Catalytic potential of cobalt oxide and agar nanocomposite hydrogel for the chemical reduction of organic pollutants
| Autor: | Tahseen Kamal, Nauman Ali, Ashi Khalil, Abdullah M. Asiri, Adnan Khan |
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| Rok vydání: | 2020 |
| Předmět: |
02 engineering and technology
Heterogeneous catalysis Biochemistry Catalysis law.invention Nanocomposites Nitrophenols 03 medical and health sciences chemistry.chemical_compound Structural Biology law Chemical Precipitation Calcination Molecular Biology Cobalt oxide 030304 developmental biology 0303 health sciences Nanocomposite Aqueous solution Chemistry Selective catalytic reduction Congo Red Hydrogels Oxides General Medicine Cobalt 021001 nanoscience & nanotechnology Congo red Methylene Blue Agar Environmental Pollutants 0210 nano-technology Nuclear chemistry |
| Zdroj: | International journal of biological macromolecules. 164 |
| ISSN: | 1879-0003 |
| Popis: | In this study, cobalt oxide nanoparticles (Co3O4 NPs) were synthesized by precipitation method from cobalt sulphate solution with basic pH, followed by calcination. The ex-situ synthesized Co3O4 NPs were mixed with hot agar (AG) aqueous solution. The preparation of AG- Co3O4 nanocomposite hydrogel was carried out by self-association method promoted by thermal denaturation. The quenching of hot suspension from 80 °C to room temperature resulted in the formation of AG-Co3O4 nanocomposite hydrogel. The as-synthesized AG-Co3O4 was characterized by FTIR, XRD and SEM techniques. In order to test the catalytic activity, AG-Co3O4 was used as a heterogeneous catalyst for the reduction of methylene blue (MB), congo red (CR) and 4-nitrophenol (4-NP). The excellent performance of the AG-Co3O4 was shown by the reaction rate constant (kapp) values of 0.3623, 0.2114 and 0.2893 for MB, 4-NP and CR, respectively. All these results were obtained with R2 above 94 and utilization of an AG-Co3O4 catalyst. Furthermore, the catalytic reduction was studied with varying dye concentration and catalyst dose. This study showed that AG-Co3O4 catalyst has high potential for remediation of environmental pollutants in wastewaters. |
| Databáze: | OpenAIRE |
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