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- Title
Characteristics of Zinc Oxide and Carbonized Sawdust Nanocomposite in the Removal of Cadmium(II) Ions from Water.
- Authors
Aigbe, Racheal; Akhayere, Evidence; Kavaz, Doga; Akiode, Olubunmi Kolawole
- Abstract
In this research, the removal of cadmium(II) ions (Cd) from wastewater using zinc oxide nanoparticles (ZnONp) and carbonized sawdust composite was examined. ZnONp were synthesized by precipitation using sodium hydroxide (NaOH) and zinc nitrate tetrahydrate as precursors, while carbonized sawdust was produced from sawdust obtained from a nearby wood plant. The synthesized ZnONp were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy and X-ray diffractometry (XRD). The adsorption of Cd(II) ions from wastewater was investigated at varying initial concentrations (10–200 mg/L). The preliminary method was coordinated in batches treated with ZnONp, carbonized sawdust and ZnONp/carbonized sawdust composite. The effects of factors such as pH, contact time, initial concentrations of the adsorbate and adsorbent and temperature were inspected. The experiments showed that the best sorption time was 100 min and that the pseudo-second-order model, with a regression coefficient (R2) of 0.999, gave the best description for the sorption kinetics. Isotherm analyses were also conducted to further understand the sorption process. The results indicated that Freundlich isotherms gave the best fit for the sorption reaction with an R2 assessment of 0.9989, which shows the proximity of Cd adsorption in a multiple-layer structure on the adsorbent. Both models and data indicated that ZnONp–carbonized sawdust gave higher sorption fulfilment levels, removing Cd(II) ions with a 90% efficiency rate. The reusability study also showed that the adsorbents can be reused with high efficiency after two cycles of reuse.
- Subjects
WOOD waste; FOURIER transform infrared spectroscopy; CADMIUM; IONS; ULTRAVIOLET-visible spectroscopy
- Publication
Water, Air & Soil Pollution, 2021, Vol 232, Issue 11, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-021-05364-0