Diatomite composite material capable of adsorbing and degrading Cr(VI) and preparation method thereof

A composite material, adsorption degradation technology, applied in the field of heavy metal ion adsorption purification and toxic degradation materials, can solve the problems of low removal rate of heavy metal acid anions, difficult subsequent treatment of adsorbents, limited adsorption capacity, etc., to achieve good catalytic reduction ability, Improve adsorption efficiency, simple and convenient process

Inactive Publication Date: 2017-04-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, diatom raw soil has two deficiencies in the adsorption and treatment of heavy metal ions: one is the low specific surface area (25-30m 2 / g), the adsorption capacity is limited; the second is that the removal rate of heavy metal acid anions in water is low
Nanostructured materials are the materials with the most abundant surface active functional groups, which can significantly increase the specific surface area of ​​materials and chemical activities such as oxidation and reduction. However, nanostructured adsorbents have serious particle agglomeration and difficult subsequent processing of adsorbents, which is easy to cause waste and secondary secondary pollution problem

Method used

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  • Diatomite composite material capable of adsorbing and degrading Cr(VI) and preparation method thereof
  • Diatomite composite material capable of adsorbing and degrading Cr(VI) and preparation method thereof
  • Diatomite composite material capable of adsorbing and degrading Cr(VI) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 Solvothermal method prepares Nb 2 o 5 Nanorod / Diatomite Composite

[0036] (1) Weigh 0.5g of Nb 2 o 5 Put the powder into the reaction kettle, add 10mL of hydrofluoric acid to dissolve, then add ammonia water to precipitate, and make niobic acid powder for later use;

[0037] (2) Weigh 0.3g of niobic acid powder prepared in step (1), 0.5g of ammonium oxalate, 0.1g of sodium dodecylbenzenesulfonate, and 0.1g of diatomaceous earth, add them to 10mL of glacial acetic acid, and stir for 40min. Mix evenly to obtain a suspension;

[0038] (3) Transfer the suspension into a polytetrafluoroethylene reactor with a volume of 25 mL, place the reactor in an oven at 160° C. and heat it at a constant temperature for 14 hours; then take out the reactor, cool it to room temperature, filter the reaction product, and Wash 3-4 times with ethanol and deionized water, and dry at low temperature to obtain Nb2 o 5 Nanorod / Diatomaceous Earth Composite.

Embodiment 2

[0039] Embodiment 2 Solvothermal method prepares Nb 2 o 5 Nanorod / Diatomaceous Earth Composite

[0040] The only difference between the preparation method and Example 1 is that in step 2) when preparing the suspension, the amount of niobic acid powder added is 0.4 g.

Embodiment 3

[0041] Embodiment 3 Solvothermal method prepares Nb 2 o 5 Nanorod / Diatomaceous Earth Composite

[0042] The only difference between the preparation method and Example 1 is that in step 2) when preparing the suspension, the amount of niobic acid powder added is 0.5 g.

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Abstract

The invention relates to a diatomite composite material capable of adsorbing and degrading Cr(VI) and a preparation method thereof. The composite material is prepared by loading niobium oxide with an ordered nanostructure onto a diatomite disc; and raw materials for preparation of the composite material comprises Nb2O5 powder, hydrofluoric acid, ammonia water, ammonium oxalate, sodium dodecyl benzene sulfonate, diatomite, acetic acid, etc. The preparation method comprises the following steps: preparing the Nb2O5 powder into a niobic acid powder, and carrying out uniform mixing with the raw materials so as to prepare a suspension; and carrying out a reaction under heating, and carrying out cooling, filtering, washing and low-temperature drying. The diatomite composite material provided by the invention has excellent Cr (VI) adsorption and degradation performances, can effectively solve the limitation in application of nanometer structural materials in the prior art, and can significantly improve adsorption efficiency of diatomite. The method provided by the invention has the advantages of simple, convenient and fast process flow, less investment, rich material sources, low cost, easily availability, low processing cost, etc.

Description

technical field [0001] The invention belongs to the technical field of heavy metal ion adsorption purification and toxic degradation materials, in particular to a preparation method and application of a composite adsorbent, and more specifically to a diatomite-deposited Nb 2 o 5 The composite material of nanorods can efficiently adsorb and degrade Cr(Ⅵ). Background technique [0002] Chromium is recognized as one of the most toxic heavy metal pollutants. It can invade the human body for a long time through the digestive tract, respiratory tract, skin and mucous membranes, interfere with the activity of biological enzymes, cause mutagenesis, and cause great harm. Its pollution control has attracted much attention. Cr (Ⅵ) (hexavalent chromium), which exists in water, is more soluble than Cr (Ⅲ) (trivalent chromium), has strong toxicity, and is difficult to treat. Highly toxic Cr(Ⅵ) ions are adsorbed and separated from water, and there is still the problem of re-pollution cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/22
CPCB01J20/06B01J20/12C02F1/281C02F2101/22
Inventor 杜玉成张时豪孙靖忠王金淑吴俊书
Owner BEIJING UNIV OF TECH
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