Issue 21, 2016

Remediation of Cd(ii)-contaminated soil by three kinds of ferrous phosphate nanoparticles

Abstract

The remediation of cadmium-contaminated soil has become a great concern because Cd will bring high health risk. Three kinds of iron phosphate nanoparticles, Fe3(PO4)2, FeHPO4 and Fe(H2PO4)2, were synthesized to reduce the leachability and bioaccessibility of soil-bound Cd. The Cd leachability was evaluated by a toxicity characteristic leaching procedure (TCLP) and in vitro bioaccessibility was evaluated by physiological based extraction test (PBET). After equilibrating for 42 days, the concentrations of TCLP were reduced from 4.43 to 0.99, 1.42 and 1.63 mg Lāˆ’1 at a dosage of 4.5 mg PO4 gāˆ’1 soil with Fe3(PO4)2, FeHPO4 and Fe(H2PO4)2, respectively. Meanwhile the bioaccessibility of Cd was reduced by 22.4, 10.6 and 20.7%. The results showed that the nanoparticles were highly effective at amending Cd in soils and the best material for immobilizing Cd was Fe3(PO4)2. Results from sequential extraction procedures (SEP) showed a great decrease in exchangeable Cd and a concomitant increase in Cd residual fraction, suggesting that the formation of cadmium phosphate through precipitation was responsible for the decrease of Cd availability in soils. Moreover, because stable ferrous phosphate nanoparticles would bring less P residue than other soluble phosphate, they can be further optimized to prepare for practical application.

Graphical abstract: Remediation of Cd(ii)-contaminated soil by three kinds of ferrous phosphate nanoparticles

Article information

Article type
Paper
Submitted
05 Nov 2015
Accepted
02 Feb 2016
First published
11 Feb 2016

RSC Adv., 2016,6, 17390-17395

Remediation of Cd(II)-contaminated soil by three kinds of ferrous phosphate nanoparticles

Y. Xu, X. Yan, L. Fan and Z. Fang, RSC Adv., 2016, 6, 17390 DOI: 10.1039/C5RA23299F

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