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Preparation of zirconium-doped hydrotalcite-like adsorbent and application of zirconium-doped hydrotalcite-like adsorbent in treatment of phosphorus-containing wastewater

A hydrotalcite and adsorbent technology, which is applied in the direction of adsorption of water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor regeneration effect and small adsorption capacity, and achieve fast adsorption speed, The effect of large adsorption capacity and large economic value

Pending Publication Date: 2021-07-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It solves the problems of small adsorption capacity and poor regeneration effect of general adsorbents

Method used

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  • Preparation of zirconium-doped hydrotalcite-like adsorbent and application of zirconium-doped hydrotalcite-like adsorbent in treatment of phosphorus-containing wastewater
  • Preparation of zirconium-doped hydrotalcite-like adsorbent and application of zirconium-doped hydrotalcite-like adsorbent in treatment of phosphorus-containing wastewater
  • Preparation of zirconium-doped hydrotalcite-like adsorbent and application of zirconium-doped hydrotalcite-like adsorbent in treatment of phosphorus-containing wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1) 10.165g MgCl 2 ·6H 2 O and 4.5 g FeCl 3 ·6H 2 O was dissolved in 50mL deionized water to form a mixed metal solution, and 5.34g NaOH and 3.5g Na 2 CO 3 Dissolve in 50mL deionized water to make mixed lye. In the state of stirring, the two mixed solutions were slowly added dropwise to a three-necked flask containing 50 mL of deionized water with a peristaltic pump, and the pH of the reaction system was monitored with a pH meter. The pH of the solution was maintained at about 10 by controlling the rate of addition. make it happen co-precipitation reaction. After the reaction was completed, the slurry was transferred to a tetrafluoroethylene-lined hydrothermal kettle and heated at 120°C for 12 hours. Centrifugal washing until the pH is about 7, drying at 80°C, grinding through a 100-mesh sieve to obtain hydrotalcite-like powder, and roasting in a muffle furnace at 400°C for 2 hours to obtain an adsorbent material. The adsorption capacity is 41.65mg / g.

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Embodiment 2

[0029] Step 1) 10.165g MgCl 2 ·6H 2 O, 4.05g FeCl 3 ·6H 2 O and 0.537 ZrOCl 2 ·8H 2 O was dissolved in 50mL deionized water to form a mixed metal solution, and 5.34g NaOH and 3.5g Na 2 CO 3 Dissolve in 50mL deionized water to make mixed lye. Slowly drop the two mixed solutions into a three-necked flask containing 50mL of deionized water with a peristaltic pump while stirring, monitor the change in the pH of the reaction system with a pH meter, and maintain the pH of the solution at around 10 by controlling the dropping rate. make it happen co-precipitation reaction. After the reaction was completed, the slurry was transferred to a tetrafluoroethylene-lined hydrothermal kettle and heated at 120°C for 12 hours. Centrifugal washing until the pH is around 7, drying at 80°C, grinding through a 100-mesh sieve to obtain hydrotalcite-like powder, and roasting at 500°C in a muffle furnace for 4 hours to obtain an adsorbent material with an adsorption capacity of 64.40mg / g.

[...

Embodiment 3

[0032] Step 1) 10.165g MgCl 2 ·6H 2 O, 3.6g FeCl 3 ·6H 2 O and 1.074 ZrOCl 2 ·8H 2 O was dissolved in 50mL deionized water to form a mixed metal solution, and 5.34g NaOH and 3.5g Na 2 CO 3 Dissolve in 50mL deionized water to make mixed lye. Slowly drop the two mixed solutions into a three-necked flask containing 50mL of deionized water with a peristaltic pump while stirring, monitor the change in the pH of the reaction system with a pH meter, and maintain the pH of the solution at around 10 by controlling the dropping rate. make it happen co-precipitation reaction. After the reaction was completed, the slurry was transferred to a tetrafluoroethylene-lined hydrothermal kettle and heated at 120°C for 12 hours. Centrifugal washing until the pH is around 7, drying at 80°C, grinding through a 100-mesh sieve to obtain hydrotalcite-like powder, and roasting at 400°C in a muffle furnace for 2 hours to obtain an adsorbent material with an adsorption capacity of 77.38 mg / g.

[...

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Abstract

The invention relates to preparation of a zirconium-doped hydrotalcite-like adsorbent and application of the zirconium-doped hydrotalcite-like adsorbent in treatment of phosphorus-containing wastewater. According to the invention, the hydrotalcite-like material has a permanent positive charge laminate and a good anion exchange capability, and can generate a good adsorption effect on anions (such as phosphate radicals) in wastewater; and Zr < 4 + > has higher cationic charges, so that the electrostatic attraction between Zr < 4 + > and anionic adsorbate can be increased. Zr < 4 + > is introduced into the hydrotalcite-like laminate, so that the phosphorus-containing wastewater adsorbent which is large in adsorption capacity, easy to regenerate and recyclable can be constructed.

Description

technical field [0001] The invention relates to the preparation of a zirconium-doped hydrotalcite-like adsorbent and its application in treating phosphorus-containing wastewater, which is suitable for the recovery of phosphorus resources in natural water systems and belongs to the technical field of wastewater treatment. Background technique [0002] With the rapid development of my country's economy and society, the contradictory relationship between resource shortage and environmental pollution has gradually emerged, and seriously restricts the sustainable development of my country's economy. Phosphorus is an essential nutrient element for plant growth, but human beings input excessive phosphorus into the environment in production and life, causing algal blooms, leading to a series of environmental problems such as eutrophication of water bodies. According to the "2019 China Ecological Status Bulletin", some rivers and lakes in my country are still in a state of eutrophica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/02B01J20/28B01J20/30C02F1/28C01B25/32C02F101/10
CPCB01J20/02B01J20/043B01J20/28016C01B25/32C02F1/281C02F2101/105C02F2303/16
Inventor 宋云华吴腾飞陈建铭
Owner BEIJING UNIV OF CHEM TECH
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