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Hydrogel-incorporated adsorbents are promising organic dye adsorbents due to their three-dimensional design, cost-effectiveness, ease of use, and modular functional groups. To this end, new polyacrylamide modified biochar and acrylic acid was synthesized using Melamine functionalized biochar and acrylic acid, employing in-situ radical polymerizations. The prepared hydrogel's chemical structure was determined by Fourier transform infrared spectroscopy. In the removal of methylene blue, crystal violet, and safranin O from synthetic textile wastewater, determining the effectiveness and adsorption capacity of the synthesized hydrogel were determined by examining the influence of key parameters such as pH, initial dye concentration, contact time, and dosage. The kinetic study of the adsorption process was carried out by using pseudo-first-order and pseudo-second-order models. The experimental results are in accordance with the Langmuir isotherm and the pseudo-second-order model, which shows that the chemical and monolayer adsorption process is the preferred process.
Source link: https://doi.org/10.1007/s10924-022-02744-3
A new type of nano-polymer composite membrane was synthesized by a simple and fast casting process, incorporating the advantages of poly vinyl alcohol and chitosan's use with u03b1-MnO_2 nanoparticles. The membrane was designed for the removal of organic textile dyes from their aqueous solutions in this case. Template dyes were selected for two cationic dyes, methylene blue and eosin yellow, in order to be separated from industrial waste water. The kinetics analysis revealed that the reaction procedure occurred pseudo-first-order kinetics. The maximum effectiveness of catalyst was recorded at pH 12, as more than 85% of dyes degraded within a one-hour time span. Organic dye removal from waste water is a promising material for such functional membranes with higher stability, low production cost, increased sensitivity to degrade dyes, and excellent recycling.
Source link: https://doi.org/10.1007/s11356-022-24634-w
Certain modifications to modified C. inophyllum seed husk revealed that such modifications improved the adsorption property of this adsorbent. After 100 min of the adsorbent and adsorbate reaction, Optimum dye removal was achieved at pH 3 for AY and pH 5 for MG. The dye removal was best represented by the Freundlich isotherm scheme, resulting in a heterogeneous surface of the modified C. inophyllum seed husk and showing that surface adsorption is not the rate determining step. The adsorption reactions, which are endothermic in nature, entropy-driven, and nonspontaneous, according to AY and MG's o values of 4139. 39 J/mol for AY and MG respectively, with a H o value of 4139. 04 J/mol for AY and 28. 04 J/mol for AY and MG, respectively, are nonspontaneous in nature, entropy o mol for adsorption reactions are o osy's, o entropy-driven, otaneous in o and nonspontaneous.
Source link: https://doi.org/10.1007/s13738-022-02721-6
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