Detail publikačního výsledku

How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – 2. Non-stationary diffusion experiments

SEDLÁČEK, P.; SMILEK, J.; KLUČÁKOVÁ, M.

Originální název

How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – 2. Non-stationary diffusion experiments

Anglický název

How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – 2. Non-stationary diffusion experiments

Druh

Článek WoS

Originální abstrakt

Non-stationary diffusion of two cationic dyes (Methylene Blue and Rhodamine 6G) was studied in hydrogels with different content of agarose and humic acids (HA). A simple spectrophotometrical method was utilized in the in situ measurement of dye concentration in the gel samples at different distances from the boundary. The effect of temperature, pH and ionic strength was investigated. The results confirmed the considerable partitioning of both dyes in agarose gels as well as the strong immobilization of dyes caused by their sorption on HA. The apparent diffusion coefficients of both dyes decreased with increasing solid content in gels. In the case of agarose gels without the addition of HA, this decrease was attributed to increased tortuosity of diffusion caused by denser agarose network. The apparent equilibrium constant of the sorption of dyes on HA in agarose/HA gels was calculated from their apparent diffusion coefficients. The value of the equilibrium constant increased with the content of HA in gel and, surprisingly, also with decreasing pH inside gel.

Anglický abstrakt

Non-stationary diffusion of two cationic dyes (Methylene Blue and Rhodamine 6G) was studied in hydrogels with different content of agarose and humic acids (HA). A simple spectrophotometrical method was utilized in the in situ measurement of dye concentration in the gel samples at different distances from the boundary. The effect of temperature, pH and ionic strength was investigated. The results confirmed the considerable partitioning of both dyes in agarose gels as well as the strong immobilization of dyes caused by their sorption on HA. The apparent diffusion coefficients of both dyes decreased with increasing solid content in gels. In the case of agarose gels without the addition of HA, this decrease was attributed to increased tortuosity of diffusion caused by denser agarose network. The apparent equilibrium constant of the sorption of dyes on HA in agarose/HA gels was calculated from their apparent diffusion coefficients. The value of the equilibrium constant increased with the content of HA in gel and, surprisingly, also with decreasing pH inside gel.

Klíčová slova

Reactivity; Diffusion; Humic Acids; Hydrogels

Klíčová slova v angličtině

Reactivity; Diffusion; Humic Acids; Hydrogels

Autoři

SEDLÁČEK, P.; SMILEK, J.; KLUČÁKOVÁ, M.

Rok RIV

2015

Vydáno

12.02.2014

Nakladatel

REACTIVE & FUNCTIONAL POLYMERS,

Místo

NETHERLANDS

ISSN

1381-5148

Periodikum

REACTIVE & FUNCTIONAL POLYMERS

Svazek

75

Číslo

1

Stát

Nizozemsko

Strany od

41

Strany do

50

Strany počet

10

Plný text v Digitální knihovně

http://hdl.handle.net/

BibTex

@article{BUT104112,
  author="Petr {Sedláček} and Jiří {Smilek} and Martina {Klučáková}",
  title="How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – 2. Non-stationary diffusion experiments",
  journal="REACTIVE & FUNCTIONAL POLYMERS",
  year="2014",
  volume="75",
  number="1",
  pages="41--50",
  doi="10.1016/j.reactfunctpolym.2013.12.002",
  issn="1381-5148"
}