Simultaneous and sensitive determination of benzenediol isomers using Zn-MOF modified carbon paste electrode by voltammetric method

محمد حسين مشهدي زاده اردكاني¹ سيده مرضيه كلانتريان² افسانه آژده³

1) استاد تمام شيمي گرايش تجزيه دانشگاه خوارزمي تهران
2) دانشجوي كارشناسي ارشد شيمي گرايش تجزيه دانشگاه خوارزمي تهران
3) دانشجوي دكتري شيمي گرايش تجزيه دانشگاه خوارزمي تهران

Publication : 13th Biennial Electrochemistry Seminar of Iran(elect13pguac.ir)
Abstract :
Hydroquinone (HQ), catechol (CT), and resorcinol (RC) are dihydroxybenzene isomers that are widespread in nature. Dihydroxybenze isomers are used extensively in the manufacture of various products (e.g. plastics, dyes, synthetic rubber, and household detergents) and can easily permeate into waterways. Furthermore these are carcinogenic, and also can interfere with the endocrine system, even in trace levels. Thus, it is necessary to monitor or quantify these pollutants in complex systems [1]. Simultaneous determination of dihydroxybenzene isomers has become one of the important subjects for environmental analysis because they have similar structures and properties and coexistence in environmental samples. The electrochemical performance of carbon paste working electrode toward oxidation of isomers was improved by being modified by using Metal-Organic Framework for simultaneous determination of CT, HQ, and RC by voltammetric method. Metal−organic frameworks (MOFs), as a novel class of crystalline porous materials, are fabricated of inorganic metal ions/clusters linked by appropriate organic ligands, their unique characteristics such as highest surfaces area and adsorption affinity, adequate mechanical resistance, and thermal stability. The assembly of MOFs has drawn significant attention due to their fascinating structures and numerous potential applications in fluorescence, drug delivery, gas storage/separation, chemical sensing, magnetism, catalysis, pollutant control, antibacterial materials, and etc. [2]. MOFs have attracted much attention for applications in electrochemical sensors, because of their unique chemical and physical properties including ultrahigh porosity, large surface area, tunable structure, and high thermal and chemical stability. In this work, we have developed an electrochemical sensor using a carbon paste electrode modified by Zn-MOF for the simultaneous detection of HQ, CC, and RC dihydroxybenzene isomers. A good separation between the HQ, CC, and RC peaks allows us to simultaneously measure the dihydroxybenzene isomers using the differential pulse voltammetric (DPV) or cyclic voltammetric (CV) techniques. The proposed sensor delivered a linear dynamic range for HQ 10-7 – 10-3 μM, CT 10-7 -10-3 M, and RC 10-7-10-3 μM with the detection limit of 0.3 pM Thus we dicided fabricate a sensor modified by synthesized MOF in order to measuring this isomers Simultaneously
Keywords : metal organic framework Simultaneous benzenediol isomers