Shimada et al. used waste newspaper as raw material for the production of activated carbon. The developed adsorbent showed good sorption capacity as evident by iodine (1310 mg/g) and methylene blue numbers (326 mg/g). The removal of Cu2+ from water was investigated using adsorbents prepared from paper industry waste (de-inking paper sludge and sludge from virgin pulp mill) [307]. Experimental results showed that de-inking paper sludge lead to mesoporous materials whereas the sludge from virgin pulp mill produced high microporous adsorbents. Adsorbent materials were then used for Cu2+ removal from water at acid pH. During water treatment, heavy metals lixiviation from adsorbent materials was not produced. However, Ca and Mg leaching was observed. Final pH significantly increased after treatment of water with adsorbent materials probably due to their elevated CaCO3 content. In general, highest Cu2+ removal was obtained using adsorbent materials from de-inking paper sludge. This result could be due to their higher content in oxygenated surface groups, high average pore diameter, elevated superficial charge density, high CaCO3 amount and high Ca and Mg exchange content.