Cyanide is a toxic compound that is found in industrial wastewater, and it causes death for humans. Therefore, cyanide removal is essential to protect humans and the environment. The electrocoagulation method (ECM) was adopted in this study to remove cyanide from artificial wastewater samples. The ECM was adopted in this study because it is a cost-effective method with minimum use of chemicals, making it eco-friendly. The experiments were done in batch flow using iron electrodes (anode-cathode). The results show an increase in the current density from 2 to 10 mA.cm-2 increased the removal of cyanide by 48.8%. Similarly, the increase of the treatment time from 10 to 90 minutes increased the removal of cyanide by 71% at a current of 10 mA/cm-2. The summary of the results of this study showed that ECM is a good alternative for cyanide removal from wastewater.

Nanostructured CuO and CuO: Al+3 films were grown at various doping conditions via the chemical spray pyrolysis method (CSP). The crystallite size of the grown films obtained by XRD was (12.13-13.84) nm, the microstrain increased from 23.25 to 26.15. The topography of films was studied via AFM. The average diameter was noticed as (57.38), (69.45), and (75.38) nm for the (CuO, CuO: 2% Al3+ and CuO: 4% Al3+) respectively. A UV-Vis spectral analysis gained optical properties. The bandgap values in the range of (1.72-1.92) eV with the increase of Al3+ content. The absorption coefficient increases by aluminum doping. At the same time, the refractive index and Extinction coefficient increases with aluminum content. This result is beneficial for transparent thin films used for optoelectronic devices applications.