Impact of temperature and humic acid-assisted synthesis on selenium sorption onto iron oxide nanoparticles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00385242" target="_blank" >RIV/68407700:21340/25:00385242 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jwpe.2025.108119" target="_blank" >https://doi.org/10.1016/j.jwpe.2025.108119</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jwpe.2025.108119" target="_blank" >10.1016/j.jwpe.2025.108119</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Impact of temperature and humic acid-assisted synthesis on selenium sorption onto iron oxide nanoparticles

Popis výsledku v původním jazyce

Selenium is a key element for biological systems, but at elevated concentrations it can pose a risk to both the environment and human health. Therefore, developing effective strategies to limit its mobility is crucial. Here, we investigated the immobilization of selenite and selenate using iron-based magnetic adsorbents synthesized at various temperatures in the presence of humic acids (HA). Mo<spacing diaeresis>ssbauer spectrometry confirmed the presence of both (minor) magnetite and (major) maghemite components in the adsorbents. HA decreased the overall surface charge and size of the nanoparticles. Kinetic analysis revealed rapid and efficient removal of both species by the synthesized adsorbents at pH 3. The process was best described by pseudo-nth order kinetic model for selenite, whereas the kinetic data for selenate were inconclusive. This suggests a complex interaction between selenite and the adsorbent surfaces that cannot be adequately described by first- or second-order reaction kinetics since the sorption likely involved reductive immobilization, as evidenced by the presence of elemental selenium on the adsorbent surfaces, as revealed by X-ray photoelectron spectroscopy. Selenite sorption showed maximum capacity for adsorbents synthesized at 60 degrees C, without HA at 539.5 mu mol center dot g- 1 and with HA at 528.4 mu mol center dot g- 1. The highest maximum sorption capacity of selenate was observed for materials synthesized without HA at 30 degrees C at 340.9 mu mol center dot g- 1. Desorption experiments demonstrated high regeneration efficiency for sorbents synthesized at lower temperatures, with desorption rates reaching up to 92 %. However, the presence of HA significantly reduced desorption efficiency, though this effect diminished as the synthesis temperature increased.

Název v anglickém jazyce

Impact of temperature and humic acid-assisted synthesis on selenium sorption onto iron oxide nanoparticles

Popis výsledku anglicky

Selenium is a key element for biological systems, but at elevated concentrations it can pose a risk to both the environment and human health. Therefore, developing effective strategies to limit its mobility is crucial. Here, we investigated the immobilization of selenite and selenate using iron-based magnetic adsorbents synthesized at various temperatures in the presence of humic acids (HA). Mo<spacing diaeresis>ssbauer spectrometry confirmed the presence of both (minor) magnetite and (major) maghemite components in the adsorbents. HA decreased the overall surface charge and size of the nanoparticles. Kinetic analysis revealed rapid and efficient removal of both species by the synthesized adsorbents at pH 3. The process was best described by pseudo-nth order kinetic model for selenite, whereas the kinetic data for selenate were inconclusive. This suggests a complex interaction between selenite and the adsorbent surfaces that cannot be adequately described by first- or second-order reaction kinetics since the sorption likely involved reductive immobilization, as evidenced by the presence of elemental selenium on the adsorbent surfaces, as revealed by X-ray photoelectron spectroscopy. Selenite sorption showed maximum capacity for adsorbents synthesized at 60 degrees C, without HA at 539.5 mu mol center dot g- 1 and with HA at 528.4 mu mol center dot g- 1. The highest maximum sorption capacity of selenate was observed for materials synthesized without HA at 30 degrees C at 340.9 mu mol center dot g- 1. Desorption experiments demonstrated high regeneration efficiency for sorbents synthesized at lower temperatures, with desorption rates reaching up to 92 %. However, the presence of HA significantly reduced desorption efficiency, though this effect diminished as the synthesis temperature increased.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/LM2023073" target="_blank" >LM2023073: Jaderné experimentální centrum VR-1</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Water Process Engineering

ISSN

2214-7144

e-ISSN

—

Svazek periodika

76

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

IE - Irsko

Počet stran výsledku

18

Strana od-do

—

Kód UT WoS článku

001517051100001

EID výsledku v databázi Scopus

2-s2.0-105008103804