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master's thesis
Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina
Zagreb: University of Zagreb, Faculty of Science, 2019. urn:nbn:hr:217:645045
Starešinčić, Valentina
University of Zagreb
Faculty of Science
Department of Chemistry

Institutional repository: Repository of the Faculty of Science

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Starešinčić, V. (2019). Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:645045

Starešinčić, Valentina. "Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina." Master's thesis, University of Zagreb, Faculty of Science, 2019. https://urn.nsk.hr/urn:nbn:hr:217:645045

Starešinčić, Valentina. "Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina." Master's thesis, University of Zagreb, Faculty of Science, 2019. https://urn.nsk.hr/urn:nbn:hr:217:645045

Starešinčić, V. (2019). 'Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina', Master's thesis, University of Zagreb, Faculty of Science, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:645045

Starešinčić V. Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2019 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:217:645045

V. Starešinčić, "Ispitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:217:645045

Metadata
TitleIspitivanje utjecaja modifikacije nanočestica željeza s 1,5-difenilkarbazidom pri sorpciji kroma iz vodenih otopina
Title (english)Investigation of effects of 1,5-diphenylcarbazide modifyed iron nanoparticles on chromium sorption from aquoeous solutions
AuthorValentina Starešinčić
MentorSanda Rončević (mentor)
Committee memberSanda Rončević (predsjednik povjerenstva)
Committee memberIvana Biljan (član povjerenstva)
Committee memberBiserka Prugovečki (član povjerenstva)
Committee memberIva Juranović Cindrić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
Defense date and country2019-09-24, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
U radu je ispitano uklanjanje kroma(VI) iz modelnih vodenih otopina pomoću neutralnih i modificiranih nanočestica željeza. Pri tome su sintetizirane neutralne nanočestice željeza redukcijom iona željeza(III) iz vodene otopine natrijevim borhidridom. Nanočestice su modificirane s 1,5difenilkarbazidom u različitim molarnim omjerima liganda i željeza: 1:2, 1:1, 3:2 i 2:1. Sintetizirane nanočestice okarakterizirane su metodama strukturne analize: infracrvenom spektroskopijom (FT-IR), pretražnom elektronskom mikroskopijom (SEM) i difrakcijom rendgenskog zračenja u polikristalnom uzorku (XRD). Rezultati su pokazali da se čestice sastoje od magnetita i α-željeza. Nakon funkcionalizacije dolazi do promjene dendritične strukture nanočestica u aglomerate s manjim srednjim promjerom sfera. Preliminarna ispitivanja učinkovitosti sorpcije kroma(VI) provedena su UV/Vis spektrofotometrijom. Uklanjanje kroma iz modelnih vodenih otopina nakon sorpcije na modificiranim i neutralnim nanočesticama praćeno je emisijskom spektrometrijom uz induktivno spregnutu plazmu (ICP-AES). Udio uklonjenog kroma varira između 79 % i 91 %. Rezultati su pokazali da je učinkovitost uklanjanja kroma(VI) izraženija uz dodatak 1,5-difenilkarbazida.
Abstract (english)
Removal of chromium(VI) from model aqueous solution using bare and modified iron nanoparticles was investigated. Zero-valent iron nanoparticles were synthesized by sodium borohydride reduction of iron(III) ions in water solution. Nanoparticles were functionalized by addition of 1,5diphenylcarbazide in different molar ratios of ligand and iron (1:1; 1:2; 3:2; 2:1). Synthesized nanoparticles were characterized by structural analysis methods such as infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and X-ray diffraction of polycrystals (XRD). It was found that particles consisted of magnetite and α-Fe. Dendritic structure of bare particles was changed after functionalization into agglomerates along with decrease of average diameter of spheres. Preliminary test of chromium removal efficiency was performed using UV/VIS spectrophotometry. Removal of chromium from water solutions was analysed using inductively coupled atomic emission spectrometry (ICP-AES). Mass fraction of removed chromium was varied between 79 % - 91%. The obtained results showed that efficiency of chromium(VI) removal is pronounced with addition of 1,5-diphenylcarbazide.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:645045
Study programmeTitle: Graduate university studies in chemistry; specializations in: Research programme
Course: Research programme
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Embargo expiration date: 2021-09-24
Terms of useLicence In copyright icon
Created on2019-09-27 08:16:09