Utilization of coal fly ash waste for effective recapture of phosphorus from waters

Xu, R., Lyu, T., Wang, L., Yuan, Y., Zhang, M., Cooper, M. ORCID: 0000-0002-1864-1434, Mortimer, R.J.G., Yang, Q. and Pan, G. ORCID: 0000-0003-0920-3018, 2022. Utilization of coal fly ash waste for effective recapture of phosphorus from waters. Chemosphere, 287 (4): 132431. ISSN 0045-6535

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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 ζ 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.

Item Type: Journal article
Publication Title: Chemosphere
Creators: Xu, R., Lyu, T., Wang, L., Yuan, Y., Zhang, M., Cooper, M., Mortimer, R.J.G., Yang, Q. and Pan, G.
Publisher: Elsevier BV
Date: January 2022
Volume: 287
Number: 4
ISSN: 0045-6535
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Laura Ward
Date Added: 08 Oct 2021 10:06
Last Modified: 08 Oct 2021 10:06
URI: http://irep.ntu.ac.uk/id/eprint/44361

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