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The performance of amended micrometric iron particles (Fe⁰) in trimetallic systems for the removal of aqueous diclofenac (DF) was investigated. Tested additive metals were Pd, Cu and Ni. Trimetallic systems were shown superior to Fe⁰ for aqueous DF removal both under oxic and anoxic conditions. The extent of DF removal varied with (i) the combination of the additives, (ii) the order of plating on Fe⁰ surface, (iii) the availability of dissolved oxygen and (iv) the presence of MnO₂. In comparison with previous results for bimetallic systems: (i) DF reduction products were observed under anoxic conditions for all trimetallic systems and only in some bimetallic systems; and (ii) under oxic conditions, DF reaction products were only observed in CuPdFe system. This was accredited to the intrinsic and electronic properties of the involved metals. Rapid DF removal was mainly attributed to the capacity of additive metals to …