A process for preparing modified SDS nanometer zero-valent iron
A nano-zero-valent iron, process technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of cell membrane structure damage, extravasation of cell inclusions, etc., to reduce dosage good leaching effect, avoiding the damage of soil structure
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Embodiment 1
[0030] Table 1 List of main reagents
[0031]
[0032] 1. Preparation of zero-valent iron
[0033] At room temperature, add FeSO with a concentration of 0.07mol / L into a 500mL three-necked flask 4 ·7H 2 O solution (30% absolute ethanol + 70% ultrapure water), and then in BH 4 - / Fe 2+ Under the condition of molar ratio of 2.0, to the solution with 2d·s -1 Add NaBH dropwise at a rate of 4 The solution was stirred rapidly with a mechanical stirrer, and the whole process was carried out under N 2 under protected conditions.
[0034] The basic principle of the reaction is:
[0035] Fe 2+ +2BH 4 - +6H 2 O → Fe 0 ↓+2B(OH) 3 +7H 2 ↑
[0036] NaBH 4 After finishing all the dropwise addition, continue to stir for 20 min until no bubbles are generated in the solution. After the reaction, the solution was centrifuged several times, and the supernatant was removed. The obtained black solid was washed with ethanol several times, then vacuum-dried, and placed in a place...
Embodiment 2
[0042] Preparation of modified SDS nanometer zero-valent iron
[0043] Group 1. Pseudomonas aeruginosa was cultured to a concentration of 1 × 10 according to conventional methods. 9 cfu / ml bacterial solution;
[0044] Spray the bacterial solution on the SDS nano-zero-valent iron, the ratio of the bacterial solution to the SDS nano-zero-valent iron is 1L: 4kg, stir evenly, and store at 4°C.
[0045] Group 2. Aspergillus niger was cultivated according to conventional methods to a concentration of 1×10 9 cfu / ml bacterial solution;
[0046] Spray the bacterial solution on the SDS nano-zero-valent iron, the ratio of the bacterial solution to the SDS nano-zero-valent iron is 1L: 4kg, stir evenly, and store at 4°C.
[0047] Group 3. Acinetobacter baumannii was cultivated to a concentration of 1×10 according to conventional methods. 9 cfu / ml bacterial solution;
[0048] Spray the bacterial solution on the SDS nano-zero-valent iron, the ratio of the bacterial solution to the SDS n...
Embodiment 3
[0060] Study on the leaching toxicity of heavy metals stabilized by different nanometer zero-valent iron.
[0061] In practical applications, the stability of materials in the soil plays a decisive role in the remediation effect, so only materials with good stability in the soil environment can be put into practical applications; this study selects representative actual polluted soil as the research Object, to verify the stability of nano-zero-valent iron.
[0062] Table 2 The physical and chemical properties and heavy metal content of the tested soil
[0063]
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