Open AccessFormation of iron sulfide photocatalytic colloidal dispersion via pulsed laser ablation in liquids
Author(s) -
Lukáš Vála,
Veronika Vavruňková,
Věra Jandová,
Michal Pola,
Tomáš Křenek
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/613/1/012034
Subject(s) - colloid , raman spectroscopy , materials science , chemical engineering , laser ablation , nanoparticle , dispersion (optics) , analytical chemistry (journal) , photocatalysis , chemistry , laser , nanotechnology , chromatography , optics , physics , engineering , biochemistry , catalysis
Pulsed laser irradiation of iron sulfide in water and ethanol allows laser ablation and generation of FeS nano/micro particles. Measurement of the size distribution reveals 100, 1000 and 5000 nm sized particles in water and 180 nm sized particles in ethanol. The values of zeta potential: 13.2 mV for colloid in water confirm incipient stability and tendency for coagulation whereas the value: -40.6 mV shows good stability of ablatively achieved nanoparticles in ethanol. SEM analyses of particles obtained by evaporation of solvents on Ta substrate revealed shapeless, roundshape and sheet-like morphology of agglomerates whose size span from units up to tens of µm. Also spherical particles sized around tens of nm were detected. EDX shows Fe/S ratio ∼3.25 and ∼ 1.2 for particles ablated in water and ethanol respectively. Raman spectroscopy indicates the formation of mackinawite (Fe 1+x S) and pyrrhotite (Fe 1-x S) phase. The photocatalytic effect of prepared water colloid was tested in methylene blue (MB) degradation under the daylight.