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Microwave-Assisted Synthesis of Carbon Nanotubes for the Removal of Toxic Cationic Dyes From Textile Wastewater Publisher



Qureshi SS1 ; Shah V2 ; Nizamuddin S3 ; Mubarak NM4 ; Karri RR4 ; Dehghani MH5, 6 ; Ramesh S7, 8 ; Khalid M9 ; Rahman ME10
Authors
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Authors Affiliations
  1. 1. Institute of Environmental Engineering and Management, Mehran University of Engineering and Technology, Sindh, Jamshoro, 76090, Pakistan
  2. 2. Department of Chemical and Petroleum Engineering, Faculty of Engineering, UCSI University, Kuala Lumpur, 56000, Malaysia
  3. 3. School of Engineering, RMIT University, Melbourne, 3000, Australia
  4. 4. Petroluem and Chemical Engineering, Faculty of Engineering, University of Technology Brunei, Bandar Seri Begawan, BE1410, Brunei Darussalam
  5. 5. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  6. 6. Institute for Environmental Research, Center for Solid Waste Research, Tehran University of Medical Sciences, Tehran, Iran
  7. 7. Center of Advanced Manufacturing and Material Processing, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia
  8. 8. Mechanical Engineering Programme Area, Faculty of Engineering, Universiti Teknologi Brunei, Tungku Highway, BE1410, Brunei Darussalam
  9. 9. Graphene & Advanced 2D Materials Research Group (GAMRG), School of Engineering and Technology, Sunway University, No. 5, Jalan University, Bandar Sunway, Selangor, Subang Jaya, 47500, Malaysia
  10. 10. Department of Mechanical & Construction Engineering at Northumbria University, Newcastle upon Tyne, United Kingdom

Source: Journal of Molecular Liquids Published:2022


Abstract

Toxic cationic dyes are used in different textile industries. When the colour interacts with the sunlight, it causes incomplete photosynthesis, inhibiting aquatic organisms’ growth and disrupting gas permeability in the water system. In this work, carbon nanotubes (CNTs) were prepared to employ acetylene and hydrogen as precursor gases in a microwave-assisted reactor. The obtained CNTs were tested for their ability to remove the crystal violet (CV) dye. However, the effect of removal parameters, such as pH of ion solution, initial concentration, and contact time, was optimized on the adsorption process through response surface methodology. It was found that the optimized removal of CV dye was 81% at an optimum pH value of 7.0 with 10 mg/L of an initial concentration and a contact time of 25 min. Complete dye extraction can be achieved by increasing the CNT dosage.Moreover, by using both the Langmuir model and Freundlich model of adsorption, the equilibrium data obtained from experiments were analyzed. The study also revealed that the adsorption at room temperature, having a high adsorption capability of 2.615 mg/g for CV, was best defined using the Langmuir model. For the reaction order, the adsorption rates represented the pseudo-first-order kinetic model. © 2022 Elsevier B.V.
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