Abstract
We report the preparation and characterization of a series of nano-sized metal oxides namely CuO, NiO, SnO, SnO2 and Zn2SiO4 to adsorb Cr(VI) via batch method. It is the first study that utilizes Zn2SiO4 to adsorb Cr(VI). Metal oxides were characterized using XRD, FTIR and TGA. Operating parameters including pH, contact time, adsorbent dose, Cr(VI) concentration, temperature and interfering ions were studied. The optimum pH values were pH 6 in case of CuO and NiO, pH 7 in case of SnO and SnO2 and pH 4 in case of Zn2SiO4. The pseudo-second-order kinetic model was appropriate to describe the process and Langmuir model was the best fitted isotherm model implying the domination of chemisorption with adsorption capacities 15.5, 7.77, 9.65, 7.06 and 10.95 mg/g for CuO, NiO, SnO and SnO2 and Zn2SiO4, respectively. The intraparticle diffusion model showed a boundary layer control. Cr(VI) adsorption was temperature-dependent and the thermodynamic parameters showed a non-spontaneous process. The ∆H0 values indicated an endothermic adsorption on NiO and SnO and exothermic adsorption on SnO, SnO2 and Zn2SiO4. The practical application for Cr(VI) removal showed 73.2% and 99.3% removal on NiO and SnO nanoparticles (NPs) respectively from spiked polluted industrial water and 71.2% and 88.6% of Cr(VI) respectively from spiked drinking water samples. A techno-economics study was performed showing an average cost of 2.3 USD per gram of the prepared nanometal oxides.
Highlights
• We prepared and characterized CuO, NiO, SnO, SnO2 and Zn2SiO4 metal oxides.
• Adsorption experiment of Cr(VI) on CuO, NiO, SnO, SnO2 and Zn2SiO4 were performed.
• Adsorption of Cr(VI) on the prepared nano-metal oxides showed a chemisorption nature.
• An application study and metal oxide regenerations were performed.
• The average cost of the prepared nano-metal oxides was 2.3 USD per gram.
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The authors declare that all data supporting the findings of this study are available within the article and its supplementary information files.
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The authors gratefully acknowledge the partial financial support from National Institute of Oceanography and Fishers (NIOF), Egypt.
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Hany Fathy Heiba, Omayma H. Abd El-Hamed, Nabil S. Habila and Laila A. Mohamed acknowledge the partial financial support from National Institute of Oceanography and Fishers (NIOF), Egypt.
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Mamdouh S. Masoud, Sawsan S. Haggag and Laila A. Mohamed participated in the work supervision and paper writing. Hany Fathy Heiba, contributed to paper writing, figure preparation, results discussion and revised the paper. Omayma H. Abd El-Hamed, Nabil S. Habila, Ibrahim A.M. Abdel-hamid carried out the experimental work.
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Masoud, M.S., Haggag, S.S., Heiba, H.F. et al. Comparative Adsorption Affinities of Nano-Metal Oxides Towards Cr(VI): Synthesis, Characterization, Kinetics, Isotherms, Thermodynamic and Techno-Economics Study. Environ. Process. 10, 33 (2023). https://doi.org/10.1007/s40710-023-00651-w
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DOI: https://doi.org/10.1007/s40710-023-00651-w