Kaolin-SO3H nanoparticles: A new efficient and reusable catalyst for synthesis of 2-substituted benzimidazoles at room temperature
Kaolinite clay found its application in medicine, in toothpaste, in cosmetic and as a food additive.Recently, a specially formulated spray is used in fruit and vegetable production to repel the insects and prevent sunburn.Kaolin-SO3H nanoparticles were prepared via reaction of kaolin and chlorosulfonic acid and characterized by FT-IR, XRD, FESEM, T