Fig. 4From: Facile synthesis of reduced graphene oxide by Tecoma stans extracts for efficient removal of Ni (II) from water: batch experiments and response surface methodologyNon-linear (a) isotherm and (b) kinetic models for Ni (II) removal using rGO-X-25. (c) Separation factor plot of rGO-X-25 for Ni (II) removalBack to article page