engleski

Plasma spectrometry in analysis of metal species sorption on zero-valent iron nanoparticles

Analytical applications of engineered nanoparticles are generally focused to utilize produced nanomaterials for preconcentration and extraction procedures. [1] Among variety of produced nanomaterials, the zero-valent iron nanoparticles (nZVI) demonstrated the great potential in sorption and removal of specific hazardous substances from environment. [2] The exceptional properties of iron nanoparticles in removal of heavy metals and organic pollutants from water solutions are durability, corrosion resistance, large surface area, and cost effectiveness. The sorption efficiency of nanomaterials is often determined by imaging of solid particles by SEM or XRD methods, while studies that concern the changes in treated solutions are rarely described. Inductively plasma optical emission spectrometry (ICP-OES) provides sensitive simultaneous measurements of different emission lines in solutions of complex matrix. Therefore, it was adopted in our study of nZVI application for remediation purposes. Synthesis of nZVI particles was performed by the method of ferric iron reduction using sodium borohydride, along with subsequent functionalization by selected organic compounds. As an example of “green” organic coating reagent, the dipicolinic acid was used. Systematic characterization of bare and coated nZVI was obtained by XRD and SEM studies. The extraction capabilities of both kind of prepared nZVI particles were tested during experiments on model aqueous solutions containing metals, i.e. cadmium and chromium species. The concentration of adsorbed and residual metal species was determined by ICP- OES method. The matrix effects of bare and coated nZVI particles, which denotes to coexisted iron that was released from nanoparticles into solution, were also evaluated using ICP-OES method. The sensitive plasma spectrometry measurements of starting and residual metal content showed that functionalization of nZVI particles has improved the removal efficiency of examined species from aqueous solutions. It is also showed that plasma spectrometry offer a new insight into complex mechanisms of reactivity of nanoparticles in solutions.

Iron Nanoparticles ; ICP-AES

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