| Title | Utilization of coal fly ash waste for effective recapture of phosphorus from waters |
|---|---|
| ID_Doc | 21377 |
| Authors | Xu, R; Lyu, T; Wang, LJ; Yuan, YT; Zhang, MY; Cooper, M; Mortimer, RJG; Yang, QP; Pan, G |
| Title | Utilization of coal fly ash waste for effective recapture of phosphorus from waters |
| Year | 2022 |
| Published | |
| Abstract | Reutilization of the waste by-products from industrial and agricultural activities is crucially important towards attainment of environmental sustainability and the 'circular economy'. In this study, we have developed and evaluated a sustainably-sourced adsorbent from coal fly ash, which was modified by a small amount of lanthanum (La-FA), for the recapture of phosphorous (P) from both synthetic and real natural waters. The prepared La-FA adsorbent possessed typical characteristic diffraction peaks similar to zeolite type Na-P1, and the BET surface area of La-FA was measured to be 10.9 times higher than that of the original FA. Investigation of P adsorption capability indicated that the maximum adsorption (10.8 mg P g-1) was 6.14 times higher than that (1.8 mg P g-1) of the original fly ash material. The zeta potentials measurement and P K-edge X-ray Absorption Near Edge Structure (XANES) spectra demonstrated that P was bonded on La-FA surfaces via an adsorption mechanism. After applying the proposed adsorbent to real lake water with La/P molar ratios in the range from 0.5:1 to 3:1, the La-FA adsorbent showed the highest phosphate removal ability with a La/P molar ratio 1:1, and the P adsorption was similar to that performance with the synthetic solution. Moreover, the La-FA absorbent produced a negligible effect on the concentrations of total dissolved nitrogen (TDN), NH4+-N and NO3--N in water. This study thus provides a potential material for effective P recapture and details of its operation. |
| https://irep.ntu.ac.uk/id/eprint/44361/1/1476273_Pan.pdf |
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