Application of coacervate system in selective photocatalytic degradation of environmental pollutants
A technology of coacervation and photocatalysis, applied in the field of environmental pollution control, can solve the problems of complicated procedures and cumbersome catalyst preparation process, and achieve the effect of simple application process, easy operation and broad application prospects.
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Embodiment 1
[0046] In order to investigate the selective photocatalytic decomposition of environmental pollutants in the coacervate phase, two dyes RhB and MB were used as model pollutants to carry out mixed degradation experiments. Into a 15 ml glass reaction vial containing 4 mg of titanium dioxide photocatalyst, transfer 6 ml of PDDA solution with a concentration of 50 mM, and ultrasonicate for 5 minutes to fully disperse the catalyst in the solution. Under magnetic stirring, add 100 μL RhB solution (5g·L -1 ) and 100μL MB solution (5g·L -1 ), mix thoroughly, and finally add 2 mL of ATP solution with a concentration of 50 mM. Turn on the light source and carry out the photocatalytic degradation of the model pollutants under continuous stirring. Take 800 μL of samples at different time points of light in a 2 mL plastic centrifuge tube, add 10 μL of 5M sodium chloride solution to decompose the coacervate, shake well to obtain a homogeneous solution, centrifuge the catalyst, and take th...
Embodiment 2
[0050] In order to prove that the preferential photocatalytic degradation of MB in coacervate phase is caused by the presence of coacervate, we carried out their photocatalytic degradation in aqueous solution as a control. Transfer 8 ml of distilled water into a 15 ml glass reaction bottle containing 4 mg of titanium dioxide photocatalyst, and disperse fully by ultrasonication for 5 minutes. Under magnetic stirring, add 100 μL RhB solution (5g·L -1 ) and 100μL MB solution (5g·L -1 ) to mix thoroughly. Turn on the light source for photocatalytic degradation of model pollutants. 800 μL of samples were taken at different time points of the light in a 2 mL plastic centrifuge tube, the catalyst was separated by centrifugation, and the supernatant was taken for visible-ultraviolet spectroscopic analysis. The degradation spectrum of mixed dyes in aqueous solution is shown in Figure 5 a. It can be seen that the characteristic absorption peaks of RhB and MB decreased significantl...
Embodiment 3
[0052] Embodiment 3 (comparative example):
[0053] In order to study the selective photocatalytic degradation of model pollutants in coacervate phase, mixed dyes MB and X3B were selected as model pollutants. Except that RhB is replaced by X3B, other conditions are the same as in Example 1. The first-order kinetics fitting curve of photocatalytic degradation of mixed dyes in coacervate solution, see Image 6 . The degradation rate constants of X3B and MB in the coacervate phase are 0.015min, respectively -1 and 0.010min -1 , the selectivity β of X3B to the photocatalytic degradation of MB in the coacervate system X3B / MB =0.015 / 0.010=1.5, indicating that X3B and MB degrade in the coacervate system, and the selectivity is not obvious, which may be related to the fact that these two dyes are easy to enter the coacervate (Table 1).
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