Abstract
In this study, nanocomposite hydrogels of poly(methacrylic acid-co-acrylamide) (Poly(MAA-co-AAm)) containing different weight percent bentonite clay nanoparticles (0, 5, 10, and 15 wt. %) were used to remove methyl violet (MV) dye. FTIR, SEM, TGA, and XRD were used to analyze the properties of adsorbents. Results showed that bentonite nanoparticles were successfully distributed in the hydrogel system. Bentonite nanoparticles at 10 wt. % gave the maximum MV dye adsorption efficiency. The highest adsorption was obtained at a pH of 5, an adsorbent dosage of 1.5 g/L, a temperature of 25 °C, a contact time of 60 min, and a pollutant concentration of 10 mg/L. In thermodynamics studies, a negative values of Gibbs free energy (ΔG°) indicating that the adsorption process was spontaneous. In addition, Poly(MAA-co-AAm) hydrogels and Poly(MAA-co-AAm)/bentonite nanocomposite hydrogels gave the adsorption enthalpy (ΔH°) of –61.24 and –36.14 kJ/mol witch shows that the adsorption process is exothermic in the temperature range 25–45 °C using both adsorbents. Langmuir isotherm model was successfully applied in describing the equilibrium behavior of the adsorption process. The kinetic study showed that the pseudo-second-order model was more successful in describing the kinetic behavior of the adsorption process than pseudo-first-order and Elovich models. Poly(methacrylic acid-co-acrylamide) and poly(methacrylic acid-co-acrylamide)/bentonite adsorbents gave the α parameter values of 0.4276 and 22.15 mg.(g.min)−1, respectively indicating the high adsorption capacity of these adsorbents.
Highlights
Water pollution from the improper discharge of industrial dyes originated from various industries such as textile, leather, paper, plastic, tanning, etc. is a very serious environmental concern, which threaten the living organisms and ecosystem [1,2]
Compared to the shape of the copolymer hydrogel, the vibration distance is reduced, which means that the methyl violet (MV)
Dyes and pigments are the main pollutants in wastewater streams of various industries
Summary
Water pollution from the improper discharge of industrial dyes originated from various industries such as textile, leather, paper, plastic, tanning, etc. is a very serious environmental concern, which threaten the living organisms and ecosystem [1,2]. Is a very serious environmental concern, which threaten the living organisms and ecosystem [1,2] It is, necessary to remove these toxic pollutants from industrial effluents before discharging to the environment. In the structure of monomers, there is an acidic group -COOH, which plays an important role in the adsorption and swelling properties of hydrogels. These monomers are present in the hydrogel structure in the form of copolymer bonds and frequently alter molecular chain experiences, hydrophobicity, response to stimuli, therapeutic behaviors, and the allowable amount of hydrogel [16]. Hydrogen bonds between polymer chains, water molecules and dyes are formed due to the presence of the - OH group. Clay is a low-cost, biocompatible and abundant material with good mechanical and chemical properties, which can be used in the concept of wastewater treatment [20,21]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
