A rapidly degrading malachite green ag 2 moo 4 /ag 2 oMaterial preparation method

A malachite green and rapid degradation technology, applied in chemical instruments and methods, water/sludge/sewage treatment, metal/metal oxide/metal hydroxide catalysts, etc., can solve catalyst recovery troubles, complex synthesis steps, Environmental secondary pollution and other problems, to achieve the effect of short decolorization time, high reuse rate, simple preparation process

Active Publication Date: 2022-07-19
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the existing iron-based Fenton-like catalysts for degrading MG all have the disadvantages of long degradation time and complex synthesis steps. At the same time, there are also problems such as catalyst recovery troubles, which limit their further utilization and cause environmental pollution. secondary pollution
In recent years, silver salts including Ag 2 O, Ag 2 MoO 4 As a photocatalyst, it has been successfully applied to the photocatalytic degradation of pollutants such as methyl orange and Cr(VI), but it is rare to combine silver salts with H 2 o 2 Composition of Fenton-like systems for catalytic degradation of organic dyes

Method used

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  • A rapidly degrading malachite green ag <sub>2</sub> moo <sub>4</sub> /ag <sub>2</sub> oMaterial preparation method
  • A rapidly degrading malachite green ag <sub>2</sub> moo <sub>4</sub> /ag <sub>2</sub> oMaterial preparation method
  • A rapidly degrading malachite green ag <sub>2</sub> moo <sub>4</sub> /ag <sub>2</sub> oMaterial preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A Rapidly Degrading Malachite Green Ag 2 MoO 4 / Ag 2 The O material preparation method includes the following steps:

[0030] Ag preparation by hydrothermal method 2 MoO 4 / Ag 2 O complex, the specific operation is as follows: in the presence of 20.0mL of 1.2M Na 2 MoO 4 ·2H 2 Add 0.1M Na to the beaker of O 2 HPO 4 ·12H 2 O 20mL, continue stirring for 5min, add 2.2mL HNO 3 , 0.6M AgNO was added dropwise 3 10mL, continue to stir for 15min, slowly add 4M NaOH to pH=7, let stand for 15min, discard most of the supernatant, take about 20mL of the suspension and transfer it to a 25mL polytetrafluoroethylene-lined autoclave, 120 React in a constant temperature oven for 14 h, filter with suction, wash with pure water 3 times, transfer to a crucible, and dry in an incubator at 80 °C for 12 h for use.

[0031] Depend on figure 1 It can be seen that the Ag obtained by the above preparation method 2 MoO 4 / Ag 2 XRD characterization results of O material.

[0032]...

Embodiment 2

[0034] The silver-based Fenton heterogeneous catalyst prepared in Example 1 was applied to degrade the MG in the wastewater, and the results were as follows image 3 , as shown in Figure 4.

experiment example

[0043] In the traditional Fenton reaction, iron ions are not easy to be recycled, resulting in secondary pollution. In this study, the use of Ag 2 MoO 4 / Ag 2 The heterogeneous phase of O was recovered and the reuse rate was determined. Depend on Figure 5 It can be seen that Ag 2 MoO 4 / Ag 2 O catalyst binds H after 5 recoveries 2 O 2 The degradation rate of MG was 87.9% at 5min, 91.8% at 20min, and 93.6% at 40min, indicating that Ag 2 MoO 4 / Ag 2 O recycling performance is good, and has a good application prospect.

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Abstract

The invention discloses a Fenton-like catalyst Ag for rapidly degrading malachite green 2 MoO 4 / Ag 2 O material, preparation method and application thereof. Using disodium hydrogen phosphate, sodium molybdate and silver nitrate as raw materials, using chemical precipitation method, synergistic hydrothermal method to synthesize a new type of Ag by self-doping silver oxide 2 MoO 4 / Ag 2 O-type Fenton catalyst, wherein the optimum pH of the synthesis reaction, the feeding ratio of sodium molybdate and silver nitrate, and the conditions of the hydrothermal reaction are determined; the catalyst is combined with H 2 O 2 After mixing, it can be applied to efficiently degrade malachite green in a suitable pH environment. The study found that Ag 2 MoO 4 / Ag 2 O‑H 2 O 2 The decolorization rate of malachite green by the heterogeneous Fenton-like composite system is as high as 99.7% within 6 minutes. The preparation method of the photocatalyst of the invention is simple, easy to operate, has the advantages of low toxicity, low price, etc., and has very high research value in the field of degrading organic dyes.

Description

technical field [0001] The invention relates to the field of catalytic degradation of organic pollutants, in particular to a kind of Ag 2 MoO 4 / Ag 2 Preparation method and catalytic conditions of O. Background technique [0002] Since high-energy electrons in elemental silver are easily recombined with low-energy holes under the action of Coulomb gravity, the photocatalytic activity of silver element is not high, and the silver-based materials that really show high photocatalytic activity are silver compounds. Including silver-containing halides, oxides, sulfides, metal oxides and oxo acid salts. Surface plasmonic photocatalyst Ag / AgI / Al was also prepared by Hu et al. 2 O 3 , the material also showed efficient photocatalytic activity and stability; Yi et al. used a simple ion exchange reaction to prepare highly efficient degraded Ag 3 PO 4 A photocatalyst capable of completely decolorizing dyes within minutes; Guo et al. synthesized Fe by hydrothermal and ion-exchang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68C02F1/72C02F101/30C02F101/36C02F101/38
CPCB01J23/68B01J23/002C02F1/725C02F1/722C02F2101/308C02F2101/38C02F2101/36C02F2305/026
Inventor 韦寿莲张俊权黄象金谢春生
Owner ZHAOQING UNIV
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