Shridevi Salagare,Prashanth Shivappa Adarakatti,Suma B P,Yarradoddappa Venkataramanappa
A nitrite sensing platform has been constructed using a TiO2-reduced graphene oxide (RGO) nanocomposite incorporated into a glassy carbon electrode. Reduced graphene oxide is integrated in a simple technique for the manufacture of titanium dioxide (TiO2). Spectroscopic and electrochemical techniques have all been used to characterise the TiO2- RGO nanocomposite. In 3 mM and pH 6.0 phosphate buffer solutions, the TiO2-reduced graphene oxide nanocomposites tailored glassy carbon electrode demonstrated outstanding electro-catalytic nitrite oxidation activity. The square root of scan rate is also proportional to the oxidation peak current, showing that the nitrite redox reaction involves a diffusion-controlled mechanism. Using linear sweep voltammetry, the sensitivity and detection limit for nitrite at the modified electrode were determined to be 4.853 μA/μM cm2 and 0.006 µM respectively, over a concentration range of 10 - 2000 µM. Further, the nanocomposite is used to measure NO2- in water and buttermilk samples quantitatively.
Kun Jiang,Jin Zhang,Yingfei Wan,Zengjian Liu,Jinwei Chen
In order to obtain the advanced photocatalyst with high performance for removing the gaseous formaldehyde, a new strategy with amination of titanium dioxide (TiO 2 ) and combination with reduced graphene oxide (rGO) is proposed in this work. TiO 2 was first aminated into amino-TiO 2 and then combined with rGO by an electrostatic self-assembly process to form the amino-TiO 2 /rGO photocatalysts. The structure and morphology were characterized by XRD , FTIR, and SEM, respectively. Physicochemical properties were measured by EIS, XPS , ESR , PL , and photocurrent measurements. The mechanism of the photocatalytic reaction was studied. Optimal amino-TiO 2 /rGO catalyst exhibits high catalytic activity and recyclability. The reaction rate constant of HCHO over this catalyst is approximately 9.8 × 10 −3 L mol −1 ·min −1 , which is 10.5 times higher than that of the commercial Degussa P25 TiO 2 . The analysis results from XPS and ESR indicates that the high catalytic activity could be mainly attributed to the imine formed by chemisorption of amino and HCHO. The reaction speed of formaldehyde photolysis increases as the concentration of HCHO on the photocatalyst surface increased. In addition, the introduction of graphene enhances carrier separation efficiency so that leads to more reactive radicals such as hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ), leading to improved performance on formaldehyde photolysis. This could provide a useful method for highly efficient formaldehyde photocatalysis .
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