Evaluation of Fluoride Adsorption Mechanism and Capacity of Different Types of Bone Char

Benyapa Sawangjang, Phacharapol Induvesa, Aunnop Wongrueng, Chayakorn Pumas, Suraphong Wattanachira, Pharkphum Rakruam, Patiparn Punyapalakul, Satoshi Takizawa and Eakalak Khan
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Benyapa Sawangjang: International Postgraduate Program in Environmental and Hazardous Waste Management, Graduate School, Chulalongkorn University, Bangkok 10300, Thailand
Phacharapol Induvesa: Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom 73170, Thailand
Aunnop Wongrueng: Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Chayakorn Pumas: Center of Excellence in Bioresources for Agriculture, Industry and Medicine, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Suraphong Wattanachira: Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Pharkphum Rakruam: Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Patiparn Punyapalakul: Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10300, Thailand
Satoshi Takizawa: Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8654, Japan
Eakalak Khan: Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, NV 89154-4015, USA

IJERPH, 2021, vol. 18, issue 13, 1-14

Abstract: The fluoride adsorption capacity of three types of bone char (BC), including cow BC (CBC), chicken BC (CKBC), and pig BC (PBC), was examined. At the optimum charring conditions (temperature and time), PBC had the highest hydroxyapatite (HAP) content (0.928 g-HAP/g-BC), while CBC had the highest specific surface area (103.11 m 2 /g-BC). CBC also had the maximum fluoride adsorption capacity (0.788 mg-F/g-HAP), suggesting that fluoride adsorption capacity depends more on the specific surface area of the BC than the HAP content. The adsorption data of CBC, CKBC, and PBC fit well with the pseudo-second-order model and the Langmuir isotherm. The maximum fluoride adsorption capacity of BC reached the maximum value when the solution had a pH of approximately 6.0. Lastly, the highest fluoride desorption occurred when the BCs were soaked in solutions with a pH higher than 11.0.

Keywords: bone char; fluorosis; hydroxyapatite (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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