Abstract
Phosphate removal from water by lanthanum-modified tobermorite synthesized from fly ash (LTFA) with different lanthanum concentrations was studied. LTFA samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and Brunauer‒Emmett‒Teller specific surface area analysis. The results showed that the LTFA samples were mainly composed of mesoporous tobermorite-11 Å, and LTFA1 with a lanthanum concentration of 0.15 M had a high specific surface area (83.82 m2/g) and pore volume (0.6778 cm3/g). The phosphate adsorption capacities of LTFA samples were highest at pH 3 and gradually decreased with increasing pH. The phosphate adsorption kinetics data on LTFA samples were most accurately described by the Elovich model. The adsorption isotherms were in the strongest agreement with the Temkin model, and LTFA1 showed the highest phosphate adsorption capacity (282.51 mg P/g), which was higher than that of most other lanthanum-modified adsorbents. LTFA1 presented highly selective adsorption of phosphate with other coexisting ions (HCO3−, Cl−, SO42−, and NO3−). In addition, phosphate was adsorbed onto LTFA samples by forming inner-sphere phosphate complexes and amorphous lanthanum phosphate. This study provides technical support for development of efficient fly ash-based phosphate adsorbents.
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Abbreviations
- FTIR:
-
Fourier transform and infrared spectroscopy
- LTFA:
-
Lanthanum-modified tobermorite synthesized from fly ash
- SEM:
-
Scanning electron microscopy
- SEM‒EDS:
-
Scanning electron microscope‒energy dispersive spectroscopy
- XPS:
-
X-ray photoelectron spectroscopy
- XRD:
-
X-ray diffraction
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This study was financially supported by the National Natural Science Foundation of China (No. 52004128) and Natural Science Foundation of Jiangxi Province (No. 20224BAB213054).
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Zehua Wang: Conceptualization; Methodology; Project administration; Supervision; Writing—review & editing. Guanyu Zhu: Investigation; Data curation; Writing—original draft. Yongwei Zhou: Investigation. Zhencheng Wen: Investigation. Daishe Wu: Resources; Writing—review & editing.
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Wang, Z., Zhu, G., Zhou, Y. et al. Lanthanum-modified tobermorite synthesized from fly ash for efficient phosphate removal. Environ Sci Pollut Res 31, 29584–29594 (2024). https://doi.org/10.1007/s11356-024-33153-9
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DOI: https://doi.org/10.1007/s11356-024-33153-9