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This paper reports a new approach to treat the cobalt containing wastewater by in situ co-precipitation of Zn/Al layered double hydroxides (LDHs). LDHs with various metal compositions were characterized by XRD, and their capabilities to remove Co2+ were examined. Zn/Al system was found to be the best Co-removing LDHs system, which could remove Co2+ at the highest efficiency (> 99.99%). Reaction...