A kind of lignin-based aerogel for degrading anionic dyes by visible light and preparation method thereof
An anionic dye and lignin-based technology, which is applied in the field of lignin-based aerogels and its preparation for visible light degradation of anionic dyes, to achieve the effect of not reducing the efficiency
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Embodiment 1
[0026] In this embodiment, a lignin-based aerogel for preparing visible light-degradable anionic dyes from raw materials is prepared by the following method, including the following steps:
[0027] (1) Cationic modification of lignin: at 60 °C, put 20 g of alkali lignin into 300 mL of a cationic modifier solution with a concentration of 1% for reaction, and adjust the pH of the solution to 10 with sodium hydroxide, and the reaction time For 75min, after the reaction, washing and drying; the molecular structure of the cationic modifier is as follows:
[0028]
[0029] Wherein, a is 20-50, b is a is 20-50, and the weight-average molecular weight of the modifier is 5,000-20,000.
[0030] (2) Preparation of lignin-based aerogel: 10 g of alkali lignin treated in step (1) was placed in a mixed aqueous solution composed of 75 mL of sodium oxyhydroxide, urea and water, and the mixed aqueous solution contained 0.1 mol of oxysodium oxide and 0.2 mol of urea Then stir and dissolve at...
Embodiment 2
[0034] In this embodiment, a lignin-based aerogel for preparing visible light-degradable anionic dyes from raw materials is prepared by the following method, including the following steps:
[0035] (1) Cationic modification of lignin: at 60 °C, put 30 g of alkali lignin into 300 mL of a cationic modifier solution with a concentration of 0.5% for reaction, and adjust the pH of the solution with sodium hydroxide to 9, and the reaction time 70min, after the reaction, washing and drying; the molecular structure of the cationic modifier is shown in Example 1.
[0036] (2) Preparation of lignin-based aerogel: 10 g of alkali lignin treated in step (1) was placed in a mixed aqueous solution composed of 50 mL of sodium oxyhydroxide, urea and water, and the mixed aqueous solution contained 0.1 mol of oxysodium oxide and 0.1 mol of urea Then stir and dissolve at room temperature to obtain lignin solution; add 0.5g N,N-methylenebisacrylamide as a cross-linking agent in the lignin solution...
Embodiment 3
[0040] In this embodiment, a lignin-based aerogel for preparing visible light-degradable anionic dyes from raw materials is prepared by the following method, including the following steps:
[0041] (1) Cationic modification of lignin: at 60 °C, put 15 g of alkali lignin into 300 mL of a cationic modifier solution with a concentration of 2%, and adjust the pH of the solution to 11 with sodium hydroxide. The reaction time 80min, after the reaction, washing and drying; the molecular structure of the cationic modifier is shown in Example 1.
[0042] (2) Preparation of lignin-based aerogels: 10 g of alkali lignin treated in step (1) was placed in a mixed aqueous solution composed of 100 mL of sodium oxyhydroxide, urea and water, and the mixed aqueous solution contained 0.1 mol of sodium oxyhydrogen and 0.3 mol of urea ; Then stir and dissolve at room temperature to obtain a lignin solution; add 1 g of N,N-methylenebisacrylamide as a cross-linking agent to the lignin solution, stir ...
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