Theodora-Paraschiva Gheorghe
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Theodora-Paraschiva Gheorghe has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Alina Catrinel Ion
Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 011061 Bucharest, Romania
1 shared publication - Bianca-Maria Linca
Horia Hulubei National Institute for Physics and Nuclear Engineering—IFIN HH, SALMROM Laboratory, 077125 Magurele, Romania
1 shared publication - Georgiana Martinica
Department of Analytical Chemistry and Environmental Engineering, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, Romania
1 shared publication - Ileana Radulescu
Horia Hulubei National Institute for Physics and Nuclear Engineering—IFIN HH, SALMROM Laboratory, 077125 Magurele, Romania
1 shared publication - Ion Ion
Department of Analytical Chemistry and Environmental Engineering, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, Romania
1 shared publication - Vasilica Tucureanu
National Institute for Research and Development in Microtechnologies IMT-Bucharest, 077190 Bucharest, Romania
1 shared publication
Latest Publications
- Open Access
Effect of Manganese Oxide Sand Used in Water Treatment in Removing 222Rn and Mn2+, Fe2+, NH4+, and NO3− from Groundwater
In this study, the possibility of 222Rn removal through the deferrization/demanganization applied for water treatment was considered, assuming a sorption process. This study demonstrates the possible removal of dissolved radon from groundwater using manganese oxide sand (MnO2) employed in conventional water treatment systems. Four groundwater samples with varying chemical compositions were treated, and the simultaneous removal of 222Rn, Mn2+, Fe2+, NH4+, and NO3− was evaluated. Radon activity was quantified using a Lucas scintillation cell coupled with a Pylon AB-5 system, while inorganic ions were analyzed by ion chromatography. Structural characterization of MnO2 sand by XRD, SEM–EDS, and FTIR confirmed a heterogeneous oxide surface favorable for adsorption. The treatment achieved average removal efficiencies of 95% for 222Rn, 79% for Mn2+, 87% for Fe2+, 85% for NH4+, and 73% for NO3−. Equilibrium adsorption capacities increased with initial contaminant concentrations, indicating a multi-species uptake. Importantly, radon removal was largely independent of coexisting ions. These results reveal the benefit of MnO2-based water treatment, offering an effective solution for simultaneous radon and inorganic contaminant mitigation.
Open AccessEffect of Manganese Oxide Sand Used in Water Treatment in Removing 222Rn and Mn2+, Fe2+, NH4+, and NO3− from Groundwater
In this study, the possibility of 222Rn removal through the deferrization/demanganization applied for water treatment was considered, assuming a sorption process. This study demonstrates the possible removal of dissolved radon from groundwater using manganese oxide sand (MnO2) employed in conventional water treatment systems. Four groundwater samples with varying chemical compositions were treated, and the simultaneous removal of 222Rn, Mn2+, Fe2+, NH4+, and NO3− was evaluated. Radon activity was quantified using a Lucas scintillation cell coupled with a Pylon AB-5 system, while inorganic ions were analyzed by ion chromatography. Structural characterization of MnO2 sand by XRD, SEM–EDS, and FTIR confirmed a heterogeneous oxide surface favorable for adsorption. The treatment achieved average removal efficiencies of 95% for 222Rn, 79% for Mn2+, 87% for Fe2+, 85% for NH4+, and 73% for NO3−. Equilibrium adsorption capacities increased with initial contaminant concentrations, indicating a multi-species uptake. Importantly, radon removal was largely independent of coexisting ions. These results reveal the benefit of MnO2-based water treatment, offering an effective solution for simultaneous radon and inorganic contaminant mitigation.