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Cellulose-loaded porous calcium silicate filter material for heavy metal ion filtration and preparation method thereof

A technology of porous calcium silicate and heavy metal ions, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., and can solve the problems of filter materials that cannot intercept heavy metal ions, nanofiltration, ultrafiltration and microfiltration Problems such as the inability to separate, achieve the effect of facilitating popularization and industrialization, broadly promoting application value and application prospects, and expanding use methods

Active Publication Date: 2018-05-29
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For heavy metal wastewater, due to the small size of heavy metal ions, the radius of hydrated ions is generally less than 1nm. Ordinary filter materials cannot intercept heavy metal ions, and nanofiltration, ultrafiltration, and microfiltration cannot be separated.

Method used

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  • Cellulose-loaded porous calcium silicate filter material for heavy metal ion filtration and preparation method thereof
  • Cellulose-loaded porous calcium silicate filter material for heavy metal ion filtration and preparation method thereof
  • Cellulose-loaded porous calcium silicate filter material for heavy metal ion filtration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Take 150kg of coniferous wood pulp and add water to make a slurry with a concentration of 5.0% by mass, beat on a ZDC beater, beat with a light knife for 1.0h, beat with a medium knife for 3h, and beat with a heavy knife for 1.5h, a total of 5.5h. The measured pulping amount is 8.8g, and the degree of beating is 91 ° SR.

[0030] (2) Take 100 g of the wet slurry beaten in step (1) and add it to a 1500 mL three-necked bottle, add water to dilute to a fiber mass percentage of 0.4%, stir thoroughly for 2 hours, then add 10.15 g of calcium nitrate tetrahydrate, and stir to dissolve Then continue to stir for 1.5h, then add solid NaOH to adjust the pH to 10.1; then slowly 10.85g of tetraethyl orthosilicate with a mass fraction of 99.0%, continue to react at room temperature for 4h after the drop is completed, and leave it to age for 24h; filter, use Washed with distilled water 5 times, placed in a vacuum oven at 60° C. and dried to constant weight to obtain 9.73 g of cell...

Embodiment 2

[0032] (1) Take 150kg of hardwood pulp and add water to prepare a slurry with a mass percent concentration of 4.5%, beat on a ZDC beater, beat for 1.5 hours with a light knife, 2.5 hours with a medium knife, and 1 hour with a heavy knife, for a total of 5 hours. The measured slurry amount is 8.5g, and the degree of beating is 89 ° SR.

[0033] (2) Take 112 g of the wet slurry prepared in step (1) and add it to a 1500 mL three-neck bottle equipped with a constant pressure dropping funnel and a mechanical agitator, dilute with water until the fiber mass percentage is 0.5%, and fully stir for 1 h. Then add 5.10g of calcium nitrate tetrahydrate, stir to dissolve and continue to stir for 1h, then add solid NaOH to adjust the pH to 9.50; then slowly add 4.54g of ethyl orthosilicate with a mass fraction of 99.0%, and continue the reaction at room temperature for 3h after dripping , left to age for 12 hours; filtered, washed 3 times with distilled water, placed in a vacuum oven at 50°...

Embodiment 3

[0039] (1) Take 150kg of coniferous wood pulp and add water to make a slurry with a mass percentage concentration of 4.75%, beat on a ZDC type beater, beat with a light knife for 1.0h, beat with a medium knife for 2.5h, and knock with a heavy knife for 1.5h, a total of 5.0h . The measured pulping amount is 8.8g, and the degree of beating is 90°SR.

[0040] (2) Take 105.3 g of the wet slurry beaten in step (1) and add it to a 1500 mL three-necked bottle equipped with a constant pressure dropping funnel and mechanical agitation, dilute with water until the fiber mass percentage is 0.45%, and fully stir for 1.5 h, then add 7.60g of calcium nitrate tetrahydrate, stir to dissolve and continue to stir for 1.5h, then add solid NaOH to adjust the pH to 10.10; Continue to react for 3.5 hours, stand and age for 18 hours; filter, wash 4 times with distilled water, and dry in a vacuum drying oven at 70°C until constant weight to obtain a cellulose-loaded porous calcium silicate filter ma...

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Abstract

The invention relates to a cellulose-loaded porous calcium silicate filter material for heavy metal ion filtration and a preparation method thereof. The preparation method comprises fully beating, devillicating and brooming wood pulp fibers through a beater, hydrolyzing tetraethoxysilane through a calcium salt as a calcium source, tetraethoxysilane as a silicon source and the wood pulp fibers as support and reaction places under alkaline conditions to obtain silicate which is bonded to calcium ions to form calcium silicate loaded by the cellulose in situ. The preparation method solves the problem that the porous calcium silicate synthesis method needs a template agent or ultrasonic conditions, realizes high dispersion of the produced calcium silicate and firm bonding of the calcium silicate to fibers, and improves the stability of the cellulose-loaded porous calcium silicate filter material and the ability to adsorb heavy metal ions. The product can be used as a heavy metal wastewateradsorbing material and a filter column filling material, has good treatment effects and is suitable for treatment on wastewater containing various heavy metals. The preparation method has simple processes, is carried out under mild conditions and has a wide promotion range and a large use value.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a cellulose-loaded porous calcium silicate filter material for filtering heavy metal ions and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of industry, heavy metal wastewater has become a global environmental problem that seriously pollutes the environment and endangers human health. In the environment, heavy metals cannot be degraded naturally, and have accumulated into organisms through the food chain, and finally accumulated in the human body. Excessive accumulation of heavy metals can produce toxicity and directly affect the growth and physiological functions of organisms, leading to disease and even death. So far, many methods for treating heavy metal wastewater have been developed. Typical methods include chemical precipitation, reverse osmosis, membrane system, solvent extraction, adsorption, electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28B01J20/30C02F101/20
CPCB01J20/04B01J20/24C02F1/288C02F2101/20
Inventor 刘立华杨正池刘金燕薛建荣唐安平令玉林
Owner HUNAN UNIV OF SCI & TECH
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