Utilization of Waste Adsorbent Generated after Ca/Al-LDH Adsorption of High-Concentration Phosphate: Fluorine Removal
Publication: Journal of Environmental Engineering
Volume 149, Issue 1
Abstract
Ca–Al-layered double hydroxide (Ca/Al-LDH) is an excellent sorbent for wastewater decontamination and is widely used in the treatment of this phosphate and fluoride-containing wastewater. In this study, we propose a strategy using the wastes generated from treating high-concentration phosphate wastewater process to treat fluoride wastewater to maximize the value of LDH. The effects of environmental parameters such as reaction time, initial fluoride and phosphate concentrations, adsorbent concentration, and pH were investigated. The experimental results showed that when the initial concentration was , the removal rates of were over 90%. To further understand the adsorption mechanism of on solid waste, we employed characterization methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR), which were also able to characterize the adsorption products before and after the reaction. It was found that hydroxyapatite was formed after the removal of phosphate, while fluorapatite was formed at the F-substituted hydroxyl position after the removal of fluorine. The adsorption process of fluorine removal is a spontaneous endothermic adsorption process. This study shows that Ca/Al-LDH can be a promising material with a high development value, and the new strategy of sequentially removing phosphorus and fluorine using this material can maximize the value of this adsorbent.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was funded by the Program of the National Science Foundation of China (41672040). Peng Cheng thanks the Chinese scholarship council for its financial support and thanks Professor Gilles Maillot for his help with article correction.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 149 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 17, 2022
Accepted: Sep 6, 2022
Published online: Nov 12, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 12, 2023
ASCE Technical Topics:
- Adsorption
- Chemical compounds
- Chemical processes
- Chemicals
- Chemistry
- Engineering fundamentals
- Engineering materials (by type)
- Environmental engineering
- Fluoride
- Industrial wastes
- Materials engineering
- Mathematics
- Parameters (statistics)
- Phosphate
- Pollutants
- Recycling
- Salts
- Solid wastes
- Sorption
- Statistics
- Waste management
- Waste treatment
- Wastes
- Wastewater management
- Wastewater treatment
- Water treatment
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