Needle-sized nanometer iron oxide adsorbent and preparation method thereof

An iron oxyhydroxide and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problem of high preparation cost of iron oxyhydroxide, and achieve environmental protection and emission reduction. The process is easy and widely used Prospects, the effect of cheap and easily available raw materials

Inactive Publication Date: 2018-12-04
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current problems of high preparation cost of iron oxyhydroxide, the present invention provides an iron oxyhydroxide with cheap and easy-to-obtain raw materials, simple preparation process, mild conditions, and excellent adsorption performance for organic dyes.

Method used

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  • Needle-sized nanometer iron oxide adsorbent and preparation method thereof
  • Needle-sized nanometer iron oxide adsorbent and preparation method thereof
  • Needle-sized nanometer iron oxide adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Preparation of needle-like nano-iron oxyhydroxide adsorbent

[0031] Weigh 2.16 g FeCl respectively 3 ·6H 2 O and 0.36 g urea were added to a mixture of 30 mL glycerol and 30 mL deionized water, stirred and ultrasonicated for a total of 10 min, and an orange-yellow transparent reaction solution was obtained after dissolution. The above reaction solution was transferred to a polytetrafluoroethylene-lined autoclave for solvothermal reaction at 140 °C for 3 h, cooled to room temperature after the reaction, and washed with deionized water and ethanol three times in sequence. Dry it in an oven at 80 °C for 4 h, and grind it into a powder, that is, sample S1; its X-ray diffraction pattern and scanning electron microscope pattern are as follows: figure 1 and figure 2 shown. Depend on figure 1 It can be seen that the peaks at (310), (211), (301), (411) and (521) of the synthesized adsorbent are the characteristic diffraction peaks of iron oxyhydroxide, which is ...

Embodiment 3

[0034] Example 3 The adsorption performance of iron oxyhydroxide adsorbent to Congo red

[0035] Select Congo red as the target toxic and harmful dye pollutant, and simulate the dye-contaminated water body: Weigh 0.4 g of Congo red solid powder, dissolve it with a small amount of deionized water ultrasonically, transfer it to a 1000 mL volumetric flask to constant volume, and then configure 400 mg / L Congo red solution, as a simulated Congo red polluted water sample.

[0036]Use a pipette to take 2 parts of 20 mL Congo red solution and place them in 2 Erlenmeyer flasks respectively. At room temperature, add 0.02 g of adsorbents S1 and C1 respectively, put them into a constant temperature oscillator at 25 °C and oscillate at 200 r / min for adsorption. At 5, 10, 20, 40, 60, 80, and 100 min of adsorption, the concentration of Congo red in C1 was measured with a UV-visible spectrophotometer. At 90 and 100 min, the concentration of Congo red in S1 was measured by UV-Vis spectrophot...

Embodiment 4

[0038] Example 4 N of the needle-shaped nano-iron oxyhydroxide adsorbent 2 Adsorption-desorption curve and pore size distribution characterization

[0039] Use N 2 Determination of specific surface and pore structure by static adsorption capacity method: use a fully automatic specific surface area and pore size analyzer ASAP2000 (Micromeritics, USA). Before the test, the adsorbent samples were first degassed in vacuum for 5 hours, and then cooled to a temperature close to the liquidation point of nitrogen (77K) for nitrogen adsorption and desorption tests. The specific surface area of ​​the adsorbent was calculated by the adsorption isotherm model equation proposed by BET. Due to the phenomenon of capillary condensation, a hysteresis loop will be formed on the adsorption-desorption curve, so as to obtain the pore structure information, and calculate the average pore size and pore size distribution by BJH method, the results are as follows Figure 7 shown. Figure 7 Typical...

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Abstract

The invention provides a method for preparing a needle-sized nanometer iron oxide adsorbent. The method comprises the following steps: respectively dissolving inorganic iron salt and urea in a mixtureof glycerol and deionized water to obtain a mixed solution; stirring the mixed solution, ultrasonically dissolving the mixed solution, then transferring the material to a high-pressure reaction vessel with a polytetrafluoroethylene liner for a solvothermal reaction to form a precipitated product in the reaction vessel; and performing steps of washing centrifugation and drying to obtain the needle-sized nanometer iron oxide adsorbent. The needle-sized nanometer iron oxide adsorbent prepared by the invention has stable performance, has good adsorption capacity for anionic dyes such as Congo red, and can be used for efficiently treating the pollution problem of the organic pollutant Congo red in the water body; the organic solvent used in the preparation process is used with a small amount,and the harm to the environment is low; the treatment of the organic dye Congo red-polluted water body does not cause secondary pollution; the method is simple and easy to prepare, the preparation conditions are mild, the raw materials are cheap and easy to acquire, and the process cost is low.

Description

technical field [0001] The invention relates to a shape-controllable needle-shaped nano-iron oxyhydroxide adsorbent, a preparation method thereof and an application in degrading organic dye wastewater, belonging to the technical field of wastewater treatment. Background technique [0002] Dye wastewater, as a typical source of wastewater pollution, has become an environmental problem to be solved due to its large chroma, high COD content, high salinity, refractory degradation and serious biological toxicity. Textile, paper and other industrial enterprises are the main sources of dye wastewater. Dye wastewater is discharged into the environment in large quantities, which contains a variety of toxic organic substances, which may destroy the integrity of aquatic biological communities. Most of these substances are polyphenyl ring-substituted compounds such as aromatic halides, aromatic nitro compounds, aromatic amine compounds, biphenyls, etc., which have high biological toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F101/38C02F101/34C02F101/30
CPCB01J20/06C02F1/281C02F2101/30C02F2101/308C02F2101/34C02F2101/38C02F2101/40
Inventor 田苗刘伟王仲鹏何芳王立国
Owner UNIV OF JINAN
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