Low concentrated phosphorus sorption in aqueous medium on aragonite synthesized by carbonation of seashells: Optimization, kinetics, and mechanism study
| Autor: | Mohd Danish Khan, Sonam Shakya, Lulit Habte, Hong Ha Thi Vu, Ji-Whan Ahn |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Carbonation 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law engineering.material 01 natural sciences Chloride Calcium Carbonate Phosphates chemistry.chemical_compound Adsorption Animal Shells medicine Animals Waste Management and Disposal Ecosystem 0105 earth and related environmental sciences Aqueous solution Aragonite Phosphorus Water Sorption General Medicine Hydrogen-Ion Concentration Phosphate 020801 environmental engineering Kinetics Chemical engineering chemistry engineering Water Pollutants Chemical medicine.drug |
| Zdroj: | Journal of Environmental Management. 280:111652 |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2020.111652 |
| Popis: | Phosphorus (P) concentration beyond threshold limit can trigger eutrophication in stagnant water bodies nevertheless it is an indispensable macronutrient for aquatic life. Even in low P concentration ( ≤ 1 mg L−1), P can be detrimental for ecosystem's health, but this aspect has not been thoroughly investigated. The elimination of low P content is rather expensive or complex. Therefore, a unique and sustainable approach has been proposed in which valorized bivalve seashells can be used for the removal of low P content. Initially, acicular shaped aragonite particles (~21 μm) with an aspect ratio of around 21 have been synthesized through the wet carbonation process and used to treat aqueous solutions containing P in low concentration (P ≤ 1 mg L−1). Response surface methodology based Box-Behnken design has been employed for optimization study which revealed that with aragonite dosage (140 mg), equilibrium pH (~10.15), and temperature (45 °C), a phosphorus removal efficiency of ~97% can be obtained in 10 h. The kinetics and isotherm studies have also been carried out (within the range P ≤ 1 mg L−1) to investigate a probable removal mechanism. Also, aragonite demonstrates higher selectivity (>70%) towards phosphate with coexisting anions such as nitrate, chloride, sulfate, and carbonate. Through experimental data, elemental mapping, and molecular dynamic simulation, it has been observed that the removal mechanism involved a combination of electrostatic adsorption of Ca2+ ions on aragonite surface and chemical interaction between the calcium and phosphate ions. The present work demonstrates a sustainable and propitious potential of seashell derived aragonite for the removal of low P content in aqueous solution along with its unconventional mechanistic approach. |
| Databáze: | OpenAIRE |
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