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A modified water-absorbing bead nanocomposite material and its preparation method and application

A composite material and nano-bead technology, applied in chemical instruments and methods, other chemical processes, restoration of polluted soil, etc., can solve the problems of low removal efficiency of heavy metals, large number of atoms occupied by the surface, large specific surface area, etc., and achieve a solution Not suitable for recycling and easy to reunite, good water absorption, simple preparation method

Active Publication Date: 2021-05-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-FeS is amorphous, with small particle size, large specific surface area, large number of atoms on the surface, and high treatment efficiency for heavy metals. However, nano-FeS is very easy to aggregate, the activity is reduced, and the removal efficiency of heavy metals is reduced.
[0003] The existing technology also tries to solve the problem of nanoparticle agglomeration through different methods. For example, in the patent CN103725290A, it is mentioned that the iron salt is loaded with a water-retaining agent, and the nano-zero-valent iron is prepared by reducing the strong reducing agent sodium borohydride. In the application, zero-valent iron and Oxygen reacts to generate highly active iron (hydroxide) oxides to achieve the adsorption of heavy metals. This method requires the use of a strong reducing agent, sodium borohydride, which is costly and complicated. It relies purely on nanoparticle adsorption and has limited sites.

Method used

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  • A modified water-absorbing bead nanocomposite material and its preparation method and application
  • A modified water-absorbing bead nanocomposite material and its preparation method and application
  • A modified water-absorbing bead nanocomposite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Soak 5g of water-absorbing beads (purchased in Shuyang Tianba Landscaping Co., Ltd., a transparent water-absorbing bead product) in 0.2mol / L ferrous chloride solution for 6h, stir constantly, and pass nitrogen in the reaction solution throughout the whole process, and then Rinse the water-absorbing beads with deionized water (the water used needs to be ventilated with nitrogen for at least 10 minutes to remove the oxygen inside), put it in the refrigerator at -20°C for 12 hours, and then freeze-dry for 12 hours;

[0040] (2) Put the water-absorbing beads obtained in (1) into a 0.2mol / L sodium sulfide solution and soak for 12 hours, stir constantly, pass nitrogen gas throughout the whole process, and then use deionized water (the water used needs to pass nitrogen gas for at least 10 minutes to remove the inner Oxygen) flushing, put into the refrigerator at -20°C for 12 hours, and then freeze-dry for 12 hours to obtain the modified water-absorbing bead nanocomposite. ...

Embodiment 2

[0044] (1) Soak 20g of water-absorbing beads in 1mol / L ferrous chloride solution for 12 hours, stir constantly, pass nitrogen throughout the process, and then use deionized water (the water used needs to pass nitrogen for at least 10 minutes to remove the oxygen inside) Rinse the water-absorbing beads, put them in the refrigerator at -20°C for 2 hours, and then freeze-dry for 24 hours;

[0045] (2) Soak the water-absorbing beads obtained in (1) in 1mol / L sodium sulfide solution for 24 hours, stir continuously, pass nitrogen throughout the process, then rinse with deionized water, put them in the refrigerator at -20°C for 2 hours, and then freeze-dry After 24 hours, the modified water-absorbing bead nanocomposite material can be obtained.

[0046] (3) Repeat steps (1) and (2) once to increase the load.

Embodiment 3

[0048] (1) Soak 10g of water-absorbing beads in 0.5mol / L ferrous sulfate solution for 8 hours, keep stirring, pass nitrogen gas through the reaction solution throughout the process, then rinse the water-absorbing beads with deionized water, put them in the refrigerator for 12 hours at -10°C Afterwards, freeze-dry 18h;

[0049] (2) Soak the water-absorbing beads obtained in (1) in 0.8mol / L sodium sulfide solution for 15 hours, stir continuously, pass nitrogen gas all the way, rinse with deionized water, put in the refrigerator at -10°C for 12 hours, and then freeze After drying for 16 hours, the modified water-absorbing bead nanocomposite material can be obtained.

[0050] (3) Repeat steps (1) and (2) once to increase the load.

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Abstract

The invention provides a modified water-absorbing bead nanocomposite material and its preparation method and application. The common water-absorbing beads on the market are used to expand and shrink through water absorption in a single or step-by-step process, and then synthesized in situ Nano-FeS is loaded, FeS is fixed inside to form active sites, the raw materials are cheap and easy to obtain, and the preparation method is simple. The modified water-absorbing bead nanocomposite material obtained by the preparation method has controllable structure, controllable particle size, is not easy to fall off after being loaded, maintains the same shape of the material, has high strength, is not easy to break, and is convenient to use. The internal space of the modified water-absorbing bead nanocomposite material expands after absorbing water, and the effect of adsorbing and removing heavy metals is obvious. It can simultaneously solve the problems that current nanomaterials are not suitable for recycling and easy to agglomerate, and has a good application prospect in the field of heavy metal treatment.

Description

technical field [0001] The invention belongs to the technical field of modified composite materials, in particular to a modified water-absorbing bead nanocomposite material and its preparation method and application. Background technique [0002] With the rapid development of industrial and agricultural production, the problem of soil heavy metal pollution in my country has become more and more prominent (National Soil Pollution Survey Bulletin, April 17, 2014). Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds, mainly caused by human factors such as mining, waste gas discharge, sewage irrigation, and the use of products with heavy metals exceeding the standard. It exceeds the normal range, directly endangers human health, and leads to deterioration of environmental quality. In this regard, most experts believe that my country's soil heavy metal pollution has entered a period of frequent occurrence, and if it is not treated in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30B09C1/08
CPCB01J20/0229B01J20/0285B09C1/08
Inventor 李永涛刘永林张玉龙王进进张振徐会娟袁钰琪
Owner SOUTH CHINA AGRI UNIV
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