Application of co(salen) catalytic paper in lignin oxidation
A technology of catalytic oxidation and catalytic paper, which is applied in the direction of oxidized water/sewage treatment, physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, etc., to improve lignin degradation rate, easy process implementation, and catalytic high potency effect
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Embodiment 1
[0016] Embodiment 1: Co (salen) catalytic paper is applied in lignin oxidation, and concrete operation is as follows:
[0017] (1) Preparation of the cobalt complex Co(salen) of bis-salicylaldehyde ethylenediamine acetal
[0018] A. Synthesis of Salen
[0019] Dissolve 2.5g of ethylenediamine and 8.5mL of salicylaldehyde in 18mL of methanol, stir in an ice-water bath for 30min, let stand for 15min, filter under reduced pressure, wash with 1mL of ether, and dry at 33°C for 6h to obtain 10.7g of The yellow solid was recrystallized with 160 mL of absolute ethanol, and dried at 33°C for 18 hours to obtain 9.4 g of bright yellow flaky crystals, namely Schiff base salen, with a yield of 88.0% and a melting point of 125-125.5°C.
[0020] , Co(salen) synthesis
[0021] Get 1.3mmoL of the product Schiff base salen that last step obtains and dissolve in 15mL methanol, the gained solution is mixed with 3mmoL metal salt CoAc 2 • 4H 2 O was mixed, refluxed for 1 h, cooled, filtered, an...
Embodiment 2
[0026] Embodiment 2: Co (salen) catalytic paper is applied in lignin oxidation, and concrete operation is as follows:
[0027] (1) The synthetic method of Co(salen) catalytic paper is the same as that of Example 1 (1), (2);
[0028] (2) Co(salen) catalytic paper catalyzes the method of oxidizing lignin
[0029] In Co(salen) catalytic paper, H 2 o 2 Under the condition of presence, the lignin is subjected to catalytic oxidation treatment; for lignin catalytic oxidation treatment, water 40mL, lignin 0.7g, the treatment temperature is controlled at 50°C, and the time is 2h; for lignin catalytic oxidation treatment, also add Catalyst Co(salen) catalytic paper was added, and the amount of Co(salen) catalytic paper was 0.02g; when the lignin was catalytically oxidized, the oxidizing agent H was also added. 2 o 2 , the mass percentage concentration is 30% H 2 o 2 Solution 0.5mL; lignin degradation rate is 30% higher than traditional Co(salen) powder catalytic effect; hydrogen p...
Embodiment 3
[0030] Embodiment 3: Co (salen) catalytic paper is applied in lignin oxidation, and concrete operation is as follows:
[0031] (3) The synthesis method of Co(salen) catalytic paper is the same as the steps (1) and (2) of Example 1;
[0032] (4) Co(salen) catalytic paper catalyzes the method of oxidizing lignin
[0033] In Co(salen) catalytic paper, H 2 o 2 Under the condition of existence, carry out catalytic oxidation treatment to lignin; For lignin catalytic oxidation treatment, water 50mL, lignin 1g, the temperature of treatment is controlled at 80 ℃, time 3h; For lignin catalytic oxidation treatment, also add Catalyst Co(salen) catalytic paper, the amount of Co(salen) catalytic paper is 0.03g; when the lignin is catalytically oxidized, the oxidant H is also added 2 o 2 , the mass percentage concentration is 30% H 2 o 2 The solution is 0.7mL; the lignin degradation rate is 21% higher than the catalytic effect of traditional Co(salen) powder; the hydrogen peroxide cons...
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