Functionalized hollow mesoporous silica nanospheres and its preparation method and application in adsorption of heavy metal ions

A technology of mesoporous silica and nano-microspheres, used in chemical instruments and methods, alkali metal compounds, adsorption water/sewage treatment, etc., can solve the problem of long time required for adsorption equilibrium, unfavorable repeated use, and small specific surface area. and other problems, to achieve the effect of large industrial application potential, easy separation and recycling, and large specific surface area

Active Publication Date: 2020-11-17
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used heavy metal ion adsorbents are organic polymer adsorption materials, such as polystyrene-based resins, chitosan, polyaniline, etc., but the common problems of organic polymer adsorption materials are insufficient strength and poor dispersion in water. , not conducive to repeated use
Organic-inorganic hybrid materials can fully improve these deficiencies of organic polymer adsorption materials; however, the existing hybrid materials have small specific surface area, high density, long time for adsorption equilibrium, and only adsorb certain heavy metals.

Method used

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  • Functionalized hollow mesoporous silica nanospheres and its preparation method and application in adsorption of heavy metal ions
  • Functionalized hollow mesoporous silica nanospheres and its preparation method and application in adsorption of heavy metal ions
  • Functionalized hollow mesoporous silica nanospheres and its preparation method and application in adsorption of heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of functionalized hollow mesoporous silica nanosphere heavy metal ion adsorbent

[0034] (1) Hollow mesoporous SiO 2Amino modification of the surface of nanospheres

[0035] 6 g of hollow mesoporous 1500 nm SiO 2 Nanospheres (with a specific surface area of ​​1440 m 2 / g, with a pore size of 3 nm) was uniformly dispersed in 300 mL of anhydrous toluene by ultrasonication, and 6 g of 3-aminopropyltriethoxysilane coupling agent (KH550) was slowly added dropwise, stirred at room temperature for 2 h, and then placed in N 2 Refluxed in the atmosphere for 18 h, the solid obtained by centrifugation was dispersed in absolute ethanol, washed three times, and then dried in vacuum to obtain modified hollow mesoporous silica nanospheres, which were denoted as hollow mesoporous SiO2. 2 -NH 2 Nanospheres, referred to as SiO 2 -NH 2 nanospheres;

[0036] (2) Hollow mesoporous SiO 2 - Preparation of IDA nanospheres

[0037] 6 g of hollow mesoporous SiO 2...

Embodiment 2

[0063] The preparation method of the functionalized hollow mesoporous silica nanosphere heavy metal ion adsorbent as described in Example 1, the difference is that the hollow mesoporous SiO used in step (1) 2 The particle size of the nanosphere is 200nm (the specific surface area is 680 m 2 / g, with a pore size of 1.1 nm).

[0064] After testing, the saturated adsorption capacities (mg / g) of the functionalized hollow mesoporous silica nanospheres for copper, nickel, cadmium, and lead were 126.2, 121.2, 129.1, and 125.1, respectively; 2+ 、Ni 2+ 、Cd 2+ Concentration (mg L -1 ) were 0.094, 0.015, 0.091, respectively, and the calcium and magnesium ions were almost unchanged; after desorption and re-adsorption with hydrochloric acid for 5 cycles, the adsorption performance for copper and cadmium still maintained high, reaching more than 96% of the first adsorption, indicating that the material It has good stability and can be recycled.

Embodiment 3

[0066] The preparation method of the functionalized hollow mesoporous silica nanosphere heavy metal ion adsorbent as described in Example 1, the difference is that the hollow mesoporous SiO used in step (1) 2 The particle size of the nanosphere is 500nm (the specific surface area is 920 m 2 / g, with a pore size of 1.9 nm).

[0067] After testing, the saturated adsorption capacities (mg / g) of the functionalized hollow mesoporous silica nanospheres on copper, nickel, cadmium, and lead were 125.4, 120.6, 129.6, and 124.3, respectively; 2+ 、Ni 2+ 、Cd 2+ Concentration (mg L -1 ) were 0.091, 0.018, and 0.090, respectively, and there was almost no change in calcium and magnesium ions; after desorption and re-adsorption with hydrochloric acid for 5 cycles, it still maintained a high adsorption performance for copper and cadmium, reaching more than 96% of the first adsorption, indicating that the material It has good stability and can be recycled.

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Abstract

The invention provides a functionalized hollow mesoporous silicon dioxide nanometer sphere, a preparation method thereof and an application in absorbing heavy metal ions. The hollow mesoporous silica nanospheres are used as raw materials, and then aminated with a silane coupling agent, and then the aminated nano-silica is combined with sodium chloroacetate to make the nano-silica grafted with the ability to adsorb metal ions bidentate functional groups. The inorganic-organic hybrid material has both the large specific surface area of ​​the hollow mesoporous nano-silica microspheres, the hollow cavity and the abundant adsorption sites in the organic side chains. Effective separation of heavy metal ions such as Cu 2+ 、Cd 2+ 、Ni 2+ , Pb 2+ Wait. The raw material of the functionalized hollow mesoporous silica prepared by the invention is cheap and easy to obtain, the process is simple, the synthesis cost is low, and the invention has great application potential in the field of treating heavy metal ion pollution in water.

Description

technical field [0001] The invention belongs to the technical field of inorganic-organic hybrid materials, and relates to a functionalized hollow mesoporous silicon dioxide nanometer sphere, a preparation method thereof and an application in absorbing heavy metal ions. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. There are about 45 kinds of heavy metals that pollute water quality in nature, but in environmental science, people usually pay attention to several heavy metals with high toxicity, such as Hg, Cd, Pb, Cr, Cu, Co, Ni, etc. The sources of heavy metal pollutants in water bodies are very extensive, the most important being the waste and sewage discharged by industrial and mining enterprises. Due to the large quantity and wide distribution of pollutants discharged by these factories, the polluted area is very large, difficult to control, and seriously harmful. Heavy metals can strongly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/103B01J20/22B01J20/28021B01J20/28064B01J20/28066B01J2220/4806B01J2220/4812C02F1/28C02F1/281C02F1/285C02F2101/20
Inventor 路建美徐庆锋
Owner SUZHOU UNIV
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