Environmental-friendly calcium ferrites prepared by using different Ca:Fe molar ratios, different calcination temperatures as well as different synthesis processes result with excellent features in adsorb different pollutants from aqueous environments. From physical-chemical characterizations, colloidal, structural, and optical properties are consistent across samples from both synthesis methods. Materials obtained via sol-gel combustion method calcined under 600°C exhibit Ms values ranging from 10 to 40 Am² kgFe⁻¹ while just thermal degraded samples calcined at 1200°C result with magnetic features. Additionally, low coercivity and magnetic remanence values indicating almost-superparamagnetic nanoclusters formation in both synthesized samples. Sol-gel combusted samples exhibit an higher surface areas compared with thermal degraded ones, ranging from 20 to 170 m²/g. Samples obtained via both method show high photocatalytic capacities against dyes, with maximum values of 3.4 mgdye gsample-1 in methylene blue and 1.2 mgdye gsample-1 in methyl orange removal. However, these samples result worse in adsorb dyes with conversions that reach a maximum of 30-35%. Thus, in order to completely degrade/remove dyes from aqueous environments, these two effect should be used synergistically. Furthermore, PO43- adsorption capacities are excellent, ranging from 5 to 120 mgPO₄³⁻ mgsample -1, especially for TD samples. Lastly, many samples show great heavy metal adsorption capacity with values for Cu2+, Zn2+ and Fe3+ that arrive at 10 mgM+ gsample-1 with a 100% removal.
Calcium Ferrites as Adsorbent Agents in Wastewater Treatment / Vespignani, M.; Araújo, M. H. P.; Zanoni, I.; Ortelli, S.; Blosi, M.; Artusi, C.; Amadori, S.; Costa, A. L.. - (2025). ( WORKSHOP Geopolymer for Environmental Remediation).
Calcium Ferrites as Adsorbent Agents in Wastewater Treatment
M. Vespignani;
2025-01-01
Abstract
Environmental-friendly calcium ferrites prepared by using different Ca:Fe molar ratios, different calcination temperatures as well as different synthesis processes result with excellent features in adsorb different pollutants from aqueous environments. From physical-chemical characterizations, colloidal, structural, and optical properties are consistent across samples from both synthesis methods. Materials obtained via sol-gel combustion method calcined under 600°C exhibit Ms values ranging from 10 to 40 Am² kgFe⁻¹ while just thermal degraded samples calcined at 1200°C result with magnetic features. Additionally, low coercivity and magnetic remanence values indicating almost-superparamagnetic nanoclusters formation in both synthesized samples. Sol-gel combusted samples exhibit an higher surface areas compared with thermal degraded ones, ranging from 20 to 170 m²/g. Samples obtained via both method show high photocatalytic capacities against dyes, with maximum values of 3.4 mgdye gsample-1 in methylene blue and 1.2 mgdye gsample-1 in methyl orange removal. However, these samples result worse in adsorb dyes with conversions that reach a maximum of 30-35%. Thus, in order to completely degrade/remove dyes from aqueous environments, these two effect should be used synergistically. Furthermore, PO43- adsorption capacities are excellent, ranging from 5 to 120 mgPO₄³⁻ mgsample -1, especially for TD samples. Lastly, many samples show great heavy metal adsorption capacity with values for Cu2+, Zn2+ and Fe3+ that arrive at 10 mgM+ gsample-1 with a 100% removal.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
