FLUORIDE REMOVAL WITH CALCIUM OXIDE-ALUMINA SPHERES

Öz

In this study, calcium oxide (CaO) and alumina (Al2O3) composite spheres were synthesized and their performance in fluoride removal was investigated. The CaO-Al2O3 spheres were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) surface area, Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The data obtained from batch adsorption experiments were evaluated by Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D-R) isotherm models. The maximum adsorption capacity (qm) was found to be 1.488 mg.g-1. The adsorption energy calculated from the D-R isotherm model (E>8 kJ.mol-1) indicated chemical adsorption. Adsorption kinetics were investigated by pseudo-first-order (PFO), pseudo-second-order (PSO) and intraparticle diffusion kinetic models. It was found to be compatible with the PSO model. Thermodynamic analyses showed that the process was spontaneous (ΔG<0), endothermic (ΔH>0), and chemical adsorption (ΔH>40 kJ.mol-1). A positive ΔS value indicated that the degrees of freedom at the solid-liquid interface increased, and that the adsorption efficiency increased with increasing temperature.

Anahtar Kelimeler

• Fluoride Removal
• Adsorption
• Calcium Oxide-Alumina Sphere
• Water Treatment

KALSİYUM OKSİT-ALUMİNA KÜRELERİ İLE FLORÜR GİDERİMİ

Öz

Bu çalışmada, kalsiyum oksit (CaO) ve alümina (Al2O3) kompozit küreleri sentezlenerek florür giderimindeki performansları araştırılmıştır. CaO-Al2O3 küreleri taramalı elektron mikroskobu (SEM), enerji dağılımlı X-ışını spektroskopisi (EDX), Brunauer-Emmett-Teller (BET) yüzey alanı, Fourier Dönüşümlü Kızılötesi Spektroskopisi (FTIR) ve X-ışını kırınımı (XRD) ile karakterize edilmiştir. Kesikli adsorpsiyon deneyleri sonucunda elde edilen veriler Langmuir, Freundlich, Temkin ve Dubinin–Radushkevich (D-R) izoterm modelleri ile değerlendirilmiştir. Maksimum adsorpsiyon kapasitesi (qm) 1,488 mg.g-1 bulunmuştur. D-R izoterm modelinden hesaplanan adsorpsiyon enerjisi (E>8 kJ.mol-1) kimyasal adsorpsiyona işaret etmiştir. Adsorpsiyon kinetiği yalancı birinci dereceden (PFO), yalancı ikinci dereceden (PSO) ve partikül içi difüzyon kinetik modelleri ile incelenmiştir. PSO model ile uyumlu olduğu görülmüştür. Termodinamik analizler, sürecin kendiliğinden (ΔG<0), endotermik (ΔH>0) ve kimyasal adsorpsiyon (ΔH>40 kJ.mol-1) olduğunu göstermiştir. Pozitif S değeri katı-sıvı ara yüzeyindeki serbestlik derecesinin arttığını göstermiştir ve artan sıcaklıkla birlikte adsorpsiyon veriminin yükseldiğini ortaya koymuştur.

Anahtar Kelimeler

• Florür Giderimi
• Adsorpsiyon
• Kalsiyum Oksit-Alümina Küreleri
• Su Arıtımı

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