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Título: Fast and effective arsenic removal from aqueous solutions by a novel low-cost eggshell byproduct
Palavras-chave: Waste valorization
Circular economy
Calcium arsenate
Data do documento: 20-Ago-2021
Editor: Elsevier
Citação: RIBEIRO, I. C. A. et al. Fast and effective arsenic removal from aqueous solutions by a novel low-cost eggshell byproduct. Science of the Total Environment, [S.l.], v. 783, p. 1-11, Aug. 2021. DOI: 10.1016/j.scitotenv.2021.147022.
Resumo: Developing alternative green solutions for local and correct recycling of eggshells waste (ES) are needed by the egg-processing industries. In this study, we proposed transforming ES into a novel low-cost chemical compound named hydroxyl-eggshell (ES-OH) and investigated its capacity for arsenic (As) removal from aqueous solutions. Laboratory experiments were conducted to investigate the effects of ES-OH doses, pH, kinetics, and isotherms on As removal efficiency. The kinetics study showed that ES-OH removed nearly all As from solution in less than 15 min. The pseudo-second-order model described the process, and the maximum As removal capacity predicted by the Langmuir isotherm model was 529 mg g−1. Using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray detector (SEM-EDS), and X-ray diffraction (XRD), we found that the As removal mechanism by ES-OH was due to vladimirite precipitation, followed by weak electrostatic interactions between the precipitate and arsenate ions. Finally, after an economic analysis, we conclude that besides being a novel and economical income source, egg-producing companies might implement the ES-OH production process as a local environmentally-friendly way of recycling eggshells and reducing water As contamination.
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