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Electrocoagulation process using transition metals as electrolytes and sacrificial anodes was studied for the removal of boron through formation spinel ferrites. The spinel ferrite (MFe2O4, M = Fe, Cu, Ni, and Co) evolved during electrocoagulation could be promising adsorbents for boron. The parameters such as pH (4 – 12), current density (1.25 – 5 mA/cm2), boron initial concentration (10 – 100 mg/l), and combination pairs of electrodes were studied. The efficiency of boron removal could achieve 95% as electrocoagulation was optimized at conditions: initial B = 10 mg/l, reaction pH 8 ± 0.5, current density = 3.75 mA/cm2, and 60 min reaction. X-ray diffraction (XRD) patterns revealed that several spinel type such as nickel ferrites, cobalt ferrites and copper ferrites were obtained by electrocoagulation process. The adsorption isotherms of spinel type materials fitted by Langmuir and Freundlich models indicated that qmax of nickel ferrites was 28.90 mg/g with pHpzc 10.25. Most of the spinel ferrites were granular crystallites with the crystalline size of around 26 – 30 nm. The highest saturation magnetization was nickel ferrites 50.30 emu/g by vibrating sample magnetometer (VSM) analysis. Magnetic separable spinel ferrites offers easier solid - liquid separation after electrocoagulation process.

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