Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars
Adsorption of methylene blue (MB) dye from an aqueous solution onto hydrochars produced from brown seaweed (<i>Fucus Serratus</i>) (FS-HC), coconut shell (CS-HC), and oak wood (Oak-HC) at different temperatures (200–250 °C) was investigated in a batch system. Response surface modelling (...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/5/977 |
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| author | Eric Danso-Boateng Melissa Fitzsimmons Andrew B. Ross Ted Mariner |
| author_facet | Eric Danso-Boateng Melissa Fitzsimmons Andrew B. Ross Ted Mariner |
| author_sort | Eric Danso-Boateng |
| collection | DOAJ |
| description | Adsorption of methylene blue (MB) dye from an aqueous solution onto hydrochars produced from brown seaweed (<i>Fucus Serratus</i>) (FS-HC), coconut shell (CS-HC), and oak wood (Oak-HC) at different temperatures (200–250 °C) was investigated in a batch system. Response surface modelling (RSM) was used to investigate the effect of initial MB concentration (50–300 mg/L), contact time (0–240 min), and solution pH (2–12) on the adsorption process. RSM was also used to model and optimise these parameters for efficient adsorption. Kinetic and isotherms studies were carried out to study the adsorption mechanism onto the hydrochars. It was found that the best adsorbent from the RSM model was FS-HC200, and the optimal conditions for greater MB dye uptake were lower initial MB concentration (50 mg/L), pH 6 and contact time of 84 min; removing >99% of MB. Langmuir and Redlich–Peterson isotherm models fitted the adsorption of MB onto hydrochars prepared at 200 and 250 °C. Freundlich and Redlich–Peterson isotherms were suitable for hydrochars produced at 220 °C. FS-HCs have the highest maximum adsorption capacity of MB of about (8.60–28.57) mg/g calculated from the Langmuir isotherm. The adsorption process for all the hydrochars followed a pseudo-second-order model (R<sup>2</sup> = 0.96–1.00), and film diffusion and intraparticle diffusion were the rate-determining steps. Therefore, this work identifies cheap adsorbents from biowaste that are effective for the removal of cationic pollutants from wastewater. |
| first_indexed | 2024-03-11T07:06:13Z |
| format | Article |
| id | doaj.art-11ec49337790441781b57fbbae556c20 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T07:06:13Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-11ec49337790441781b57fbbae556c202023-11-17T08:55:45ZengMDPI AGWater2073-44412023-03-0115597710.3390/w15050977Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood HydrocharsEric Danso-Boateng0Melissa Fitzsimmons1Andrew B. Ross2Ted Mariner3School of Chemical and Process Engineering, University of Leeds, LS2 9JT, UKSchool of Chemical and Process Engineering, University of Leeds, LS2 9JT, UKSchool of Chemical and Process Engineering, University of Leeds, LS2 9JT, UKSchool of Chemical and Process Engineering, University of Leeds, LS2 9JT, UKAdsorption of methylene blue (MB) dye from an aqueous solution onto hydrochars produced from brown seaweed (<i>Fucus Serratus</i>) (FS-HC), coconut shell (CS-HC), and oak wood (Oak-HC) at different temperatures (200–250 °C) was investigated in a batch system. Response surface modelling (RSM) was used to investigate the effect of initial MB concentration (50–300 mg/L), contact time (0–240 min), and solution pH (2–12) on the adsorption process. RSM was also used to model and optimise these parameters for efficient adsorption. Kinetic and isotherms studies were carried out to study the adsorption mechanism onto the hydrochars. It was found that the best adsorbent from the RSM model was FS-HC200, and the optimal conditions for greater MB dye uptake were lower initial MB concentration (50 mg/L), pH 6 and contact time of 84 min; removing >99% of MB. Langmuir and Redlich–Peterson isotherm models fitted the adsorption of MB onto hydrochars prepared at 200 and 250 °C. Freundlich and Redlich–Peterson isotherms were suitable for hydrochars produced at 220 °C. FS-HCs have the highest maximum adsorption capacity of MB of about (8.60–28.57) mg/g calculated from the Langmuir isotherm. The adsorption process for all the hydrochars followed a pseudo-second-order model (R<sup>2</sup> = 0.96–1.00), and film diffusion and intraparticle diffusion were the rate-determining steps. Therefore, this work identifies cheap adsorbents from biowaste that are effective for the removal of cationic pollutants from wastewater.https://www.mdpi.com/2073-4441/15/5/977<i>Fucus Serratus</i>hydrocharhydrothermal carbonisationmethylene blueresponse surface modellingseaweed |
| spellingShingle | Eric Danso-Boateng Melissa Fitzsimmons Andrew B. Ross Ted Mariner Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars Water <i>Fucus Serratus</i> hydrochar hydrothermal carbonisation methylene blue response surface modelling seaweed |
| title | Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars |
| title_full | Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars |
| title_fullStr | Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars |
| title_full_unstemmed | Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars |
| title_short | Response Surface Modelling of Methylene Blue Adsorption onto Seaweed, Coconut Shell and Oak Wood Hydrochars |
| title_sort | response surface modelling of methylene blue adsorption onto seaweed coconut shell and oak wood hydrochars |
| topic | <i>Fucus Serratus</i> hydrochar hydrothermal carbonisation methylene blue response surface modelling seaweed |
| url | https://www.mdpi.com/2073-4441/15/5/977 |
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