Elimination performance of Nile blue from wastewater using by carboxymethyl cellulose-graft-poly(methacrylic acid-co-acrylamide)/kaolin nanocomposite hydrogel

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES International Journal of Environmental Science and Technology Pub Date : 2023-07-12 DOI:10.1007/s13762-023-05096-0

E. Jafarian, A. Hekmatiyan, A. Cheraghdar, H. Safarzadeh, M. Shamsi

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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.

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羧甲基纤维素-接枝-聚(甲基丙烯酸-共丙烯酰胺)/高岭土纳米复合水凝胶对废水中尼罗蓝的去除性能

在本研究中，我们合成了羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)共聚物水凝胶和羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)/高岭土纳米复合材料，该复合材料具有自由基机制，可吸附尼罗河蓝染料中的污染物。在pH = 11、温度为25℃、接触时间为90 min、污染物浓度为10 ppm、吸附剂剂量为1.5 mg的条件下，纳米复合水凝胶的吸附性能最佳。高岭土型粘土纳米颗粒对NB染料污染物的吸附率从96.49%提高到98.91%，表明纳米颗粒成功加入到水凝胶共聚物结构中。等温线性能最佳的是Langmuir模型，羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)共聚物水凝胶和羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)纳米复合水凝胶的最大吸附容量分别为138.49和149.82。在动力学模型分析中，Elovich的动力学模型表现最好，其中羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)共聚物水凝胶的α值为0.783，羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)/高岭石纳米复合水凝胶的α值为9.58，具有较高的吸附值。羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)和羧甲基纤维素-接枝聚(甲基丙烯酸-共丙烯酰胺)/高岭土纳米复合水凝胶的吸附焓值(ΔH°)分别为- 61.512 kJ/mol和- 77.281 kJ/mol。ΔH°的负值表明，使用两种吸附剂时，该过程在5-50°C时是放热的。在实验温度范围内，吸附过程的吉布斯自由能(ΔG°)为负，说明吸附过程可能是自发的。

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来源期刊

International Journal of Environmental Science and Technology 环境科学-环境科学

CiteScore

5.60

自引率

6.50%

发文量

806

审稿时长

10.8 months

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.