How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – Results from diffusion cells

Sedláček, Petr; Smilek, Jiří; Klučáková, Martina

doi:10.1016/j.reactfunctpolym.2013.07.008

Cited by 25 publications

(36 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second effect is a possible interaction between the diffusion probes and HA and humic acids during the transport of the probes through the hydrogel. In comparison with our previous works [21][22][23][24][25][26][27][28], the diffusion probes are in equilibrium with humic acids at the beginning of the release experiments. It means that the immobilization of the probe has the same rate as its liberation from binding sites.…”

Section: Resultsmentioning

confidence: 70%

“…In this work, the effect of standard humic acids as the complexation agents added in agarose hydrogels was studied by means of so-called diffusion-release experiments. Humic acids are known as substances which complex effectively with metal ions [25][26][27][28][29][30][31][32][33] and dyes [21][22][23][24]. Carboxylic functional groups, as well as aromatic structures and π−π interactions, are important in their reactivity.…”

Section: Resultsmentioning

confidence: 99%

“…The mixture was slowly heated with continuous stirring up to 80 • C and stirred at this temperature in order to obtain a transparent solution, and finally sonicated (1 min) to remove gasses. AG hydrogels were prepared using 1 wt % AG solution [21][22][23][24]. Afterwards, the AG solution was slowly poured into the polymethylmethacrylate (PMMA) spectrophotometric cuvette (inner dimensions: 10 mm × 10 mm × 45 mm).…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

“…AG-HA hydrogels were prepared from 1 wt % AG solution containing 0.01 wt % of HA. The AG and humic contents in final hydrogels were chosen on the basis of our previous results and experimental experiences [21][22][23][24]. Images of pure agarose hydrogel and hydrogel enriched by humic acids in cuvettes are shown in Figure S1 (from the Supplementary Materials).…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

“…In our previous studies [21][22][23][24], agarose hydrogels were enriched by humic acids as an active component in order to support the complexation of diffusing particles in hydrogels. Humic-agarose hydrogels were characterized by means of their viscoelastic properties [21,24], and the transport of different ions through the hydrogels was studied by means of diffusion cells [21,23,24] and non-stationary transient diffusion [22,23]. The effect of acidic functional groups of humic acids on the complexation and transport of metal and dye ions was investigated by means of the selective blocking of carboxylic groups by methylation [23,24].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Klučáková

2020

Polymers

Self Cite

View full text Add to dashboard Cite

The transport properties of agarose hydrogels enriched by humic acids were studied. Methylene blue, rhodamine 6G and Cu(II) ions were incorporated into hydrogel as diffusion probes, and then their release into water was monitored. Cu(II) ions as well as both the dyes studied in this work have high affinity to humic substances and their interactions strongly affected their diffusion in hydrogels. It was confirmed that humic acids retarded the transport of diffusion probes. Humic acids’ enrichment caused the decrease in the values of effective diffusion coefficients due to their complexation with diffusion probes. In general, the diffusion of dyes was more affected by the complexation with humic acids in comparison with Cu(II) ions. The effect of complexation was selective for the particular diffusion probe. The strongest effect was obtained for the diffusion of methylene blue. It was assumed that metal ions interacted preferentially with acidic functional groups. In contrast to Cu(II) ions, dyes can interact with acidic functional groups, and the condensed cyclic structures of the dye probes supported their interactions with the hydrophobic domains of humic substances.

show abstract

Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Klučáková

2020

Polymers

Self Cite

View full text Add to dashboard Cite

show abstract

Proton diffusion in PAM hydrogels

Chen,

Ren,

Xiang

2023

Polymer Engineering & Sci

View full text Add to dashboard Cite

Hydrogels are widely used in the field of biomedicine because of their excellent biocompatibility. In most cases, the pH range applicable to drugs is limited, so it is meaningful to study the diffusion of protons in hydrogels. In this work, the diffusion rate of protons in hydrogels was monitored by a self‐made device, and the factors affecting the diffusion rate of protons were studied. The self‐made device consists of a supply chamber and a receiving chamber with a piece of hydrogel sandwiching between them. It was found that the thickness of hydrogel had a great influence on proton diffusion. The thicker the hydrogel is, the slower the proton diffusion rate is. At the same time, the diffusion coefficient of protons in PAM hydrogel was calculated to be 1.28 ± 0.09 × 10−5 cm2/s (HCl, 25°C). The diffusion coefficient is a function of temperature, and its value increases with the increase in temperature. The effect of the solid content of hydrogel on proton diffusion was also considered, but in the range of solid content 1.81%–10.07%, the proton diffusion rate was almost unaffected. Moreover, anions also have a decisive effect on proton diffusion, with smaller anions leading to faster proton diffusion in the hydrogel.

show abstract

Transport of Organic Compounds Through Porous Systems Containing Humic Acids

Smilek

Sedláček

Laštůvková

et al. 2016

Bull Environ Contam Toxicol

View full text Add to dashboard Cite

Soil pollution by the presence of different contaminants (e.g. heavy metal ions or pesticides) is one of the biggest problems worldwide. The positive affinity of natural humic acids towards these contaminants might contribute to the soil and ground water protection; therefore it is necessary to study the reactivity and barrier properties of humic acids. An original reactivity-mapping tool based on diffusion techniques designed to study the reactivity and barrier properties of polyelectrolytes was developed and tested on humic acids. The results of diffusion experiments demonstrate that the electrostatic interactions between humic acids functioning as a polyelectrolyte interpenetrated in a supporting hydrogel matrix (agarose) and cationic dye (methylene blue) as a model solute have a crucial impact on the rate of diffusion processes and on the barrier properties of hydrogels. The intensity of interactions was evaluated by fundamental diffusion parameters (effective diffusion coefficients and breakthrough time). The impact of modification of humic acids was also studied by means of diffusion experiments conducted on two types of standard humic acids (Leonardite 1S104H) and humic acids with selectively methylated carboxylic groups.

show abstract

How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – Results from diffusion cells

Cited by 25 publications

References 60 publications

Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Proton diffusion in PAM hydrogels

Transport of Organic Compounds Through Porous Systems Containing Humic Acids

Contact Info

Product

Resources

About