LAPSE:2023.1001
Published Article
LAPSE:2023.1001
Adsorption of Phosphates onto Mg/Al-Oxide/Hydroxide/Sulfate-Impregnated Douglas Fir Biochar
February 21, 2023
Abstract
Nitrates and phosphates, found in fertilizers, are the most common eutrophication-causing agents. Douglas fir biochar (BC), a syngas byproduct, was treated with different Al/Mg ratios of sulfate (5% w/w metal loading) followed by an NaOH treatment. The greatest phosphate uptake at 25 °C and pH 7 was attributed to the composite with a Mg/Al 2:1 ratio prepared at pH 13 (AMBC). Batch AMBC phosphate uptake was optimized for initial pH, equilibrium time, temperature, and initial phosphate concentration. Phosphate removal following pseudo-2nd-order kinetics and increases gradually before reaching a max at pH 11, with 95% phosphate uptake in 15 mins. The Sips isotherm model provided the best sorption data fit resulting in a 42.1 mg/g capacity at 25 °C and pH 11. Endothermic and spontaneous adsorption were determined using van ’t Hoff’s plots. BET, XRD, XPS, SEM, TEM, and EDS were used to characterize the biochar before and after phosphate sorption. Used AMBC has the potential to be exploited as a phosphate fertilizer as a key part of an environmentally friendly agricultural management plan.
Nitrates and phosphates, found in fertilizers, are the most common eutrophication-causing agents. Douglas fir biochar (BC), a syngas byproduct, was treated with different Al/Mg ratios of sulfate (5% w/w metal loading) followed by an NaOH treatment. The greatest phosphate uptake at 25 °C and pH 7 was attributed to the composite with a Mg/Al 2:1 ratio prepared at pH 13 (AMBC). Batch AMBC phosphate uptake was optimized for initial pH, equilibrium time, temperature, and initial phosphate concentration. Phosphate removal following pseudo-2nd-order kinetics and increases gradually before reaching a max at pH 11, with 95% phosphate uptake in 15 mins. The Sips isotherm model provided the best sorption data fit resulting in a 42.1 mg/g capacity at 25 °C and pH 11. Endothermic and spontaneous adsorption were determined using van ’t Hoff’s plots. BET, XRD, XPS, SEM, TEM, and EDS were used to characterize the biochar before and after phosphate sorption. Used AMBC has the potential to be exploited as a phosphate fertilizer as a key part of an environmentally friendly agricultural management plan.
Record ID
Keywords
Adsorption, aluminum, biochar, magnesium, oxide, phosphate
Subject
Suggested Citation
Navarathna CM, Pennisson JE, Dewage NB, Reid C, Dotse C, Jazi ME, Rodrigo PM, Zhang X, Farmer E, Watson C, Craig DO, Ramirez A, Walker M, Madduri S, Mohan D, Mlsna TE. Adsorption of Phosphates onto Mg/Al-Oxide/Hydroxide/Sulfate-Impregnated Douglas Fir Biochar. (2023). LAPSE:2023.1001
Author Affiliations
Navarathna CM: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA [ORCID]
Pennisson JE: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Dewage NB: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Reid C: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Dotse C: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Jazi ME: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Rodrigo PM: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Zhang X: Department of Sustainable Bioproducts, Mississippi State University, Starkville, MS 39762, USA [ORCID]
Farmer E: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Watson C: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Craig DO: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Ramirez A: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Walker M: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Madduri S: Department of Sustainable Bioproducts, Mississippi State University, Starkville, MS 39762, USA [ORCID]
Mohan D: School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India [ORCID]
Mlsna TE: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Pennisson JE: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Dewage NB: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Reid C: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Dotse C: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Jazi ME: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Rodrigo PM: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Zhang X: Department of Sustainable Bioproducts, Mississippi State University, Starkville, MS 39762, USA [ORCID]
Farmer E: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Watson C: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Craig DO: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Ramirez A: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Walker M: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Madduri S: Department of Sustainable Bioproducts, Mississippi State University, Starkville, MS 39762, USA [ORCID]
Mohan D: School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India [ORCID]
Mlsna TE: Department of Chemistry, Mississippi State University, Starkville, MS 39762, USA
Journal Name
Processes
Volume
11
Issue
1
First Page
111
Year
2022
Publication Date
2022-12-31
ISSN
2227-9717
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Original Submission
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PII: pr11010111, Publication Type: Journal Article
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LAPSE:2023.1001
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https://doi.org/10.3390/pr11010111
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Feb 21, 2023
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