Eggshell-Derived Nanohydroxyapatite Adsorbent for Defluoridation of Drinking Water from Bofo of Ethiopia

Workeneh, Kifle; Zereffa, Enyew Amare; Segne, Toshome Abdo; Eswaramoorthy, Rajalakshmanan

doi:10.1155/2019/2458312

Cited by 11 publications

(2 citation statements)

References 32 publications

(41 reference statements)

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“…Metals 2023, 13, x FOR PEER REVIEW 5 of 2 ((Ca10(PO4)6(OH)2) according to the Powder Diffraction File (00-076-0694, 00-003-0747, 00 073-1731, 00-086 -0740, 00-074-0566). Identical X-ray diffraction patterns have bee reported in other studies for HAp obtained from eggshell [15,19,24,26,32]. According t the Scherrer equation applied to the highest diffraction peak (2θ ≈ 31.8), the size of th crystallite (D) was determined [19]:…”

Section: Characterization Of the Synthesized Hap And Deposited Filmsmentioning

confidence: 67%

Electrophoretic Deposition of Chitosan–Hydroxyapatite Films and Their Electrochemical Behavior in Artificial Plasma

Mata-Davila,

Arrieta-Gonzalez,

Perez-Arizmendi

et al. 2023

Metals

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The electrochemical behavior of chitosan–hydroxyapatite films deposited on Ti CP was evaluated. Hydroxyapatite was synthesized from eggshell at different precipitation pH conditions. The films were deposited on the Ti CP surface from chitosan–hydroxyapatite solutions by means of electrophoretic deposition. The hydroxyapatite content of the solutions varied from 0 to 20 g/L. The different films obtained were evaluated by means of electrochemical measurements such as polarization curves, open circuit potential measurements, polarization resistance, and electrochemical impedance. The results obtained showed that regardless of the precipitation pH, it is possible to obtain pure hydroxyapatite from a waste such as eggshell. The incorporation of hydroxyapatite within the chitosan structure allows for improvement of the electrochemical performance of the bare Ti CP surface. It was observed that the passive zone was achieved at lower current densities, and that the stability zone of the passive layer increased. Electrochemical impedance analyzes showed that there is an improvement in corrosion resistance due to a more controlled growth of the passive layer that allows for the formation of a dense and compact film.

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Section: Characterization Of the Synthesized Hap And Deposited Filmsmentioning

confidence: 67%

Electrophoretic Deposition of Chitosan–Hydroxyapatite Films and Their Electrochemical Behavior in Artificial Plasma

Mata-Davila,

Arrieta-Gonzalez,

Perez-Arizmendi

et al. 2023

Metals

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“…Eighty percent of diseases globally are thought to be caused by drinking water of poor quality. Fluoride-contaminated drinking water is said to be the cause of 65% of endemic uorosis (Workeneh et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Fluoride from Water Using Aluminum Hydroxide Modified Activated Carbon from Composte Coffee Husk and Corn Cob

Hirbo,

Hola

2023

Preprint

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The earth's crust contains the highest concentration of fluoride minerals. Long-term exposure to water containing fluoride concentrations higher than the 1.5 mg/L WHO recommendation can be harmful to one's health and cause dental, skeletal fluorosis, neurological, and thyroid problems. Therefore, it is imperative to create an affordable, accessible, and eco-friendly way to remove fluoride from water using activated carbon made from a locally available composite of maize cob and coffee husk. In this study, coffee husk and maize cob were ground, dried, and calcined in a muffle furnace at 500°C for two hours. The materials were then activated with a 30% aqueous Al (OH)3 solution. To describe its properties, the resultant activated carbon—known as CMAC (coffee husk and maize cob derived activated carbon) was put through proximate and ultimate analysis. Using batch adsorption methods, the impact of several parameters, including pH, sorbent dosage, contact time, and initial fluoride concentration, is investigated with respect to the extraction of fluoride. The adsorption kinetics were investigated using pseudo first and second-order kinetic analysis, and Freundlich and Langmuir isotherms were used for analysis. The study's maximum fluoride removal efficiency of 88.1 percent was attained with an initial fluoride concentration of 10 mg/L, pH of 3, contact time of 90 minutes, and adsorbent dosage of 3 grams. It is discovered that CMAC works well as an adsorbent to remove fluoride from water. The study's adsorption data had pseudo-second-order kinetics (R^2 = 0.957) and a high coefficient of determination (R^2 = 0.976), indicating a good fit to the Freundlich isotherm model. These results point to a high potential for efficiently removing fluoride from aqueous solution using the modified adsorbent CMAC composite.

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Feasibility studies on fluoride removal by thermally treated adsorbent developed from the waste snail shells

Mukkanti

Tembhurkar

2023

Environ Dev Sustain

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Eggshell-Derived Nanohydroxyapatite Adsorbent for Defluoridation of Drinking Water from Bofo of Ethiopia

Cited by 11 publications

References 32 publications

Electrophoretic Deposition of Chitosan–Hydroxyapatite Films and Their Electrochemical Behavior in Artificial Plasma

Electrophoretic Deposition of Chitosan–Hydroxyapatite Films and Their Electrochemical Behavior in Artificial Plasma

Biosorption of Fluoride from Water Using Aluminum Hydroxide Modified Activated Carbon from Composte Coffee Husk and Corn Cob

Feasibility studies on fluoride removal by thermally treated adsorbent developed from the waste snail shells

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