Synthesis method of carbon quantum dot/ZnO composite photocatalyst
A technology of carbon quantum dots and synthesis methods, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the limitation of ZnO application and the reduction of ZnO photocatalytic efficiency problem, to achieve the effect of resource utilization, broadening the light response range, and improving dispersion.
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Embodiment 1
[0032] Weigh 25 mg of air-dried sugarcane husk in 40 mL of distilled water, and ultrasonically crush for 60 minutes to obtain a clear solution;
[0033] All the above clarified solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene (volume filling rate was 80%), and the autoclave was placed in an oven at 200°C for 4 hours, and after being naturally cooled to room temperature, filtered to obtain The solution is transferred to the dialysis bag and dialyzed for 48h to obtain the carbon quantum dot solution;
[0034] Accurately weigh 2.000g of 2-methylimidazole in 90mL of distilled water, stir magnetically to obtain a uniform solution, and add 10mL of 75mg·mL dropwise to it -1 Zn(NO 3 ) 2 ·6H 2 O aqueous solution, magnetically stirred for 10 min, then ultrasonicated for 1 h, centrifuged the ultrasonicated solution, washed with anhydrous methanol for more than 5 times, and dried the collected solid in an oven at 70°C for 8 h to obtain ZIF-8; ...
Embodiment 2-33
[0041] Using the amount of carbon quantum dot solution in Table 1 and other experimental conditions, the carbon quantum dot / ZnO composite photocatalyst was prepared according to the preparation process described in Example 1.
[0042] Table 1. Comparison of various experimental conditions and photocatalytic degradation RhB performance in Examples 2-33
[0043]
[0044]
[0045] According to the experimental data in Table 1, it can be seen that:
[0046] (1) When the amount of air-dried sugarcane husk is low (such as 25mg), the solvothermal time is short (such as 4h), and the carbon quantum dot solution can be synthesized, and with a lower concentration of Zn(NO 3 ) 2 ·6H 2 O solution (50mg·mL -1 ) compound, the obtained carbon quantum dot / ZnO composite photocatalyst, the photocatalytic RhB degradation rate is not lower than 95%.
[0047] (2) When the amount of air-dried sugarcane husk is large (such as 200mg), a longer solvothermal time (such as 8h) is required, and ...
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