Mechanism of Cu²⁺and reactive yellow 145 dye adsorption onto eggshell waste as low-cost adsorbent

ABSTRACT

This work presents low-cost sorbent powder obtained from agro-waste of poultry eggshells for the adsorption of contaminants and was elucidated with transmission electron microscopy, Fourier transform infrared, scanning electron microscope, X-ray diffraction and N₂ adsorption–desorption techniques. It was observed that a solution pH of 2.0 and 5.0 was enough for the maximum uptake of reactive yellow 145 dye (RY 145) and Cu(II) ions, respectively, which showed that the pollutants removal was affected by the pH of solution. Langmuir monolayer adsorption capacity was found to be 101.500 mg/g for Cu(II) and 88.450 mg/g for reactive yellow 145 dye, respectively. Redlich–Peterson and Sips models both fitted well with the adsorption data. The Pseudo-second-order equation demonstrated good relationship with the experimental data and thus explained the adsorption mechanism to be chemisorption. Values of different thermodynamic considerations gave the values of ΔH° and ΔS° to be 30452.020, 27194.180 and 100.930, 90.370 kJmol⁻¹ for Cu(II) and RY 145 dye, respectively. Findings from this current study revealed that the prepared sorbent from agro-waste of eggshell can be a useful material for the elimination of Cu(II) and RY 145 dye in aqueous solutions.

KEYWORDS:

• Adsorption
• equilibrium
• kinetics
• mechanism
• reactive yellow 145

Acknowledgements

The authors are grateful for the financial supports received by Ofudje A. Edwin from the Department of Science and Technology (DST), Government of India. The authors also express their profound gratitude to the Technical staff of Central Instrumentation Facility, CSIR-CECRI, Tamil Nadu, India, for their support in FT-IR, TEM, SEM, and XRD analyses.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by Ofudje A. Edwin from the Department of Science and Technology (DST), Government of India.

Notes on contributors

Edwin A. Ofudje

Dr. Edwin A. Ofudje is a Senior Lecturer at the Department of Chemical Sciences, College of Basic and Applied Sciences, Mountain Top University, Ogun State, Nigeria. He is the Ag. Director of the Centre for Research, Innovation and Collaborations, Mountain Top University, Nigeria and his area of specialization includes Physical/Environmental/Material Chemistry.

Ezekiel F. Sodiya

Dr. Ezekiel F. Sodiya is a Lecturer at the Department of Chemical Sciences, College of Basic and Applied Sciences, Mountain Top University, Ogun State, Nigeria. He is interested in corrosion and environmental pollution research.

Francis H. Ibadin

Dr. Francis H. Ibadin is a Lecturer at the Department of Biological Sciences, College of Basic and Applied Sciences, Mountain Top University, Ogun State, Nigeria. His research focus is on environmental biology and toxicology.

Abimbola A. Ogundiran

Mrs. Abimbola A. Ogundiran is a Lecturer at the Department of Chemical Sciences, Tai Solarin University of Education, Ijebu-Ode, Ogun State. She is a Ph.D student at the Department of Chemistry, Olabisi Onanbajo University, Nigeria. She is focused on Physical Chemistry and pollution research.

Samson O. Alayande

Dr. Samson O. Alayande is currently working as a Senior Lecturer, Department of Physical Science, First Technical University (Tech-U), Ibadan, Nigeria. He is the Ag. Director, Intellectual Property and Technology Transfer Office, First Technical University (Tech-U), Ibadan, Nigeria. He has excellent research contributions in the Industrial Chemistry, Environmental and Material Science.

Oluremi A. Osideko

Dr. (Mrs) Oluremi A. Osideko was awarded a Ph.D in Physical Chemistry from Federal University of Agriculture Abeokuta, Ogun State Nigeria. Dr. Osideko is interested in the research area of Physical and Environmental Chemistry.