Diffuse reflectance spectra of methylene blue adsorbed on different types of clay samples
Abstract
Diffuse reflectance (DR) spectra in the visible (VIS) and near-infrared (NIR) region of methylene blue (MB) adsorbed on clay samples of different mineral composition and varying MB/clay ratios were analyzed. This type of investigation is not affected by unadsorbed MB molecules and can be used in clay-mineral determination. When the MB dye/clay loading was increased, enhancement of bands in the DR-VIS and DR-NIR was observed. The distribution of various MB aggregates was interpreted according to mineral composition and MB loading. The NIR spectrum of H2O overtone provides insights about the intercalated MB aggregation, consistent with VIS spectra. Critical MB concentration for formation of dimeric structure was between 0.7 and 1.75 mmol/100 g followed with suppression of monomers. Different orientations of vectors of polarized light allowed calculations of the possible orientation and tilting angle of MB molecules on the surface of the clay particles in accordance with XRD data.
Keywords:
diffuse reflectance spectroscopy / methylene blue / adsorption / cation exchange / clay mineralsSource:
Clay Minerals, 2016, 51, 1, 81-96Publisher:
- Mineralogical Soc, Twickenham
Funding / projects:
- Minerals of Serbia: composition, genesis, application and contribution to the environmental sustainability (RS-MESTD-Basic Research (BR or ON)-176010)
DOI: 10.1180/claymin.2016.051.1.07
ISSN: 0009-8558
WoS: 000384902500007
Scopus: 2-s2.0-84983403595
Collections
Institution/Community
IHTMTY - JOUR AU - Milošević, Maja AU - Logar, M AU - Dojčinović, Biljana AU - Rosic, A AU - Erić, Slavica PY - 2016 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1942 AB - Diffuse reflectance (DR) spectra in the visible (VIS) and near-infrared (NIR) region of methylene blue (MB) adsorbed on clay samples of different mineral composition and varying MB/clay ratios were analyzed. This type of investigation is not affected by unadsorbed MB molecules and can be used in clay-mineral determination. When the MB dye/clay loading was increased, enhancement of bands in the DR-VIS and DR-NIR was observed. The distribution of various MB aggregates was interpreted according to mineral composition and MB loading. The NIR spectrum of H2O overtone provides insights about the intercalated MB aggregation, consistent with VIS spectra. Critical MB concentration for formation of dimeric structure was between 0.7 and 1.75 mmol/100 g followed with suppression of monomers. Different orientations of vectors of polarized light allowed calculations of the possible orientation and tilting angle of MB molecules on the surface of the clay particles in accordance with XRD data. PB - Mineralogical Soc, Twickenham T2 - Clay Minerals T1 - Diffuse reflectance spectra of methylene blue adsorbed on different types of clay samples VL - 51 IS - 1 SP - 81 EP - 96 DO - 10.1180/claymin.2016.051.1.07 ER -
@article{ author = "Milošević, Maja and Logar, M and Dojčinović, Biljana and Rosic, A and Erić, Slavica", year = "2016", abstract = "Diffuse reflectance (DR) spectra in the visible (VIS) and near-infrared (NIR) region of methylene blue (MB) adsorbed on clay samples of different mineral composition and varying MB/clay ratios were analyzed. This type of investigation is not affected by unadsorbed MB molecules and can be used in clay-mineral determination. When the MB dye/clay loading was increased, enhancement of bands in the DR-VIS and DR-NIR was observed. The distribution of various MB aggregates was interpreted according to mineral composition and MB loading. The NIR spectrum of H2O overtone provides insights about the intercalated MB aggregation, consistent with VIS spectra. Critical MB concentration for formation of dimeric structure was between 0.7 and 1.75 mmol/100 g followed with suppression of monomers. Different orientations of vectors of polarized light allowed calculations of the possible orientation and tilting angle of MB molecules on the surface of the clay particles in accordance with XRD data.", publisher = "Mineralogical Soc, Twickenham", journal = "Clay Minerals", title = "Diffuse reflectance spectra of methylene blue adsorbed on different types of clay samples", volume = "51", number = "1", pages = "81-96", doi = "10.1180/claymin.2016.051.1.07" }
Milošević, M., Logar, M., Dojčinović, B., Rosic, A.,& Erić, S.. (2016). Diffuse reflectance spectra of methylene blue adsorbed on different types of clay samples. in Clay Minerals Mineralogical Soc, Twickenham., 51(1), 81-96. https://doi.org/10.1180/claymin.2016.051.1.07
Milošević M, Logar M, Dojčinović B, Rosic A, Erić S. Diffuse reflectance spectra of methylene blue adsorbed on different types of clay samples. in Clay Minerals. 2016;51(1):81-96. doi:10.1180/claymin.2016.051.1.07 .
Milošević, Maja, Logar, M, Dojčinović, Biljana, Rosic, A, Erić, Slavica, "Diffuse reflectance spectra of methylene blue adsorbed on different types of clay samples" in Clay Minerals, 51, no. 1 (2016):81-96, https://doi.org/10.1180/claymin.2016.051.1.07 . .