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A method for controllable preparation of iron oxide powder by using cattail velvet
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A technology of iron oxide powder and cattail velvet, which is applied in the directions of iron oxide, iron oxide/iron hydroxide, ferrous oxide, etc., can solve the problems of high equipment requirements and difficult control of powder particle shape, and achieves simple operation. , the composition and morphology are controllable, and the preparation cost is low.
Active Publication Date: 2018-07-27
HEFEI UNIV
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The methods for industrial production of these two iron oxides mainly include calcination and solid phase reduction, and these methods usually have certain limitations: for example, the obtained α-Fe 2 o 3 and Fe 3 o 4 The shape of the two powder particles is difficult to control and the equipment requirements are high
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Embodiment 1
[0021] The preparation of the alkaline extract of embodiment 1, cattail velvet
[0022] Add dry cattail velvet to NaOH aqueous solution and soak for 36h, the weight ratio between cattail velvet and NaOH is 5:1, the concentration of NaOH aqueous solution is 0.5mol / L, and then filter to obtain brownish red, pH value of about 10 Alkaline extract.
Embodiment 2
[0023] Example 2, α-Fe 2 o 3 Powder Preparation and Characterization
[0024] (1) Weigh 1.0g of FeCl 3 ·6H 2 O in a beaker, pipette the alkaline cattail velvet extract prepared in Example 1 with a pipette gun and adjust the pH value to 4-6, then add deionized water to 30 mL, and disperse evenly through ultrasound.
[0025] (2) Pour the uniformly dispersed suspension into the reaction kettle, put it in a blast drying oven at a temperature of 180°C, and set different holding times (6h, 12h, 18h, 24h) to investigate the effect of different reaction times on the reaction products. shape influence.
[0026] (3) Pour the reaction product obtained in the reactor into a beaker, perform ultrasonic cleaning, natural precipitation, filtration, and drying to obtain α-Fe 2 o 3 Micro-nano structured ellipsoidal powder.
[0027] figure 2 It is the SEM figure of the product obtained when the reaction time in Example 2 is respectively (a) 6h, (b) 12h, (c) 18h and (d) 24h. It can be s...
Embodiment 3
[0029] Example 3, Fe 3 o 4 Powder Preparation and Characterization
[0030] (1) Weigh 1g of FeCl 3 ·6H 20 in a beaker, pipette the alkaline cattail velvet extract prepared in Example 1 of different additions (5mL, 15mL, 30mL) successively with a pipette gun, to investigate the impact of different alkaline extract additions on the form of the reaction product . Adjust the pH value to above 6 and below 14, then add deionized water to make up to 30ml, and disperse evenly by ultrasonic.
[0031] (2) Pour the uniformly dispersed suspension into the reaction kettle and place it in a blast drying oven at a temperature of 180° C. and a holding time of 24 hours.
[0032] (3) Pour the product in the reactor into a beaker, perform ultrasonic cleaning and magnetic separation to obtain Fe 3 o 4 Micro-nano structured fibers.
[0033] Figure 4 It is the SEM figure of the micro-nano particle product obtained when the alkaline extract of cattail velvet in Example 3 is respectively (a...
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Abstract
A method of controllably preparing ferricoxidepowder with cattail wool relates to the technical field of preparation of ferricoxidepowder. The method includes the steps of: forming a reaction system with an alkaline extract liquid of cattail wool and ferricchloride and controlling the pH of the reaction system to 4-14 by changing addition amount of the alkaline extract liquid; and performing a hydrothermal reaction and post-treatment to prepare the ferric oxidepowder. In the method, two kinds of ferric oxide powders are successfully prepared through a simple hydrothermal method. A series of representation shows that alpha-Fe2O3 and Fe3O4 powders prepared from the reaction system formed by the alkaline extract liquid of cattail wool have narrow particle size distribution and uniform particle size, are high in purity and have strong ferromagnetism. The method can utilize the abundant cattail wool resource and is low in preparation cost. The constitution and appearance of the products are controllable. The method has simple operations and is hopeful to be applied to large-scale production of high-quality ferric oxide powders.
Description
technical field [0001] The invention relates to the technical field of iron oxide powder preparation, in particular to a method for controllably preparing iron oxide powder by using cattail velvet. Background technique [0002] Cattail velvet is a common biomass material, which has the characteristics of abundant resources and low cost. Due to the lack of understanding of cattail velvet, most of the cattail velvet is left to fend for itself, resulting in a great waste of natural resources. At present, although there are also many reports on the utilization of cattail velvet, these reports are mainly limited to some simple utilization of cattail velvet, such as pillow wool material, thermal insulation material, buoyancy material and oily wastewaterfilter material, etc. . The practical application of these aspects mainly utilizes its own physical properties (soft, low density and smooth surface, etc.), so its utilization rate and utilization value have not reached a very hi...
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