Fig. 7

(a-b) PS and (c-d) Cu²⁺ penetration curves in PS and Cu²⁺ co-transport. (e-f) PS and (g-h) Cu²⁺ penetration curves in the synergistic transport of O₃ ageing PS and Cu²⁺. (i-j) PS and (k-l) Cu²⁺penetration curves in UV-aged PS and Cu²⁺ co-transport.