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Preparation method, application and regeneration of xonotlite and natrium-doped xonotlite

A technology of tobermorite and sodium chloride, applied in the field of preparation of tobermorite and sodium-doped tobermorite, can solve problems such as limited reserves of natural tobermorite, achieve excellent adsorption capacity and high promotion value , the effect of simple preparation process

Active Publication Date: 2019-03-19
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the rough surface of xonotlite and the development of internal pore structure, some scholars synthesized xonotlite microspheres by hydrothermal method, and tried to remove waste water containing toxic and harmful substances such as heavy metals and organic substances, and achieved good results. , but the reserves of natural xonotlite are limited. With the intensification of heavy metal pollution, it is currently a problem to find materials that can replace natural xonotlite

Method used

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  • Preparation method, application and regeneration of xonotlite and natrium-doped xonotlite
  • Preparation method, application and regeneration of xonotlite and natrium-doped xonotlite
  • Preparation method, application and regeneration of xonotlite and natrium-doped xonotlite

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Experimental program
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Effect test

Embodiment 1

[0042] Preparation of xonotlite:

[0043] (1) Collect discarded egg shells, wash, remove the film, dry, crush, place in a muffle furnace for calcination at 800-900°C for 3.5-5 hours, then cool to room temperature in a desiccator to obtain CaO powder, pass through a 200-mesh sieve Back sealed for use;

[0044] (2) Weigh the CaO in step (1) and place it in a beaker, add deionized water, stir and react for 20-40 minutes, and then statically age for 4-6 hours to obtain Ca(OH) 2 ;

[0045] (3) Ca(OH) obtained in step (2) 2 and SiO 2 Mix evenly with a molar ratio of Ca / Si of 1:1, put it into a conical flask, add deionized water, seal it, and sonicate for 50-70 minutes to obtain a mixed solution;

[0046] (4) Move the mixed solution prepared in step (3) into an autoclave, place it in a muffle furnace at 220-250°C for 8-10 hours, and then age it statically for 5-7 hours, then filter it with suction, pickle, Wash with water and dry at 65-75°C for 3-4 hours to obtain xonotlite, den...

Embodiment 2

[0048] Preparation of sodium xonotlite:

[0049] (1) Collect discarded egg shells, wash, remove the film, dry, crush, place in a muffle furnace for calcination at 800-900°C for 3.5-5 hours, then cool to room temperature in a desiccator to obtain CaO powder, pass through a 200-mesh sieve Back sealed for use;

[0050] (2) Weigh the CaO in step (1) and place it in a beaker, add deionized water, stir and react for 20-40 minutes, and then statically age for 4-6 hours to obtain Ca(OH) 2 ;

[0051] (3) Ca(OH) obtained in step (2) 2 and SiO 2 Mix evenly with a molar ratio of Ca / Si of 1:1 and put it into an Erlenmeyer flask, add deionized water and sodium chloride with a weight-to-solid-liquid ratio of 30:1 in sequence, seal it, and sonicate for 50-70 minutes to obtain a mixed solution;

[0052] (4) Move the mixed solution prepared in step (3) into an autoclave, place it in a muffle furnace at 220-250°C for 8-10 hours, and then age it statically for 5-7 hours, then filter it with s...

Embodiment 3

[0055] CSH 0 and NCSH performance measurements:

[0056] 1. Determination of physical properties of materials

[0057] CSH was analyzed by nitrogen adsorption method (BET). 0 、NCSH 1 、NCSH 2 、NCSH 3 and NCSH 4 The specific surface area and pore structure of several samples were characterized, and the results are shown in Table 1.

[0058] Table 1 BET determination data of different types of xonotlite

[0059]

[0060] As can be seen from Table 1, sodium-doped xonotlite (NCSH 1 、NCSH 2 、NCSH 3 and NCSH 4 ) specific surface area is larger than that of pure xonotlite, indicating that xonotlite can properly increase its specific surface area and improve the inter-particle pore structure by adding sodium. When the amount of sodium is added too much, the specific surface area of ​​xonotlite will not increase but will decrease. The reason is that the calcium of xonotlite is saturated by sodium replacement and is limited. At the same time, too much sodium will also prope...

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Abstract

The invention discloses a method for preparing xonotlite and natrium-doped xonotlite serving as porous adsorption function materials by abandoned eggshells. The prepared materials have large specificsurface area and pore volume, meet mesoporous material standards and are adsorption materials with obviously concave-convex surfaces and porous development capacity. 100mL of 120mg / L wastewater containing Cd<2+> is adsorbed by 0.12g of CSH0 and NCSH2, removal rates reach up to 81.68% and 98.01% under the optimization condition of pH=6, T=313K and t=45min, equilibrium adsorption capacity reaches upto 81.68mg / g and 98.01mg / g, the xonotlite and the natrium-doped xonotlite have high adsorption performances, the surface and the porous structure of the xonotlite can be improved by doping natrium, and the adsorption performances can be improved. Adsorption behaviors of the xonotlite and the natrium-doped xonotlite are described by a Langmuir equation, the saturated adsorption capacity of the materials are obviously superior to that of other materials, the used xonotlite and natrium-doped xonotlite can be regenerated, and the repeatedly used and regenerated xonotlite still has excellent adsorption capacity. Natural waste resources are sufficiently used, the preparation process is simple and convenient, and products have good performances and high popularization values.

Description

technical field [0001] The invention relates to the technical field of chemical materials, and more specifically relates to a preparation method, application and regeneration of xonotlite and sodium-doped xonotlite. Background technique [0002] A large amount of industrial wastewater containing toxic and harmful pollutants such as heavy metals and their complexes has been discharged, which has led to further deterioration of the ecological environment. In some areas, surface and groundwater bodies have been polluted to varying degrees, seriously endangering the physical and mental health of local people. In order to effectively eliminate such The pollution of toxic and harmful substances consumes a large amount of treatment agents and adsorption materials every year. Most of the materials used to treat such toxic and harmful wastewater are zeolite, kaolin, bentonite, clay, montmorillonite, hydrotalcite, diatomaceous earth, seawater, etc. Paool, etc. are almost derived from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24B01J20/10B01J20/34B01J20/30C02F1/28C02F101/20
CPCB01J20/10C01B33/24C02F1/281B01J20/3475C02F2101/20C01P2004/03B01J20/046B01J2220/4881B01J2220/4806
Inventor 唐文清曾荣英冯泳兰康卓
Owner HENGYANG NORMAL UNIV
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