Fig. 3.
a Cumulative concentration of Na+ (a and b), Al3+ (c and d) and Si4+ (e and f) ions released from ZSM-5, ZA and ZX, and b cumulative concentration fitted with h−0.5 for Na+ (g and h), Al3+ (i and j) and Si4+ (k and l) ions released from ZSM-5, ZA and ZX after soaking in FaSSGF and FeSSGF, respectively