earticle

영어

In this study, novel nanozymes, CNF/FeNCDs and CNF/PdNPs were prepared by synthesis of carbon dot and Pb nanoparticles on cellulose nanofibril (CNF), and their applications with its peroxidase activity and dye degradation were evaluated. For preparation of CNF/FeNCDs, Periodate oxidation of cellulose nanofibrils (CNF) is performed to produce dialdehyde functions. In a typical reaction, 100 g of 0.5% CNF is reacted with 500 mg sodium periodate at 45 °C temperature for 4 hours under dark conditions. As produced DACNF have an aldehyde content of 1.25 mM/g and yield was above 90%. Fe, N-doped carbon dots (FeNCDs) were prepared by a hydrothermal reaction of citric acid, FeCl2.4H2O and ethylene diamine, and then bound to dialdehyde cellulose nanofibrils via Schiff base reaction. Pd nanoparticles (PdNPs) on CNF were prepared by a rapid microwave. Subsequent reduction of Pd2+ ions was achieved using ethylene glycol (EG) as reducing agent under microwave irradiation. Effect of EG amount and microwave irradiation time was also studied. Comparative experiments under conventional heating revealed that 2 h of time is required for complete reduction whereas the microwave irradiation offered in just 120 s. It was observed that the FeNCD and PdNPs having a diameter of 5-10 nm were synthesis on CNFs. Binding of FeNCDs and PdNPs on CNF was confiremd by X-ray photoelectron spectroscopic analysis. X-ray diffraction patterns unveiled the face centered cubic (FCC) crystal structure of PdNPs. Peroxidase activity of CNF/FeNCDs and CNF/PdNPs was studied by catalyzing the H2O2 mediated oxidation of 2,2’-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS). The excellent peroxidase activity of both nanozymes was demonstrated through UV-vis spectra analysis of Ox-ABTS. By detecting the hydrogen peroxide formed by the cholesterol oxidase with the nanozymes, the cholesterol detection ability of the nanozymes was verified.