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Montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof

A double hydroxide, nanomaterial technology, applied in the directions of alkali metal oxides/hydroxides, silicon compounds, alkali metal compounds, etc., can solve the problems of unreported, few research on flocculation, etc., and the preparation method is simple and easy. Good water stability, improved colloidal dispersion, not easy to filter

Active Publication Date: 2015-12-23
THE CITY VOCATIONAL COLLEGE OF JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although there are many studies on the adsorption properties of montmorillonite or LDH (Dasetal., 2006; An Zhihuan et al., 2007; Lian et al., 2009; Miyauchi et al., 2009; Zhu et al., 2009), the combination of positively charged LDH and negatively charged There are few studies on the flocculation of montmorillonite, and there are no reports on the use of this floc in the adsorption and purification of phosphorus-contaminated water.

Method used

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  • Montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof
  • Montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof
  • Montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof

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Embodiment 1

[0029] A kind of method that montmorillonite-based layered double hydroxide polymeric nanomaterial is used for adsorbing phosphorus: comprises the following steps:

[0030] 1) Synthesis of Mg / Al layered double hydroxide (LDH): accurate preparation of 2.0mol L -1 NaOH solution, drop by drop into the 1.0mol·L -1 MgCl 2 and AlCl 3 (Mg 2+ / Al 3+ =3.0) in a polyethylene plastic bottle of the mixed solution, after stirring for 3 hours (the reaction temperature of the mixture during the titration and stirring process was controlled at 25(±1)°C), place it in a constant temperature oven at 65°C for aging for 4 days. After the product was cooled to room temperature, it was centrifuged, and the precipitate was washed with distilled water until there was no Cl - Existence (AgNO 3 inspection), then dried at 65°C, passed through 100 mesh and stored in polyethylene bottles for later use.

[0031] 2) Purification of natural montmorillonite: Add 200g of natural montmorillonite (BN-4) to...

Embodiment 2

[0037] Maximum adsorption capacity of phosphorus by montmorillonite-based layered double hydroxide polymeric nanomaterials

[0038] Accurately weigh the above three montmorillonite-based layered double hydroxide polymeric nanomaterials (LDH-M t1 、LDH-M t2 and LDH-M t3 ) 0.1g in a 100mL centrifuge tube, add 25mL of potassium dihydrogen phosphate standard solution of different concentrations (2.5, 5, 10, 20, 50, 100, 150, 200mg·L -1 ), repeated 3 times, constant temperature (200r·min -1 , (25±1)℃) shaking for 24h, 4500r·min -1 Centrifuge for 8 minutes, pass through a 0.22 μm filter membrane, measure the content of phosphorus by molybdenum blue colorimetry, and draw the phosphorus isotherm adsorption curve ( image 3 ). The layered double hydroxide increases the phosphorus adsorption capacity of montmorillonite, and the adsorption amount of phosphorus increases with the increase of the layered double hydroxide amount. When the initial concentration of phosphorus is 200mg·L ...

Embodiment 3

[0041] Phosphorus Kinetic Curves of Montmorillonite-Based Layered Double Hydroxide Polymeric Nanomaterials

[0042] Accurately weigh the above materials (LDH-M t1 、LDH-M t2 and LDH-M t3 )0.5g in a 100mL centrifuge tube, add 25mL50mg·L -1 Potassium dihydrogen phosphate standard solution, constant temperature (200r min -1 , (25±1)°C) shaking for 1min, 2min, 5min, 10min, 20min, 30min, 1, 2, 3, 4, 6, 12, 24h, 48h, 4500r·min -1 Centrifuge for 8 minutes, pass through a 0.22 μm filter membrane, measure the content of phosphorus by molybdenum blue colorimetry, and draw the phosphorus adsorption kinetic curve ( Figure 4 ). The time required for the adsorption process of polymeric nanomaterials to phosphorus to reach equilibrium is relatively short, and more than 90% of phosphorus is basically adsorbed within 1 hour. The adsorption process of phosphorus may be chemical adsorption including valence bond binding force.

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Abstract

The present invention discloses a montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof, wherein layered double hydroxide LDH and purified nature montmorillonite are completely dispersed to prepare a suspension, and mixing, stirring, centrifugation, water washing and drying are performed to obtain the montmorillonite-based layered double hydroxide polymerization nanometer material, wherein the LDH grains in the material can be loaded on the outer surface of the montmorillonite, and can further enter the interlayer of the montmorillonite to produce the interaction. According to the present invention, the positively charged LDH and the negatively charged montmorillonite are subjected to flocculation to prepare the montmorillonite-based layered double hydroxide polymerization nanometer material, and the montmorillonite-based layered double hydroxide polymerization nanometer material has high phosphorus adsorption capacity and good water stability, wherein the adsorption capacity can achieve 23.3 mg / g and is about 13-23 times the adsorption capacity of the original soil.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials, and in particular relates to a montmorillonite-based layered double hydroxide polymerized nanomaterial, its preparation and application, and is applied to water body pollution control. Background technique [0002] Layered double hydroxide (LDH) is a positively charged layered material that can undergo intercalation reactions. It has many advantages in the preparation of sandwich nanomaterials, such as adjustable composition and layer charge density, and the layer is a Wrinkled multi-faceted layer with more extensibility than other 2:1 phyllosilicates. The unit charge area of ​​LDH is In general, 2D hosts with low exchange capacity (e.g., low layer charge density) are more likely to form nanocomposites, and the interface state of the two components has a significant impact on the properties of the resulting materials. [0003] Although there are many studies on the adsorption properties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F1/52
Inventor 干方群沈培友杭小帅唐荣秦品珠马毅杰
Owner THE CITY VOCATIONAL COLLEGE OF JIANGSU
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