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Acryloyl tetrasodium thiacalix[4]arene tetrasulfonate (ACSTCA) was synthesized via fictionalization of tetrasodium thiacalix[4]arene tetrasulfonate (STCA). Hydrogels based on acrylic acid (AA) (20-70 mol%) and ACSTCA (30-80 mol%) were prepared by solution copolymerization in water using methylene bisacrylamide and ammonium persulfate as crosslinker and initiator, respectively. The gels obtained exhibited a good ability for absorbing water. Swelling of the gels was improved with increase in ACSTCA content in the gel feed. Characterization of the synthesized monomer (ACSTCA) was performed using mass spectrometry and Fourier transform infrared (FTIR), 1 H and 13 C NMR spectroscopies and the synthesized gels were characterized by FTIR. The thermal and mechanical properties of these copolymers were also studied using TGA and dynamic mechanical thermal analysis. The glass transition temperature and storage modulus of the copolymer were increased with increasing content of ACSTCA in the gel. Thermal stability was improved with increasing ACSTCA content in the structure of the copolymer. The results showed that the synthesized copolymer (ACSTCA-AA) can effectively remove dye from wastewater. The dye removal capacity of the gels was investigated with a UV−visible spectrophotometer. In addition, the effect of key operation parameters such as the ACSTCA content in the structure of the copolymer, contact time, adsorbent dosage, pH of the solution and temperature on dye removal from aqueous solution was experimentally studied. The equilibrium data were analyzed using the Langmuir and Freundlich adsorption isotherms. The Freundlich isotherms provided a better fit to the data. Results from the kinetic studies revealed that the adsorption of malachite green onto the hydrogels followed a pseudo-second-order kinetic model.

Allyl tetrasodium thiacalix[4]arene tetrasulfonate (ASTCA) was synthesized via functionalization of tetrasodium thiacalix[4]arene tetrasulfonate (STCA). Alcohol-specific superabsorbing gels (superalcogels) based on acrylic acid (AA, 60-90 mol%) and allyl tetrasodium thiacalix[4]arene tetrasulfonate (ASTCA, 10-30 mol%) were prepared by solution copolymerization in water. Methylene bisacrylamide and ammonium persulfate were used as crosslinker and initiator, respectively. Then, the synthesized copolymers were treated with HCl to produce allyl thiacalix[4]arene tetrasulfonic acid(ASTCAH) based alcogels. The obtained gels exhibited high ability for absorbing and retaining a variety of monohydric and polyhydric alcohols. Alcohol absorbency was improved with increase of ASTCA content in feeding of the gel. Characterization of sulfonated monomer (ASTCA) was performed using FTIR, 1 H and 13 C-NMR spectroscopies and the synthesized gels characterized by FTIR. Thermal and mechanical properties of these copolymers were also studied using TGA and DMTA. Glass transition temperature and storage modulus of the copolymer were increased with an increase of the ASTCA in the gel. Thermal stability was improved with an increase of ASTCA content in the copolymer.

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