Metal ions are reported as pollutants, due to their mobility in natural water ecosystems and due to their toxicity. The problem associated with metal ionspollution is that they are not biodegradable, cannot be metabolized or decomposed, and are highly persistent in the environment [1]. In the recent years the NM were successfully tested as adsorbent materials for metal ions [2] removal. With purpose to remove heavy metal ions from solutions, two types of adsorbents have been used: (i) mineral adsorbents-diatomite (D1) and modified diatomite with sulphuric acid (D2); (ii) carbonaceous adsorbents modified with manganese compounds and treated at 250 ºC (E-3-1.0Mn-s-250, P1) and 450 ºC (E-3-1.0Mn-450, P2). Batch experiments were performed in order to evaluate adsorptionconditions for Cu2+, Zn2+, Co2+ and Ni2+. The metal ions adsorption equilibrium was established within 60 min, at normal temperature and pH ~6. The results indicated that the adsorption fitted well with the pseudo-second order kinetic model. The maximum adsorptioncapacities were determined, and the removalefficiency decrease in order: P1 > D1 > P2 > P1.Acknowledgments This work was partially supported by Program no 2, Project no. 2.4 from the Institute of Chemistry Timisoara of Romanian Academy, by an inter-academic exchanges between Romania and Moldova, and by a grant of Romanian National Authority for Scientific Research and Innovation, CNCS – UEFISCDI, project number PN-II-RU-TE-2014-4-1319. References 1. GeF., Li M.M., YeH., ZhaoB.X., J. Hazard. Mater. 211-212 (2012) 366-372. 2. Dubey R.S., XavierR., Sci. J. Eng. 1(1) (2015) 30-36.