engleski

Inductively Coupled Plasma Spectrometry for the Analysis of Engineered Iron Nanoparticles

Engineered nanoparticles have special physical and chemical properties that differ from larger substances of the same composition and therefore, they have gained the greatest interest in wide areas of materials production and use. Analytical applications are mainly focused to utilize nanomaterials for preconcentration and extraction procedures.[1] Due to large surface area, durability, corrosion resistance, and cost effectiveness, zero-valent iron nanoparticles (nZVI) demonstrated the great potential in removing of specific hazardous substances, such as heavy metals and PCBs from water solutions.[2] Removal efficiency 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. Analytical performances of inductively plasma optical emission spectrometry (ICP-OES) provide sensitive simultaneous measurements of different emission lines in solutions of complex matrix and therefore, it was adopted in our study of nZVI applications. Synthesis of nZVI particles was performed in ethanolic medium by the method of ferric iron reduction using sodium borohydride, along with subsequent functionalization by different organic ligands. A systematic characterization of nZVI was obtained by XRD and SEM studies. The matrix effects of bare and coated nZVI particles, which denotes to coexisted iron released from nanoparticles into solution, were studied using ICP-OES method. The extraction capabilities of nZVI were tested and optimized to mass fraction used in the experiments on model aqueous solutions containing hexavalent chromium species. The sensitive plasma spectrometry measurements of starting and residual chromium content showed that functionalization of nZVI particles has improved the removal efficiency of Cr (VI) from aqueous solutions.

Chromium (VI) ; ICP spectrometry ; Zero-valent iron nanoparticles

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