TiO2-Ti3C2Tx composite photocatalyst synthesized by Ti-based MOF in-situ derivation and application of TiO2-Ti3C2Tx composite photocatalyst
A composite photocatalyst technology, applied in physical/chemical process catalysts, hydrogen/synthesis gas production, inorganic chemistry, etc., can solve the problems of hindering photogenerated charge transfer, difficult large-scale application, and low activity of hydrogen production by photolysis of water
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Embodiment 1
[0035] Preparation of precursor Ti-based MOF
[0036] Add 3 mmol of titanium isopropoxide and 4.5 mmol of terephthalic acid (the molar ratio of titanium isopropoxide to terephthalic acid is 1:1.5), to a total volume of 200 mL of N,N-dimethylformamide (DMF) and methanol mixture (the volume ratio of DMF and methanol mixture is 9:1), then transfer it to a hydrothermal reaction kettle, put it in a blast drying oven, and conduct a hydrothermal reaction at 160°C for 16h . After cooling to room temperature, a white powder was obtained, which was washed several times with DMF and methanol, and then dried overnight at 60 °C in a blast drying oven to obtain a Ti-based MOF.
[0037] Since the precursor Ti-based MOF is a new material, its standard card has not been included in the PDF card library. Therefore, according to its crystal structure file, the XRD spectrum is simulated and calculated by Diamond software, as shown in figure 1 (d) shown. The XRD spectrum ( figure 1 (a)) and th...
Embodiment 2
[0039] Preparation of precursor Ti-based MOF
[0040] Similar to Example 1, except that the raw materials in Step 1 are 3 mmol of titanium isopropoxide and 5 mmol of terephthalic acid (the molar ratio of titanium isopropoxide to terephthalic acid is 1:1.7).
[0041] from figure 1 In (b), it can be seen that the XRD spectrum of the precursor Ti-based MOF prepared by step 1 of Example 2 and the XRD spectrum calculated by simulation ( figure 1 (d)) is consistent, indicating that Ti-based MOFs have been successfully prepared. Compared with the XRD spectrum diffraction peak intensity of the Ti-based MOF obtained in Example 1, the XRD spectrum diffraction peak intensity of the Ti-based MOF obtained in Example 2 is relatively weakened, which shows that with the molar concentration of titanium isopropoxide and terephthalic acid As the ratio gradually increases, the crystallinity of Ti-based MOF becomes relatively poor.
Embodiment 3
[0043] Similar to Example 1, except that the raw materials in step 1 are 3 mmol of titanium isopropoxide and 9 mmol of terephthalic acid (the molar ratio of titanium isopropoxide to terephthalic acid is 1:3).
[0044] from figure 1 It can be seen in (c) that the XRD spectrum of the precursor Ti-based MOF prepared by step 1 of Example 3 and the XRD spectrum calculated by simulation ( figure 1 (d)) is consistent, indicating that Ti-based MOFs have been successfully prepared. Compared with the XRD diffraction peak intensity of the Ti-based MOF obtained in Example 1 and Example 2, the XRD diffraction peak intensity of the Ti-based MOF obtained in Example 3 is the smallest, and the crystallinity is the worst at this time. These results clearly show that the crystallinity of Ti-based MOFs deteriorates with increasing molar ratio of titanium isopropoxide to terephthalic acid.
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