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Metal modified La2O2CO3 adsorbent as well as preparation method and application thereof

A metal modification, adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of small number of sites, low phosphorus adsorption capacity, active adsorption sites single order issues

Active Publication Date: 2022-03-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: the purpose of the present invention is to solve the problem that the phosphorus adsorption capacity caused by the simple use of lanthanum oxycarbonate is too single, the number of sites is small and the exposure is not sufficient.

Method used

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  • Metal modified La2O2CO3 adsorbent as well as preparation method and application thereof
  • Metal modified La2O2CO3 adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First, 3.7542g La(NO 3 )·6H 2 O and 0.2524g Ni(NO 3 ) 2 ·6H 2 O dissolved in 20mL deionized water, La(NO 3 )·6H 2 O and Ni(NO 3 ) 2 ·6H 2 The total molar amount of O was fixed at 0.01 mol. In addition, 4.33 g of citric acid monohydrate and 6 g of polyethylene glycol-6000 were dissolved in 20 mL of deionized water as complexing agents for metal ions. After the metal salt is fully dissolved, the metal nitrate mixed solution is added dropwise to the mixed solution of citric acid and polyethylene glycol and fully stirred for 40 minutes. Subsequently, the mixed solution was placed in a magnetically stirred oil bath, the mixed solution was heated from room temperature to 80° C., and the stirring was continued for 6 h. Subsequently, the wet gel was dried in a vacuum oven at 80° C. for 15 hours to form a dry gel. The dry gel was taken out and placed in a muffle furnace, and the temperature was raised to 600 °C at a rate of 5 °C / min and kept for 2.5 h. After cooling ...

Embodiment 2

[0017] First, 3.8864g La(NO 3 )·6H 2 O and 0.3844g Al(NO 3 ) 3 9H 2 O dissolved in 20mL deionized water, La(NO 3 )·6H 2 O and Al(NO 3 ) 3 9H 2 The total molar amount of O was fixed at 0.01 mol. In addition, 4.33 g of citric acid monohydrate and 6 g of polyethylene glycol-6000 were dissolved in 20 mL of deionized water as complexing agents for metal ions. After the metal salt is fully dissolved, the metal nitrate mixed solution is added dropwise to the mixed solution of citric acid and polyethylene glycol and fully stirred for 30 minutes. Subsequently, the mixed solution was placed in a magnetically stirred oil bath, the mixed solution was heated from room temperature to 105° C., and the stirring was continued for 4 h. Subsequently, the wet gel was dried in a vacuum oven at 105°C for 24 hours to form a xerogel. The dry gel was taken out and placed in a muffle furnace, and the temperature was raised to 600 °C at a rate of 5 °C / min and kept for 4 h. After cooling down...

Embodiment 3

[0019] First, 4.2869g La(NO 3 )·6H 2 O and 0.0433g Ce(NO 3 ) 3 ·6H 2 O dissolved in 20mL deionized water, La(NO 3 )·6H 2 O and Ce(NO 3 ) 3 ·6H 2The total molar amount of O was fixed at 0.01 mol. In addition, 4.33 g of citric acid monohydrate and 6 g of polyethylene glycol-6000 were dissolved in 20 mL of deionized water as complexing agents for metal ions. After the metal salt is fully dissolved, the metal nitrate mixed solution is added dropwise to the mixed solution of citric acid and polyethylene glycol and fully stirred for 30 minutes. Subsequently, the mixed solution was placed in a magnetically stirred oil bath, the mixed solution was heated from room temperature to 90° C., and the stirring was continued for 10 h. Subsequently, the wet gel was dried in a vacuum oven at 90°C for 18 hours to form a dry gel. The dry gel was taken out and placed in a muffle furnace, and the temperature was raised to 600 °C at a rate of 5 °C / min and kept for 3 h. After cooling down...

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Abstract

The invention relates to a metal modified La2O2CO3 adsorbent as well as a preparation method and application thereof. The adsorbent is a solid solution formed by La2O2CO3 and any one of metal elements such as aluminum, nickel and cerium. The preparation method of the adsorbent comprises the following steps: dissolving lanthanum and a metal precursor at the same time, controlling the mass percentage of doped metal elements to be not more than 15% and the total molar weight concentration to be 0.5 mol / L, dropwise adding into a complex, and crushing after low-temperature treatment and high-temperature treatment to obtain the adsorbent. The adsorbent can be applied to adsorption and removal of inorganic phosphate in municipal wastewater and eutrophic water.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a metal-modified La 2 o 2 CO 3 Sorbent and its preparation method and application. Background technique [0002] Since the rare earth element lanthanum exhibits an efficient binding ability to phosphorus, it can form an extremely insoluble and stable lanthanum-phosphorus compound, so that phosphorus can be removed from polluted water. La 2 o 2 CO 3 As a new type of lanthanum-containing adsorption material with relatively stable chemical properties, it has aroused widespread interest of environmental workers. Invention patent A preparation method of sea urchin-shaped microsphere lanthanum oxycarbonate adsorbent for phosphorus removal in water (CN201610322466.2), Invention patent A preparation method of composite phosphorus removal adsorbent Lanthanum oxycarbonate loaded montmorillonite (CN2020105093582), Invention patent, a preparation method of a magnetic recyclable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F101/10
CPCB01J20/02B01J20/0207C02F1/281B01J2220/4806B01J2220/42C02F2101/105
Inventor 宋茂勇毕磊刘敬章
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI