Heavy metal ion adsorbent ferrite hollow spheres MFe2O4

A technology of ferrite hollow spheres and heavy metal ions, which is applied in the fields of environmental protection and environmental water treatment, can solve the problems of limited maximum adsorption capacity, and achieve good application and promotion value, high controllability, and strong adsorption capacity

Inactive Publication Date: 2014-11-19
HENAN UNIVERSITY
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Problems solved by technology

However, the MFe prepared in these research reports 2 o 4 (M=Fe, Co, Mn or Zn) compound products have limited maximum adsorption capacity for chromium and arsenic, therefore, further research is needed to explore the improvement of MFe 2 o 4 (M=Fe, Co, Mn or Zn) Compounds New Preparation Method for Adsorption Ability of Chromium and Arsenic

Method used

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  • Heavy metal ion adsorbent ferrite hollow spheres MFe2O4
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  • Heavy metal ion adsorbent ferrite hollow spheres MFe2O4

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Experimental program
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Effect test

Embodiment 1—4

[0032] Ferrite Hollow Ball FeFe 2 o 4 The preparation method of adsorbent comprises the following steps:

[0033] (1) Dissolve 1.5 mmol (0.567 g) of ferric chloride hexahydrate, 3 mmol (0.612 g) of trisodium citrate dihydrate, and 4.5 mmol (0.345 g) of anhydrous sodium acetate in 30 ml of deionized water to form a a light green transparent solution;

[0034] (2) Add 0.3g PAM (polyacrylamide) to the solution in step (1), and stir vigorously for 30 minutes until PAM is completely dissolved;

[0035] (3) Transfer the solution in step (2) to a reaction kettle with a capacity of 40mL, react at 180°C for 12h, and cool to room temperature after the reaction;

[0036] (4) Wash the sample obtained in step (3) with deionized water and ethanol, and dry it in vacuum at 60°C for 6 h to obtain the micronano-structured ferrite hollow sphere FeFe 2 o 4 (i.e. ferric oxide Fe 3 o 4 ).

Embodiment 2

[0037] It should be noted that by changing the 1.5 mmol ferric chloride hexahydrate raw material in step (1) to 1.0 mmol (0.378 g) ferric chloride hexahydrate and 0.5 mmol (0.173 g) cobalt chloride hexahydrate, iron can be prepared Cobalt acid hollow sphere CoFe 2 o 4 , which is Example 2 ;

[0038] Change the raw material of 1.5 mmol ferric chloride hexahydrate in step (1) to 1.0 mmol (0.378 g) ferric chloride hexahydrate and 0.5 mmol (0.068 g) zinc chloride to prepare zinc ferrite hollow spheres Zn Fe 2 o 4 , which is Example 3 ;

[0039] Change the raw material of 1.5 mmol ferric chloride hexahydrate in step (1) to 1.0 mmol (0.378 g) ferric chloride hexahydrate and 0.5 mmol (0.0985 g) manganese chloride tetrahydrate to prepare manganese ferrite hollow spheres MnFe 2 o 4 , which is Example 4 .

[0040] For the prepared Fe 3 o 4 (Example 1), CoFe 2 o 4 (Example 2), ZnFe 2 o 4 (Example 3), MnFe 2 o 4 (Example 4) The XRD collection of patterns sees figure 1...

experiment example

[0046] In order to detect the actual adsorption effect of the ferrite hollow sphere adsorbent provided by the present invention on hexavalent chromium ions or pentavalent arsenic ions, the inventor has done a further detection experiment, and the experimental process is briefly described as follows:

[0047] During the experiment, the amount of ferrite hollow sphere adsorbent was 10 mg / L.

[0048] During the experiment, the simulated wastewater was a heavy metal ion solution prepared with sodium arsenate and potassium dichromate, composed of NaOH solution and HNO 3 The solution adjusts the pH value of the heavy metal ion solution.

[0049] In the specific experiment, the ferrite hollow spheres and the simulated wastewater were placed in a plastic conical flask at room temperature. During the adsorption process, the conical flask was placed in a 250 n / mim ultrasonic instrument to disperse the adsorbent evenly until the adsorption was achieved. Equilibrium: After adsorption equ...

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Abstract

The invention belongs to the technical field of environmental protection and environmental water treatment and in particular relates to a heavy metal ion adsorbent ferrite hollow spheres MFe2O4 (M=Fe, Co, Mn or Zn) and a preparation method thereof. The preparation method of the ferrite hollow spheres MFe2O4 belongs to a hydrothermal synthesis method, and the prepared ferrite hollow spheres are 180nm-380nm in diameter and 20nm-45nm in shell layer thickness and are used for adsorbing heavy metal ions As (V) and/or Cr (VI). The preparation method provided by the invention is simple and feasible, environment-friendly, pollution-free, low in equipment requirement and high in controllable degree; the raw material source is wide and the production cost is low; compared with a compound prepared in the prior art, the prepared heavy metal ion adsorbent is relatively high in adsorption capacity, and the adsorption capacity aiming at arsenic and chromium heavy metal ions reaches up to 340mg/g and is far beyond that in the prior art, so that the heavy metal ion adsorbent has relatively good application and promotion values.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and environmental water treatment, and in particular relates to a heavy metal ion adsorbent ferrite hollow sphere MFe 2 o 4 (M=Fe, Co, Mn or Zn) and its preparation method. Background technique [0002] The adsorption capacity and adsorption efficiency of adsorbent materials depend on the specific surface area, pore structure and surface structure of the adsorbent. In the prior art, most adsorbents are porous materials, so as to provide sufficient adsorption surface area, and the development of adsorbents with large specific surface area and diffusion resistance is very important in practical engineering applications. The general requirements of the adsorption material are: strong adsorption capacity for the adsorbate; no chemical reaction with the adsorbate and the medium; easy to manufacture and easy to regenerate; good mechanical strength, etc. Reducing size, increasing pore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C01G49/08B01J20/06B01J20/30B01J20/28C02F1/28
Inventor 黎桂辉兑静娜周少敏巩合春贾献彬
Owner HENAN UNIVERSITY
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