Preparation of AuNPs/GQDs/SiO₂ Composite and Its Catalytic Performance in Oxidation of Veratryl Alcohol

Table 2

Catalytic ability of AuNPs/GQDs/SiO₂ with respect to oxidation of veratryl alcohol.

Yield of veratraldehyde (%)	1st run	2nd run	3rd run	4th run	5th run
UV-vis	45.4; (±10.1)	84.0; (±7.14)	85.1; (±5.44)	83.3; (±7.39)	77.7; (±5.95)
HPLC	35.4	62.7	70.0	65.8	75.3

Reaction conditions: 2 μmol of veratryl alcohol, 20 μmol of hydrogen peroxide, 1 mL of deionized water, 2 mg of composite, and temperature of 50°C. The standard curve whose -coordinate is the conversion ratio and -coordinate is the UV absorbance is shown in Fig. S2b. Conversion ratios are the average values for three reaction runs. The peak area of the HPLC curve for a 2 mmol/L veratraldehyde solution (corresponding to 100% conversion) is 8584 mAU × S.