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High-phosphate-adsorption-activity large-particle-size zirconium hydroxide, and preparation and use methods and application thereof

A technology of zirconium hydroxide and adsorption activity, which is applied in the field of water purification, can solve the problems of difficult removal of hypophosphite, low phosphorus removal efficiency, and increased cost, and achieve high-efficiency recovery, good adsorption effect, and reduced dialysis pressure.

Inactive Publication Date: 2016-03-30
JIANGXI KINGAN HI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, chemical precipitation is widely used, usually adding phosphate ion flocculant and then adding lime precipitation to achieve the effect of phosphorus removal, but hypophosphite is more difficult to remove; biological phosphorus removal efficiency is relatively low, usually combined with chemical precipitation It can purify water, but it increases the cost; the purpose of purifying water can be achieved through the high-voltage and low-current three-stage treatment technology of electrocoagulation, but it consumes a lot of energy
Phosphorus removal by adsorption is not only highly efficient, but also the adsorption material can be recycled through desorption. For example, Zhang Junbao et al.’s research in the paper "Research on Treatment of Phosphorus-Containing Wastewater with Modified Bentonite" shows that the modified bentonite is effective for trace phosphorus ion solution. Has a removal rate of 96.78%, but the adsorption capacity is only 0.096mmol / g

Method used

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  • High-phosphate-adsorption-activity large-particle-size zirconium hydroxide, and preparation and use methods and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of 20wt%Ba(OH) 2 solution and 240g / LZrOCl 2 Solution, in Ba(OH) at 90°C with stirring 2 Add ZrOCl to the solution 2 Solution, and control the reaction end point pH=8.0, age at 60°C for 36h, then suction filter at 60°C, and wash with 90°C water three times to obtain the filter residue. Mix the filter residue and water at 1:4 (weight ratio) for beating, then slowly add 0.83mol / L dilute acetic acid dropwise under the action of stirring, control the pH of the acid adjustment end point to 5.30, and stabilize at pH=5.30 for 20min, then Suction filtration and washing with 90°C water six times to obtain a solid sample. The sample was dried in an oven at 50°C so that the zirconium content was 60.65 wt%, and finally zirconium hydroxide with large particle size and high adsorption activity for phosphate was prepared.

Embodiment 2

[0025] Prepare mixed lye containing 20wt%NaOH and 28wt%KOH and 60wt%ZrOSO 4 suspension, and then the ZrOSO 4 Pour the slurry into NaOH and KOH solutions, and control the reaction end point pH=9.00, age at 120°C for 2h, then suction filter at 100°C, and filter and wash with 50°C water for 5 times to obtain the filter residue. Mix the filter residue and water at a ratio of 1:1 (weight ratio) for beating, and then slowly add a mixed acid solution composed of acetic acid and citric acid dropwise under the action of stirring. The concentrations of acetic acid and citric acid in the mixed acid solution are respectively 0.7mol / L and 0.75mol / L, control the acid adjustment end point pH = 2.51, and stabilize at pH = 2.51 for 60min, then suction filter and wash with 50°C water three times to obtain a sample. The sample was dried in an oven at 120°C so that the zirconium content was 70.83wt%, and finally a large particle size zirconium hydroxide with high adsorption activity for phosphat...

Embodiment 3

[0027] Prepare 50wt% KOH solution, add ZrOCO at 90°C with stirring 3 ·nH 2 O is solid, and the pH of the reaction end point is controlled to be 12.08, aged at 80°C for 24 hours, then suction-filtered at 80°C, and washed 4 times with 80°C water to obtain a filter residue. Mix the filter residue and water at a ratio of 1:3 (by weight) and add water to make a slurry, then slowly add 1.22mol / L allylpropionic acid dropwise under the action of stirring, control the pH of the acid adjustment end point to 6.04, and stabilize at pH=6.04 for 120min, Then it was filtered with suction and washed with water at 80°C for 4 times to obtain a sample. The sample was dried in an oven at 80°C so that the zirconium content was 72.81wt%, and finally a large particle size zirconium hydroxide with high adsorption activity for phosphate was prepared.

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Abstract

The invention discloses a high-phosphate-adsorption-activity large-particle-size zirconium hydroxide. The specific area is 300-700 m<2> / g; the pore volume is 0.15-0.3 cm<3> / g; the pore size is 1.5-3.0nm; and the particle size D10 is greater than or equal to 5 mu m and smaller than or equal to 15 mu m, the particle size D50 is greater than or equal to 20 mu m and smaller than or equal to 30 mu m, and the particle size D90 is greater than or equal to 40 mu m and smaller than or equal to 90 mu m. The invention also discloses preparation and use methods and application of the zirconium hydroxide. The prepared zirconium hydroxide has favorable selective adsorption effects on H2PO4<->, HPO4<2-> and PO4<3-> in the water body, and is free from the influence of other impurity ions; and the adsorption capacity can reach 0.7 mmol / g or above. The zirconium hydroxide has the advantages of favorable biocompatibility, no toxicity and no harm, can lower the dialysis pressure and energy consumption when being mixed with large-particle-size SiO2, and can be used as a medical dialysis material to regulate the phosphorus content in blood.

Description

technical field [0001] The invention belongs to the technical field of water body purification, and in particular relates to zirconium hydroxide with large particle size and high phosphate adsorption activity and a preparation method thereof. Background technique [0002] Phosphate ion (PO 4 3- ) is a common anion in chemical production. Its existence will bring great harm to production and the environment, especially in water bodies, it will cause rapid reproduction of algae in water, thereby causing red tides and so on. In daily life, if the phosphate ion content in human blood is too high, it will cause harm to the liver and heart of the human body. [0003] At present, the methods used in industry to remove phosphorus in water mainly include chemical precipitation, biological method, electrocoagulation method and adsorption method. Among them, chemical precipitation is widely used, usually adding phosphate ion flocculant and then adding lime precipitation to achieve t...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/28057C02F1/281C02F2101/105
Inventor 李春邱才华陈孝伟陈双华谌美玲
Owner JIANGXI KINGAN HI TECH
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