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Adsorbent, Preparation and Application of Bacterial Cellulose Supported Lanthanum Metal Compounds

A technology of bacterial cellulose and metal compounds, applied in the direction of adsorption water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of secondary pollution, high cost, high requirements for reaction conditions, etc., and achieve mild reaction conditions , good load function, fast phosphorus removal effect

Inactive Publication Date: 2015-12-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical phosphorus removal rate is very high, it requires high reaction conditions (such as pH) in the chemical reaction process, and sludge is produced in the phosphorus removal process to cause secondary pollution of the water body; the biological phosphorus removal method Phosphorus removal effect is not stable, phosphorus removal conditions are harsh and expensive; in contrast, adsorption phosphorus removal is an efficient and low-consumption method for removing specific solutes from low-concentration solutions, and its operation is simple and its adsorption capacity is stable. Suitable for the removal of harmful substances in wastewater
[0004] The key to adsorption phosphorus removal technology lies in the choice of adsorbent. The rare earth lanthanum ion is a strong Lewis acid with a good affinity for phosphate radicals. The literature (J.Mater.Chem., 2011, 21, 2489–2494) refers to A La-SBA-15 adsorbent has been developed. The adsorbent has relatively strong adsorption, the maximum adsorption rate is 95%, but the adsorption equilibrium time is as long as 24h

Method used

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  • Adsorbent, Preparation and Application of Bacterial Cellulose Supported Lanthanum Metal Compounds

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the first step, 2 g of bacterial cellulose crude product is washed and filtered with tap water, and deionized water is added for sterilization in a water bath. With 3‰NaOH solution and 1.5‰H 2 o 2 Soak it in a water bath at 90°C for 2 hours to further purify the crude bacterial cellulose, then add HAc-NaAc buffer solution dropwise to neutralize and remove excess NaOH, and finally, filter and wash the product to obtain purified bacterial cellulose;

[0032] In the second step, 0.7g of lanthanum nitrate was dissolved in deionized water and stirred; then the purified bacterial cellulose obtained in the first step was added to it, and ultrasonically dispersed for 4h; under stirring condition, ammonia water was slowly added dropwise therein to adjust pH to 10.0;

[0033] The third step is to transfer the product of the second step to a hydrothermal reaction kettle for hydrothermal reaction. The reaction temperature is 180°C and the reaction time is 16h. After the reacti...

Embodiment 2

[0035] In the first step, 2 g of bacterial cellulose crude product is washed and filtered with tap water, and deionized water is added for sterilization in a water bath. With 2.5‰NaOH solution and 1.5‰H 2 o 2 Soak it in a water bath at 80°C for 3 hours to further purify the crude bacterial cellulose, then add HAc-NaAc buffer solution dropwise to neutralize and remove excess NaOH, and finally, filter and wash the product to obtain purified bacterial cellulose;

[0036] In the second step, 0.82g of lanthanum nitrate was dissolved in deionized water and stirred; then the purified bacterial cellulose obtained in the first step was added to it, and ultrasonically dispersed for 3h; pH to 7.0;

[0037] The third step is to transfer the product of the second step into a hydrothermal reaction kettle for hydrothermal reaction. The reaction temperature is 200°C and the reaction time is 24h. The bacterial cellulose-loaded lanthanum metal compound adsorbent is obtained.

[0038] figur...

Embodiment 3

[0041] In the first step, 2 g of bacterial cellulose crude product is washed and filtered with tap water, and deionized water is added for sterilization in a water bath. With 3‰NaOH solution and 3‰H 2 o 2Soak it in a water bath at 80°C for 2 hours to further purify the crude bacterial cellulose, then add HAc-NaAc buffer solution dropwise to neutralize and remove excess NaOH, and finally, filter and wash the product to obtain purified bacterial cellulose;

[0042] In the second step, 0.6 g of lanthanum nitrate was dissolved in deionized water and stirred; then the purified bacterial cellulose obtained in the first step was added to it, and ultrasonically dispersed for 2 hours; under stirring conditions, ammonia water was slowly added dropwise therein to adjust pH to 8.0;

[0043] The third step is to transfer the product of the second step to a hydrothermal reaction kettle for hydrothermal reaction. The reaction temperature is 100°C and the reaction time is 12h. After the rea...

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Abstract

The invention discloses an absorbent of a bacterial cellulose supported lanthanum metal compound, as well as preparation and application of the absorbent. By taking bacterial cellulose as a matrix, the absorbent is synthesized by adopting a mild hydrothermal method. Since a large quantity of hydroxyls on the surface of the bacterial cellulose are used for relatively well anchoring lanthanum metal, the lanthanum compound can be well arranged on the surface of the bacterial cellulose in a supported manner. According to the absorbent, the hydroxyls on the surface of the bacterial cellulose are relatively strong in water absorption, so that the absorbent can be used for removing phosphorus in wastewater. The absorbent has the advantages of strong phosphorus removing capability, high phosphorus removing rate, environmental protection and the like.

Description

technical field [0001] The invention relates to an adsorbent for phosphorus removal, in particular to an adsorbent for bacterial cellulose loaded with a lanthanum metal compound, its preparation and its application. Background technique [0002] Eutrophication has become a serious environmental problem today, and the excessive discharge of a large amount of nutrients such as nitrogen and phosphorus in water bodies is the main cause of eutrophication. Recent studies have found that phosphorus is the main element that causes eutrophication in water bodies. Phosphorus-polluted water bodies have rapid proliferation of algae and plankton, decreased dissolved oxygen in water bodies, deteriorated water quality, and caused massive deaths of fish and other aquatic organisms. It is imperative to reduce the phosphorus content in wastewater as much as possible. [0003] At present, wastewater phosphorus removal methods can be divided into chemical phosphorus removal, biological phospho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58
Inventor 杨加志魏静蒋国民孙东平鲁啸宇代北北
Owner NANJING UNIV OF SCI & TECH
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