Synthesis of magnetic graphene composites for preconcentraton trace amounts of malachite green and crystal violet from water

Graphene/silica magnetic nanocomposites are synthesised and introduced as new and reusable adsorbents for rapid and high-efficiency preconcentraton trace amounts of dye pollutants in water. This method is simple, fast, cheap and non-toxic. The optimum adsorption conditions for the preconcentraton of crystal violet (CV) and malachite green (MG) are investigated and the adsorption mechanisms are also discussed. The regeneration and reuse experiments showed the good reusability of the as-prepared adsorbent. In addition, this method was successfully applied to the preconcentraton of trace amounts of MG and CV from water samples, which presages more opportunities for application in environmental and material sciences.