Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study
In this study, we have employed a photocatalytic method to restore the liquid effluent from a palm oil mill in Malaysia. Specifically, the performance of both TiO2 and ZnO was compared for the photocatalytic polishing of palm oil mill effluent (POME). The ZnO photocatalyst has irregular shape, bigge...
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my.ump.umpir.129262017-09-11T07:34:18Z http://umpir.ump.edu.my/id/eprint/12926/ Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study Kim, Hoong Ng Khan, Maksudur R. Ng, Yun Hau Hossain, Sk Safdar Cheng, C. K. TP Chemical technology In this study, we have employed a photocatalytic method to restore the liquid effluent from a palm oil mill in Malaysia. Specifically, the performance of both TiO2 and ZnO was compared for the photocatalytic polishing of palm oil mill effluent (POME). The ZnO photocatalyst has irregular shape, bigger in particle size but smaller BET specific surface area (9.71 m2/g) compared to the spherical TiO2 photocatalysts (11.34 m2/g). Both scavenging study and post-reaction FTIR analysis suggest that the degradation of organic pollutant in the TiO2 system has occurred in the bulk solution. In contrast, it is necessary for organic pollutant to adsorb onto the surface of ZnO photocatalyst, before the degradation took place. In addition, the reactivity of both photocatalysts differed in terms of mechanisms, photocatalyst loading and also the density of photocatalysts. From the stability test, TiO2 was found to offer higher stability, as no significant deterioration in activity was observed after three consecutive cycles. On the other hand, ZnO lost around 30% of its activity after the 1st-cycle of photoreaction. The pH studies showed that acidic environment did not improve the photocatalytic degradation of the POME, whilst in the basic environment, the reaction media became cloudy. In addition, longevity study also showed that the TiO2 was a better photocatalyst compared to the ZnO (74.12%), with more than 80.0% organic removal after 22 h of UV irradiation. Elsevier Ltd 2017 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/12926/2/Restoration%20of%20liquid%20effluent%20from%20oil%20palm%20agroindustry%20in%20Malaysia%20using%20UV-TiO2%20and%20UV-ZnO%20photocatalytic%20systems-%20A%20comparative%20study%201.pdf Kim, Hoong Ng and Khan, Maksudur R. and Ng, Yun Hau and Hossain, Sk Safdar and Cheng, C. K. (2017) Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study. Journal of Environmental Management, 196. pp. 674-680. ISSN 0301-4797 http://doi.org/10.1016/j.jenvman.2017.03.078 doi: 10.1016/j.jenvman.2017.03.078 |
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TP Chemical technology Kim, Hoong Ng Khan, Maksudur R. Ng, Yun Hau Hossain, Sk Safdar Cheng, C. K. Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study |
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In this study, we have employed a photocatalytic method to restore the liquid effluent from a palm oil mill in Malaysia. Specifically, the performance of both TiO2 and ZnO was compared for the photocatalytic polishing of palm oil mill effluent (POME). The ZnO photocatalyst has irregular shape, bigger in particle size but smaller BET specific surface area (9.71 m2/g) compared to the spherical TiO2 photocatalysts (11.34 m2/g). Both scavenging study and post-reaction FTIR analysis suggest that the degradation of organic pollutant in the TiO2 system has occurred in the bulk solution. In contrast, it is necessary for organic pollutant to adsorb onto the surface of ZnO photocatalyst, before the degradation took place. In addition, the reactivity of both photocatalysts differed in terms of mechanisms, photocatalyst loading and also the density of photocatalysts. From the stability test, TiO2 was found to offer higher stability, as no significant deterioration in activity was observed after three consecutive cycles. On the other hand, ZnO lost around 30% of its activity after the 1st-cycle of photoreaction. The pH studies showed that acidic environment did not improve the photocatalytic degradation of the POME, whilst in the basic environment, the reaction media became cloudy. In addition, longevity study also showed that the TiO2 was a better photocatalyst compared to the ZnO (74.12%), with more than 80.0% organic removal after 22 h of UV irradiation. |
format |
Article |
author |
Kim, Hoong Ng Khan, Maksudur R. Ng, Yun Hau Hossain, Sk Safdar Cheng, C. K. |
author_facet |
Kim, Hoong Ng Khan, Maksudur R. Ng, Yun Hau Hossain, Sk Safdar Cheng, C. K. |
author_sort |
Kim, Hoong Ng |
title |
Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study |
title_short |
Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study |
title_full |
Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study |
title_fullStr |
Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study |
title_full_unstemmed |
Restoration of Liquid Effluent from Oil Palm Agroindustry in Malaysia using UV/TiO2 and UV/ZnO Photocatalytic Systems: A Comparative Study |
title_sort |
restoration of liquid effluent from oil palm agroindustry in malaysia using uv/tio2 and uv/zno photocatalytic systems: a comparative study |
publisher |
Elsevier Ltd |
publishDate |
2017 |
url |
http://umpir.ump.edu.my/id/eprint/12926/2/Restoration%20of%20liquid%20effluent%20from%20oil%20palm%20agroindustry%20in%20Malaysia%20using%20UV-TiO2%20and%20UV-ZnO%20photocatalytic%20systems-%20A%20comparative%20study%201.pdf http://umpir.ump.edu.my/id/eprint/12926/ http://doi.org/10.1016/j.jenvman.2017.03.078 |
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1643667025717886976 |
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13.18916 |