Elimination performance of Nile blue from wastewater using by carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide)/kaolin nanocomposite hydrogel
E. Jafarian, A. Hekmatiyan, A. Cheraghdar, H. Safarzadeh, M. Shamsi
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引用次数: 0
Abstract
In this study, we synthesized carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide) copolymer hydrogels and carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide)/kaolin nanocomposite with a free radical mechanism to adsorb pollutants of Nile blue dye. Nanocomposite hydrogels performed best at pH = 11, a temperature of 25 °C, a contact time of 90 min, a concentration of pollutant 10 ppm, and an adsorbent dose of 1.5 mg. The increased adsorption rate of NB dye pollutants after adding kaolin-type clay nanoparticles from 96.49 to 98.91% showed the successful addition of nanoparticles to hydrogel copolymer structures. The best isotherm performance was the Langmuir isotherm model, and maximum adsorption capacity for carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide) copolymer hydrogels and for carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide) nanocomposite hydrogel was 138.49 and 149.82, respectively. In the analysis of kinetic models, Elovich's kinetic model had the best performance, where the α value for carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide) copolymer hydrogels are 0.783 and for carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide)/kaolin nanocomposite hydrogel obtained a value of 9.58, which indicates a high adsorption value. On the other hand, the enthalpy parameters (ΔH°) for adsorption process using carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide) and carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide)/kaolin nanocomposite hydrogels were − 61.512 kJ/mol and − 77.281 kJ/mol, respectively. The negativity of ΔH° indicates that the process is exothermic at 5–50 °C using both adsorbers. Furthermore, this process could be spontaneous because the Gibbs free energy (ΔG°) for adsorption processes was negative in experiment temperature range.
期刊介绍：
International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management.
A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made.
The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.
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