| 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 |
|
| DOI |
10.1016/j.chemosphere.2021.132431 |
| 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. |
| Author Keywords |
Circular economy; Coal fly ash; Eutrophication management; Lanthanum modification; Phosphorus adsorbent |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000704944200008 |
| WoS Category |
Environmental Sciences |
| Research Area |
Environmental Sciences & Ecology |
| PDF |
https://irep.ntu.ac.uk/id/eprint/44361/1/1476273_Pan.pdf
|