Zinc-aluminum binary hydrotalcite and application thereof as photocatalytic material used for degrading methyl violet

A catalytic material, hydrotalcite technology, applied in zinc oxide/zinc hydroxide, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as impact, achieve high dye removal rate, mild reaction conditions, and easy recycling The effect of using

Inactive Publication Date: 2012-06-27
靖江市华泰机械制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the dye wastewater is discharged directly into the env

Method used

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  • Zinc-aluminum binary hydrotalcite and application thereof as photocatalytic material used for degrading methyl violet
  • Zinc-aluminum binary hydrotalcite and application thereof as photocatalytic material used for degrading methyl violet
  • Zinc-aluminum binary hydrotalcite and application thereof as photocatalytic material used for degrading methyl violet

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Experimental program
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Embodiment 1

[0034] The preparation of embodiment 1 zinc-aluminum binary hydrotalcite

[0035] Take Zn(NO 3 ) 2 ·6H 2 O(0.3mol) and Al(NO 3 )3 9H 2 O (0.1mol) was dissolved in 300ml water to prepare solution A, 0.8molNaOH and 0.05molNa 2 CO 3 Dissolve in 300ml water to prepare solution B, add solution A and solution B dropwise to 100ml deionized water respectively, keep the dropping rate of 1 drop / second, stir vigorously at a constant temperature of 40°C, and keep the pH value between 9 and 10 After the dropwise addition, continue to stir for 60 minutes, crystallize at 65°C for 18h, centrifuge, wash the precipitate with deionized water until neutral, dry at 85°C for 12h to obtain a zinc-aluminum binary hydrotalcite (ZnAl-LDHs) sample, X-ray diffraction Figure (XRD) as figure 1 As shown, the ratio of zinc to aluminum is 3:1, that is, x is 0.25, m is 4, and the general chemical formula is

[0036] [Zn 2+ 0.75 Al 3+ 0.25 (OH) 2 ](CO 3 2- ) 0.125 4H 2 O].

Embodiment 2

[0038] Get 2000mg of zinc-aluminum binary hydrotalcites with a zinc-aluminum ratio of 3:1 prepared by the method in Example 1, scan the 200-800nm ​​wavelength range in a UV-visible spectrophotometer (type 2550, Shimadzu), and measure the zinc-aluminum binary water. Diffuse reflectance spectrum of talc, see figure 2 , according to the absorption edge of the measured spectrum, the absorption edge wavelength is obtained, and then the band gap energy is calculated according to the formula Eg=1240 / λg (Eg is the band gap energy, and λg is the absorption edge wavelength).

[0039] Conclusion: The bandgap energy of zinc-aluminum binary hydrotalcite is 3.05eV, and a dysprosium lamp can be chosen as the excitation light source.

Embodiment 3

[0041] Prepare 3 servings of 50ml 20mg·L -1 For the methyl violet aqueous solution, three parts of the zinc-aluminum binary hydrotalcite prepared by the method in Example 1 were weighed, 100 mg in each part, respectively added to the above-mentioned methyl violet aqueous solution to be treated (3 groups were formed), and the temperature was controlled at 25 ° C. pH=7, respectively placed in three different reaction models ( image 3 Among them, 3-1 is the parallel reaction model of external illumination; 3-2 is the reaction model of internal illumination; 3-3 is the ring reaction model), and the irradiation time of the dysprosium lamp is controlled to be 1h. After stirring, the three groups of solutions are centrifuged at 2000rpm for 10min, respectively. Get supernatant liquid and measure the absorbance of methyl violet at 590nm place, calculate the concentration of methyl violet according to methyl violet standard curve, according to formula (1) and (2), obtain the zinc-alumi...

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Abstract

The invention relates to zinc-aluminum binary hydrotalcite and an application thereof as a photocatalytic material used for degrading methyl violet. The hydrotalcite has a chemical general formula of [Zn<2+>1-xAl<3+>x(OH)2](CO3<2->)x/2.mH2O], wherein x is the molar ratio of Al<3+>/[Al<3+>+Zn<2+>], x is no smaller than 0.2 and no greater than 0.33, m is the number of crystal water, and m is no smaller than 2 and no greater than 6. When dihydroxyl composite hydroxide of zinc-aluminum binary hydrotalcite provided by the invention is used for catalyzing the degradation of methyl violet in dye wastewater, the reaction condition is mild, the dye removal rate is high, and materials can easily be recycled after degradation.

Description

(1) Technical field [0001] The invention relates to a hydrotalcite and its application, in particular to a zinc-aluminum binary hydrotalcite and its application as a photocatalytic material for degrading methyl violet. (2) Background technology [0002] In the current chemical industry, the printing and dyeing industry has been widely concerned due to high pollution and difficult wastewater treatment. Dye wastewater has high chroma, complex chemical composition, poor biochemical properties, and contains a variety of organic substances with biological toxicity or "three-induced" properties, which are difficult to treat by conventional methods. Organic cationic dyes are an important kind of dyes used in practice, also known as salt-based dyes and basic dyes. Methyl Violet is an organic cationic dye with the molecular formula: C 25 h 30 N 3 Cl, the structure is shown in formula (I). If the dye wastewater is directly discharged into the environment without treatment, it wil...

Claims

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Application Information

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IPC IPC(8): C01G9/02B01J27/236
Inventor 倪哲明薛继龙
Owner 靖江市华泰机械制造有限公司
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