Islamic Azad University North Tehran Branch

About: Islamic Azad University North Tehran Branch is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 868 authors who have published 968 publications receiving 9987 citations.

The effect of ZnO-based carbonaceous materials for degradation of benzoic pollutants: a review

Abstract: The presence of dyes and benzoic derivatives in wastewater and water resources is one of the issues gaining global attention. Persistence, toxicity, and carcinogenic potential of these compounds create a severe impact on aquatics and human beings which make its removal essential before discharging into the environment. Photocatalytic processes driven by ZnO nanostructure semiconductors have great potential for water decontamination because of low cost, environmentally friendly, and complete mineralization of pollutants. Despite its high efficiency under ultraviolet light, zinc oxide with a 3.37 eV of band gap has a limited application under irradiation of visible light. Furthermore, the process time of photocatalytic activity was decreased by fast recombination of pairs of electron–hole. Therefore, to overcome this problem, the composition of carbonaceous materials doped with ZnO in the form of binary or tertiary nanocomposite has been studied. Due to their unique properties, carbonaceous materials have been chosen as a way to synthesize a high-efficiency semiconductor photocatalyst. Our review article considers on the new development of ZnO-doped carbonaceous material for the degradation of dyes and benzoic compounds.

A new electrochemical sensor based on a nitrogen-doped graphene/CuCo2O4 nanocomposite for simultaneous determination of dopamine, melatonin and tryptophan

Abstract: A new nanocomposite based on nitrogen-doped graphene nanosheets/CuCo2O4 nanoparticles was prepared and used as an electrode material for simultaneous determination of dopamine, melatonin and tryptophan. For this purpose, CuCo2O4 nanoparticles were supported on porous nitrogen-doped graphene nanosheets by a simple method. The nanocomposite was characterized by transmission electron microscopy and X-ray diffraction spectroscopy. Incorporation of the prepared nanocomposite in a carbon paste electrode (CPE) increased the oxidation peak currents and reduced the overpotential of dopamine, melatonin and tryptophan. The new developed sensor was then employed for the simultaneous determination of target analytes with linear ranges of 0.010–3.0 μM, using differential pulse voltammetry. Detection limits of 0.0033, 0.0049 and 0.0041 μM were achieved for dopamine, melatonin and tryptophan, respectively. The selectivity of the method was studied and the results showed that the fabricated sensor is free from interference of organic compounds especially uric acid and ascorbic acid. Finally, the proposed electrochemical sensor was employed to determine analytes in urine, serum and pharmaceutical samples.