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Hydrated calcium silicate for removing copper ions in wastewater and preparation method thereof

A technology for hydrating calcium silicate hydrate and deionized water, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of high production cost and low removal rate, and achieve low cost, Efficient removal rate and stable removal rate

Active Publication Date: 2022-03-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon is widely used as an adsorbent for heavy metal ions in adsorption methods, but its high production cost and low removal rate limit its wide application.

Method used

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  • Hydrated calcium silicate for removing copper ions in wastewater and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0014] A calcium silicate hydrate that can absorb copper ions in waste water, its raw materials include: calcareous material, siliceous material, and water, wherein the mass ratio (calcium-silicon ratio) of calcareous material and siliceous material is 0.8, Calculate the consumption of calcium acetate, water glass (mass fraction 40%) and water respectively, and accurately weigh for future use. First place calcium acetate in the Erlenmeyer flask, add deionized water to make it completely dissolved; then water glass (mass fraction 40%) is added dropwise to the calcium acetate solution at a constant speed of 1mL / min, with 0.1mol / L Adjust the pH of the solution to 11 with NaOH, keep the temperature at 30°C, stir at a speed of 600rpm to fully react for 2h, keep the temperature in a constant temperature water bath at 30°C for 3d, take out the product, wash it with deionized water several times, and remove the surface The impurity ions were centrifuged and separated at a speed of 500...

Embodiment 2

[0016] A calcium silicate hydrate that can absorb copper ions in waste water, its raw materials include: calcareous material, siliceous material, and water, wherein the mass ratio (calcium-silicon ratio) of the calcareous material to the siliceous material is 1.2, Calculate the consumption of calcium acetate, water glass (mass fraction 40%) and water respectively, and accurately weigh for future use. First place calcium acetate in the Erlenmeyer flask, add deionized water to make it completely dissolved; then water glass (mass fraction 40%) is added dropwise to the calcium acetate solution at a constant speed of 1mL / min, with 0.1mol / L Adjust the pH of the solution to 11 with NaOH, keep the temperature at 30°C, stir at a speed of 600rpm to fully react for 2h, keep the temperature in a constant temperature water bath at 30°C for 3d, take out the product, wash it with deionized water several times, and remove the surface The impurity ions were centrifuged and separated at a speed...

Embodiment 3

[0018] A calcium silicate hydrate that can absorb copper ions in waste water, its raw materials include: calcareous material, siliceous material, and water, wherein the mass ratio (calcium-silicon ratio) of the calcareous material to the siliceous material is 2.0, Calculate the consumption of calcium acetate, water glass (mass fraction 40%) and water respectively, and accurately weigh for future use. First place calcium acetate in the Erlenmeyer flask, add deionized water to make it completely dissolved; then water glass (mass fraction 40%) is added dropwise to the calcium acetate solution at a constant speed of 1mL / min, with 0.1mol / L Adjust the pH of the solution to 11 with NaOH, keep the temperature at 30°C, stir at a speed of 600rpm to fully react for 2h, keep the temperature in a constant temperature water bath at 30°C for 3d, take out the product, wash it with deionized water several times, and remove the surface The impurity ions were centrifuged and separated at a speed...

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Abstract

A calcium silicate hydrate used for removing copper ions in waste water and a preparation method thereof belong to the field of removing heavy metal ions. Calcium acetate and water glass with a mass fraction of 40% were selected as calcium and silicon sources, and calcium silicate hydrate was prepared in one step by hydrothermal synthesis. It is measured that the calcium silicate hydrate prepared by this method has a removal rate of 50-200mg / L copper ion at a speed of 150-400r / min, a temperature of 20-60°C, a pH value of 1-14, and an adsorption time of 30-90min. More than 80%. The present invention selects calcium acetate and water glass with wide sources and low price as reactants, and the prepared calcium silicate hydrate is in an amorphous state, has high purity, large output, and has stable and efficient removal rate of copper ions.

Description

technical field [0001] The invention relates to a preparation method of calcium silicate hydrate, in particular to a calcium silicate hydrate capable of removing copper ions in wastewater and a preparation method thereof, belonging to the field of removal of heavy metal ions. Background technique [0002] In recent years, with the continuous development of industry, my country's environmental problems are also facing great challenges. A large number of surface water and groundwater environments are polluted by various heavy metals, such as lead, cadmium, copper, mercury, zinc, chromium, etc. Due to the enrichment of heavy metals, it is difficult to be degraded in the environment, and the accumulation through the biological chain is easy to cause various biological disorders, and the problem of heavy metal pollution is severe. Although environmental problems have been greatly improved with the introduction of relevant policies in recent years, many heavy metal ions will enter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20
CPCB01J20/10C02F1/281C02F2101/20
Inventor 崔素萍刘世杰郭红霞郑焱王亚丽
Owner BEIJING UNIV OF TECH