Fig. 17

Intra-particle diffusion models for Pb2+ (a, b), Cu2+ (c, d), and Cd2+ (e, f) onto limestone (CaCO3) and calcined limestone (CaO). According to the equation: qt = kIPD t1/2 + C 109.
Intra-particle diffusion models for Pb2+ (a, b), Cu2+ (c, d), and Cd2+ (e, f) onto limestone (CaCO3) and calcined limestone (CaO). According to the equation: qt = kIPD t1/2 + C 109.