A method of polydopamine composite nonwoven fabric strengthening iron activated persulfate degradation dye
A technology for activating persulfate and non-woven fabrics, applied in the field of water pollution control, can solve the problems of reducing the efficiency of free radicals to oxidize pollutants, achieve the effect of improving activation efficiency and reducing consumption
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[0031] (1) The preparation method of polydopamine composite nonwoven fabric (PDA@PP) comprises the following steps:
[0032] 1) Prepare 0.01mol / L Tris(hydroxymethyl)aminomethane hydrochloride solution (Tris solution), adjust the pH of the solution to 8.5 with NaOH, and prepare it as a buffer solution; dissolve dopamine in the prepared buffer solution, adjust Become the polydopamine solution that concentration is 2g / L.
[0033] 2) Weigh a certain mass of untreated nonwoven fabric, arrange the nonwoven fabric in a 2g / L dopamine solution, shake it at room temperature for 24 hours, and react and compound to prepare a polydopamine composite nonwoven fabric.
[0034] 3) Repeatedly wash with distilled water to remove uncomposited polydopamine on the surface of the polydopamine composite nonwoven fabric, and then place it in a 60°C oven for drying to constant weight to obtain a polydopamine composite nonwoven fabric (PDA@PP) sample.
[0035] (2) Regulation of dye wastewater
[0036]...
Embodiment 1
[0051] Add 2.5ml, 80mmol / LPS; 1ml, 100mM FeCl 3 solution; the load is 4% of 0.05g PDA@PP and 0.7mmol / L Acid Red B, and the ARB absorbance corresponding to the solution is measured, and the ARB degradation results are as follows figure 1 Shown PDA@PP / Fe 3+ / PS / ARB curve; the result of PS consumption is as follows figure 2 Shown PDA@PP / Fe 3+ / PS / ARB curve.
Embodiment 2
[0053] Add 2.5ml, 80mmol / LPS; 0.028gFeSO 4 ·7H 2 O; the load is 4% of 0.05g PDA@PP and 0.7mmol / L Acid Red B, measure the corresponding ARB absorbance of the solution, and the ARB degradation results are as follows figure 1 Shown PDA@PP / Fe 2+ / PS / ARB curve; the result of PS consumption is as follows figure 2 Shown PDA@PP / Fe 2+ / PS / ARB curve.
[0054] like figure 1 As shown, in the separate PS and PDA@PP / PS system, the degradation effect on ARB has little change, almost no; Fe 3+ / PS and PDA@PP / Fe 3+ The degradation rates of ARB in / PS system were 45.6% and 50.5% respectively; Fe 2+ / PS and PDA@PP / Fe 2+ The degradation rates of ARB by the / PS system were 80.9% and 85.7%, indicating that the addition of PDA@PP promoted the Fe 3+ / PS or Fe 2 + Oxidative degradation of the dye ARB by / PS. in Fe 3+ After adding PDA@PP to the / PS system, the degradation rate of ARB increased, which further indicated that the addition of PDA@PP improved the catalytic activity.
[0055] ...
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