Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes
During the process and operation of the dyes, the wastes produced were commonly found to contain organic and inorganic impurities leading to risks in the ecosystem and biodiversity with the resultant impact on the environment. Improper effluent disposal in aqueous ecosystems leads to reduction of su...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/692307 |
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| author | Nurhidayatullaili Muhd Julkapli Samira Bagheri Sharifah Bee Abd Hamid |
| author_facet | Nurhidayatullaili Muhd Julkapli Samira Bagheri Sharifah Bee Abd Hamid |
| author_sort | Nurhidayatullaili Muhd Julkapli |
| collection | DOAJ |
| description | During the process and operation of the dyes, the wastes produced were commonly found to contain organic and inorganic impurities leading to risks in the ecosystem and biodiversity with the resultant impact on the environment. Improper effluent disposal in aqueous ecosystems leads to reduction of sunlight penetration which in turn diminishes photosynthetic activity, resulting in acute toxic effects on the aquatic flora/fauna and dissolved oxygen concentration. Recently, photodegradation of various synthetic dyes has been studied in terms of their absorbance and the reduction of oxygen content by changes in the concentration of the dye. The advantages that make photocatalytic techniques superior to traditional methods are the ability to remove contaminates in the range of ppb, no generation of polycyclic compounds, higher speed, and lower cost. Semiconductor metal oxides, typically TiO2, ZnO, SnO, NiO, Cu2O, Fe3O4, and also CdS have been utilized as photocatalyst for their nontoxic nature, high photosensitivity, wide band gap and high stability. Various process parameters like photocatalyst dose, pH and initial dye concentrations have been varied and highlighted. Research focused on surface modification of semiconductors and mixed oxide semiconductors by doping them with noble metals (Pt, Pd, Au, and Ag) and organic matter (C, N, Cl, and F) showed enhanced dye degradation compared to corresponding native semiconductors. This paper reviews recent advances in heterogeneous photocatalytic decolorization for the removal of synthetic dyes from water and wastewater. Thus, the main core highlighted in this paper is the critical selection of semiconductors for photocatalysis based on the chemical, physical, and selective nature of the poisoning dyes. |
| format | Article |
| id | doaj-art-c8af01b4db064351984d1e30f4ebb2ab |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-c8af01b4db064351984d1e30f4ebb2ab2025-02-03T06:14:02ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/692307692307Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic DyesNurhidayatullaili Muhd Julkapli0Samira Bagheri1Sharifah Bee Abd Hamid2Nanotechnology & Catalysis Research Centre (NANOCAT), IPS Building, University Malaya, 50603 Kuala Lumpur, MalaysiaNanotechnology & Catalysis Research Centre (NANOCAT), IPS Building, University Malaya, 50603 Kuala Lumpur, MalaysiaNanotechnology & Catalysis Research Centre (NANOCAT), IPS Building, University Malaya, 50603 Kuala Lumpur, MalaysiaDuring the process and operation of the dyes, the wastes produced were commonly found to contain organic and inorganic impurities leading to risks in the ecosystem and biodiversity with the resultant impact on the environment. Improper effluent disposal in aqueous ecosystems leads to reduction of sunlight penetration which in turn diminishes photosynthetic activity, resulting in acute toxic effects on the aquatic flora/fauna and dissolved oxygen concentration. Recently, photodegradation of various synthetic dyes has been studied in terms of their absorbance and the reduction of oxygen content by changes in the concentration of the dye. The advantages that make photocatalytic techniques superior to traditional methods are the ability to remove contaminates in the range of ppb, no generation of polycyclic compounds, higher speed, and lower cost. Semiconductor metal oxides, typically TiO2, ZnO, SnO, NiO, Cu2O, Fe3O4, and also CdS have been utilized as photocatalyst for their nontoxic nature, high photosensitivity, wide band gap and high stability. Various process parameters like photocatalyst dose, pH and initial dye concentrations have been varied and highlighted. Research focused on surface modification of semiconductors and mixed oxide semiconductors by doping them with noble metals (Pt, Pd, Au, and Ag) and organic matter (C, N, Cl, and F) showed enhanced dye degradation compared to corresponding native semiconductors. This paper reviews recent advances in heterogeneous photocatalytic decolorization for the removal of synthetic dyes from water and wastewater. Thus, the main core highlighted in this paper is the critical selection of semiconductors for photocatalysis based on the chemical, physical, and selective nature of the poisoning dyes.http://dx.doi.org/10.1155/2014/692307 |
| spellingShingle | Nurhidayatullaili Muhd Julkapli Samira Bagheri Sharifah Bee Abd Hamid Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes The Scientific World Journal |
| title | Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes |
| title_full | Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes |
| title_fullStr | Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes |
| title_full_unstemmed | Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes |
| title_short | Recent Advances in Heterogeneous Photocatalytic Decolorization of Synthetic Dyes |
| title_sort | recent advances in heterogeneous photocatalytic decolorization of synthetic dyes |
| url | http://dx.doi.org/10.1155/2014/692307 |
| work_keys_str_mv | AT nurhidayatullailimuhdjulkapli recentadvancesinheterogeneousphotocatalyticdecolorizationofsyntheticdyes AT samirabagheri recentadvancesinheterogeneousphotocatalyticdecolorizationofsyntheticdyes AT sharifahbeeabdhamid recentadvancesinheterogeneousphotocatalyticdecolorizationofsyntheticdyes |