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Quantum and experimental investigation of the application of Crassostrea gasar (mangrove oyster) shell–based CaO nanoparticles as adsorbent and photocatalyst for the removal of procaine penicillin from aqueous solution

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Abstract

The present study was designed to synthesize and characterize calcium oxide nanoparticles (using mangrove oyster shell as a precursor) and apply the synthesized nanoparticles as a photocatalyst to degrade procaine penicillin in an aqueous solution. The photocatalyst exhibited an average band gap of 4.42 eV, showed a maximum wavelength of absorbance in the UV region (i.e., 280 nm), and is a microporous nanoparticle with a particle diameter of 50 nm. The photocatalyzed degradation of the drug was conducted under natural sunlight, and the influence of parameters such as the period of contact, catalyst load, pH, initial drug concentration, and ionic strength was investigated concerning the degradation profile. The results obtained from response surface analysis indicated that an optimum degradation efficiency of about 93% can be obtained at a concentration, pH, and catalyst dosage of 0.125 M, 2, and 0.20 g respectively, at 0.902 desirabilities. The Langmuir–Hinshelwood, modified Freundlich, parabolic diffusion, pseudo-first-/second-order, and zero-, first-, and second-order kinetic parameters were tested to ascertain the best model that best described the experimental data. Consequently, the Langmuir–Hinshelwood, modified Freundlich, and pseudo-second-order models were accepted based on the minimum error and higher R2 values. Based on the Langmuir–Hinshelwood rate constants for adsorption and photodegradation as well as the evaluated valence bond potential, the degradation of the drug first proceeded through the mechanism of adsorption and followed by the oxidation of the drug by superoxide (generated from the interaction of electrons that generated by through the absorption of UV radiation). The quantum chemical calculation gave evidence that pointed towards the establishment of strong agreement with experimental data and also showed that the carboxyl functional group in the drug is the target site for adsorption and subsequent degradation.

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Data availability

The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

The research work that generated this publication was sponsored by the Tertiary Education Trust Fund of Nigeria (TETFUND) through the National Research grant (2020) with Prof. Nnabuk Okon Eddy as the principal investigator (grant number: TRTF/ES/DR&D-CE/NRF2020/SETI/98/VOL.1).

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Contributions

All authors contributed to the study conception, design, literature review, data collection, and writing the draft. All authors read, edited, and approved the final manuscript.

NnabukOkon Eddy: supervision, conceptualization, resources, data curation, analysis, and writing original draft.

Anduang O. Odiongenyi: conceptualization, methodology, formal analysis, writing, review, and editing.

Rajni Garg: conceptualization, methodology, validation, investigation, writing, review, and editing.

Richard Alexis Ukpe: conceptualization, methodology, validation, resources, writing, review, and editing.

Rishav Garg: conceptualization, visualization, investigation, formal analysis, writing, review, and editing.

Ahmed El Nemr: conceptualization, visualization, methodology, formal analysis, writing, review, and editing.

Comfort Michael Ngwu: conceptualization, visualization, formal analysis, writing, review, and editing.

Imeh Jospeh Okop: conceptualization, methodology, visualization, formal analysis, writing, review, and editing.

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Correspondence to Nnabuk Okon Eddy.

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Appendix

Appendix

Fig. 14
figure 14

XRD spectrum based on JCPDS No 00–004-0777 for CaO

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Eddy, N.O., Odiongenyi, A.O., Garg, R. et al. Quantum and experimental investigation of the application of Crassostrea gasar (mangrove oyster) shell–based CaO nanoparticles as adsorbent and photocatalyst for the removal of procaine penicillin from aqueous solution. Environ Sci Pollut Res 30, 64036–64057 (2023). https://doi.org/10.1007/s11356-023-26868-8

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