Velusamy, P. and Lakshmi, G. 2017. Enhanced photocatalytic performance of (ZnO/CeO2)-b- CD system for the effective decolorization of Rhodamine B under UV light irradiation. Applied Water Science, 7: 4025-4036.
52. Saikia, P., Miah, A. T. and Das, P. P. 2017. Highly efficient catalytic reductive degradation of various organic dyes by Au/CeO2-TiO2 nano-hybrid. Journal of Chemical Sciences, 129 (1): 81-93.
53. Milenova, K., Zaharieva, K., Stambolova, I., Blaskov, V., Eliyas, A. and Dimitrov. L. 2017. Photocatalytic performance of TiO2, CeO2, ZnO and TiO2-CeO2-ZnO in the course of methyl orange dye degradation. Journal of Chemical Technology and Metallurgy, 52 (1): 13-19.
54. Abi M. Taddesse., Tigabu Bekele., Isabel Diaz. and Abebaw Adgo. 2021. Polyaniline supported CdS/CeO2/Ag3PO4 nanocomposite: An “A-B” type tandem n-n heterojunctions with enhanced photocatalytic activity. Journal of Photochemistry and Photobiology, A: Chemistry, 406: 113005.
55. Pouretedal, H. R., Tofangsazi, Z. and Keshavarz, M. H. 2012. Photocatalytic activity of mixture of ZrO2/SnO2, ZrO2/CeO2 and SnO2/CeO2 nanoparticles. Journal of Alloys Compound, 513: 359-364.
56. Yao, W., Zhang, B., Huang, C., Ma, C., Song, X. and Xu, Q. 2012. Synthesis and characterization of high efficiency and stable Ag3PO4/TiO2 visible light photocatalyst for the degradation of methylene blue and Rhodamine B solutions. Journal of Material Chemistry, 22 (9): 4050- 4055.
57. Bamwenda, G. R and Arakawa, H. J. 2000. Cerium dioxide as a photocatalyst for water decomposition to O2 in the presence of Ce4+ aq and Fe3+ aq species. Molecular Catalysis A: Chemistry, 161: 105-113.
58. Hernandez-Alonso, M. D., Hungrıa, A. B., Martınez-Arias, A., Fernandez-Garcıa, M., Coronado, J. M., Conesa, J. C. and Soria, J. 2004. EPR study of the photoassisted formation of radicals on CeO2 nanoparticles employed for toluene photooxidation. Applied Catalysis B: Environmental, 50 (3): 167-175.
59. Zhai, Y. Q., Zhang, S. Y. and Pang, H. 2007. Preparation, characterization and photocatalytic activity of cerium oxide nanocrystalline using ammonium bicarbonate as precipitant. Materials Letters, 61: 1863-1866.
60. Salker, A. V. and Borker, P. 2007. Solar assisted photocatalytic degradation of Naphthol Blue Black dye using Ce1-xMnxO2. Materials chemistry and physics, 103 (2-3): 366-370.
61. Huang, G. F., Ma, Z. L., Huang, W. Q., Tian, Y., Jiao, C., Yang, Z. M., Wan, Z. and Pan, A. 2013. Ag3PO4 Semiconductor Photocatalyst: Possibilities and Challenges. Journal of Nanomaterials, 2013 (8): 371356.
62. Yang, Z. M., Huang, G. F., Huang, W. Q., Wei, J. M., Yan, X. G. and Liu, Y. Y. 2014. Novel Ag3PO4/CeO2 composite with high efficiency and stability for photocatalytic applications. Journal of Materials Chemistry A, 2: 1750-1756.
63. Zhang, W., Hu, C., Zhai, W., Wang, Z., Sun, Y., Chi, F., Ran, S., Liu, X. and Lv, Y. 2016. Novel Ag3PO4/CeO2 p-n hierarchical heterojunction with enhanced photocatalytic performance. Materials Research, 19 (3): 673-679.
64. Barpuzary, D. and Qureshi, M. 2013. Enhanced photovoltaic performance of semiconductor- sensitized ZnO-CdS coupled with graphene oxide as a novel photoactive material. ACS Applied Material Interfaces, 5: 11673-11682.
65. Thakur, P. and Chadha, R. 2012. Synthesis and characterization of CdS doped TiO2 nanocrystalline powder: a spectroscopic study. Material Research Bulletin, 47: 1719- 1724.
66. Li, W., Xie, S., Li, M., Ouyang, X., Cui, G., Lu, X. and Tong, Y. 2013. CdS/CeOx heterostructured nanowires for photocatalytic hydrogen production. Journal of Material Chemistry A, 1: 4190-4193.
67. Gu, S., Chen, Y., Yuan, X., Wang, H., Chen, X., Liu, Y., Jiang, Q., Wu, Z. and Zeng, G. 2016. Facile synthesis of CeO2 nanoparticle sensitized CdS nanorod photocatalyst with improved visible light photocatalytic degradation of Rhodamine B. RSC Advances, 5: 79556-79564.
68. You, D. T., Pan, B., Jiang, F., Zhou, Y. G. and Su, W. Y. 2016. CdS nanoparticles/CeO2 nanorods composite with high-efficiency visible-light-driven photocatalytic activity. Applied Surface Science, 363: 154-160.
69. Zhang, X., Zhang, N., Xu, Y. and Tang, Z. R. 2015. One-dimensional CdS nanowires CeO2 nanoparticles composites with boosted photocatalytic activity. New Journal of Chemistry, 39: 6756-6764.
70. Xu, A. W., Gao, Y. and Liu, H. Q. 2002. The preparation, characterization, and their photocatalytic activities of rare-earth-doped TiO2 nanoparticles. Journals of Catalysis, 207: 151-157.
71. Wang, L., Ding, J., Chai, Y., Liu, Q., Ren, J., Liu, X. and Dai, W. L. 2015. CeO2 nanorod/g- C3N4/N-rGO composite: enhanced visible-light-driven photocatalytic performance and the role of N-rGO as electronic transfer media. Dalton Transactions, 44: 11223-11234.
72. Wang, J., Fan, H., Chen, W., Jiao, Y., Jin, W., Zhao, Y., Zhang, S. and Yao, H. 2011. Synergistic effect of CeO2 modified TiO2 photocatalyst on the enhancement of visible light photocatalytic performance. Journal of the Chinese Ceramic Society, 39: 2002-2007.
73. Chen, F., Ho, P., Ran, R., Chen, W., Si, Z., Wu, X., Weng, D., Huang, Z. and Lee, C. 2017. Synergistic effect of CeO2 modified TiO2 photocatalyst on the enhancement of visible light photocatalytic performance. Journal of Alloys and Compounds, doi: 10.1016/j.jallcom.2017.04.138.
74. Chen, C., Zhao, W., Lei, P., Zhao, J. and Serpone, N. 2004. Photosensitized degradation of dyes in Polyoxometalate solutions versus TiO2 dispersions under visible-light irradiation: mechanistic implications. Chemical European Journals, 10: 1956-1965.
75. Torreshuerta, A. M., Dominguezcrespo, M. A., Brachettisibaj, S. B., Dorantesrosales, H. J., Hernandezperez, M. A. and Loiscorre, J. A. 2010. Preparation of ZnO: CeO2-x thin films by AP-MOCVD: structural and optical properties. Journal of Solid State Chemistry, 183 (9): 2205-2217.
76. Ma, T. Y., Yuan, Z. Y. and Cao, J. L. 2010. Hydrangea-like meso/macroporous ZnO-CeO2 binary oxide materials: synthesis, photocatalysis and co-oxidation. European Journal of Inorganic Chemistry, 5: 716-724.
77. De Lima, J. F., Martins, R. F., Neri, C R. and Serra, O. A. 2009. ZnO: CeO2-based nanopowders with low catalytic activity as UV absorbers. Applied Surface Science, 255 (22): 9006- 9009.
78. Mo, L. Y., Zheng, X. M. and Yeh, C. T. 2005. A novel CeO2/ZnO catalyst for hydrogen production from the partial oxidation of methanol. Chemical Physics Chemistry, 6 (8): 1470-1472.
79. Nidhi, H., Shah, Karan, R., Bhangaonkar, S. and Mhaske, T. 2017. In-Situ Synthesis of CeO2/ZnO composite nanoparticles and its application in degradation of Rhodamine B using Sonocatalytic and photocatalytic method. International Journal of Materials Science and Engineering, 5 (1): 16-27.
80. Rodwihok, C., Wongratanaphisan, D., Tam, T. V., Choi, W. M., Hur, S. H. and Chung, J. S. 2020. Cerium-oxide-nanoparticle-decorated zinc oxide with enhanced photocatalytic degradation of methyl orange. Applied Science, 10: 1697.
81. Yuan, Y., Huang, G. F., Hu, W. Y., Xiong, DN., Zhou, B. X., Chang, S. and Huang, W. Q. 2017. Construction of g-C3N4/CeO2/ZnO ternary photocatalysts with enhanced photocatalytic performance. Journal of Physics and Chemistry of Solids, 106: 1-9.
82. Prabhu, S., Viswanathan, T., Jothivenkatachalam, K. and Jeganathan, K. 2014. Visible light photocatalytic activity of CeO2-ZnO-TiO2 composites for the degradation of Rhodamine B. Indian Journal of Materials Science,
83. Pan, H., Haoxi, J. and Minhua, Z. 2012. Structures and oxygen storage capacities of CeO2-ZrO2- Al2O3 ternary oxides prepared by a green route: supercritical anti-solvent precipitation. Journal of Rare Earths, 30 (6): 524.
84. Reddy, B. M., Lakshmanan, P. and Khan, A. 2004. Investigation of surface structures of dispersed V2O5 on CeO2-SiO2, CeO2-TiO2 and CeO2-ZrO2 mixed oxides by XRD, Raman, and XPS techniques. Journal of Physical Chemistry B, 108 (43): 16855-16863.
85. Reddy, B. M., Khan, A., Lakshmanan, P., Aouine, M., Loridant, S. and Volta, J. C. 2005. Structural characterization of nanosized CeO2-SiO2, CeO2-TiO2, and CeO2-ZrO2 catalysts by XRD, Raman, and HREM techniques. Journal of Physical Chemistry B, 109 (8): 3355-3363.
86. Berg, J. M., Romozer, A., Banerjee, N. and Sayes, C. M. 2009. The relationship between pH and zeta potential of 30 nm metal oxide nanoparticle suspensions relevant to in vitro toxicological evaluations. Nanotoxicology, 3: 276-283.
87. Haileyesus, Tedla., Isabel, Diaz., Tesfahun, Kebede., Abi M, Taddesse. 2015. Synthesis, characterization and photocatalytic activity of zeolite supported ZnO/Fe2O3/MnO2 nanocomposite. Journal of Environmental Chemical Engineering, 3: 1586-1591.
88. Jin, C., Liu, G., Zu, L., Qin, Y. and Yang, J. 2015. Preparation of Ag/Ag3PO4/ZnO ternary heterostructured for photocatalytic studies. Journal of Colloid and Interface Science, 453: 36-41.
89. Lee, K., Cho, S., Park, S. H., Heeger, A. J., Lee, C. W. and Lee, S. H. 2006. Metallic transport in polyaniline. Nature, 441 (7089): 65-68.
90. Bu, Y. and Chen, Z. 2014. Role of polyaniline on the photocatalytic degradation and stability performance of the Polyaniline/Silver/Silver Phosphate composite under visible light. American Chemical Society of Applied Material Interfaces, 6 (20): 17589-17598.
91. Zhang, H., Zong, R., Zhao, J. and Zhu, Y. 2008. Dramatic visible photocatalytic degradation performances due to synergetic effect of TiO2 with PANI. Environmental Science Technology, 42 (10): 3803-3807.
92. Ge, L., Han, C. and Liu, J. 2012. In situ synthesis and enhanced visible light photocatalytic activities of novel PANI/g-C3N4 composite photocatalysts. Journal of Material Chemistry, 22 (23): 11843-11850.
93. Zhang, L. J. and Wan, M X. 2003. Polyaniline/TiO2 nanocomposite nanotubes. Journal of Physical Chemistry, 107 (28): 6748-6753.
94. Fujishima, A., Rao, T. N. and Tryk, D. K. 2000. Titanium dioxide photocatalysis. Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 1 (1): 1-21.
95. Hidalgo, D., Bocchini, S., Fontana, M., Saraccob, G. and Hernandez, S. 2015. Green and low- cost synthesis of PANI-TiO2 nanocomposite mesoporous films for photoelectrochemical water splitting. Royal Society of Chemistry, 5: 49429-49438.
96. Ameen, A., Akhtar, M. S., Kim, Y. S., Yang, B. and Shin, H. S. 2011. An effective nanocomposite of polyaniline and ZnO: preparation, characterizations, and its photocatalytic activity. Colloid Polymer Sciences, 289: 415-421.
97. Li, J., Zhu, L., Wu, Y., Harima, Y., Zhang, A. and Tang, H. 2006. Green and low-cost synthesis of PANI/TiO2 nanocomposite mesoporous films for photoelectrochemical water splitting. Polymer, 47: 7361-7367.