Adsorption kinetics of fluoride on bone char and its regeneration

• Autorzy: Hu J. , Wu D. , Rao R. , Liu R. , Lai W.

Identyfikatory

DOI

10.5277/epe170306

• Języki publikacji: EN

Abstrakty

EN

The adsorbent of bone char (BC), produced from the pyrolysis of crushed animal bones, was dominated by the mesopores of the Brunauer Emmett Teller (BET) surface area. The optimal condition for defluoridation with BC was a pH level near 5.0. Chloride and nitrate ions could increase fluoride adsorption capacity in contrast with the effect of sulfate and carbonate ions. The interchangeability between fluoride and hydroxyl groups on BC sorbent was proved by the Fourier transform infrared spectroscopy. Langmuir equation had a better correlation coefficient than the Freundlich equation at various temperatures. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees, Ea and S*, have been calculated to describe the nature of fluoride adsorption onto BC. Negative Delta G degrees and Delta H degrees values at various temperatures indicate a spontaneous process, and its exothermic effect, respectively. However, a positive Delta S degrees value represents an increasing process for entropy. The E-a and S* values ranging from 5 to 40 kj.mol^-1 and 0 to 1, respectively, demonstrated that the adsorption is dominated by physical process, although the adsorption kinetic process was involved external diffusion, intraparticle diffusion and chemical reaction equilibrium stage. A high concentration of NaOH solution increases efficiency of removing adsorbed F^- ions from the BC surface.

Słowa kluczowe

EN

chlorine compounds; fluorine compounds; ions; sodium compounds; sulfur compounds; adsorption kinetics; chemical reaction equilibrium; correlation coefficient; Freundlich equation; optimal conditions; layered double hydroxides; aqueous-solution; drinking water; equilibrium; adsorbent

PL

związki chloru; związki fluoru; jod; związki sodu; związki siarki; kinetyka adsorpcji; równowaga reakcji chemicznej; współczynnik korelacji; równanie Freundlicha; woda pitna; równanie Langmuira

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2017
• Tom: Vol. 43, nr 3
• Strony: 93--112
• Opis fizyczny: Bibliogr. 28 poz., tab., rys.

Twórcy

autor

Hu J.

• School of Resources Environmental and Chemical Engineering, NanChang University, Jiangxi Nanchang, 330031, China
• College of Ecology and Resource Engineering, WuYi University, Fujian Wuyishan, 354300, China

autor

Wu D.

• School of Resources Environmental and Chemical Engineering, NanChang University, Jiangxi Nanchang, 330031, China

autor

Rao R.

• College of Ecology and Resource Engineering, WuYi University, Fujian Wuyishan, 354300, China

autor

Liu R.

• College of Ecology and Resource Engineering, WuYi University, Fujian Wuyishan, 354300, China

autor

Lai W.

• Graduate Institute of Environmental Management, Tajen University, Pingtung, Taiwan

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