Hydroxyapatite coatings on calcite powder for the removal of heavy metals from contaminated water
| Autor: | Oriol Gibert, Josep Oliva Moncunill, María del Rosario Martínez Martínez, R.M. Darbra, V. Martí, César Valderrama |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya. R2EM - Resource Recovery and Environmental Management, Universitat Politècnica de Catalunya. GREMS - Grup de Recerca en Mineria Sostenible |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
groundwater remediation
Sonication Geography Planning and Development Groundwater remediation Aigua -- Contaminació 02 engineering and technology 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry Hydroxyapatite Coating chemistry.chemical_compound Enginyeria química [Àrees temàtiques de la UPC] heavy metal sorption stomatognathic system calcium carbonate TD201-500 0105 earth and related environmental sciences Water Science and Technology Calcite Water supply for domestic and industrial purposes Ion exchange Precipitation (chemistry) hydroxyapatite coating Sorption Hydraulic engineering 021001 nanoscience & nanotechnology Phosphate Calcium carbonate Water -- Pollution chemistry Heavy metal sorption TC1-978 0210 nano-technology Nuclear chemistry |
| Zdroj: | Water Volume 13 Issue 11 UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Water, Vol 13, Iss 1493, p 1493 (2021) |
| Popis: | An approach for the remediation of heavy metal-contaminated wastewater that is gaining increasing attention is the application of hydroxyapatite (HAP)-based particles. HAP is conventionally synthesized through wet chemical precipitation of calcium and phosphate ions, although later studies have focused on HAP synthesis from solid calcite contacted with a phosphate solution under ambient conditions. This synthesis route can allow saving soluble Ca-chemicals and, thus, make the process more cost-efficient. The aim of this study was to coat natural calcite powder with a layer of HAP for the removal of Zn and Cu from contaminated water. For this purpose, a HAP layer was synthesized on calcite particles, characterized using several complementary techniques and evaluated for the removal of Zn and Cu from synthetic solutions. Sorption kinetics and equilibrium isotherms, as well as the effect of sonication of the synthesized sample on its sorption performance, were determined. The results showed that calcite particles were efficiently coated with a HAP layer with high capacity in removing Zn and Cu from acidic solutions, with a qmax of 34.97 mg/g for Zn (increased to 37.88 g/mg after sonication of the sample) and 60.24 mg/g for Cu (which hardly varied with sonication). The mechanisms behind the sorption of Zn and Cu onto HAP, inferred from pH changes, the relation between metal uptake and Ca2+ release and XRD analysis, included surface complexation, ion exchange and precipitation of new Zn- and Cu-containing phases. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|