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Co2FeAl-LDH, preparation method of Co2FeAl-LDH and method for degrading pollutants

A co2feal-ldh, sewage technology, applied in water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as difficulty in drug removal, and achieve the effects of easy recovery, good stability and good reusability

Active Publication Date: 2020-02-18
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional water treatment methods such as adsorption, coagulation and biodegradation are very difficult to remove these drugs, so we need new degradation methods to deal with these pollutants

Method used

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  • Co2FeAl-LDH, preparation method of Co2FeAl-LDH and method for degrading pollutants
  • Co2FeAl-LDH, preparation method of Co2FeAl-LDH and method for degrading pollutants
  • Co2FeAl-LDH, preparation method of Co2FeAl-LDH and method for degrading pollutants

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preparation example Construction

[0032] The present invention provides a novel Co 2 The preparation method of FeAl-LDH comprises the following steps:

[0033] Dissolving cobalt nitrate, iron nitrate, aluminum nitrate and urea in water to obtain a homogeneous solution;

[0034] React the homogeneous solution at 105-115°C for 22-26 hours to obtain Co 2 FeAl-LDH nanosheets.

[0035] The method provided by the invention can prepare Co 2 FeAl-LDH, and it can be used as a catalyst to efficiently activate persulfate to generate strongly oxidized sulfate radicals, and rapidly catalyze the degradation of pollutants in sewage, such as: methoxazole, ciprofloxacin and tetracycline. The process is simple, highly maneuverable, and does not require additional capacity. Co prepared by the method provided by the invention 2 FeAl-LDH is a heterogeneous catalyst, easy to recover, and has good stability and good reusability.

[0036] In the present invention, the nitrate of cobalt is preferably selected from Co(NO3 ) 2 ·6...

Embodiment 1

[0051] co 2 FeAl-LDH material activates persulfate to degrade sulfamethoxazole in water.

[0052] (1)Co 2 Preparation of FeAl-LDH material: 0.01mol of Co(NO 3 ) 2 ·6H 2 O, 0.005mol Fe(NO 3 ) 3 ·6H 2 O and 0.005mol of Al(NO 3 ) 3 9H 2 O and 0.1 mol of urea were dissolved in 100 mL of deionized water to obtain a homogeneous solution. After the oil bath was heated to 110 °C and stirred continuously for 24 h, after cooling to room temperature, the obtained solid was filtered and washed three times with deionized water, and finally vacuum Dry to obtain the catalyst Co 2 FeAl-LDH nanosheets. figure 1 Co prepared for Example 1 of the present invention 2 X-ray crystal diffraction pattern (XRD) of FeAl-LDH; figure 2 Co prepared for Example 1 of the present invention 2 Scanning electron microscope (SEM) of FeAl-LDH; image 3 Co prepared for Example 1 of the present invention 2 Transmission electron microscopy (TEM) of FeAl-LDH.

[0053] (2) Prepare a 10 mg / L sulfametho...

Embodiment 2

[0058] co 2 FeAl-LDH material activates persulfate to degrade ciprofloxacin in water.

[0059] (1)Co 2 Preparation of FeAl-LDH material: 0.01mol of Co(NO 3 ) 2 ·6H 2 O, 0.005mol Fe(NO 3 ) 3 ·6H 2 O and 0.005mol of Al(NO 3 ) 3 9H 2 O and 0.1 mol of urea were dissolved in 100 mL of deionized water to obtain a homogeneous solution. After the oil bath was heated to 110 °C and stirred continuously for 24 h, after cooling to room temperature, the obtained solid was filtered and washed three times with deionized water, and finally vacuum Dry to obtain the catalyst Co 2 FeAl-LDH nanosheets.

[0060] (2) Prepare a ciprofloxacin solution of 10 mg / L for subsequent use.

[0061] (3) Take 50 mL of ciprofloxacin solution with a concentration of 10 mg / L in a test tube, add 0.003 g of catalyzer, 0.2 mmol / L of persulfate, and 0.003 g of catalyzer at the same time to add 0.2 mmol / L of persulfate, stirred, fixed-point sampling analysis.

[0062] Figure 5 Co prepared for the prese...

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Abstract

The invention provides Co2FeAl-LDH, a preparation method thereof and a method for degrading pollutants, and the method for the Co2FeAl-LDH comprises the following steps: dissolving nitrate of cobalt,nitrate of iron, nitrate of aluminum and urea in water to obtain a uniform solution; and reacting the uniform solution for 22 to 26 hours at the temperature of between 105 and 115 DEG C to obtain theCo2FeAl-LDH nanosheet. The Co2FeAl-LDH prepared by co-precipitating the nitrate of cobalt, nitrate of iron and nitrate of aluminum by using the urea can be used as a catalyst. By means of the synergistic effect of cobalt and iron on strongly oxidative sulfate radicals which are generated by activation of peroxymonosulfate and the carrier effect of aluminum, pollutants such as sulfamethoxazole, ciprofloxacin and tetracycline in sewage are rapidly catalyzed and degraded. The process is simple. The Co2FeAl-LDH is a heterogeneous catalyst, is easy to recycle, and has the advantages of favorable stability and favorable reusability.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, in particular to a novel Co 2 FeAl-LDH and its preparation method and method for degrading pollutants. Background technique [0002] Layered double hydroxide LDH is a hydrotalcite-like two-dimensional anionic layered compound, which is a hydroxide with a crystal structure composed of two or more metal elements. It can disperse and dope a variety of metal atoms by adjusting the ratio of metal precursors. Its chemical composition can be expressed as [M 1-x 2+ m x 3+ (OH) 2 ] x+ (A y- ) x / y ·zH 2 O, where the divalent and trivalent metal cations are Mg, respectively 2+ , Fe 2+ ,Co 2+ , Cu 2+ , Ni 2+ , Zn 2+ and Al 3+ , Cr 3+ , Ga 3+ , In 3+ , Mn 3+ , Fe 3+ , while the intermediate anion can be CO 3 2- , NO 3 - , SO 4 2- , Cl - . Due to the diversity of LDH layered composition, the exchangeability of interlayer anions and the compatibility with other mate...

Claims

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Application Information

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IPC IPC(8): B01J23/75C02F1/72C02F1/28C02F101/30
CPCB01J23/002B01J23/75B01J2523/00C02F1/281C02F1/725C02F2101/30B01J2523/31B01J2523/842B01J2523/845
Inventor 江鸿孙庆婷
Owner UNIV OF SCI & TECH OF CHINA
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