| Summary: | <em><span lang="EN-US">The nanoparticles (NP) <span class="SpellE">ZnO</span> and <span class="SpellE">CuO</span> were synthesized by electrochemical-thermal method. The influence of<span class="SpellE">cetyltrimethylammonium</span> bromide (CTAB) on size and morphology of NP was evaluated. They were characterized by powder X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), <span class="GramE">UV</span>-Visible absorption spectroscopy. The average crystallite size and the average grain size of NP decreased with CTAB concentration. The CTAB significantly affected the morphology of <span class="SpellE">CuO</span> and <span class="SpellE">ZnO</span> NP. The regular spindle shape of <span class="SpellE">CuO</span> transformed into irregular spherical shape and the homogeneity in the morphology of spherical <span class="SpellE">ZnO</span> NP was lost with increase in CTAB concentration. The effect of morphology and size of <span class="SpellE">ZnO</span> on its <span class="SpellE">photocatalytic</span> activity was evaluated by subjecting methylene blue (MB) dye to <span class="SpellE">photocatalytic</span> degradation under the irradiation of UV light. The color removal of MB dye during electrolysis was monitored by UV-Visible spectroscopy. The highest <span class="SpellE">photocatalytic</span> activity was noticed for <span class="SpellE">ZnO</span> 10 <span class="SpellE">mM</span> CTAB.</span></em>
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