Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process
Emerging dye pollution from textile industrial effluents is becoming more challenging for researchers worldwide. The contamination of water by dye effluents affects the living organisms in an ecosystem. Methylene blue (MB) and malachite green (MG) are soluble dyes with a high colour intensity even a...
| Main Authors: | , , , , , , , |
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| Format: | Article |
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MDPI
2022
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| _version_ | 1811137640515239936 |
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| author | Ahmad, Afiqah Md. Jamil, Siti Nurul Ain Choong, Thomas S. Y. Abdullah, Abdul Halim Faujan, Nur Hana Adeyi, Abel A. Daik, Rusli Othman, Nurhanisah |
| author_facet | Ahmad, Afiqah Md. Jamil, Siti Nurul Ain Choong, Thomas S. Y. Abdullah, Abdul Halim Faujan, Nur Hana Adeyi, Abel A. Daik, Rusli Othman, Nurhanisah |
| author_sort | Ahmad, Afiqah |
| collection | UPM |
| description | Emerging dye pollution from textile industrial effluents is becoming more challenging for researchers worldwide. The contamination of water by dye effluents affects the living organisms in an ecosystem. Methylene blue (MB) and malachite green (MG) are soluble dyes with a high colour intensity even at low concentration and are hazardous to living organisms. The adsorption method is used in most wastewater plants for the removal of organic pollutants as it is cost-effective, has a high adsorption capacity, and good mechanical stabilities. In this study, a composite adsorbent was prepared by impregnating iron modified silica (FMS) onto polyurethane (PU) foam to produce an iron modified silica/polyurethane (FMS/PU) composite. The composite adsorbent was utilised in batch adsorption of the cationic dyes MB and MG. The effect of adsorption parameters such as the adsorbent load, pH, initial dye concentration, and contact time were discussed. Adsorption kinetics and isotherm were implemented to understand the adsorption mechanism for both dyes. It was found that the adsorption of MB and MG followed the pseudo-second order model. The Langmuir model showed a better fit than the Freundlich model for the adsorption of MB and MG, indicating that the adsorption occurred via the monolayer adsorption system. The maximum adsorption capacity of the FMS/PU obtained for MB was 31.7 mg/g, while for MG, it was 34.3 mg/g. The thermodynamic study revealed that the adsorption of MB and MG were exothermic and spontaneous at room temperature. In addition, the regeneration of FMS/PU was conducted to investigate the composite efficiency in adsorbing dyes for several cycles. The results showed that the FMS/PU composite could be regenerated up to four times when the regeneration efficiency dropped drastically to less than 20.0%. The impregnation of FMS onto PU foam also minimised the adsorbent loss into the environment. |
| first_indexed | 2024-09-25T03:37:31Z |
| format | Article |
| id | upm.eprints-103047 |
| institution | Universiti Putra Malaysia |
| last_indexed | 2024-09-25T03:37:31Z |
| publishDate | 2022 |
| publisher | MDPI |
| record_format | dspace |
| spelling | upm.eprints-1030472024-06-23T01:14:27Z http://psasir.upm.edu.my/id/eprint/103047/ Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process Ahmad, Afiqah Md. Jamil, Siti Nurul Ain Choong, Thomas S. Y. Abdullah, Abdul Halim Faujan, Nur Hana Adeyi, Abel A. Daik, Rusli Othman, Nurhanisah Emerging dye pollution from textile industrial effluents is becoming more challenging for researchers worldwide. The contamination of water by dye effluents affects the living organisms in an ecosystem. Methylene blue (MB) and malachite green (MG) are soluble dyes with a high colour intensity even at low concentration and are hazardous to living organisms. The adsorption method is used in most wastewater plants for the removal of organic pollutants as it is cost-effective, has a high adsorption capacity, and good mechanical stabilities. In this study, a composite adsorbent was prepared by impregnating iron modified silica (FMS) onto polyurethane (PU) foam to produce an iron modified silica/polyurethane (FMS/PU) composite. The composite adsorbent was utilised in batch adsorption of the cationic dyes MB and MG. The effect of adsorption parameters such as the adsorbent load, pH, initial dye concentration, and contact time were discussed. Adsorption kinetics and isotherm were implemented to understand the adsorption mechanism for both dyes. It was found that the adsorption of MB and MG followed the pseudo-second order model. The Langmuir model showed a better fit than the Freundlich model for the adsorption of MB and MG, indicating that the adsorption occurred via the monolayer adsorption system. The maximum adsorption capacity of the FMS/PU obtained for MB was 31.7 mg/g, while for MG, it was 34.3 mg/g. The thermodynamic study revealed that the adsorption of MB and MG were exothermic and spontaneous at room temperature. In addition, the regeneration of FMS/PU was conducted to investigate the composite efficiency in adsorbing dyes for several cycles. The results showed that the FMS/PU composite could be regenerated up to four times when the regeneration efficiency dropped drastically to less than 20.0%. The impregnation of FMS onto PU foam also minimised the adsorbent loss into the environment. MDPI 2022 Article PeerReviewed Ahmad, Afiqah and Md. Jamil, Siti Nurul Ain and Choong, Thomas S. Y. and Abdullah, Abdul Halim and Faujan, Nur Hana and Adeyi, Abel A. and Daik, Rusli and Othman, Nurhanisah (2022) Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process. Polymers, 14 (24). art. no. 5416. pp. 1-23. ISSN 2073-4360 https://www.mdpi.com/2073-4360/14/24/5416 10.3390/polym14245416 |
| spellingShingle | Ahmad, Afiqah Md. Jamil, Siti Nurul Ain Choong, Thomas S. Y. Abdullah, Abdul Halim Faujan, Nur Hana Adeyi, Abel A. Daik, Rusli Othman, Nurhanisah Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process |
| title | Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process |
| title_full | Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process |
| title_fullStr | Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process |
| title_full_unstemmed | Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process |
| title_short | Removal of cationic dyes by iron modified silica/polyurethane composite: kinetic, isotherm and thermodynamic analyses, and regeneration via advanced oxidation process |
| title_sort | removal of cationic dyes by iron modified silica polyurethane composite kinetic isotherm and thermodynamic analyses and regeneration via advanced oxidation process |
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