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: https://orcid.org/0000-0002-1864-1434, Mortimer, RJG, Yang, Q and Pan, G ORCID: https://orcid.org/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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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 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
Identifiers:	Number Type 10.1016/j.chemosphere.2021.132431 DOI 1476273 Other
Divisions:	Schools > School of Animal, Rural and Environmental Sciences
Record created by:	Laura Ward
Date Added:	08 Oct 2021 10:06
Last Modified:	01 Oct 2022 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/44361

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