Optimization of fluoride adsorption from aqueous solution over mesoporous titania‐alumina composites using Taguchi method

A new medium, eggshell powder has been developed for fluoride removal from aqueous solution. Fluoride adsorption was studied in a batch system where adsorption was found to be pH dependent with maximum removal efficiency at 6.0. The experimental data was more satisfactorily fitted with Langmuir isotherm model. The kinetics and the factor controlling adsorption process fully accepted by pseudo-second-order model were also discussed. Eawas found to be 45.98 kJmol-1by using Arrhenius equation, indicating chemisorption nature of fluoride onto eggshell powder. Thermodynamic study showed spontaneous nature and feasibility of the adsorption process with negative enthalpy (∆H0) value also supported the exothermic nature. Batch experiments were performed to study the applicability of the adsorbent by using fluoride contaminated water collected from affected areas. These results indicate that eggshell powder can be used as an effective, low-cost adsorbent to remove fluoride from aqueous solution as well as groundwater.

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Keratin nanoparticles obtained from human hair for removal of crystal violet from aqueous solution: Optimized by Taguchi method

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2019.12.065 ◽

2020 ◽

Vol 143 ◽

pp. 492-500 ◽

Cited By ~ 5

Author(s):

Fereshteh Abbasi ◽

Mohammad Tavakkoli Yaraki ◽

Abdolhadi Farrokhnia ◽

Mehrdad Bamdad

Keyword(s):

Aqueous Solution ◽

Taguchi Method ◽

Crystal Violet ◽

Human Hair

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Study about Doping Ion La3+ onto Surface of Pyrolusite Ore for Removing Simultaneously Both Fluoride and Phosphate from Wastewater

Journal of Chemistry ◽

10.1155/2017/4893835 ◽

2017 ◽

Vol 2017 ◽

pp. 1-11

Author(s):

Nguyen Thi Hue ◽

Nguyen Hoang Tung

Keyword(s):

Aqueous Solution ◽

Kinetic Studies ◽

Phosphate Adsorption ◽

Fluoride Removal ◽

Fluoride Adsorption ◽

Pseudo Second Order ◽

Xrd Techniques ◽

Adsorbent Characterization ◽

Coexisting Ions

Lanthanum has been doped onto the surface of the natural Pyrolusite for simultaneous removal of phosphate and fluoride in aqueous solution. The adsorbent characterization of the materials was observed by the SEM, BET, and XRD techniques. The dynamics and isotherms models of fluoride and phosphate adsorption, with respect to pH, pHPZC, adsorbent dose, and effect of coexisting ions, were studied. The results showed that lanthanum doped Pyrolusite ore (LDPO) relatively highly adsorbed amount of phosphate and fluoride from aqueous solution. Phosphate and fluoride removal efficiencies of LDPO are approximately 97% and 95%, respectively. Pseudo-first order for kinetic studies of phosphate and fluoride removal of the LDPO was observed with high correlations for fluoride but weak correlations for phosphate. However, pseudo-second order for kinetic studies was high correlation for both phosphate and fluoride. The phosphate and fluoride adsorption capacities of the LDPO significantly decreased with the existence of coions (sulfate, chloride, and nitrate) in the aqueous solution.

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