Nano manganese oxide composite material as well as preparation method and application thereof in anion pollutant processing

A composite material and oxide technology, used in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of low zero charge point of manganese oxide and difficulty in efficiently removing anionic pollutants. , to improve the application performance, the adsorption performance will not decline, and the pressure drop will be reduced.

Inactive Publication Date: 2013-04-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention mainly aims at the problem that manganese oxide has a low zero charge point and it is difficult to efficiently remove anionic pollutants such as phosphate, arsenate or antimonate in a neutral water environment, and provides a nano-manganese oxide composite material and a preparation method And its application in the treatment of anionic pollutants. It loads manganese oxides on the surface of nanoporous materials with positively charged functional groups to regulate the surface electrical properties of manganese oxides and improve its adsorption performance for anionic pollutants.

Method used

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  • Nano manganese oxide composite material as well as preparation method and application thereof in anion pollutant processing
  • Nano manganese oxide composite material as well as preparation method and application thereof in anion pollutant processing
  • Nano manganese oxide composite material as well as preparation method and application thereof in anion pollutant processing

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In this example 1, the nano-manganese oxide composite material HMO-201 was obtained by using strongly basic anion exchange resin D201 to immobilize hydrated manganese oxide particles, with an average particle size of 0.8 mm and a specific surface area of ​​10 m 2 / g, pore volume 0.05 cm 3 / g, the manganese loading is 20%, and the zero charge point is 10.5; the particle size of the hydrated manganese oxide loaded is 20nm, and the crystal form is amorphous.

[0027] The specific preparation steps of the above-mentioned nano-manganese oxide composite material are as follows:

[0028] (1) 1.58g KMnO 4 Dissolve in 200mL water to obtain solution A, in which MnO 4 - The concentration is 0.05M;

[0029] (2) The mixture of 150mL absolute ethanol and 50mL water is solution B;

[0030] (3) Weigh 10g of D201 resin into a three-necked flask, add solution A to it, and stir at 500r / min for 10h at 25°C to make MnO 4 - Fully exchanged to the surface and interior of the resin;

[...

Embodiment 2

[0035] In Example 2, the nano-manganese oxide composite material HMO-201 was obtained by using strongly basic anion exchange resin D201 to immobilize hydrated manganese oxide particles, with an average particle size of 0.5 mm and a specific surface area of ​​5 m 2 / g, pore volume 0.05cm 3 / g, manganese load 20%, zero charge point is 10.96; the particle size of hydrated manganese oxide loaded is 2nm, and the crystal form is amorphous (such as image 3 shown).

[0036] The specific preparation steps of the above-mentioned nano-manganese oxide composite material are as follows:

[0037] (1) Add 0.158g KMnO 4 Dissolve in 100mL water to obtain solution A, in which MnO 4 - The concentration is 0.01M;

[0038] (2) The mixture of 25mL propanol and 25mL water is solution B;

[0039] (3) Weigh 10g of D201 resin into a three-necked flask, add solution A to it, and stir at 300r / min for 10h at 5°C to make MnO 4 - Fully exchanged to the surface and interior of the resin;

[0040] ...

Embodiment 3

[0044] In Example 3, the nano-manganese oxide composite material HMO-201 was obtained by using strongly basic anion exchange resin D201 to immobilize hydrated manganese oxide particles, with an average particle size of 1.5 mm and a specific surface area of ​​30 m 2 / g, pore volume 0.005cm 3 / g, the manganese load is 40%, and the zero charge point is 10.6; the particle size of the hydrated manganese oxide loaded is 50nm, and the crystal form is amorphous.

[0045] The specific preparation steps of the above-mentioned nano-manganese oxide composite material are as follows:

[0046] (1) 14.22g KMnO 4 Dissolve in 300mL water to obtain solution A, in which MnO 4 - The concentration is 0.3M;

[0047] (2) The mixture of 100mL absolute ethanol and 10mL water is solution B;

[0048] (3) Weigh 10g of D201 resin into a three-necked flask, add solution A to it, and stir at 600r / min for 16h at 5°C to make MnO 4 - Fully exchanged to the surface and interior of the resin;

[0049] (...

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Abstract

The invention discloses a nano manganese oxide composite material as well as a preparation method and an application of the composite material in anion pollutant processing, and belongs to the field of a nano composite material of an environmental function. The composite material is formed by utilizing an anion exchange resin to immobilize hydrated manganese oxide particles, and the loading manganese amount is 2-40%. The anion exchange resin is a strongly basic anion exchange resin of a functional group of positive charge. The particle diameter of the hydrated manganese oxide particle is 2-50 nm. The average particle diameter of the composite material is 0.5-1.5 mm, the specific surface area of the composite material is 5-30 m<2>/g, the pore volume of the composite material is 0.005-0.4 cm<3>/g, and the zero charge point of the composite material is 9.5-11. The manganese oxide is loaded on the nanoporous material of which the surface is bound with the functional group of positive charge, so that the surface electrical property of the manganese oxide is controlled, and the adsorptive property of the composite material to the anion pollutants is improved.

Description

technical field [0001] The invention belongs to the field of environmental functional nano-composite materials, and more specifically relates to a nano-manganese oxide composite material for deep removal of anions such as phosphorus, a preparation method and an application in anion pollutant treatment. Background technique [0002] As a low-cost and environmentally friendly amphoteric adsorbent, manganese oxide has high adsorption selectivity to anionic pollutants such as phosphorus, arsenic, selenium, and antimony in water, and is an excellent environmental functional material (Jun'ichi Watanabe et al . Chem. Geol. (2012); Xiangqin Wang et al . Chemie der Erde (2012)). However, manganese oxides generally exist in powder state particles, and there are technical bottlenecks such as large pressure head loss and difficult separation in the actual water treatment process. However, preparing composite materials by loading them on large-particle nanoporous carriers such as activa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/58
Inventor 潘丙才韩飞超李旭春何锴吕路张炜铭
Owner NANJING UNIV
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