The reactivity of Fe/Ni colloid stabilized by carboxymethylcellulose (CMC-Fe/Ni) toward chloroform
The use of stabilizers can prevent the reactivity loss of nanoparticles due to aggregation. In this study, carboxymethylcellulose (CMC) was selected as the stabilizer to synthesize a highly stable CMC-stabilized Fe/Ni colloid (CMC-Fe/Ni) via pre-aggregation stabilization. The reactivity of CMC-Fe/Ni was evaluated via the reaction of chloroform (CF) degradation. The effect of background solution which composition was affected by the preparation of Fe/Ni (Fe/Ni precursors, NaBH4 dosage) and the addition of solute (common ions, sulfur compounds) on the reactivity of CMC-Fe/Ni was also investigated. Additionally, the dried CMC-Fe/Ni was used for characterization in terms of scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The experimental results indicated that CMC stabilization greatly improved the reactivity of Fe/Ni bimetal and CF (10 mg/L) could be completely degraded by CMC-Fe/Ni (0.1 g/L) within 45 min. The use of different Fe/Ni precursors resulting in the variations of background solution seemed to have no obvious influence on the reactivity of CMC-Fe/Ni, whereas the dosage of NaBH4 in background solution showed a negative correlation with the reactivity of CMC-Fe/Ni. Besides, the individual addition of external solutes into background solution all had an adverse effect on the reactivity of CMC-Fe/Ni, of which the poisoning effect of sulfides (Na2S, Na2S2O4) was significant than common ions and sulfite.
KeywordsBimetal Fe/Ni Stabilization CF Dechlorination
This work was supported by the National Natural Science Foundation of China (50578151) and the National Science and Technology Major Project of China (2015ZX07406-005; 2016YFC0209205).
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Conflict of interest
The authors declare that they have no conflict of interest.
- Cirtiu CM, Raychoudhury T, Ghoshal S, Moores A (2011) Systematic comparison of the size, surface characteristics and colloidal stability of zero valent iron nanoparticles pre-and post-grafted with common polymers. Colloids Surf Physicochem Eng Asp 390(1–3):95–104. https://doi.org/10.1016/j.colsurfa.2011.09.011 CrossRefGoogle Scholar
- Grieger KD, Fjordbøge A, Hartmann NB, Eriksson E, Bjerg PL, Baun A (2010) Environmental benefits and risks of zero-valent iron nanoparticles (nZVI) for in situ remediation: risk mitigation or trade-off? J Contam Hydrol 118(3–4):165–183. https://doi.org/10.1016/j.jconhyd.2010.07.011 CrossRefGoogle Scholar
- Liu ZT, Gu CG, Ye M, Bian YR, Cheng YW, Wang F, Yang XL, Song Y, Jiang X (2015) Debromination of polybrominated diphenyl ethers by attapulgite-supported Fe/Ni bimetallic nanoparticles: influencing factors, kinetics and mechanism. J Hazard Mater 298:328–337. https://doi.org/10.1016/j.jhazmat.2015.05.032 CrossRefGoogle Scholar
- Phenrat T, Saleh N, Sirk K, Kim HJ, Tilton RD, Lowry GV (2008) Stabilization of aqueous nanoscale zerovalent iron dispersion by anionic polyelectrolytes: adsorbed anionic polyelectrolyte layer properties and their effect on aggregation and sedimentation. J Nanopart Res 10(5):795–814CrossRefGoogle Scholar
- Wu J, Yi YQ, Li YQ, Fang ZQ, Tsang EP (2016) Excellently reactive Ni/Fe bimetallic catalyst supported by biochar for the remediation of decabromodiphenyl contaminated soil: reactivity, mechanism, pathways and reducing secondary risks. J Hazard Mater 320:341–349. https://doi.org/10.1016/j.jhazmat.2016.08.049 CrossRefGoogle Scholar