A kind of metal oxide particle adsorbent and preparation method thereof
A technology of oxide particles and adsorbents, which is applied in the field of new particle adsorbents and their preparation, can solve the problems that the integrity of particles cannot be maintained, and the internal space of shaped particles cannot be utilized, etc., and achieve good hydrophilicity and water permeability, good Mechanical strength, the effect of ensuring mass transfer effect
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[0041] The invention provides a method for preparing a metal oxide particle adsorbent. In a preferred embodiment, the method comprises the following steps:
[0042] (1) prepare metal oxide adsorbent;
[0043] (2) preparing a water-soluble viscose substance solution;
[0044] (3) adding the metal oxide adsorbent prepared in step (1) to the water-soluble viscose substance solution prepared in step (2), and mixing evenly to obtain a mixed glue;
[0045] (4) drop the mixed glue solution obtained in step (3) into the fixed solution that can make the water-soluble viscose substance solidify and granulate to obtain uniform spherical gel particles;
[0046] (5) adding the particles obtained in step (4) to a crosslinking solution containing a crosslinking agent for crosslinking;
[0047] (6) separating, washing and drying the cross-linked particles obtained in step (5) to obtain the metal oxide particle adsorbent.
[0048]Wherein, in step (1), the metal oxide adsorbent can be prepar...
Embodiment 1
[0064] (1) Preparation of metal oxide adsorbent
[0065] Using the method of the previous patent (application number 2009101773203), prepare polyvinyl alcohol aqueous solution, mix with iron and rare earth salt solution, then add alkali solution to pH 5.0-6.0, and carry out co-precipitation reaction to prepare high adsorption activity metal oxide adsorption agent.
[0066] The prepared iron-lanthanum composite oxide adsorbent was pulverized, sieved through a 150-mesh sieve, and subjected to static adsorption evaluation for 24 hours. It was determined that the fluorine removal adsorption capacity was 22.5 mg / g at an equilibrium concentration of 1 mg / L.
[0067] (2) Preparation of glue
[0068] Add 1.5ml of glacial acetic acid to 100ml of deionized water at room temperature to prepare an acetic acid solution; weigh 1.5g of chitosan, add it to the acetic acid solution, and heat it at 40°C to promote its rapid dissolution.
[0069] (3) metal oxide adsorbent mixed with glue
[0...
Embodiment 2
[0079] Prepare metal oxide particle adsorbent with the same method as in Example 1, except: the metal oxide adsorbent prepared in step (1) is the iron-lanthanum composite oxide adsorbent sedimentation mud cake prepared by precipitation method, and its water content is 75%, and the defluorination adsorption capacity is 33.8mg / g (by dry weight); the glue solution of step (2) is prepared at normal temperature; step (3) stirs and mixes with 10g mud cake and 15ml glue solution.
[0080] The prepared metal oxide particle adsorbent has been tested on 20 particles. The particle size range is 1.1-1.6mm, the crushing strength is 8-20N / grain, and the average strength is 13.7N / grain. At 1mg / L, the static adsorption capacity is 8.0mg / g.
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Abstract
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