Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment
Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2021/3833737 |
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| author | Ebenezer Annan Grace Karikari Arkorful David Sasu Konadu Bernard Asimeng David Dodoo-Arhin Martin Egblewogbe |
| author_facet | Ebenezer Annan Grace Karikari Arkorful David Sasu Konadu Bernard Asimeng David Dodoo-Arhin Martin Egblewogbe |
| author_sort | Ebenezer Annan |
| collection | DOAJ |
| description | Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). The synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). The removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. The combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. The HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. The thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. This work confirms the potential of HAP-clay composites in removing MB from water. |
| format | Article |
| id | doaj-art-8fa7b1c8c3964e90a19ae1bb9c2e32b0 |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-8fa7b1c8c3964e90a19ae1bb9c2e32b02025-02-03T05:43:47ZengWileyJournal of Chemistry2090-90632090-90712021-01-01202110.1155/2021/38337373833737Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water TreatmentEbenezer Annan0Grace Karikari Arkorful1David Sasu Konadu2Bernard Asimeng3David Dodoo-Arhin4Martin Egblewogbe5Department of Materials Science and Engineering, School of Engineering Sciences, University of Ghana, Legon, Accra, GhanaDepartment of Materials Science and Engineering, School of Engineering Sciences, University of Ghana, Legon, Accra, GhanaDepartment of Materials Science and Engineering, School of Engineering Sciences, University of Ghana, Legon, Accra, GhanaDepartment of Biomedical Engineering, School of Engineering Sciences, University of Ghana, Legon, Accra, GhanaDepartment of Materials Science and Engineering, School of Engineering Sciences, University of Ghana, Legon, Accra, GhanaDepartment of Physics, University of Ghana, Legon, Accra, GhanaDyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). The synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). The removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. The combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. The HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. The thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. This work confirms the potential of HAP-clay composites in removing MB from water.http://dx.doi.org/10.1155/2021/3833737 |
| spellingShingle | Ebenezer Annan Grace Karikari Arkorful David Sasu Konadu Bernard Asimeng David Dodoo-Arhin Martin Egblewogbe Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment Journal of Chemistry |
| title | Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment |
| title_full | Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment |
| title_fullStr | Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment |
| title_full_unstemmed | Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment |
| title_short | Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment |
| title_sort | synthesis and characterization of hydroxyapatite hap clay composites and adsorption studies on methylene blue for water treatment |
| url | http://dx.doi.org/10.1155/2021/3833737 |
| work_keys_str_mv | AT ebenezerannan synthesisandcharacterizationofhydroxyapatitehapclaycompositesandadsorptionstudiesonmethyleneblueforwatertreatment AT gracekarikariarkorful synthesisandcharacterizationofhydroxyapatitehapclaycompositesandadsorptionstudiesonmethyleneblueforwatertreatment AT davidsasukonadu synthesisandcharacterizationofhydroxyapatitehapclaycompositesandadsorptionstudiesonmethyleneblueforwatertreatment AT bernardasimeng synthesisandcharacterizationofhydroxyapatitehapclaycompositesandadsorptionstudiesonmethyleneblueforwatertreatment AT daviddodooarhin synthesisandcharacterizationofhydroxyapatitehapclaycompositesandadsorptionstudiesonmethyleneblueforwatertreatment AT martinegblewogbe synthesisandcharacterizationofhydroxyapatitehapclaycompositesandadsorptionstudiesonmethyleneblueforwatertreatment |