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Preparation method and application of magnetic organic modified nano adsorption material

A nano-adsorption material and magnetic technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, inorganic chemistry, etc., can solve the problems of the ability to adsorb heavy metals needs to be strengthened, inconvenient to recycle, etc., to achieve rich raw materials, high adsorption performance, The effect of pore structure development

Active Publication Date: 2019-06-25
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xonotlite has obvious advantages in the treatment of heavy metal wastewater due to its large specific surface area and adsorption capacity, but the existing xonotlite [Ca6Si6O17(OH)2] is not easy to recycle, and the ability to adsorb heavy metals remains to be seen. strengthen

Method used

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  • Preparation method and application of magnetic organic modified nano adsorption material
  • Preparation method and application of magnetic organic modified nano adsorption material
  • Preparation method and application of magnetic organic modified nano adsorption material

Examples

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Embodiment 1

[0032] (1) Magnetic Fe 3 o 4 preparation of

[0033] Weigh 6.88g of sodium citrate and dissolve it in 160mL of deoxygenated water, then quickly add 2g of FeCl 2 4H 2 O, 1gFeCl 3 ·6H 2 O, immediately seal with plastic wrap, and add 160ml of 2mol / L sodium hydroxide solution without stirring, let it stand for 3-4 hours, then seal and heat to boiling, after cooling, suction filter and dry to obtain Fe 3 o 4 particles.

[0034] (2) Preparation of xonotlite adsorption material

[0035] Soak discarded eggshells in tap water for 2 to 3 hours, clean them, add them to a 5% sodium hydroxide solution and heat to 95°C to remove the inner membrane in the eggshell, and remove the eggshell and sodium hydroxide solution. The mass ratio is 1:2, then washed with distilled water, dried, and crushed into powder with a grinder to obtain fresh CaO, which is sealed for future use. Weigh 4g of freshly prepared CaO, add 40ml of 90°C deionized water, and react for 30min under the stirring of a ...

Embodiment 2

[0042]The application of the magnetic organically modified nano-adsorption material of a kind of embodiment 1 in removing the cadmium-containing waste water of different pH, concrete application method is:

[0043] Take 6 parts of Cd with a concentration of 25mg / L 2+ 100mL of simulated wastewater solution is placed in a 250mL conical flask, and the xonotlite S1 prepared by step (2) in Example 1, the magnetic organically modified calcium silicate prepared by step (4) are added in each conical flask Stone S2 (added at 1g / L), use 0.1mol / L HCl and 0.1mol / L NaOH to adjust the pH to 1, 2, 3, 4, 5, 6 respectively, control the temperature to 30°C, and shake at a speed of 150r / min , placed in a water bath constant temperature oscillator for 60 minutes, left to stand for 10 minutes, filtered, and the filtrate was taken to measure the residual Cd 2+ concentration. The measurement results are attached figure 2 : Compared with unmodified xonotlite, the magnetic organically modified nan...

Embodiment 3

[0045] An application of the magnetic organically modified nano-adsorption material of Embodiment 1 in removing cadmium-containing wastewater, the specific application method is:

[0046] The magnetic organically modified nano-adsorption material of embodiment 1 is added to pH value 6 by 1g / L, Cd 2+ In the cadmium-containing wastewater with a concentration of 25mg / L, set the temperature at 303K, 313K, 323K, and oscillate for 90 minutes in a water bath constant temperature oscillator with an oscillation speed of 150r / min. After the start of constant temperature oscillation adsorption, 15min, 30min, 45min, 60min, and 75min respectively , Detect the concentration of cadmium in cadmium-containing wastewater for 90 minutes, and calculate the adsorption rate. Test results such as image 3 Shown: After 45 minutes of adsorption, the adsorption basically reached equilibrium, and the higher the temperature, the lower the removal rate.

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Abstract

The invention discloses a preparation method and an application of a magnetic organic modified nano adsorption material. The method comprises the following steps: performing a reaction on ferrous chloride and ferric chloride in a sodium citrate solution to prepare magnetic Fe3O4; secondly, with calcined waste egg shells as a calcium source, adding SiO2 powder, and with NH4HCO3 as a foaming agent,carrying out hydrothermal synthesis to prepare a magnetic nano-adsorption material xonotlite; and preparing the amino-functionalized novel magnetic organic modified nano-adsorption material with bridging molecules. The raw materials are derived from domestic waste, so that the method is low in cost; meanwhile, the prepared material is applied to water body heavy metal ion treatment and has the advantages of low cost and good effect.

Description

[0001] The invention belongs to the field of sewage treatment, in particular to a preparation method and application of a magnetic recyclable adsorbent. Background technique [0002] Heavy metals mainly refer to mercury, chromium, lead, cadmium, zinc, cobalt, copper and manganese, etc. A large number of industries such as electroplating, metal processing, and tanning produce a large amount of wastewater containing heavy metals. These heavy metals are relatively stable and easy to accumulate through the food chain, posing a serious threat to organisms and human health. In order to avoid the pollution of heavy metals to water bodies, seeking efficient adsorbents for sewage purification has become a current research hotspot. [0003] Xonotlite [Ca6Si6O17(OH)2] is a good thermal insulation material, widely used in mining, electric power, construction and other industries. Xonotlite has obvious advantages in the treatment of heavy metal wastewater due to its large specific surface...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28C02F1/28B01J20/30C02F101/20
Inventor 周唯刘安民廖可兵陈雪林
Owner HUNAN INST OF TECH
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