Phosphorus adsorption material and preparation method thereof

A technology of adsorption materials and phosphorus adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of material loss, poor regeneration effect, difficult recycling, etc., and achieve strong material stability , fast adsorption speed, good regeneration effect

Pending Publication Date: 2021-01-15
包头中科万成环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned types of adsorbents all have defects that cannot be overcome at present: among them, ions in water have a significant impact on the removal of phosphorus by modified activated carbon; the adsorption capacity of natural minerals, activated carbon modified materials and biomass is small by 10-20mg / g; Changes have a great influence on the adsorption capacity of metal oxides. The optimum pH for adsorption is 2-6, and the adsorption capacity drops sharply when the pH exceeds 7, and the regeneration effect is poor and it is difficult to recycle; use low-valent rare earth elements such as trivalent cerium The prepared composite material is prone to dissolution during the application process, resulting in material loss
When using high-valence rare earth elements such as tetravalent cerium to prepare, it is easy to undergo redox reaction with variable-valence metals such as ferrous iron to form trivalent cerium, resulting in poor material stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve ferrous chloride and lanthanum chloride in a molar ratio of Fe:La=1:2 to form an aqueous solution, in which the concentration of iron ions is 0.5M, and stir evenly at room temperature; under stirring conditions, add 4mol / L sodium hydroxide solution until the pH of the solution is 9.5, stop adding alkali; add sodium chlorate to the mixed solution, the concentration of sodium chlorate is 0.15M, and keep stirring and aging at a temperature of 20°C for 8 hours; centrifuge and wash until The pH of the effluent is neutral; the washed product is dried to constant weight at 95°C, crushed and passed through a 200-mesh sieve; the obtained powdery product is calcined at 300°C for 24 hours to obtain a yellow-brown powder, which is the product of the present invention. Phosphorus adsorption material.

[0028] This phosphorus adsorption material is used to remove phosphate in water. Under the conditions of temperature 25°C and pH=7, when the initial total phosphorus is 13mg...

Embodiment 2

[0030] Dissolve ferrous sulfate and lanthanum nitrate at a molar ratio of Fe:La=1:1.5 to form an aqueous solution, in which the concentration of iron ions is 0.7M, and stir evenly at room temperature; under stirring conditions, add 6mol / L dropwise to the above solution Stop adding ammonia water until the pH of the solution is 7.0. Add hydrogen peroxide to the mixed solution. The concentration of hydrogen peroxide is 0.35M. Stir and age at a temperature of 55°C for 4 hours; centrifuge and wash until the pH of the effluent is neutral; The washed product was dried to constant weight at 75°C, and the powdery product obtained after crushing was calcined at 550°C for 4 hours to obtain a yellow-brown powder, which is the phosphorus adsorption material of the present invention.

[0031] This phosphorus adsorption material is used to remove phosphate in water. When the temperature is 25°C, pH=7, the initial total phosphorus is 13mg / L, and the dosage of the adsorbent is 0.1g / L, the adsor...

Embodiment 3

[0033] Dissolve ferrous sulfate and ceric sulfate in a molar ratio of Fe:Ce=1:1 to form an aqueous solution, in which the concentration of iron ions is 1M, and stir evenly at room temperature; under stirring conditions, add 3mol / L dropwise to the above solution Potassium hydroxide solution until the pH of the solution is 10.0, stop adding potassium hydroxide dropwise; add potassium permanganate to the mixed solution, the concentration of potassium permanganate is 0.2M, and continue to stir and age at a temperature of 45 °C for 6 hours; centrifuge And wash until the pH of the effluent is neutral; the washed product is dried to constant weight at 60°C, and the powdery product obtained after crushing is roasted at 600°C for 3 hours to obtain yellow-brown particles, which is the phosphorus adsorption of the present invention. Material.

[0034] This phosphorus adsorption material is used to remove phosphate in water. When the temperature is 25°C, pH=7, the initial total phosphorus...

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Abstract

The invention belongs to the field of environment-friendly materials, and particularly relates to a phosphorus adsorption material and a preparation method thereof. The phosphorus adsorption materialis composed of iron oxide and rare earth oxide, the mass percentage range of the iron oxide is 20%-70%, and the mass percentage range of the rare earth oxide is 30%-80%. The preparation method comprises the following steps: by taking a mixed solution of ferric salt and rare earth salt as a raw material, adding an alkaline solution to react to generate precipitate, aging, cleaning, separating, drying to constant weight, calcining, crushing and screening. The phosphorus adsorption material disclosed by the invention has the advantages of strong stability, wide applicable pH range, large adsorption capacity, good regeneration effect and the like; and the phosphorus adsorption material can be applied to phosphorus-containing sewage treatment, riverway treatment or lake treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection materials, and in particular relates to a phosphorus adsorption material and a preparation method thereof. Background technique [0002] Methods for phosphorus removal from sewage include chemical precipitation, electrolysis, microorganism, aquatic biology, physical adsorption, soil treatment and membrane technology. Among them, the adsorption method has been widely used in phosphorus removal due to its advantages of large capacity, low energy consumption, low pollution, fast removal and recyclability. [0003] At present, the commonly used phosphorus adsorption materials in sewage mainly include: activated carbon supported transition metals, rare earth metal oxides, biomass metal (hydr) oxides, and natural mineral adsorbents. In addition to the above-mentioned types of adsorbents, iron ore, graphene and Gel, etc. can also be used as an adsorbent for phosphorus removal. In recent years, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F101/10
CPCB01J20/06C02F1/281C02F2101/105C02F2103/007
Inventor 张丹丹王敏何穆池建义张耀
Owner 包头中科万成环保科技有限公司
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