Dendrimer modified magnetic nanoparticles as adsorbents for removal of dyes

The recycling of dendrimers using an ultrafiltration membrane during wastewater treatment is extremely inconvenient. With the combination of magnetic nanoparticles (MNP) with dendrimers, the problem of the recovery of tiny particulate matter from an aqueous solution can be overcome using its magnetism. In this study, the coprecipitation method was adopted to prepare MNP, and then MNP-G(n) (n, generations of dendrimers) was prepared with the formation of the dendrimers on the surface of the MNP. The adsorption of reactive black 5 (RBk5) from an aqueous solution using MNP-G(n) was studied. It was shown that the adsorption data of the composite could be fitted using the Langmuir equation with a maximum adsorption capacity of 70.423 mg g(-1) in the aqueous solution of RBk5 at 25 degrees C. The effects of the initial RBk5 concentration, pH and dendrimer generation were studied and the optimized experimental conditions were obtained. The adsorption capacity increased as the generation of MNP-G(n) increased, and decreased with the rise of the solution pH value. The adsorption of RBk5 with the prepared MNP-G(n) composite was very efficient, and the adsorbent could be recycled using magnetic separation.