synthesis of monodisperse magnetic hydroxyapatite/fe3o4 nanospheres for removal of brilliant green (bg) and coomassie brilliant blue (cbb) in the single and binary systems

Conventional wastewater treatments such as chemical coagulation, activated sludge, trickling filter, carbon adsorption and photo-degradation were used for the removal of dyes. the characteristics of (hap /fe3o4) were investigated using fourier transform infrared (ftir) and scanning electron microscope (sem). the surface area was measured by the brunauer–emmett–teller (bet) nitrogen adsorption apparatus. the crystal phases of the products were characterized by x-ray diffraction with monochromatic cu ka radiation. selectivity analysis for binary system dye removal was investigated. the effect of operational parameter (adsorbent dosage, dye concentration and salt) on dye removal was evaluated in details. uv–vis spectrophotometer was employed for absorbance measurements of samples. the maximum wavelength used for determination of residual concentration of cbb and bg in supernatant solution using uv–vis spectrophotometer were 627 nm, 629 nm, respectively. the effect of adsorbent dosage on dye removal from single (sin.) and binary (bin.) systems was investigated by contacting 10 ml of dye solution with initial dye concentration of 5 mg/l at single (sin.) and binary (bin.). in this paper, monodisperse magnetic hap (hap/fe3o4) microspheres was synthesized and used for the remove dye from single (sin.) and binary (bin.) systems.