Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper
The use of nanosized titanium dioxide (TiO2) and zinc oxide (ZnO) in the suspension form during treatment makes the recovering and recycling of photocatalysts difficult. Hence, supported photocatalysts are preferred for practical water treatment applications. This study was conducted to investigate...
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| Format: | Article |
| Language: | English |
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Chinese Academy of Sciences
2017
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| Online Access: | http://ir.unimas.my/id/eprint/16691/ http://ir.unimas.my/id/eprint/16691/1/Combined%20effects%20of%20adsorption%20%28abstract%29.pdf |
| _version_ | 1848838116357439488 |
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| author | Kanakaraju, Devagi Shantini, Ravichandar Ying, Chin Lim |
| author_facet | Kanakaraju, Devagi Shantini, Ravichandar Ying, Chin Lim |
| author_sort | Kanakaraju, Devagi |
| building | UNIMAS Institutional Repository |
| collection | Online Access |
| description | The use of nanosized titanium dioxide (TiO2) and zinc oxide (ZnO) in the suspension form during treatment makes the recovering and recycling of photocatalysts difficult. Hence, supported photocatalysts are preferred for practical water treatment applications. This study was conducted to investigate the efficiency of calcium alginate (CaAlg) beads that were immobilized with hybrid photocatalysts, TiO2/ZnO to form TiO2/ZnO–CaAlg. These immobilized beads, with three different mass ratios of TiO2:ZnO (1:1, 1:2, and 2:1) were used to remove Cu(II) in aqueous solutions in the presence of ultraviolet light. These beads were subjected to three cycles of photocatalytic treatment with different initial Cu(II) concentrations (10–80 ppm). EDX spectra have confirmed the inclusion of Ti and Zn on the surface of the CaAlg beads. Meanwhile, the surface morphology of the beads as determined using SEM, has indicated differences of before and after the photocatalytic treatment of Cu(II). Among all three, the equivalent mass ratio TiO2/ZnO–CaAlg beads have shown the best performance in removing Cu(II) during all three recycling experiments. Those TiO2/ZnO–CaAlg beads have also shown consistent removal of Cu, ranging from 7.14–62.0 ppm (first cycle) for initial concentrations of 10–80 ppm. In comparison, bare CaAlg was only able to remove 6.9–48 ppm of similar initial Cu concentrations. Thus, the potential use of TiO2/ZnO–CaAlg beads as environmentally friendly composite material can be further extended for heavy metal removal from contaminated water. |
| first_indexed | 2025-11-15T06:50:26Z |
| format | Article |
| id | unimas-16691 |
| institution | Universiti Malaysia Sarawak |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T06:50:26Z |
| publishDate | 2017 |
| publisher | Chinese Academy of Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | unimas-166912017-06-20T00:36:55Z http://ir.unimas.my/id/eprint/16691/ Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper Kanakaraju, Devagi Shantini, Ravichandar Ying, Chin Lim QD Chemistry The use of nanosized titanium dioxide (TiO2) and zinc oxide (ZnO) in the suspension form during treatment makes the recovering and recycling of photocatalysts difficult. Hence, supported photocatalysts are preferred for practical water treatment applications. This study was conducted to investigate the efficiency of calcium alginate (CaAlg) beads that were immobilized with hybrid photocatalysts, TiO2/ZnO to form TiO2/ZnO–CaAlg. These immobilized beads, with three different mass ratios of TiO2:ZnO (1:1, 1:2, and 2:1) were used to remove Cu(II) in aqueous solutions in the presence of ultraviolet light. These beads were subjected to three cycles of photocatalytic treatment with different initial Cu(II) concentrations (10–80 ppm). EDX spectra have confirmed the inclusion of Ti and Zn on the surface of the CaAlg beads. Meanwhile, the surface morphology of the beads as determined using SEM, has indicated differences of before and after the photocatalytic treatment of Cu(II). Among all three, the equivalent mass ratio TiO2/ZnO–CaAlg beads have shown the best performance in removing Cu(II) during all three recycling experiments. Those TiO2/ZnO–CaAlg beads have also shown consistent removal of Cu, ranging from 7.14–62.0 ppm (first cycle) for initial concentrations of 10–80 ppm. In comparison, bare CaAlg was only able to remove 6.9–48 ppm of similar initial Cu concentrations. Thus, the potential use of TiO2/ZnO–CaAlg beads as environmentally friendly composite material can be further extended for heavy metal removal from contaminated water. Chinese Academy of Sciences 2017-05-01 Article PeerReviewed text en http://ir.unimas.my/id/eprint/16691/1/Combined%20effects%20of%20adsorption%20%28abstract%29.pdf Kanakaraju, Devagi and Shantini, Ravichandar and Ying, Chin Lim (2017) Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper. Journal of Environmental Sciences (China), 55. pp. 214-223. ISSN 10010742 https://www.researchgate.net/publication/308978340 DOI: 10.1016/j.jes.2016.05.043 |
| spellingShingle | QD Chemistry Kanakaraju, Devagi Shantini, Ravichandar Ying, Chin Lim Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper |
| title | Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper |
| title_full | Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper |
| title_fullStr | Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper |
| title_full_unstemmed | Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper |
| title_short | Combined effects of adsorption and photocatalysis by hybrid TiO<inf>2</inf>/ZnO-calcium alginate beads for the removal of copper |
| title_sort | combined effects of adsorption and photocatalysis by hybrid tio<inf>2</inf>/zno-calcium alginate beads for the removal of copper |
| topic | QD Chemistry |
| url | http://ir.unimas.my/id/eprint/16691/ http://ir.unimas.my/id/eprint/16691/ http://ir.unimas.my/id/eprint/16691/ http://ir.unimas.my/id/eprint/16691/1/Combined%20effects%20of%20adsorption%20%28abstract%29.pdf |