Environmental-friendly preparation method for nanometer nickel
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A nano-nickel and green technology, applied in the direction of nanotechnology, can solve the problems of hindering the effective progress of the reaction, immature production process, high production cost, etc., and achieve easy separation and collection, simple preparation method and process, and low production cost. Effect
Inactive Publication Date: 2018-07-24
ENERGY RES INST OF JIANGXI ACAD OF SCI
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The main mechanism of the thermal reduction of ethylene glycol to prepare nano-metal elements is that ethylene glycol decomposes at high temperature to form acetaldehyde, which has strong reducibility and can reduce metal ions to metal elements. At present, there are many studies on this method, but there is still Not applied to production, due to the immature production process, nano-nickel powder is difficult to separate from viscous polyols
Bai Liuyang et al. reported the preparation of metal nickel powder by ethanol reduction (Bai Liuyang, Li Shaohua, Yuan Fangli, et al. Preparation of metal nickel powder and nickel-coated composite powder by ethanol reduction [J]. 2008), but in the preparation process Among them, the nickel salt is insoluble in ethanol, which is not conducive to mass transfer and hinders the effective progress of the reaction. The resulting sodium acetate crystals are difficult to separate from the nano-nickel powder. The solvent is all ethanol, and the preparation cost is high.
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Embodiment 1
[0019] (1) Dissolve 0.004mol nickel sulfate pentahydrate in 25ml of water, stir to a homogeneous solution, add 25ml of ethanol, 25ml of NaOH solution with a concentration of 2.5mol / L, and stir for 1 hour.
[0020] (2) Transfer the mixed liquid and solid obtained above to a hydrothermal kettle, and in an oven for 170 O C for 36h and cooled to room temperature.
[0021] (3) The mixed liquid and solid in the reaction kettle are filtered to obtain filtrate and solid, and after the solid is washed with water and ethanol, 40 O C was vacuum dried for 24h to obtain nano nickel powder.
Embodiment 2
[0023] (1) Dissolve 0.003mol of nickel nitrate trihydrate in 25ml of water, stir to a homogeneous solution, add 15ml of ethanol and 15ml of 2.0mol / L NaOH solution, and stir for 2h.
[0024] (2) Transfer the mixed liquid and solid obtained above to a hydrothermal kettle, and in an oven at 190 O C for 20h and cooled to room temperature.
[0025] (3) The mixed liquid and solid in the reaction kettle are filtered to obtain filtrate and solid, and after the solid is washed with water and ethanol, 50 O C was vacuum dried for 24h to obtain nano nickel powder.
Embodiment 3
[0027] (1) Dissolve 0.002mol of nickel chloride in 25ml of water, stir to a homogeneous solution, add 15ml of ethanol and 10ml of 1.5mol / L NaOH solution, and stir for 2h.
[0028] (2) Transfer the mixed liquid and solid obtained above to a hydrothermal kettle, and in an oven for 210 O C for 16h and cooled to room temperature.
[0029] (3) The mixed liquid and solid in the reactor are filtered to obtain filtrate and solid, and after the solid is washed with water and ethanol, 30 O C was vacuum dried for 36h to obtain nano nickel powder.
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Abstract
The invention discloses an environmental-friendly preparation method for nanometer nickel. According to the method, a water-micromolecular alcohol hot method is used for carrying out preparation, andnanometer nickel powder is obtained. The environmental-friendly preparation method for the nanometer nickel comprises the following steps that firstly, soluble nickel salt serves as a raw material andis added into water to be stirred, a homogeneous solution is obtained, a certain amount of micromolecular alcohol is added, the mixture is stirred to be uniform, and under the stirring situation, alkali liquor is added, and stirring continues to be carried out; and secondly, the liquid and the solid obtained in the first step are transferred into a hydrothermal kettle, under the condition of 170DEG C-240 DEG C, after 6h-36h of hydrothermal treatment, the liquid and the solid are cooled to the room temperature, filtrate and black precipitate are obtained through filtering, the precipitate iswashed thoroughly through distilled water and ethyl alcohol and subjected to vacuum drying, and the nanometer nickel powder is obtained. According to the preparation method, the water-micromolecular alcohol hot method is used for carrying out preparation, the nanometer nickel powder is obtained, the raw materials are low in price and easy to obtain, and the using amount of the alcohol is small; according to the preparation method, it does not need to add a poisonous reducing agent, and environmental friendliness is achieved; and the product is easy to separate and collect, the preparation method and the technological process are simple, the industrial production is easy to achieve.
Description
technical field [0001] The invention relates to a green preparation method of nanometer nickel, and belongs to the technical field of nanometer material preparation. Background technique [0002] The production technology of ultrafine nickel powder belongs to the high-tech in the field of nanomaterial preparation. At present, the preparation methods of nanometer nickel powder mainly include vapor deposition method, electrolytic reduction method, hydrogen reduction method and liquid phase reduction method. Vapor deposition method refers to the preparation of nano-nickel powder by physical or chemical methods under controlled vacuum or reducing environmental conditions. This technology and process have high equipment requirements, high energy consumption and expensive production costs, making it difficult to achieve industrialized production; electrolytic reduction methods are obtained. The quality of the product is unstable, and the conditions are harsh and difficult to produ...
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