Carbonates based nanoparticles synthesis, characterization and their application for wastewater treatment Cristina Coromelci, Andreea Elena Maftei, Mariana Neamtu, Loredana Brinza Alexandru Ioan Cuza University of Iasi, Romania In this work, carbonate nanoparticles (CC) were successfully synthesized in the presence of two organic components (ethylenediaminetetraacetic acid, EDTA and ethylenediamine-N, N′-disuccinic acid, EDDS), and applied as adsorbents for dye removal from distilled water and wastewater respectively. The obtained materials were characterized by SEM, Raman, FTIR, XRD, and BET. Two consecutive processes adsorption and advanced UVA-induced photodegradation, were used for RY84 removal. CC-EDTA 10% proved to have an efficient adsorption capability for dye removal. The present results suggest that for polluted water containing 5 mg/L RY84 an adsorbent dosage of 1 g/L is sufficient to ensure 100% dye removal, whereas, for higher concentrations of RY84 in polluted wastewaters, the CC-EDTA 10% dosage should be adjusted in a nonlinear proportional manner.
Fig. 1. Calcium carbonate nanoparticles synthesized in the presence of organics and used as adsorbents and support for advanced photodegradation of dye removal from wastewater At sites where the concentration of RY84 is veryhigh and the adsorption process becomes less feasible from an economical point of view (due to the high load of adsorbent, for example), a second step, such as UVA irradiation aided by H 2 O 2, might be considered for the RY84 removal. In this case, the total removal of RY84 using the two processes in the presence of 20 mmol/L H 2 O 2 was 88.96%, 75.69%, and 48.71% at dye concentrations of 10 mg/L, 20 mg/L and 40 mg/L, respectively, indicating a substantial improvement of the dye removal compared to the individual processes. In wastewater, a substantial decrease of efficiency was observed in both processes (ca. 4 times via adsorption and ca. 5 times via UVA) due to the presence of other wastewater constituents that inhibits the dye removal. The results suggest that these newly synthesized nanoparticles are good candidates for the cost-efficient removal of wastewater pollutants. Acknowledgements This work was supported by a grant of the Ministry of Research, Innovation and Digitization, CNCS - UEFISCDI, project number PN-III-P1-1.1-TE-2021-0207, within NCDI III.
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