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Adsorption of azo dyes by a novel bio-nanocomposite based on whey protein nanofibrils and nano-clay: Equilibrium isotherm and kinetic modeling

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  • Shabboo Rahimi Aqdam, National Institute for Genetic Engineering and Biotechnology Iran
  • ,
  • Daniel E. Otzen
  • Niyaz Mohammad Mahmoodi, Ministry of Science, Research and Technology Islamic Republic of Iran
  • ,
  • Dina Morshedi, National Institute for Genetic Engineering and Biotechnology Iran

Excessive discharge of synthetic azo dyes into the aquatic ecosystem is a global concern. Here, we develop a green approach to remediate dye pollutants by fabricating an easily separable bio-nanocomposite, based on nanofibrils from whey protein concentrate together with montmorillonite. The nanocomposite was characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and surface area analysis. Nanofibrils lead to a uniform dispersion of montmorillonite in the matrix and also reinforce the nanocomposite. The adsorption efficacy was monitored using cationic (Chrysoidine-G, Bismarck brown-R), reactive (reactive black-5, reactive orange-16), acidic (acid red-88, acid red-114) and direct (direct violet-51, Congo red) dyes. The nanocomposite adsorbed different dyes with different kinetics, cationic dyes quicker and reactive dyes slower. Greater than 93% of Chrysoidine-G was adsorbed over a wide range of dye concentration and pH. Acidic pH and higher temperature are more favorable for the process. Equilibrium adsorption data were reasonably fitted with a linear (Nernst) isotherm model indicating the existence of an unlimited number of adsorption sites which is consistent with the high experimental uptake of 731 mg/g. Kinetic data were well-described by pseudo-second-order and intra-particle diffusion models. We conclude that this environmentally friendly nanocomposite has good potential for use in wastewater treatment and related purposes.

TidsskriftJournal of Colloid and Interface Science
Sider (fra-til)490-503
StatusUdgivet - nov. 2021

Bibliografisk note

Funding Information:
This work was supported by the Bioprocess Engineering Department, Institute of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology; and Center for International Scientific Studies & Collaboration (CISSC), Ministry of Science Research and Technology. D.E.O. is grateful for support from the Independent Research Foundation Denmark | Natural Sciences (grant no. 8021-00208B ). The authors would like to thank Farhang Aliakbari for helpful discussions and Zahra Najarzadeh for help with TEM images. Tayebe Bagheri Lotfabad is acknowledged for helpful suggestions in the film preparation process.

Publisher Copyright:
© 2021 Elsevier Inc.

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