Abstract The temperature effect on the corrosion behavior of copper that was inhibited by 3,4'-bi-1,2,4-Triazole in NaCl 3% Medium was investigated using potentiodynamic polarization techniques. Inhibition effect was found to increase with decreasing the temperature. Polarization curves showed that 3,4'-bi-1,2,4-Triazole (bTA) act as mixed type inhibitors in 3% NaCl Medium. The obtained results showed that the 3,4'-bi-1,2,4-Triazole could serve as an effective inhibitor of the copper corrosion in 3% NaCl Medium at various temperature up to 55°C.  Keywords: copper, neutral salt-spray corrosion; electrochemical corrosion; corrosion behavior; corrosion resistance, 1,2,4-Triazole.

Mono-(Fe) and bimetallic Co x –Fe1–x –MOF with different Co and Fe contents was successfully synthesized by the solvothermal method. The structural properties of the prepared samples were characterized by X-ray diffraction, transmission electron microscopy (TEM), Brunauer–Emmett–Teller specific surface area, and Fourier transform infrared spectroscopy. The results revealed the successful formation of mono and mixed Co x –Fe1–x –MOF. Also, the results of TEM displayed that the particle structure of Co x –Fe1–x –MOF changed to octahedral after the addition of cobalt. The surface acidity results illustrated that the samples showed both Lewis and Brønsted acid sites, and Co x –Fe1–x –MOF possessed more surface acidity than Fe–MOF. The catalytic performance of the prepared samples was tested by synthesis of 14-phenyl-14H-dibenzo [a, j] xanthene (xanthene), and bimetallic Co x –Fe1–x –MOF showed higher activity compared to monometallic Fe–MOF. The sample with Co0.50–Fe0.50–MOF gave the highest yield of xanthene with 90.2%. In addition, the prepared samples were used for removal of Pb2+ and Cd2+ ions from the aqueous solution. The sample with Co0.50–Fe0.50–MOF showed the highest removal efficiency compared with mono- and other bimetallic samples. The results illustrated that the addition of Co to Fe enhanced the structural properties, acidity, and catalytic performance of the prepared samples due to the synergistic effect between Fe and Co ions. According to the obtained results, the prepared samples showed great potentials for the synthesis of pharmacologically active compounds and environmental protection.