TiO2-doped LTA zeolite as a sensitive non-enzymatic electrochemical sensor toward hydrogen peroxide detection

Abstract

Hydrogen peroxide (H2O2) is widely developed in various fields such as industry, biochemistry, and the environment. A titanium dioxide-doped Linde Type-A (TiO2 LTA) zeolite has been hydrothermally prepared and used as an electrochemical catalyst for the detection of H2O2. The morphology and structure of the TiO2 LTA zeolite were analyzed through a series of characterization tests. Results indicated that the TiO2 was partly and highly dispersed on the zeolitic surface, which improved the catalytic site. Moreover, the zeolite showed good adsorption and adsorbed more H2O2 molecules, improving the sensitivity of detection· H2O2 was measured accurately through the square wave voltammetry (SWV) by the TiO2-doped LTA modified electrode (TiO2 LTA/GCE). The electrode had the characteristics of a wide detection range, good stability, and good repeatability, with a detection limit (LOD) of 10 nM, linear range of 78.0 nM-19.9 μM and 96.6–3848.8 μM. In addition, the sensor has been successfully used for analysis in tap water and cell fluid, which has the potential to become a candidate material for environmental and biological sensing applications.