Preparation method of lanthanum hydroxide modified aerogel phosphorus removal adsorbent

A technology of lanthanum hydroxide and phosphorus adsorbent, which is applied in the field of water pollution treatment, can solve the problems of limited application and low mechanical properties, and achieve the effects of fast adsorption speed, good mechanical properties and high specific adsorption capacity

Active Publication Date: 2020-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low mechanical properties of metal-crosslink

Method used

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  • Preparation method of lanthanum hydroxide modified aerogel phosphorus removal adsorbent
  • Preparation method of lanthanum hydroxide modified aerogel phosphorus removal adsorbent
  • Preparation method of lanthanum hydroxide modified aerogel phosphorus removal adsorbent

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specific Embodiment approach 1

[0037] Specific embodiment one: the preparation method of lanthanum hydroxide modified airgel dephosphorization adsorbent in this embodiment is carried out according to the following steps:

[0038] 1. Synthesis of lanthanum hydroxide modified hydrogel beads:

[0039] ①. Dissolving graphene oxide in deionized water and ultrasonically dispersing to obtain a graphene oxide dispersion;

[0040] ②. Dissolving lanthanum hydroxide in deionized water to obtain an aqueous solution of lanthanum hydroxide; dissolving sodium alginate in deionized water to obtain an aqueous solution of sodium alginate;

[0041] ③, mixing the dispersion of graphene oxide, lanthanum hydroxide aqueous solution and sodium alginate aqueous solution, stirring vigorously at room temperature to obtain a mixed solution;

[0042] ④. Under normal temperature conditions, add a cross-linking agent aqueous solution drop by drop into the mixed solution obtained in step ③ to obtain hydrogels, and then let stand for 18-2...

specific Embodiment approach 2

[0048] Embodiment 2: This embodiment differs from Embodiment 1 in that: Step 1 ① The ultrasonic dispersion process is: ultrasonication for 10 min to 30 min at an ultrasonic power of 100W to 500W.

specific Embodiment approach 3

[0049] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass fraction of graphene oxide in the graphene oxide dispersion in step ① is 0.2-0.5%.

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Abstract

The invention discloses a preparation method of a lanthanum hydroxide modified aerogel phosphorus removal adsorbent, and relates to a preparation method of a phosphorus removal adsorbent. The invention aims to solve the problems of low saturated adsorption capacity, difficulty in recycling after adsorption, low mechanical property and the like of the existing phosphorus removal adsorbent. The preparation method comprises the following steps: mixing a graphene oxide dispersion liquid, a lanthanum hydroxide aqueous solution and a sodium alginate aqueous solution, violently stirring, dropwise adding a cross-linking agent aqueous solution to obtain hydrogel beads, standing, carrying out cross-linking solidification, and finally, sequentially washing and drying the product. The adsorbent can berecycled, and is low in cost, high in adsorption speed, high in adsorption capacity and good in mechanical property. The method is suitable for preparing the phosphorus removal adsorbent.

Description

technical field [0001] The invention belongs to the technical field of water pollution treatment, and in particular relates to a preparation method of an adsorbent for phosphorus removal. Background technique [0002] Phosphorus is an important non-renewable nutrient that is necessary for biological growth. However, excessive phosphate discharge can produce severe eutrophication in water bodies. This may lead to the reduction of dissolved oxygen and the formation of a large number of algal toxins, which will cause abnormal reproduction of algae and other aquatic plants, and eventually lead to the collapse of the ecosystem, posing a huge threat to human health. Therefore, it is of great significance to effectively remove and recover phosphate in water. [0003] So far, phosphorus removal methods are diverse, including biological methods, chemical precipitation methods, ion exchange methods, membrane treatment methods, adsorption methods, etc. Among these methods, adsorptio...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/20B01J20/24B01J20/28047C02F1/281C02F1/283C02F1/286B01J2220/4806B01J2220/4825B01J2220/46C02F2101/105
Inventor 南军刘博涵
Owner HARBIN INST OF TECH
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