One-step microwave synthesis of magnetic biochars with sorption properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F18%3A73589867" target="_blank" >RIV/61989592:15310/18:73589867 - isvavai.cz</a>

Výsledek na webu

<a href="http://koreascience.or.kr/article/JAKO201814446220726.page" target="_blank" >http://koreascience.or.kr/article/JAKO201814446220726.page</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5714/CL.2018.26.031" target="_blank" >10.5714/CL.2018.26.031</a>

Jazyk výsledku

angličtina

Název v původním jazyce

One-step microwave synthesis of magnetic biochars with sorption properties

Popis výsledku v původním jazyce

Adsorption is one of the best methods for wastewater purification. The fact that water quality is continuously decreasing requires the development of novel, effective and cost available adsorbents. Herein, a simple procedure for the preparation of a magnetic adsorbent from agricultural waste biomass and ferrofluid has been introduced. Specifically, ferrofluid mixed with wheat straw was directly pyrolyzed either by microwave irradiation (900 W, 30 min) or by conventional heating (550∘C, 90 min). Magnetic biochars were characterized by X-ray powder diffraction, Mössbauer spectroscopy, textural analysis and tested as adsorbents of As(V) oxyanion and cationic methylene blue, respectively. Results showed that microwave pyrolysis produced char with high adsorption capacity of As(V) (Qm=25.6mgg−1 at pH 4), whereas conventional pyrolysis was not so effective. In comparison to conventional pyrolysis, one-step microwave pyrolysis produced a material with expressive microporosity, having a nine times higher value of specific surface area as well as total pore volume. We assumed that sorption properties are also caused by several iron-bearing composites identified by Mössbauer spectroscopy ([super] paramagnetic Fe2O3, α−Fe, non-stoichiometric Fe3C, γ−Fe2O3, γ−Fe) transformed from nano-maghemite presented in the ferrofluid. Methylene blue was also more easily removed by magnetic biochar prepared by microwaves (Qm=144.9mgg−1 at pH 10.9) compared to using conventional techniques.

Název v anglickém jazyce

One-step microwave synthesis of magnetic biochars with sorption properties

Popis výsledku anglicky

Adsorption is one of the best methods for wastewater purification. The fact that water quality is continuously decreasing requires the development of novel, effective and cost available adsorbents. Herein, a simple procedure for the preparation of a magnetic adsorbent from agricultural waste biomass and ferrofluid has been introduced. Specifically, ferrofluid mixed with wheat straw was directly pyrolyzed either by microwave irradiation (900 W, 30 min) or by conventional heating (550∘C, 90 min). Magnetic biochars were characterized by X-ray powder diffraction, Mössbauer spectroscopy, textural analysis and tested as adsorbents of As(V) oxyanion and cationic methylene blue, respectively. Results showed that microwave pyrolysis produced char with high adsorption capacity of As(V) (Qm=25.6mgg−1 at pH 4), whereas conventional pyrolysis was not so effective. In comparison to conventional pyrolysis, one-step microwave pyrolysis produced a material with expressive microporosity, having a nine times higher value of specific surface area as well as total pore volume. We assumed that sorption properties are also caused by several iron-bearing composites identified by Mössbauer spectroscopy ([super] paramagnetic Fe2O3, α−Fe, non-stoichiometric Fe3C, γ−Fe2O3, γ−Fe) transformed from nano-maghemite presented in the ferrofluid. Methylene blue was also more easily removed by magnetic biochar prepared by microwaves (Qm=144.9mgg−1 at pH 10.9) compared to using conventional techniques.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Carbon Letters

ISSN

1976-4251

e-ISSN

—

Svazek periodika

26

Číslo periodika v rámci svazku

APR

Stát vydavatele periodika

KR - Korejská republika

Počet stran výsledku

12

Strana od-do

31-42

Kód UT WoS článku

000436268400005

EID výsledku v databázi Scopus

2-s2.0-85046452259