Preparation of composite photocatalyst and method for degrading heavy metals by using composite photocatalyst
A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc.
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Embodiment 1
[0032] Embodiment 1: Diffuse reflection of different ratio catalysts
[0033] The optical properties of the catalyst FeOCN-x were studied by UV-Vis diffuse reflectance spectroscopy. Such as figure 1 As shown, pure g-C 3 N 4 There are two distinct absorptions at 312 nm in the UV range and 403 nm in the visible range. while Fe 3 o 4 There is a broad and strong absorption peak in the range of 250 nm-700 nm. When Fe 3 o 4 and C 3 N 4 When combined, FeOCN-x exhibits enhanced absorption at 312 nm in the ultraviolet range and 403 nm in the visible range. More importantly, Fe 3 o 4 Load to g-C 3 N 4 A new absorption band appears at 450-600 nm. With Fe 3 o 4 When the mass ratio of FeOCN-x (2%-10%) gradually increases, the intensity of the new absorption band generated by FeOCN-x also increases. This shows that the composite photocatalyst FeOCN-x is more effective than pure g-C 3 N 4 Possibly better visible light activity.
[0034] Wherein, when the above-mentione...
Embodiment 2
[0040] Example 2: Adsorption experiments of different proportions of photocatalysts during dark treatment
[0041] In five glass reactors, 17 mL of 20 mg / L heavy metal ion Pb(II) solution was firstly added, and then 17 mg of FeOCN-2, FeOCN-4, FeOCN-6, FeOCN-8, FeOCN-10 catalysts were added respectively. The reactor mouth was sealed, and argon or nitrogen gas was introduced for 20 minutes to make the reaction proceed under anaerobic conditions; magnetic stirring was used to mix the Pb(II) solution and the catalyst evenly to achieve adsorption-desorption equilibrium, and the reaction was stirred for 10 hours in the dark. From figure 2 It can be seen that after the catalyst FeOCN-x is stirred in the dark for 10 h, its adsorption effect on Pb(II) is basically similar, and can be maintained above 40%, among which FeOCN-4 has the largest adsorption effect.
Embodiment 3
[0042] Embodiment 3: Degradation experiments of different proportions of photocatalysts under light treatment
[0043] In five glass reactors, 17 mL of 20 mg / L heavy metal ion Pb(II) solution was firstly added, and then 17 mg of FeOCN-2, FeOCN-4, FeOCN-6, FeOCN-8, FeOCN-10 catalysts were added respectively. The reactor mouth is sealed, and argon or nitrogen gas is introduced for 20 minutes to make the reaction proceed under anaerobic conditions; magnetic stirring makes the Pb(II) solution and the catalyst mix uniformly respectively to achieve adsorption and desorption equilibrium. The artificial light source used is a 500W xenon lamp. 420nm cut-off filter, turn on the light source, and irradiate with visible light for 10h. After 10 h of visible light irradiation, Pb(II) was basically degraded by more than 50%, because the composite catalyst FeOCN-x produced a new absorption peak at 450-600 nm and was loaded with Fe 3 o 4 Finally, the transfer rate of photogenerated electrons...
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