Varying growth behavior of redox-sensitive nanoparticles on 1:1 and 2:1 clay surfaces: mechanistic insights on preferential toxic ions removal in mono, co and multi-metal contaminated waters - Université de Rennes Accéder directement au contenu
Article Dans Une Revue (Article De Synthèse) Chemical Engineering Journal Année : 2023

Varying growth behavior of redox-sensitive nanoparticles on 1:1 and 2:1 clay surfaces: mechanistic insights on preferential toxic ions removal in mono, co and multi-metal contaminated waters

Résumé

In the current study, contrasting growth behaviour of redox sensitive Fe0 nanoparticles (nZVI) was observed on different clay surfaces i.e., 1:1 non-swelling kaolinite (K-nZVI) and 2:1 swelling bentonite (B-nZVI). Osmotic swelling of bentonite led to Fe0 nucleation and growth of 5-7 nm size particles in the broadened interlayer spaces. B-nZVI had negative zeta potential due to the domination of the surface charge of bentonite clay. Whereas kaolinite has shown dominant surface growth of nZVI particles (>24.8±7.4 nm) and positive zeta potential, suggesting domination of Fe0 nanoparticles (nZVI) characteristics. This surface-dependent variation led to higher and faster removal of oxy-anions with K-nZVI, i.e., chromium and arsenic (87.5 and 157.35 mg/g) than B-nZVI (18.4 and 86.9 mg/g). In comparison, B-nZVI has shown higher sorption of cations i.e., nickel and cadmium (36 mg/g and 46 mg/g) than K-nZVI (25 and 27 mg/g). XPS and pXRD analysis of reaction precipitates confirmed reductive sorption of chromium, co-precipitation/ complexation of arsenic, electrostatic attraction and complexation of nickel and cadmium as major removal mechanisms. Drastically higher total contaminant sorption capacities of B-nZVI (327 mg/g) and K-nZVI (372 mg/g) in multicontaminant (Cr+As+Ni+Cd) solutions than individual capacities in mono-ionic solutions was due to co-operative effects and newer sites induced via sorption and redox-transformation of other ionic species. K-nZVI removed chromium and arsenic to below drinking water permissible limits whereas B-nZVI succeeded in separating nickel and cadmium to drinkable levels in groundwater, freshwater, river water, and wastewater samples, emphasizing their applicability in high cationic—low anionic and low cationic-higher anionic species contaminated waters, respectively.
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insu-03997222 , version 1 (20-02-2023)

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Nitin Khandelwal, Nisha Singh, Ekta Tiwari, Remi Marsac, Dieter Schild, et al.. Varying growth behavior of redox-sensitive nanoparticles on 1:1 and 2:1 clay surfaces: mechanistic insights on preferential toxic ions removal in mono, co and multi-metal contaminated waters. Chemical Engineering Journal, 2023, 461, pp.141883. ⟨10.1016/j.cej.2023.141883⟩. ⟨insu-03997222⟩
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