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Preparation method and application of nano calcium peroxide

A calcium peroxide, nanotechnology, applied in the field of environmental science and engineering, can solve the problems of complex operation, low purity, poor dispersibility, etc., and achieve the effects of increasing the reaction rate, shortening the reaction time, and improving the solubility.

Active Publication Date: 2020-10-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In foreign countries, CaO has been used 2 with Fe 2+ joint action to remediate polluted sites, but nanometer calcium peroxide (nCaO 2 ) case of engineering repair
And using existing domestic and foreign preparations of nCaO 2 The particle size obtained by the preparation method is larger and easier to agglomerate, especially in the most widely used preparation method using the calcium chloride method as the substrate, it is necessary to slowly add H at a certain rate 2 o 2 The operation is complex and time-consuming, which is not conducive to the preparation of large quantities
while common commercially available CaO 2 low purity and poor dispersion

Method used

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  • Preparation method and application of nano calcium peroxide
  • Preparation method and application of nano calcium peroxide
  • Preparation method and application of nano calcium peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: A method for preparing nanometer calcium peroxide

[0052] The specific steps of the method are:

[0053] (1) At 25℃ and room temperature, take a certain amount of deionized water into the conical flask, add 5g calcium chloride (CaCl 2 ), 15ml of 1mol·L -1 Ammonia, 0.2g stabilizer: sodium dihydrogen phosphate (NaH 2 PO 4 ), 0.5g dispersant: cetyltrimethylammonium bromide (CTAB), stir evenly and place it on a magnetic stirrer and stir at a constant speed. Among them, the ammonia solution can neutralize the generated HCl and promote CaO 2 The generation;

[0054] (2) After stirring evenly, add 15ml of 30% H 2 O 2 , At this time, the addition of stabilizer reduces H 2 O 2 The decomposition of H 2 O 2 Utilization rate and CaO in the product 2 Content. CaCl reacts in solution 2 +H 2 O 2 →CaO 2 +2HCl;

[0055] (3) When the solution becomes a light yellow viscous liquid, adjust the CaO with ammonia solution 2 Sedimentation, in the centrifugal state, the CaO 2 The precipita...

Embodiment 2

[0063] Example 2: Application of Nano Calcium Peroxide

[0064] Diclofenac sodium (DCF) was used as the target pollutant to study the removal effect of Fenton-like technology based on nano-calcium peroxide.

[0065] Take the nano-calcium peroxide prepared in Example 1 as the experimental group, and H 2 O 2 And commercially available calcium oxide as the control group. The experiment was carried out in a 250ml glass Erlenmeyer flask equipped with a magnetic stirrer at room temperature, adding a buffer solution of DCF with an initial concentration of 0.02mM, and then adding an initial concentration of 10mM EDTA-Fe 2+ Solution, make the solution finally reach 100ml, and finally add nano calcium peroxide / H 2 O 2 / Commercial calcium oxide is the beginning of the reaction. After a certain time interval, samples are taken and an excessive amount of quencher is added to terminate the reaction, and then filtered through a 0.22μm filter membrane for high performance liquid chromatography (HPL...

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Abstract

The invention discloses a preparation method and application of nano calcium peroxide, and belongs to the technical field of environmental science and engineering. The method comprises the following steps: by taking calcium chloride and hydrogen peroxide as raw materials, adding a dispersing agent and a stabilizing agent into the calcium chloride, and then adding the hydrogen peroxide for reactionto prepare the nano calcium peroxide. The stabilizing agent is added to reduce decomposition of the H2O2, shorten the reaction time and increase the specific surface area of the nano calcium peroxide. The preparation method disclosed by the invention only needs 2 hours, while the traditional method needs 6 hours, and compared with the traditional preparation method which takes the calcium chloride as a substrate, the preparation method disclosed by the invention is simpler and quicker; the purity of the nCaO2 prepared by the method disclosed by the invention is relatively high and can reach 82.6%, and the purity of the commercially available CaO2 is 50-70%; the specific surface area of the nCaO2 prepared by the method is large (64.2 m < 2 > / g), and the specific surface area of the commercially available CaO2 is about 3.7 m < 2 > / g.

Description

Technical field [0001] The invention relates to a preparation method and application of nano calcium peroxide, and belongs to the field of environmental science and engineering technology. Background technique [0002] CaO 2 It is a white or yellow crystalline powder, odorless, tasteless, non-toxic and harmless, and has a wide range of applications in many fields. In the past period of time, CaO 2 In environmental remediation, it is used as an oxygen release agent to strengthen the remediation of aerobic organisms. Some recent studies have shown that CaO 2 Has a strong ability to oxidize organic pollutants, similar to the use of Fe in Fenton technology 2+ Catalytic H 2 O 2 The Fenton-like technology that generates hydroxyl radicals (·OH) is an advanced oxidation technology that is constantly being improved and developed. It is selected for the characteristics of generating free radicals with strong oxidizing ability and strong non-selective oxidizing ability. Among them, CaO 2 Be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/043B82Y40/00C09K17/06C02F1/72C02F101/38C02F101/36C02F101/34
CPCB82Y40/00C01B15/043C01P2004/62C01P2004/64C01P2006/12C01P2006/80C02F1/722C02F1/725C02F2101/34C02F2101/36C02F2101/38C02F2305/026C09K17/06
Inventor 缪恒锋姜莹莹阮文权
Owner JIANGNAN UNIV