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Selective nitrate radical adsorbent preparation method

A nitrate and adsorbent technology, applied in the field of preparation of selective nitrate adsorbents, can solve problems such as reducing the nitrate adsorption effect, and achieve the effects of increasing the modification effect and improving the adsorption characteristics

Active Publication Date: 2020-03-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the adsorbent is used to treat high-salt wastewater, due to the competitive adsorption, other anions in the wastewater quickly occupy the adsorption sites on the surface of the adsorbent, thereby reducing the adsorption effect of nitrate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Prepare 2LMg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 Mixed salt solution A of O, Mg in the solution 2+ The concentration of the substance is 0.6mol / L, Fe 3+ The concentration of the substance is 0.15mol / L; configure 2LNaOH and NaOH 2 CO 3 The mixed solution B, Na 2 CO 3 The molar concentration of the substance is 0.3 mol / L, and the molar concentration of the NaOH substance is 1.5 mol / L. After adding 4L of deionized water into the 10L reactor, add the mixed salt solution A and the mixed solution B dropwise into the reactor at a rate of 800ml / h, and stir vigorously at the same time to control the pH value of the mixed stirring solution in the reactor. 9. After the titration, the slurry was kept stirring at 60° C. and aged for 12 hours. After aging, filter the formed hydrotalcite, wash and filter three times, transfer the filter cake to a crucible, place it in a drying oven at 105°C for 12 hours, and place the product in a desiccator for later use. According...

Embodiment 2

[0062] (1) Prepare 2LMg(NO3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 Mixed salt solution A of O, Mg in the solution 2+ The concentration of the substance is 0.8mol / L, Fe 3+ The molar concentration of the substance is 0.2mol / L; the mixed solution B of 2LNaOH and Na2CO3 is configured, the molar concentration of the Na2CO3 substance is 0.4mol / L, and the molar concentration of the NaOH substance is 2.0mol / L. After adding 4L of deionized water into the 10L reactor, add the mixed salt solution A and the mixed solution B dropwise into the reactor at a rate of 600ml / h, while vigorously stirring, and controlling the pH of the mixed stirring solution in the reactor to be 10. After the titration, the slurry was kept stirring at 60° C. and aged for 12 hours. After aging, filter the formed hydrotalcite, wash and filter three times, transfer the filter cake to a crucible, place it in a drying oven at 105°C for 12 hours, and place the product in a desiccator for later use. According to the r...

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Abstract

The invention belongs to the field of sewage treatment, and particularly relates to a selective nitrate radical adsorbent preparation method. According to the preparation method, hydrotalcite with anadjustable and controllable interlayer structure and polypyrrole modified montmorillonite are respectively prepared; hydrotalcite is subjected to delaminating separation to form a dispersed lamellar structure; the surface electrical property of a material is changed by utilizing characteristics of adjustable types and adjustable number of the cations of the hydrotalcite polar plate; montmorillonite is intercalated, so that the montmorillonite polypyrrole modification effect is improved, and the adsorption characteristic on nitrate radicals is improved while steric hindrance is formed; and finally the hydrotalcite and the montmorillonite are subjected to composite bonding intercalation to form a layered structure composite material with a certain steric hindrance, wherein the material is applied to adsorption of nitrate radicals in high-salt wastewater (especially high-salt wastewater with high sulfate radical content), and has good adsorption selectivity and good adsorption capacity, wherein the removal rate of nitrate radicals in wastewater is greater than or equal to 70%.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a preparation method of a selective nitrate adsorbent. Background technique [0002] After nitrate accumulates in the human body, it will generate nitrite through the action of nitrate reductase. Under the action of various nitrogen-containing organic compounds, such as amine, urea, cyanamide, etc., nitrite will be transformed into carcinogenic, Teratogenic and mutagenic nitrosoamines and nitrosophthalamides induce various tumors in the human body, such as intestinal, nervous system, brain, skin, bone and other tumor diseases. Nitrate is also easy to cause goiter and inhibit the thyroid gland from absorbing inorganic iodine. Even in water bodies with high iodine content, if the content of nitrate in the water is high, endemic goiter will easily be caused. Nitrite can also react with hemoglobin in the blood to form methemoglobin, which affects the transmission of oxyge...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F101/16
CPCB01J20/165C02F1/281C02F2101/163Y02W10/10
Inventor 李波刘婷婷李茂双潘咸峰黄斌王秀丽
Owner CHINA PETROLEUM & CHEM CORP
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