Nanometer zero-valent iron particle capable of stably existing in air, and preparation method thereof
A nano-zero-valent iron and nano-iron technology, which is applied in the nano field, can solve the problems that the stable existence of oxidation cannot be completely prevented, the preparation process is cumbersome, and there are no research reports, and the effects of good market prospects, simple process and simple equipment can be achieved.
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Embodiment 1
[0031] A nanometer zero-valent iron particle that can exist stably in the air, the nanometer zerovalent iron particle is based on the nanometer zerovalent iron particle, and its surface is coated with nanometer chitosan particles. Its preparation method comprises the following steps:
[0032] (1). Preparation of chitosan nitric acid solution:
[0033] Dissolve chitosan with a molecular weight of 100,000 in 0.05mol / L HNO 3 In solution, obtain the chitosan nitric acid solution that mass percent composition is 0.5%;
[0034] (2). Deoxygenation:
[0035] Add 10ml of FeSO containing 0.2978g to 3ml of the above chitosan nitric acid solution 4 ·7H 2 O aqueous solution, so that the molar concentration of iron ions is 0.082mol / L, then pass through nitrogen to remove oxygen for 30 minutes, and then mechanically stir for 10 minutes to make the mixing uniform and sufficient to obtain a mixed solution;
[0036] (3). Preparation of nano-iron solution:
[0037] Add 10ml of 0.535mol / L f...
Embodiment 2
[0041] When preparing the black nano-iron solution, the reactant uses NaBH 4 Solution Replacement KBH 4 solution, and others are the same as in Example 1.
Embodiment 3
[0043] A nanometer zero-valent iron particle that can exist stably in the air, the nanometer zerovalent iron particle is based on the nanometer zerovalent iron particle, and its surface is coated with nanometer chitosan particles. Its preparation method comprises the following steps:
[0044] (1). Preparation of chitosan nitric acid solution:
[0045] Dissolve chitosan with a molecular weight of 50000 in 0.05mol / L HNO 3 In solution, obtain the chitosan nitric acid solution that mass percentage composition is 0.3%;
[0046] (2). Deoxygenation:
[0047] Add 10ml of FeSO containing 0.1489g to 3ml of the above chitosan nitric acid solution 4 ·7H 2 O aqueous solution, so that the molar concentration of iron ions is 0.041mol / L, then pass through nitrogen to remove oxygen for 20 minutes, and then mechanically stir for 10 minutes to make the mixing uniform and sufficient to obtain a mixed solution;
[0048] (3). Preparation of nano-iron solution:
[0049] Add 8ml of 0.535mol / L f...
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