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Geopolymer-based composition, and preparation method and application thereof

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 secondary pollution, low efficiency of heavy metal wastewater, etc., and achieve enhanced adsorption capacity , short preparation time, high temperature performance and mechanical properties

Active Publication Date: 2019-09-20
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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  • Geopolymer-based composition, and preparation method and application thereof
  • Geopolymer-based composition, and preparation method and application thereof
  • Geopolymer-based composition, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

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

[0040] Weigh 6g of metakaolin, and analyze by weight, its composition includes: 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 0.89g of sodium hydroxide, 2.22g of sodium metaaluminate and 13.39g of sodium metasilicate pentahydrate, and dissolve them in 250mL of water to obtain an alkaline activator.

[0042] Add 50mL alkaline activator respectively in 4 Erlenmeyer flasks, weigh 0, 0.5, 1, 1.5g cetyltrimethylammonium bromide (CTAB for short) respectively and add in 4 Erlenmeyer flasks to dissolve, The metakaolin was then evenly divided into 4 parts, that is, 1.5 g of each part was poured into the Erlenmeyer flask. Shake 4 Erlenmeyer flasks at 35° C. and 180 rpm for 24 hours, wash with water, centrifuge and dry to obtain a geopolymer-based comp...

Embodiment 2

[0044] This example is a specific example of determining the adsorption capacity of the geopolymer-based composition in 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 waste water containing Cr(VI) at a concentration of 100 mg / L. After adsorption at 30°C and 180 rpm for 4 hours, the supernatant was taken , and the concentration of Cr(VI) in the supernatant was determined using a flame atomic absorption spectrophotometer.

[0046] figure 1 It is a diagram of the adsorption capacity of the geopolymer-based composition in Example 1 of the present invention to Cr(VI) in wastewater. Such as figure 1 As shown, the adsorption amount of Cr(Ⅵ) on the geopolymer-based composition modified by CTAB is significantly larger than that of the geopolymer-based composition without CTAB, and the geopolymer-based composition modified by CTAB showed a good adsorption effect.

Embodiment 3

[0048] This example is a specific example of determining the adsorption capacity of the geopolymer-based composition in 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) at a concentration of 100 mg / L. After adsorption at 30 ° C and 180 rpm for 4 h, the supernatant was taken The concentration of Cu(II) in the supernatant was measured using a flame atomic absorption spectrophotometer.

[0050] figure 2 It is a diagram of the adsorption capacity of the geopolymer-based composition in Example 1 of the present invention to Cu(II) in wastewater. Such as figure 2 As shown, the adsorption amount of Cu(II) on the geopolymer-based composition modified by CTAB is slightly reduced compared with the product without addition, which is due to the use of potassium dichromate as the source of Cr(VI) in the solution. , the presence of potassium ions will inhibit th...

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Abstract

The invention relates to the technical field of pollution treatment and wastewater treatment, in particular to a geopolymer-based composition, and a preparation method and application thereof. The geopolymer-based composition comprises the following precursor components: metakaolin, an alkaline activator and a surfactant. The geopolymer-based composition is green, environmentally friendly and recyclable; through surfactant modification, the adsorptivity of the geopolymer-based composition to heavy metal anions is improved, and the adsorptivity to heavy metal cations is substantially unchanged.

Description

technical field [0001] 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. Background technique [0002] 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. Heavy metals refer to metals with a specific gravity greater than 5, including gold, silver, copper, iron, lead, etc. Heavy metals can strongly interact with proteins and various enzymes in the human body, making them inactive, and may also accumulate in certain organs of the human body. If the human body exceeds the tolerance limit, it will cause acute poisoning, Subacute poisoning, chronic poisoning, etc., will cause great harm to the human body. For example, public hazards such as Minamata...

Claims

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Application Information

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Patent Type & Authority Applications(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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