Magnetic Fenton-like catalyst based on chitosan as well as preparation method and application of magnetic Fenton-like catalyst
A chitosan and catalyst technology, applied in the field of magnetic catalyst preparation, can solve problems such as unfavorable activation, reduced catalytic efficiency, metal loss, etc., and achieve the effect of promoting electron transmission, inhibiting metal loss, and mild preparation process
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Embodiment example 1
[0032] Weigh 1g of chitosan, fully dissolve it in 40mL 0.25wt% acetic acid solution, then add 0.001mol manganese nitrate, 0.2mol ferric nitrate and 0.1mol ferrous nitrate in turn, keep magnetic stirring until fully dissolved to obtain a uniformly dispersed salt solution A . Weigh 0.01mol sodium hydroxide and 0.01mol sodium acetate dissolved in 100mL deionized water to form alkaline solution B. Salt solution A was added dropwise to alkaline solution B at a constant speed of 3 mL / min. After the dropwise addition, the obtained mixed solution was placed in a constant temperature oscillator at 20°C for 3 hours and aged to obtain the following formula: figure 2 (A) CH-Mn-Fe gel beads shown. The CH-Mn-Fe gel beads were washed to neutrality and freeze-dried for 6 h to obtain magnetic microspheres MnO with a porous structure 2 -Fe 3 o 4 / CH composite catalyst, such as figure 2 Shown in (B), the catalyst particle size is 2-4mm.
[0033] Detected by wide-angle XRD ( image 3 ), ...
Embodiment example 2
[0036] Weigh 1g chitosan, fully dissolve it in 40mL 1.0wt% acetic acid solution, then add 0.005mol manganese sulfate, 0.025mol ferric nitrate and 0.0125mol ferrous nitrate in turn, keep magnetic stirring until fully dissolved to obtain uniformly dispersed salt solution A . Weigh 0.05 mol of sodium hydroxide and 0.05 mol of sodium acetate dissolved in 100 mL of deionized water to form alkaline solution B. The salt solution A was added dropwise to the alkaline solution B at a constant rate of 5 mL / min. After the dropwise addition, the obtained mixed solution was placed in a constant temperature oscillator at 40°C for 8 hours of shaking and aging to obtain CH-Mn-Fe gel beads. The CH-Mn-Fe gel beads were washed to neutrality and freeze-dried for 12 h to obtain magnetic microspheres MnO with a porous structure 2 -Fe 3 o 4 / CH composite catalyst.
[0037] Measure 100mL of 50 mg / L methylene blue solution in a conical flask, add 0.05mol H 2 o 2 and 2.0g of the above-mentioned pr...
Embodiment example 3
[0039] Weigh 1g of chitosan, fully dissolve it in 40mL 2.0wt% acetic acid solution, then add 0.01mol manganese chloride, 0.02mol ferric chloride and 0.01mol ferrous chloride in turn, keep magnetic stirring until fully dissolved to obtain evenly dispersed Salt solution A. Weigh 0.1 mol of sodium hydroxide and 0.1 mol of sodium acetate dissolved in 100 mL of deionized water to form alkaline solution B. Salt solution A was added dropwise to alkaline solution B at a constant rate of 7 mL / min. After the dropwise addition, the resulting mixed solution was placed in a constant temperature oscillator at 50°C for 12 hours of aging to obtain CH-Mn-Fe gel beads. The CH-Mn-Fe gel beads were washed to neutrality and freeze-dried for 16 h to obtain magnetic microspheres MnO with a porous structure 2 -Fe 3 o 4 / CH composite catalyst.
[0040] Measure 100mL of 100 mg / L methylene blue solution in a conical flask, add 0.1mol H 2 o 2 and 3.0g of the above-mentioned prepared magnetic micros...
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