In-situ synthesis of calcium/magnesium phosphate system for water de-fluoridation: Clay ceramic materials
| dc.contributor.author | Mahene, Wilson | |
| dc.contributor.author | Hilonga, Askwar | |
| dc.contributor.author | Machunda, Revocatus | |
| dc.date.accessioned | 2023-02-28T09:19:28Z | |
| dc.date.available | 2023-02-28T09:19:28Z | |
| dc.date.issued | 2022-02-15 | |
| dc.description | SDG 6: Clean Water and Sanitation, SDG 3: Good Health and Well-being, SDG 12: Responsible Consumption and Production. | en_US |
| dc.description.abstract | Clay ceramic water filters impregnated with silver colloids have been used to purify water in many parts of East Africa disregarding the removal of fluoride, which is a health-threatening ion in water supplies. This paper presents a synthesis of clay ceramic materials containing in-situ generated calcium/magnesium phosphate system as an adsorbent for water de-fluoridation. The materials were prepared in varied ratios of clay (K) to heat-pretreated dolostone (R) (K:R = 0:100, 90∶10, 85∶15, 75∶25 and 100:0), sintered at temperatures between 500 °C and 900 °C, and characterized using XRF, AAS, CHNS–O analyzer and X-ray PDF analysis. The materials improved in de-fluoridation performance with increase in sintering temperature at 500–700 °C, before exhibiting a sharp drop at 800 °C. The adsorption performance of K:R = 75:25 was higher than that of K:R = 0:100, signifying the effect of clay. The adsorption data obeyed Freundlich isotherm model, suggesting multi-layer adsorption. Fluoride uptake follows pseudo-second-order and intra-particle diffusion models, which suggests a chemisorption process involving rate-limiting intra-particle diffusion. | en_US |
| dc.identifier.uri | https://doi.org/10.1016/j.matchemphys.2021.125539 | |
| dc.identifier.uri | https://dspace.nm-aist.ac.tz/handle/20.500.12479/1809 | |
| dc.language.iso | en | en_US |
| dc.publisher | Elsevier | en_US |
| dc.subject | Clay ceramics | en_US |
| dc.subject | Calcium phosphate system | en_US |
| dc.subject | Water de-fluoridation | en_US |
| dc.subject | Adsorption kinetics | en_US |
| dc.subject | Adsorption isotherms | en_US |
| dc.title | In-situ synthesis of calcium/magnesium phosphate system for water de-fluoridation: Clay ceramic materials | en_US |