Preparation method and application of a xonotlite and sodium-doped xonotlite and regeneration thereof

A technology of xonotlite and sodium chloride, which is applied in the field of preparation of xonotlite and sodium-doped xonotlite, which can solve the problems of limited reserves of natural xonotlite, achieve excellent adsorption capacity, and improve adsorption performance , the effect of large specific surface area

Active Publication Date: 2022-04-05
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 and application of a xonotlite and sodium-doped xonotlite and regeneration thereof
  • Preparation method and application of a xonotlite and sodium-doped xonotlite and regeneration thereof
  • Preparation method and application of a xonotlite and sodium-doped xonotlite and regeneration thereof

Examples

Experimental program
Comparison scheme
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 porous adsorption functional materials xonotlite and sodium-doped xonotlite by using discarded eggshells. The prepared material has large specific surface area and pore volume, meets the standard of mesoporous materials, and is a kind of Adsorption material with obvious uneven surface and developed pores; use 0.12g CSH 0 and NCSH 2 Adsorb 100mL 120mg / L containing Cd 2+ Wastewater, under the optimized conditions of pH=6, T=313K and t=45min, the removal rate is as high as 81.68% and 98.01%, respectively, and the equilibrium adsorption capacity is as high as 81.68mg / g and 98.01mg / g, both of which have high Adsorption performance, and adding sodium can improve the surface and pore structure of xonotlite, which is beneficial to improve the adsorption performance; through the Langmuir equation to describe the adsorption behavior of the two, the saturated adsorption capacity is obviously better than other materials; after use xonotlite and Sodium-doped xonotlite can be regenerated, and the regenerated xonotlite still has excellent adsorption capacity after repeated use; the invention makes full use of natural waste resources, and the preparation process is simple, and the product has high performance and has High promotional value.

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 Patents(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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