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- Title
Study of removal process of manganese using synthetic calcium hydroxyapatite from an aqueous solution.
- Authors
Gogoi, Diganta; Shanmugamani, A.G.; Rao, S.V.S.; Kumar, T.; Velmurugan, S.
- Abstract
Calcium hydroxyapatite (HAP) was synthesized by a precipitation method, and it was characterized by the XRD technique. The removal of manganese(II) from an aqueous solution on HAP as a function of contact time, pH, ionic strength, temperature, and other monovalent and bivalent ions was studied using a radiotracer,54Mn, in the batch process. The sorption of manganese on HAP was pH independent ranging from 4 to 6 due to the buffering properties of HAP. The sorption of manganese was rapid, and the percentage of manganese sorption was 99% during the first 20–30 min of the contact time,when the initial concentration of manganese ions was 1 mg/L (ppm) at pH of 5.The sorption kinetics showed that the sorption of manganese on HAP could be simulated by the pseudo-second-order kinetic model very well. The maximum sorption capacity of HAP for manganese calculated based on the Langmuir model was ~58.99 mg/g at pH 5.1 andT = 300 K. The thermodynamic parameters from the temperature-dependent sorption isotherms indicated that the manganese sorption on HAP was an endothermic and spontaneous process. It was observed that in the presence of bivalent ions like Co2+, the manganese sorption by HAP decreases, whereas it remains same in the presence of monovalent ions like Na+.
- Subjects
CALCIUM compounds; CHEMICAL synthesis; MANGANESE; PRECIPITATION (Chemistry); APATITE
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 14, p6566
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1010588