Lamelleted graphite carbon nitride/montmorillonoid composite material as well as preparation method and application thereof

A composite material, phase carbon nitride technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of difficult separation, easy agglomeration of materials, and increased adsorption capacity of heavy metal ions. , to achieve the effects of environmental friendliness, simple preparation steps and mild conditions

Inactive Publication Date: 2019-11-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The approach is via the negatively charged layered g-C on the surface 3 N 4 Composite of nanosheets and acid-modified montmorillonite to solve g-C 3 N 4 The problem of easy agglomeration and diffic...

Method used

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  • Lamelleted graphite carbon nitride/montmorillonoid composite material as well as preparation method and application thereof
  • Lamelleted graphite carbon nitride/montmorillonoid composite material as well as preparation method and application thereof
  • Lamelleted graphite carbon nitride/montmorillonoid composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Layered g-C 3 N 4Preparation of nanosheets: Take 5g of melamine and lay it flat on a ceramic ark, wrap the ark with tin foil to form a fully closed system and put it into a tube furnace for calcination. Control the heating rate from room temperature to 5°C / min, and the holding time to 3h , after naturally cooling to room temperature, the yellow product was ground into powdery particles to obtain bulk carbon nitride; the above-mentioned small amount of bulk carbon nitride was spread in a ceramic ark to form a semi-closed system and put into a muffle furnace for heating Oxidation treatment, heat preservation at 500°C for 3 hours, and natural cooling to room temperature, to obtain loose light yellow g-C 3 N 4 ; take 5g g-C 3 N 4 Disperse the particles in 100mL isopropanol solution, ultrasonically treat with running water for 3 hours; then centrifuge to obtain a light yellow sediment; dry in an oven at 70°C for 12 hours, grind the light yellow sediment into powder p...

Embodiment 2

[0037] Weigh 0.1 g of adsorbents with different compound ratios, layered g-C 3 N 4 Nanosheets and Na-montmorillonite were added to 100 mL of lead nitrate solution with an initial concentration of 100 mg / L, and the pH of the solution was 5.0. Stir at room temperature for 2 h, then centrifuge (4000 r / min). The supernatant obtained by centrifugation was diluted 10 times, its concentration was measured under an atomic absorption spectrophotometer, and the concentration of remaining lead ions was calculated.

[0038] The results showed that layered g-C 3 N 4 Layered g-C with mass percentage of 0.5%, 1.0%, 2.0%, 5.0%, 10.0% 3 N 4 / The adsorption capacity of montmorillonite composites to lead ions was 59.05mg / g, 75.64mg / g, 95.36mg / g, 74.25mg / g, 57.03mg / g, and the removal rates were 59.05%, 75.64%, 95.36% %, 74.25%, 57.03%, layered g-C 3 N 4 The adsorption capacity of nanosheets to lead ions is 10.12 mg / g, and the removal rate is 10.12%. The adsorption capacity of sodium mont...

Embodiment 3

[0040] Same as the steps in Example 2, the difference is that the adsorbent is layered g-C 3 N 4 2.0% by mass of layered g-C 3 N 4 / Montmorillonite composite material, the pH values ​​adjusted by 100mg / L lead nitrate solution are 1.0, 2.0, 3.0, 4.0 respectively, and the dilution times after centrifugation are 20, 20, 20, 20 times respectively.

[0041] The results showed that layered g-C 3 N 4 2.0% by mass of layered g-C 3 N 4 / When the pH value of montmorillonite composite material is 1.0, 2.0, 3.0, 4.0, the adsorption capacity of lead ion is 25.25mg / g, 30.05mg / g, 50.13mg / g, 60.26mg / g, and the removal rate is 25.25%. , 30.05%, 50.13%, 60.26%. Depend on Figure 5 It can be seen that the adsorbent layered g-C 3 N 4 2.0% by mass of layered g-C 3 N 4 The / montmorillonite composite material has the best adsorption effect on Pb(Ⅱ) in the lead nitrate aqueous solution with pH 5.

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Abstract

The invention discloses a lamelleted graphite carbon nitride/montmorillonoid composite material as well as a preparation method and application thereof. The preparation method comprises the followingsteps: by taking bulk phase g-C3N4 prepared by using a thermal polymerization method, and lamelleted g-C3N4 nanosheets prepared through thermal oxidation peeling and solvent peeling as raw materials,performing acid treatment on Na-montmorillonite, finally mixing the lamelleted g-C3N4 nanosheets with the acid modified Na-montmorillonite solution, and performing suction filtration and drying, so asto obtain the lamelleted g-C3N4/montmorillonoid composite material. The preparation method is simple in operation, the raw materials are low in price, the composite material is environment-friendly,and in addition, the prepared lamelleted g-C3N4/montmorillonoid composite material not only has a very good removal effect on heavy metal ions in wastewater, but also is capable of effectively adsorbing organic pollutants in the wastewater, meanwhile, is capable of effectively adsorbing organic pollutants in the wastewater, and has great potential application values in the field of deep wastewatertreatment.

Description

technical field [0001] The invention relates to a layered graphite phase carbon nitride / montmorillonite composite material and its preparation method and application, belonging to the technical field of adsorption material preparation. Background technique [0002] Heavy metal ions (such as lead, cadmium, copper, etc.) and organic pollutants (such as organic dyes, antibiotics, etc.) not only damage the ecosystem, but also pose a threat to human health. Heavy metal pollutants are commonly found in industrial wastewater and soil from mining, metal processing, electroplating, etc. However, heavy metal ions are not easy to degrade, and their accumulation in water and soil will cause serious and continuous environmental pollution. At present, common methods to reduce heavy metals in water and soil include: ion exchange, membrane separation, bioflocculation, chemical precipitation, flotation and adsorption. Among them, the adsorption method has the advantages of simple and fast o...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/12B01J20/28033C02F1/281C02F2101/20C02F2101/30
Inventor 王风云万霞夏明珠雷武
Owner NANJING UNIV OF SCI & TECH
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