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Comparable investigation of the influence of contact time on copper sorption process: (A) for both MANSG and its parent activated silica gel (Activated SG); (B) for both MANSG and its parent amine-functionalized nano-silica gel (ANSG). Solution concentration of ion = 1000 ppm; amount of adsorbent = 0.25 g; agitation speed = 200 rpm; solution volume = 25 mL; pH = 7.
