Composition operator on F(p,q,s) spaces in the unit ball of Cn

In this paper, the authors characterize those phi, holomorphic self-maps of B, for which the composition operator C-phi is bounded (or compact) on F(p,q,s) in some cases. Moreover, the following results are given. (1)If 1 < p < q + n + 1 and C phi satisfies some boundedness conditions, then C-phi is compact on F(p,q,s) if and only iflim(|z|-> 1-)1-|z|(2 )/1-|phi(z)|2=0. (2) If 1 <= p 0.960). The kinetic curves showed equilibrium conditions after 300 min, and the pseudo-second-order model presented a better correlation with the data for all curves (R-2 > 0.998). Biochars produced in this study can be effectively applied in processes involving iron ion removal.