Stable easy-separation nanoscale iron ball, preparation method thereof and application thereof
An easy-to-separate, nano-zero-valent iron technology, which is applied in the field of pollution sludge and water environment treatment, can solve the problems of poor NZVI stability, waste of financial and material resources, and costly manpower and material resources, so as to avoid agglomeration, overcome easy oxidation and Difficult to separate and improve utilization efficiency
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Example
[0030] Example 1:
[0031] (1) Preparation of cross-linking precursor solution: Add appropriate amount of glacial acetic acid to anaerobic deionized water, and then add chitosan under constant heating and stirring conditions. After chitosan is completely dissolved, continue heating and stirring for 3 hours. Cool to room temperature. In the aforementioned crosslinking precursor solution, the volume fraction of acetic acid is 1%, and the mass / volume percentage content of the chitosan-acetic acid solution is 2%;
[0032] (2) Preparation of nano-iron dispersion solution: use deionized water as a solvent, adjust its pH to 6, then add Tween20, nano-iron powder and 10 mesh iron scraps, and use ultrasonic to disperse the powder for 10 minutes. The dispersed solution of nano iron is obtained. In the above dispersion solution, the mass percentage content of Tween20 is 0.5%; the mass percentage content of the nano zero-valent iron powder is 30%; the mass percentage content of the iron scra...
Example Embodiment
[0035] Example 2:
[0036] (1) Preparation of cross-linking precursor solution: Add an appropriate amount of glacial acetic acid to anaerobic deionized water, and then add chitosan under constant heating and stirring conditions. After the chitosan is completely dissolved, continue heating and stirring for 4 hours. Cool to room temperature. In the aforementioned crosslinking precursor solution, the volume fraction of acetic acid is 2%, and the mass / volume percentage content of the chitosan-acetic acid solution is 4%;
[0037] (2) Preparation of nano-iron dispersion solution: use deionized water as the solvent, adjust its pH to 7, then add Tween20, nano-iron powder and 30 mesh iron scraps, and use ultrasonic to disperse the powder for 30 minutes. The dispersed solution of nano iron is obtained. In the above dispersion solution, the mass percentage content of Tween20 is 1%; the mass percentage content of the nano zero-valent iron powder is 40%; the mass percentage content of the ir...
Example Embodiment
[0039] Example 3:
[0040] (1) Preparation of cross-linking precursor solution: add an appropriate amount of glacial acetic acid to anaerobic deionized water, add chitosan under continuous heating and stirring conditions, and continue heating and stirring for 5 hours after the chitosan is completely dissolved. Cool to room temperature. In the above-mentioned crosslinking precursor solution, the volume fraction of acetic acid is 4%, and the mass / volume percentage content of the chitosan-acetic acid solution is 6%;
[0041] (2) Preparation of nano-iron dispersion solution: use deionized water as a solvent, adjust its pH to 7, then add Tween20, nano-iron powder and 50 mesh iron scraps, and use ultrasonic to disperse the powder for 30 minutes. The dispersed solution of nano iron is obtained. In the above dispersion solution, the mass percentage content of Tween20 is 3%; the mass percentage content of the nano zero-valent iron powder is 50%; the mass percentage content of the iron sc...
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