Silica layers as masks in Ag+-Na+ ion exchange processes

Rogoziński, R.; Tyszkiewicz, Cuma; Karasiński, Paweł; Żelechower, M.; Szala, J.

doi:10.1016/j.tsf.2016.06.043

Cited by 3 publications

(1 citation statement)

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“…Fluoride can be removed from water by employing a number of processes, including adsorption and biosorption (Chatterjee & De, 2014); ion-exchange (Rogoziński, Tyszkiewicz, Karasiński, Żelechower & Szala, 2016); chemical precipitation, which may include electro-coagulation/flotation (Drouiche et al, 2012); and membrane processes, such as reverse osmosis (Shen, Richards & Schäfer, 2016), dialysis (Kir & Alkan, 2006), nano-filtration (Jadhav, Marathe & Rathod, 2016), and electrodialysis (Arahman, Mulyati, Lubis, Takagi & Matsuyama, 2016). Most methods for removing fluoride have drawbacks, including highinitial costs, lack of selectivity, low capacity, and difficulty in operation or regeneration.…”

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confidence: 99%

Application of spheroidal agglomerates of γ-Al2O3 in the fluoride removal from aqueous medium

et al. 2019

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A spheroidal agglomerate γ-Al2O3 adsorbent obtained from pseudoboehmite for effective removal of fluoride from aqueous medium was investigated in the present study. The surface properties were characterized by several techniques: XRD, physisorption of N2, FE-SEM/EDS, 27Al NMR, FT-IR Pyridine adsorption, PZ and particle size. Batch experiments were conducted and they were compared with a commercial activated alumina (AA). The process was carried out at pH 5, 7, and 9, then at 25 and 35 ºC. Batch experimental results indicated that the spheroidal agglomerates of γ-Al2O3 remove up to 15 mg/g with a higher adsorption capacity than AA of 13 mg/g, at pH 5, studied at 25 and 35 °C. The F− adsorption processes in γ-Al2O3 and AA followed the pseudo-first-order kinetics and the Langmuir isotherm. The results showed an adsorbent effective for removal of F−.

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