Abstract
Abstract A core–shell structure of magnetic ZnLa0.02Fe1.98O4/Polypyrrole (PPy) nanoparticles (NPs) was facilely fabricated at room temperature, in which FeCl3 was used as an initiator. Dodecyl sulfate anions (SDS) were adsorbed onto the outer surface of the ZnLa0.02Fe1.98O4 through the charge compensation. The absorbed SDS induced the adhesion of the PPy to the surface of the ZnLa0.02Fe1.98O4 along with polymerization. The as-prepared composite shows better performance in removal of pollutants like methyl orange (MO) from water by adsorption than that of the ZnLa0.02Fe1.98O4. The adsorption experiments indicated that the adsorption was divided into two processes. The maximum adsorption capacity for MO was determined to be 76.34 mg/g. The experimental data fit the Langmuir model implying the single layer adsorption. The adsorption process was described by the pseudo-second-order kinetic model. The adsorption of MO onto the ZnLa0.02Fe1.98O4/PPy was exothermic process, and the randomness decreased at the process. To decrease experimental temperature is suitable for the adsorption of MO onto the ZnLa0.02Fe1.98O4/PPy.
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