SIGNIFICANT EFFECT OF PH ON PHOTOCATALYTIC DEGRADATION OF ORGANIC POLLUTANTS USING SEMICONDUCTOR CATALYSTS
DOI:
https://doi.org/10.11113/jt.v78.9559Keywords:
pH, Ag/TiO2, α-Fe2O3/HY, 2-chlorophenol, methyl orange.Abstract
Photocatalytic is one of the inexpensive and non-toxic techniques for degradation of organic pollutants into harmless substances such as water and carbon dioxide. In this study, simple electrolysis method was used in preparation of Ag/TiO2 and α-Fe2O3/HY catalysts. The physicochemical properties of the catalysts were studied using XRD, FTIR, FESEM-EDX and surface area analysis. The pH of solution plays an important role in the photocatalytic degradation of organic pollutants which influences the surface-charge properties of the catalysts. Ag/TiO2 and α-Fe2O3/HY were used as catalyst on degradation of 2-chlorophenol (2-CP) and methyl orange (MO), respectively. The effect of pH on degradation of 2-CP and MO were investigated over a pH range from 2 to 9. Higher degradation of 2-CP and MO were obtained at pH 5 (74%) and pH 2 (80%), respectively. This finding might be explained by the amphoteric performance of the catalyst using point zero charge (pHZPC). The pHZPC for Ag/TiO2 and α-Fe2O3/HY was found to be at pH 6.3 and pH 7.2, respectively. Hence, the activities of the catalysts may have been affected by the existence of a strong electrostatic field between the positively charged catalysts surface and negatively charged 2-CP and MO caused a pH value lower than their pHZPC give greater degradation.
References
Aishah, A. J., Hartini, M. A., Normala, S., Norhuda, A. M., Hanis, H. H. N., Razif, H. M., and Sugeng, T. 2007. Carbon Dioxide Fixation Method for Electrosynthesis of Benzoic Acid from Chlorobenzene. Journal of Natural Gas Che-mistry. 16(3): 273-277.
Karim, A. H., Jalil, A. A., Triwahyono, S., Sidik, S. M., Kamarudin, N. H. N., Jusoh, R., Jusoh, N.C.W., and Hameed, B. H. 2012. Amino Modified Mesostructured Silica Nanoparticles for Efficient Adsorption of Methylene Blue. Journal of Colloid and Interface Science. 386(1): 307-314.
Bruce, R. M., Santodonato, J., and Neal, M. W. 1987. Summary Review of The Health Effects Associated With Phenol. Toxicology and Indus-trial Health. 3(4): 535-568.
El Qada, E. N., Allen, S. J., and Walker, G. M. 2006. Adsorption of Methylene Blue Onto Activated Carbon Produced From Steam Activated Bituminous Coal: A Study of Equilibrium Adsorption Isotherm. Chemical Engineering Journal. 124(1): 103-110.
Jalil, A. A., Panjang, N. F. A., Akhbar, S., Sundang, M., Tajuddin, N., and Triwahyono, S. 2007. Complete Electrochemical Dechlorination of Chlorobenzenes In The Presence of Naphthalene Mediator. Journal of Hazardous Materials. 148(1): 1-5.
Zhao, J., Chen, C., and Ma, W. 2005. Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation. Topics in Cataly-sis. 35(3-4): 269-278.
Jusoh, R., Jalil, A. A., Triwahyono, S., Idris, A., Haron, S., Sapawe, N., Jaafar, N. F., and Jusoh, N. W. C. 2014. Synthesis of Reverse Micelle α-FeOOH Nanoparticles In Ionic Liquid As An Only Electrolyte: Inhibition of Electron–Hole Pair Recombination For Efficient Photoactivity. Applied Catalysis A: General. 469: 33-44.
Jalil, A. A., Satar, M. A. H., Triwahyono, S., Setiabudi, H. D., Kamarudin, N. H. N., Jaafar, N. F., Sapawe, N.F., and Ahamad, R. 2013. Tailoring The Current Density to Enhance Photocatalytic Activity of CuO/HY For Decolorization of Malachite Green. Journal of Electroanalytical Chemistry. 701: 50-58.
Jaafar, N. F., Jalil, A. A., Triwahyono, S., Muhid, M. N. M., Sapawe, N., Satar, M. A. H., and Asaari, H. 2012. Photodecolorization of Methyl Orange Over α-Fe2O3-Supported HY Catalysts: The Effects of Catalyst Preparation and Dealumination. Chemical Engineering Journal. 191: 112-122.
Jalil, A. A., Triwahyono, S., Razali, N. A. M., Hairom, N.H.H., Idris, A., Muhid, M.N.M., Ismail, A., Yahaya, N.A.M., Ahmad, N.A.L., and Dzinun, H. 2010. Complete Electrochemical Dechlorination of Chlorobenzenes In The Presence of Various Arene Mediators. Journal of Hazardous Materials. 174(1): 581-585.
Jalil, A. A., Kurono, N., and Tokuda, M. 2002. Facile Synthesis of Ethyl 2-Arylpropenoates by Cross-Coupling Reaction Using Electrogenerated Highly Reactive Zinc. Tetrahedron. 58(37): 7477-7484.
Jalil, A. A., Kurono, N., and Tokuda, M. 2002. Synthesis of The Precursor of Anti-Inflammatory Agents By Cross-Coupling Using Electrogenerated Highly Reactive Zinc. Synthesis. 18: 2681-2686.
Jalil, A. A., Kurono, N., and Tokuda, M. 2001. Facile Synthesis of 2-arylpropenoic Acid Esters By Cross-Coupling Using Electrogenerated Highly Reactive Zinc and a Palladium Catalyst. Synlett. 2001(12): 1944-1946.
Jaafar, N. F., Jalil, A. A., Triwahyono, S., Efendi, J., Mukti, R.R., Jusoh, R., Jusoh, N.W.C., Karim, A.H., Salleh, N.F.M., and Suendo, V. 2015. Direct In Situ Activation of Ag0 Nanoparticles In Synthesis of Ag/TiO2 And Its Photoactivity. Applied Surface Science. 338: 75-84.
Jusoh, N.W.C., Jalil, A. A., Triwahyono, S., Setiabudi, H.D., Sapawe, N., Satar, M.A.H., Karim, A.H., Kamarudin, N. H. N., Jusoh, R., Jaafar, N.F., and Salamun, N. 2013. Sequential Desilication–Isomorphous Substitution Route to Prepare Mesostructured Silica Nanoparticles Loaded With ZnO And Their Photocatalytic Activity. Applied Catalysis A: General. 468: 276-287.
An, N., Yu, Q., Liu, G., Li, S., Jia, M., and Zhang, W. 2011. Complete Oxidation of Formaldehyde at Ambient Temperature over Supported Pt/Fe2O3 Catalysts Prepared By Colloid-deposition Method. Journal of Hazardous Mate-rials. 186(2): 1392-1397.
Setiabudi, H. D., Jalil, A. A., and Triwahyono, S. 2012. Ir/Pt-HZSM5 for n-pentane Isomerization: Effect of Iridium Loading on The Properties and Catalytic Activity. Journal of Catalysis. 294: 128-135.
Kontapakdee, K., Panpranot, J., and Praserth-dam, P. 2007. Effect of Ag Addition on The Properties of Pd-Ag/TiO2 Catalysts Containing Different TiO2 Crystalline Phases. Catalysis Communications. 8(12): 2166-2170.
Ismail, A. A. 2012. Facile Synthesis of Mesoporous Ag-loaded TiO2 Thin Film and Its Photocatalytic Properties. Microporous and Mesoporous Ma-terials. 149(1): 69-75.
Jusoh, R., Jalil, A. A., Triwahyono, S., and Kamarudin, N.H.N. 2015. Synthesis of Dual Type Fe Species Supported Mesostructured Silica Nanoparticles: Synergistical Effects In Photocatalytic Activity. RSC Advances. 5(13): 9727-9736.
Lopez, T., Sanchez, E., Bosch, P., Meas, Y., and Gomez, R. 1992. FTIR and UV-Vis (Diffuse Reflectance) Spectroscopic Characterization of TiO2 Sol-Gel. Materials Chemistry and Physics. 32(2): 141-152.
Wang, C., Shi, H., and Li, Y. 2011. Synthesis and Characteristics of Natural Zeolite Supported Fe3+-TiO2 Photocatalysts. Applied Surface Science. 257(15): 6873-6877.
Adam, S. H., Jalil, A. A., and Triwahyono, S. 2012. Novel Removal of Water-insoluble Disperse Dye Onto A Low-Cost Adsorbent Prepared from Tropical Fruit Waste. Desalination and Water Treatment. 49(1-3): 337-347.
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