Text S1: Characterization of BaM-AC-CS composite powderMorphology of magnetic composite particles was observed using Field Emission Scanning Electron Microscope (FESEM: Nova NanoSEM/ FEI450). The particle size of powder was measured from the FESEM micrograph through ImageJ software. The phase analysis of the BaM-AC-CS composite was performed by X-ray powder diffraction with Co Kα (λ =1.78 Å) radiation using Bruker AXS D8 Advance diffractometer. Fourier transform infrared (FTIR) spectrum of the composite was recorded before and after MB adsorption using an FTIR spectrometer. Brunauer−Emmet−Teller (BET) Surface area of composites was measured using N2 adsorption-desorption isotherms (Quantachrome Corporation/ AUTOSORB-iQMP).The room temperature magnetization behavior of the composite was studied using Vibrating Sample Magnetometer (VSM: Microscan) at an applied field of 15 kOe. To evaluate the surface charge of the composite particles, the pH drift method was used to calculate the point of zero charge (pHPZC) as described previously [1]. Lambda 35, Perkin Elmer spectrophotometer was used to measure the concentration of methyl blue dye in adsorption experiments.
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