ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions
Biochar is a byproduct of biomass pyrolysis that has been identified as an effective and novel bio-adsorbent for contaminant removal from wastewater. A pyrolysis-chemical activation process was used to convert eucalyptus tree bark to activated biochar, which was then characterized using various tech...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | South African Journal of Chemical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1026918522000622 |
| _version_ | 1797996834391588864 |
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| author | Adeyinka S. Yusuff Mayowa A. Lala Kudirat A. Thompson-Yusuff Esther O. Babatunde |
| author_facet | Adeyinka S. Yusuff Mayowa A. Lala Kudirat A. Thompson-Yusuff Esther O. Babatunde |
| author_sort | Adeyinka S. Yusuff |
| collection | DOAJ |
| description | Biochar is a byproduct of biomass pyrolysis that has been identified as an effective and novel bio-adsorbent for contaminant removal from wastewater. A pyrolysis-chemical activation process was used to convert eucalyptus tree bark to activated biochar, which was then characterized using various techniques (BET, SEM, FTIR, EDX, XRD and pHpzc) and used as a bio-adsorbent to remove hexavalent chromium (Cr(VI)) from aqueous solution. The effects of adsorption process conditions (adsorbate concentration, contact time, adsorbent amount and pH) on Cr(VI) removal efficiency were investigated. The best experimental conditions for the maximum equilibrium uptake of Cr(VI) by activated eucalyptus bark biochar (AEBB) were 10 mg/L, 140 min, 6.0 and 0.3 g/L for initial Cr(VI) concentration, contact time, pH and adsorbent amount, respectively. The AEBB's outstanding performance was aided by its high surface area, well-developed porous structure and dominance of active surface functional groups, as validated by BET, SEM and FTIR. The Freundlich model fitted the equilibrium data the best. The pseudo-second-order model appeared to better predict the kinetics of Cr(VI) adsorption onto AEBB, indicating the dominance of chemisorption. |
| first_indexed | 2024-04-11T10:23:47Z |
| format | Article |
| id | doaj.art-73df1fc6fffb46c2afef1af8d5b8f3b3 |
| institution | Directory Open Access Journal |
| issn | 1026-9185 |
| language | English |
| last_indexed | 2024-04-11T10:23:47Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | South African Journal of Chemical Engineering |
| spelling | doaj.art-73df1fc6fffb46c2afef1af8d5b8f3b32022-12-22T04:29:40ZengElsevierSouth African Journal of Chemical Engineering1026-91852022-10-0142138145ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutionsAdeyinka S. Yusuff0Mayowa A. Lala1Kudirat A. Thompson-Yusuff2Esther O. Babatunde3Department of Chemical and Petroleum Engineering, College of Engineering, Afe Babalola University, Ado-Ekiti, Nigeria; Corresponding author.Department of Chemical and Petroleum Engineering, College of Engineering, Afe Babalola University, Ado-Ekiti, NigeriaDepartment of Chemical and Polymer Engineering, Faculty of Engineering, Lagos State University, Epe Campus, Epe, NigeriaDepartment of Chemical Engineering, Faculty of Engineering, University of Ilorin, Ilorin, NigeriaBiochar is a byproduct of biomass pyrolysis that has been identified as an effective and novel bio-adsorbent for contaminant removal from wastewater. A pyrolysis-chemical activation process was used to convert eucalyptus tree bark to activated biochar, which was then characterized using various techniques (BET, SEM, FTIR, EDX, XRD and pHpzc) and used as a bio-adsorbent to remove hexavalent chromium (Cr(VI)) from aqueous solution. The effects of adsorption process conditions (adsorbate concentration, contact time, adsorbent amount and pH) on Cr(VI) removal efficiency were investigated. The best experimental conditions for the maximum equilibrium uptake of Cr(VI) by activated eucalyptus bark biochar (AEBB) were 10 mg/L, 140 min, 6.0 and 0.3 g/L for initial Cr(VI) concentration, contact time, pH and adsorbent amount, respectively. The AEBB's outstanding performance was aided by its high surface area, well-developed porous structure and dominance of active surface functional groups, as validated by BET, SEM and FTIR. The Freundlich model fitted the equilibrium data the best. The pseudo-second-order model appeared to better predict the kinetics of Cr(VI) adsorption onto AEBB, indicating the dominance of chemisorption.http://www.sciencedirect.com/science/article/pii/S1026918522000622AdsorptionEucalyptus bark biocharKineticIsothermEconomic modeling |
| spellingShingle | Adeyinka S. Yusuff Mayowa A. Lala Kudirat A. Thompson-Yusuff Esther O. Babatunde ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions South African Journal of Chemical Engineering Adsorption Eucalyptus bark biochar Kinetic Isotherm Economic modeling |
| title | ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions |
| title_full | ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions |
| title_fullStr | ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions |
| title_full_unstemmed | ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions |
| title_short | ZnCl2-modified eucalyptus bark biochar as adsorbent: preparation, characterization and its application in adsorption of Cr(VI) from aqueous solutions |
| title_sort | zncl2 modified eucalyptus bark biochar as adsorbent preparation characterization and its application in adsorption of cr vi from aqueous solutions |
| topic | Adsorption Eucalyptus bark biochar Kinetic Isotherm Economic modeling |
| url | http://www.sciencedirect.com/science/article/pii/S1026918522000622 |
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