Preparation method of cerium-loaded material of hydrochloric acid modified zeolite and application in norfloxacin-polluted water body

A technology for modifying zeolite and zeolite, which is used in water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of long reaction time and low adsorption rate of norfloxacin, and achieves low cost and effective space. The effect of widening and high adsorption rate

Active Publication Date: 2017-05-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The object of the present invention is to aim at the problem that natural clinoptilolite has low adsorption rate to norfloxacin, provide a kind of natural clinoptilolite modification method with low cost, easy to operate, and little secondary pollution, and solve the problem that natural zeolite has no effect on norfloxacin. The problem of low adsorption rate and long reaction time of Floxacin

Method used

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  • Preparation method of cerium-loaded material of hydrochloric acid modified zeolite and application in norfloxacin-polluted water body
  • Preparation method of cerium-loaded material of hydrochloric acid modified zeolite and application in norfloxacin-polluted water body
  • Preparation method of cerium-loaded material of hydrochloric acid modified zeolite and application in norfloxacin-polluted water body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of modified zeolite, comprises the steps:

[0037] 1) Pass natural clinoptilolite through 8-mesh and 20-mesh standard sieves, take zeolite between 8-mesh and 20-mesh, shake and wash with deionized water several times, soak in deionized water for 12 hours, and dry at 105°C.

[0038] 2) Nitric acid, sodium hydroxide, and sodium chloride solutions with concentrations of 0.2mol / L, 0.5mol / L, and 1.0mol / L were prepared respectively, and the prepared concentrations were 0.05mol / L, 0.1mol / L, 0.2mol / L, Take 100 mL of 0.5 mol / L and 1.0 mol / L hydrochloric acid solutions into conical flasks respectively, and add 10 g of zeolite after particle size pretreatment respectively. Oscillate for 2h in a constant temperature oscillator with a rotational speed of 200r / min.

[0039] 3) The reacted zeolite is taken out, washed with deionized water until neutral, and dried at 105°C.

[0040] The scanning electron microscope pictures of natural zeolite and material G are...

Embodiment 2

[0042]The preparation method of modified zeolite, comprises the steps:

[0043] Take 10g of material G, and take 1.86g of cerium chloride heptahydrate into a beaker, add 100mL of deionized water, and heat in a water bath at 70°C for 3h. Evaporate to dryness in a water bath at 100°C, and dry at 50°C.

[0044] The EDS spectra of natural zeolite, material G and material Ce@G zeolite are as follows image 3 As shown, compared with the mass percentage of natural zeolite aluminum in material G, the thermal stability and hydrothermal stability of material G are enhanced. Compared with natural zeolite and material G, Ce@G zeolite has a new Ce in the spectrum. while in figure 1 In the scanning electron microscope analysis of the material, a white substance appeared on the surface of the material Ce@G zeolite. Combining these two characterizations, it can be proved that Ce is loaded on the surface of material G.

Embodiment 3

[0046] The effect of zeolite on the loading rate of cerium on the adsorption kinetics of norfloxacin:

[0047] 1) Take 10g of material G, respectively take 3.73g, 1.86g, 0.93g, 0.47g, and 0.23g of cerium chloride heptahydrate into a beaker, add 100mL of deionized water, and heat in a water bath at 70°C for 3h. Evaporate to dryness in a water bath at 100°C, and dry at 50°C. Materials A, Ce@G zeolite, C, D, E were obtained.

[0048] 2) Pipette 100mL of norfloxacin solution with a concentration of 10mg / L into a conical flask, place it in a constant temperature oscillator, and add 1g of materials A, Ce@G zeolite, C, and D to each conical flask respectively With E, the oscillation temperature is 298K, and the oscillation speed is 200r / min. The supernatant was taken at 5min, 15min, 30min, 45min, 60min, 90min, 120min, 180min, 240min and 300min respectively, passed through a 0.22μm filter membrane, and determined in HPLC. Two parallel samples were set up for each reaction.

[0049...

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Abstract

The invention discloses a preparation method of cerium-loaded material of hydrochloric acid modified zeolite and an application in a norfloxacin-polluted water body. The preparation method comprises the following steps of using natural clinoptilolite as raw material, and modifying the natural clinoptilolite by hydrochloric acid, nitric acid, sodium chloride and sodium hydroxide. The preparation method has the advantages that 0.1mol / L of hydrochloric acid is used as an optimum modifying solution to dissolve the original impurities which are blocked in zeolite pore channels, the original large-radius cation ions in the zeolite pore channels are replaced, the modifying solution reacts with the zeolite, and the specific surface area of the zeolite is increased from 2.89m<2> / g to 10.71m<2> / g; on the basis of modified zeolite, the rare earth element of Ce (cerium) is loaded, the number of active sites of the zeolite is increased, and the absorbing rate on norfloxacin is obviously improved; the cost is low, the technology is simple, and the operation is convenient; the dynamics fitting of Ce@G zeolite to norfloxacin has better effect on secondary dynamics, and compared with the natural zeolite, the constant of secondary adsorbing rate is increased by 2.5 times; in the actual application, the time of the material removing the norfloxacin is shortened.

Description

technical field [0001] The invention belongs to the technical field of preparation of adsorption materials and restoration of polluted water bodies, and particularly relates to a modified adsorption material for norfloxacin-polluted water bodies-a preparation method of hydrochloric acid-modified zeolite-loaded cerium materials and its use in norfloxacin-polluted water bodies Applications. Background technique [0002] Norfloxacin has been detected in both surface water and groundwater. Norfloxacin in water can cause bacteria to develop drug resistance and may threaten human health through the food chain. Due to the stability of norfloxacin, it is difficult to effectively remove it by traditional water treatment processes. Therefore, it is urgent to develop an effective method to remove norfloxacin from water. [0003] The existing treatment methods of norfloxacin include: C-TiO 2 Photocatalysis, ultrasonic degradation, adsorption, etc., among which adsorption is an effect...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30C02F1/28C02F101/38
CPCB01J20/0207B01J20/186C02F1/281C02F2101/38
Inventor 方战强王冠
Owner SOUTH CHINA NORMAL UNIVERSITY
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