Naslov
Analysis of chromium immobilization on zero-valent iron nanoparticles by ICP-AES method

Autori
Nemet, Ivan ; Rončević, Sanda ; Toth, Leontina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
European Winter Conference on Plasma Spectrochemistry / - , 2019, 41-41

Skup
European Winter Conference on Plasma Spectrochemistry (EWCPS 2019)

Mjesto i datum
Pau, Francuska, 03.02.2019. - 08.02.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Chromium (VI), ICP, AES, Iron Nanoparticles

Sažetak
Nanomaterials have attracted the greatest interest as a fast growing class of materials for very different kind of applications considering their various properties, such as their increased reactivity at lower level. [1, 2] Practical functionality of zero-valent iron nanoparticles (nZVI) is broadly customized in procedures such as analytical preconcentration and extraction. It is due to their chemical stability, large surface area, durability, corrosion resistance, and cost effectiveness. Many recent studies have put in focus reductive immobilization of potentially toxic metal species on iron nanoparticles. For the determination of removal efficiency, scanning emission microscopy or X-ray diffraction are often used. However, there is a lack of studies concerning the changes of solution, especially aqueous solution. [3] In this work, the ICP-AES method for quantitative analysis of chromium (VI) removal from water by nanoscale iron was applied. Zero-valent iron nanoparticles (nZVI) were freshly prepared by reduction of ferric iron with sodium borohydride. The morphology of prepared particles were characterized by XRD and SEM analyses. The extraction capabilities of synthesized particles were tested on model aqueous solutions containing hexavalent chromium species. The initial concentration range of Cr (VI) in water solutions was adjusted from 0.1- 100 ppm. Reductive immobilization of hexavalent chromium on nZVI was examined in two sets of experiments. The first one was performed with bare nanoparticles and the second one with modification of surface by addition of 1, 5- diphenylcarbazide that is common reagent in chromium speciation. Separation of particles from solution was achieved using solid phase extraction (SPE). The chromium content was determined in filtrate solution and in separated particles that were dissolved before ICP-AES analysis. Measurement was performed on several chromium lines of different sensitivity. The removal of chromium was maximally efficient (95%) at concentration range up to 2 ppm. The efficiency of removal decreased in upper range (43-21%). By comparison of two sets of experiments it was observed that slightly better removal efficiency is showed after functionalization of nZVI particles with 1, 5-diphenylcarbazide and it was more pronounced in lower concentration range. ICP- AES determination has confirmed the immobilization of chromium (VI) on nZVI particles. Moreover, it was helpful in estimation of magnitude of adsorption that occur on nanoparticles surface in aqueous solutions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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