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A kind of geopolymer base composition and its preparation method and application

A technology of geopolymers and compositions, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of low efficiency and secondary pollution of heavy metal wastewater, and achieve good recycling Effect of Utilization, Adsorption Increase, High Temperature Performance and Mechanical Properties

Active Publication Date: 2022-03-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a geopolymer-based composition and its preparation method and application, which solves the problems of low efficiency and easy secondary pollution in the treatment of heavy metal wastewater by chemical precipitation

Method used

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  • A kind of geopolymer base composition and its preparation method and application
  • A kind of geopolymer base composition and its preparation method and application
  • A kind of geopolymer base composition and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example is the preparation of a geopolymer-based composition.

[0040] 6g of metakaolin was weighed and analyzed by instrument gravimetric analysis. Its components included: 3.3g SiO 2 , 2.1g Al 2 O 3 , 0.15gFe 2 O 3 , 0.11g CaO, 0.03g MgO, 0.03g second metal oxide (oxide impurities containing manganese oxide, sodium oxide, potassium oxide and rare metal oxide).

[0041] Weigh 0.89 g of sodium hydroxide, 2.22 g of sodium metaaluminate and 13.39 g of sodium metasilicate pentahydrate, and dissolve them in 250 mL of water to obtain an alkaline activator.

[0042] Add 50 mL of alkaline activator to 4 conical flasks respectively, weigh 0, 0.5, 1, 1.5 g of cetyltrimethylammonium bromide (CTAB for short) and add them to 4 conical flasks to dissolve, respectively. Divide the metakaolin into 4 equal parts, that is, pour 1.5 g of each part into the conical flask. Four conical flasks were shaken at 35° C. and 180 rpm for 24 hours, washed with water, centrifuged and dried ...

Embodiment 2

[0044] This example is a specific example for measuring the adsorption capacity of the geopolymer-based composition of Example 1 for Cr(VI) in wastewater.

[0045] In Example 1, 0.05 g of each of the four geopolymer-based compositions was weighed and added to 75 mL of wastewater containing Cr(VI) concentration of 100 mg / L. , the Cr(VI) concentration in the supernatant was measured using a flame atomic absorption spectrophotometer.

[0046] figure 1 It is a graph of the adsorption capacity of the geopolymer-based composition in Example 1 of the present invention to Cr(VI) in wastewater. like figure 1 Compared with the geopolymer-based composition without CTAB, the amount of Cr(VI) adsorbed by the CTAB-modified geopolymer-based composition was significantly increased, and the CTAB-modified geopolymer-based composition showed good adsorption effect.

Embodiment 3

[0048] This example is a specific example for measuring the adsorption capacity of the geopolymer-based composition of Example 1 for Cu(II) in wastewater.

[0049] In Example 1, 0.02 g of each of the 4 geopolymer-based compositions was weighed and added to 50 mL of wastewater containing Cu(II) with a concentration of 100 mg / L. After adsorption at 30 °C and 180 rpm for 4 h, the supernatant was taken The Cu(II) concentration in the supernatant was measured using a flame atomic absorption spectrophotometer.

[0050] figure 2 It is a graph of the adsorption capacity of the geopolymer-based composition in Example 1 of the present invention for Cu(II) in wastewater. like figure 2 As shown, the amount of Cu(II) adsorbed by the CTAB-modified geopolymer-based composition is slightly reduced compared to the non-added product, which is due to the use of potassium dichromate as the source of Cr(VI) in solution , the presence of potassium ions will inhibit the adsorption of geopolymer...

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Abstract

The invention relates to the technical fields of pollution control and waste water treatment, in particular to a geopolymer-based composition and its preparation method and application. The present invention discloses a geopolymer-based composition made from the following precursor components: metakaolin, alkaline activator and surfactant. The geopolymer-based composition is environmentally friendly, recyclable, and reusable. The geopolymer-based composition is modified by a surfactant, so that the geopolymer-based composition has an increased adsorption capacity for heavy metal anions, and the adsorption performance for heavy metal cations is basically unchanged.

Description

technical field [0001] The invention relates to the technical field of pollution control and waste water treatment, in particular to a geopolymer-based composition and a preparation method and application thereof. Background technique [0002] Heavy metal pollution refers to the 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 heavy metal products exceeding the standard. Heavy metals refer to metals with a specific gravity greater than 5, including gold, silver, copper, iron, lead, etc. Heavy metals can interact strongly with proteins and various enzymes in the human body, making them inactive, and may also accumulate in some organs of the human body. Subacute poisoning, chronic poisoning, etc., will cause great harm to the human body. For example, public hazards such as Minamata disease (mercury pollution) and bone pain disease (cadmium pollution) in Japan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F1/42C02F101/20C02F101/22
CPCB01J20/16B01J20/103B01J20/08B01J20/06B01J20/041B01J20/10B01J20/04B01J20/22B01J20/28011C02F1/288C02F1/42C02F2101/20C02F2101/22C02F2001/427
Inventor 宋卫锋余泽峰王超李家耀李秋华
Owner GUANGDONG UNIV OF TECH
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