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Cement-based adsorbent, and preparation method and application thereof

An adsorbent and cement-based technology, applied in the field of adsorbent preparation, can solve the problems of general adsorption effect, long adsorption time of heavy metal ions, restrictions on application and promotion, etc., and achieve the effect of low cost

Inactive Publication Date: 2019-12-13
CITY COLLEGE OF DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the adsorption time of cement to heavy metal ions is too long, the adsorption effect is general, which restricts its application and promotion.

Method used

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  • Cement-based adsorbent, and preparation method and application thereof
  • Cement-based adsorbent, and preparation method and application thereof
  • Cement-based adsorbent, and preparation method and application thereof

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preparation example Construction

[0039] The present invention also provides a preparation method of the cement-based adsorbent described in the above technical solution, comprising the following steps:

[0040] Combine fly ash powder with Ca(OH) 2 The solutions are mixed to carry out modification reaction to obtain modified fly ash;

[0041] After mixing the modified fly ash, graphene oxide powder, polycarboxylate water reducer, cement, foaming agent and water, curing is carried out to obtain the cement-based adsorbent.

[0042] In the present invention, the fly ash powder is preferably ball-milled with Ca(OH) 2 The solution is mixed. In the present invention, the ball milling is preferably carried out in a ball mill, the speed of the ball milling is preferably 250-350r / min, more preferably 300r / min; the time of the ball milling is preferably 2h, and the particle size after the ball milling is Preferably it is 80 mesh. In the present invention, there is no special limitation on the specific operation of t...

Embodiment 1

[0059] The fly ash was ball milled on a ball mill at a speed of 300r / min for 2h and passed through an 80-mesh sieve to obtain a fly ash powder; 7g of the fly ash powder was mixed with a mass concentration of 2moL / LCa(OH) 2 The solution is 1g: 6mL according to the dosage ratio, stirred in a 90°C water bath at a speed of 300r / min for 30min, then centrifuged, washed until neutral, dried, and ground through a 100-mesh sieve to obtain modified fly ash;

[0060] Weigh 0.5g graphene oxide, add it into 8mL distilled water, and ultrasonicate for 2 hours to obtain a uniformly dispersed graphene oxide suspension, mix it with 1mL PCAQ8081 polycarboxylate superplasticizer, and stir at 40°C and 200r / min 20min, obtain graphene oxide / polycarboxylate superplasticizer mixed solution;

[0061] Weigh 10g of cement and the obtained modified fly ash in a stirrer, add 4.5mL graphene oxide / polycarboxylate superplasticizer mixed solution and 0.5mL sodium dodecylbenzene sulfonate foaming agent successi...

Embodiment 2

[0068] The fly ash was ball milled on a ball mill at a speed of 300r / min for 2h and passed through an 80-mesh sieve to obtain fly ash powder; 2 The solution is 1g: 5mL according to the dosage ratio, stirred in a 90°C water bath at a speed of 300r / min for 30min, then centrifuged, washed until neutral, dried, and ground through a 100-mesh sieve to obtain modified fly ash;

[0069]Weigh 1g of graphene oxide, add it into 10mL of distilled water, and ultrasonicate for 2 hours to obtain a uniformly dispersed graphene oxide suspension, mix it with 2mL of PCAQ8081 polycarboxylate superplasticizer, and stir for 20min at 30°C and 200r / min. Obtain graphene oxide / polycarboxylate superplasticizer mixed solution;

[0070] Weigh 10g of cement and the obtained modified fly ash in a stirrer, add 7mL graphene oxide / polycarboxylate superplasticizer mixed solution and 0.6mL sodium dodecylbenzene sulfonate foaming agent in turn, at 30r / At a stirring speed of 1 min, stir for 1 min, then add the r...

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Abstract

The invention provides a cement-based adsorbent, and a preparation method and application thereof, belonging to the field of adsorbent preparation. The cement-based adsorbent provided by the inventionis prepared from the following components in parts by weight: 8-15 parts of cement, 5-12 parts of fly ash powder, 1.5-16 parts of calcium hydroxide, 0.1-2 parts of graphene oxide powder, 0.5-3 partsof a polycarboxylate superplasticizer, 0.3-1 part of a foaming agent and 25-87 parts of water. The surface of added graphene oxide contains a large number of oxygen-containing functional groups, so the graphene oxide can be complexed with heavy metal ions; an added calcium hydroxide solution can modify fly ash, so the surface activity of the fly ash is increased and the adsorption efficiency of the cement-based adsorbent to high-concentration heavy metal ions is improved; and the modified fly ash and graphene oxide can improve the pore structure of the cement-based adsorbent, reduce the porosity of the cement-based adsorbent and effectively enhance the strength, toughness and durability of the cement-based adsorbent.

Description

technical field [0001] The invention relates to the field of preparation of adsorbents, in particular to a cement-based adhesive and its preparation method and application. Background technique [0002] Copper ion is a common heavy metal pollutant, which mainly comes from the wastewater of metal ore mining, smelting and metal processing, machine manufacturing, organic synthesis and other industries. Copper ion pollution is generally characterized by high toxicity, non-degradable, long-term persistence, and can be bio-accumulated, and finally enter human organs through the food chain. Copper is an essential element required by the human body, but once it exceeds 100 to 150 times the amount required by the human body, it will cause liver tissue necrosis, kidney damage, hemolysis, etc. Therefore, the control of copper ion pollution has become more and more important. [0003] Cement has the characteristics of low cost and high durability, and is widely used in construction pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/103B01J20/20B01J20/08C02F1/281C02F2101/20
Inventor 方伟成肖红飞梁逸扬黄祈栋
Owner CITY COLLEGE OF DONGGUAN UNIV OF TECH
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