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Lanthanum-iron modified zeolite phosphorus removal adsorbent and preparation method and application thereof

A kind of technology of modifying zeolite and adsorbent

Inactive Publication Date: 2019-06-07
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of natural zeolite on phosphorus removal is not good, and the adsorption capacity is less than 1 mg / g. Therefore, it is urgent to effectively modify natural zeolite to enhance its adsorption performance and improve its phosphorus removal effect.

Method used

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  • Lanthanum-iron modified zeolite phosphorus removal adsorbent and preparation method and application thereof
  • Lanthanum-iron modified zeolite phosphorus removal adsorbent and preparation method and application thereof
  • Lanthanum-iron modified zeolite phosphorus removal adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The preparation method of phosphorus removal adsorbent, its step is as follows:

[0060] 1) Dissolve 0.008mol of lanthanum nitrate hexahydrate and iron nitrate nonahydrate in 200mL of deionized water at a molar ratio of 1:2, and mix well to form a mixed solution of lanthanum salt and iron salt;

[0061] 2) Add 10 g of zeolite to the mixed solution of lanthanum salt and iron salt in step 1), mix well, and stir for 3 hours to make an intermediate reaction solution;

[0062] 3) Evenly and slowly add sodium hydroxide solution to adjust the pH of the intermediate reaction solution obtained in step 2) to 9.5. After continuing to stir for 3 hours, turn off the magnetic stirrer, leave the intermediate reaction solution to age for 24 hours, and use a centrifuge to achieve solid-liquid separation of the solution , The centrifuge speed is 3500rpm. Wash the precipitate with water several times until the supernatant reaches a neutral pH of 7, and collect the precipitate;

[0063] ...

Embodiment 2

[0065] In order to explore the phosphorus removal effect after adsorbent modification, this embodiment compares the phosphorus removal performance of natural zeolite before and after modification (such as figure 1 )

[0066] The method for preparing adsorbent is the same as in Example 1.

[0067] The experimental process of adsorbent phosphorus removal effect is as follows: the phosphate solution of preparation 2mg / L is placed in the beaker, adds the zeolite before the modification of 0.5g / L and the adsorbent prepared in Example 1 respectively (dosage is determined by previous experiment ), fully reacted for 4h, measured the content of phosphate in the solution, and calculated and compared the removal rates of phosphate of the two kinds of adsorbents. In the modified zeolite experimental group, the phosphate removal rate increased from 5.34% to 99.66% in 4 hours, and the phosphorus removal effect of the adsorbent was significantly improved. After the reaction, the phosphate c...

Embodiment 3

[0071] In order to explore the influence of adsorbent and phosphate contact time on adsorbent dephosphorization, this embodiment measures the concentration of phosphate in the solution at different times, and obtains the kinetic curve of adsorbent adsorption of phosphate (such as figure 2 ).

[0072] The method for preparing adsorbent is the same as in Example 1.

[0073] The adsorption kinetics experiment process is as follows: configure 2 mg / L phosphate solution and place it in a beaker, add 0.5 g / L adsorbent, start adsorption and record the reaction time, respectively at 10, 20, 30, 40, 50, 60, Samples were taken at 90, 120, 150, 210, and 270 minutes (3 parallels) to measure the phosphate concentration. The scatter diagram of adsorbent adsorption amount and contact time was drawn by software, and the experimental results were fitted by adsorption pseudo-first-order kinetic equation and pseudo-second-order kinetic equation, respectively. It can be found that the adsorptio...

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Abstract

The invention relates to a lanthanum-iron modified zeolite phosphorus removal adsorbent and a preparation method and application thereof. Natural zeolite is modified by lanthanum salt and iron salt. At first, a mixed solution of lanthanum and iron is prepared, and then zeolite is added, and that mixture is uniformly mixed, the pH of the solution is adjusted to be alkaline, and a precipitate of lanthanum and iron is formed, so that the precipitate is fully loaded on the surface of the zeolite. Aging, filtering, washing, drying and roasting are performed to obtain the adsorbent. The invention modifies the cheap natural zeolite, improves the phosphorus removal effect of the natural zeolite to a certain extent, and makes up for the defects of the natural zeolite in phosphorus removal.

Description

technical field [0001] The invention relates to the field of adsorbents, the field of advanced sewage treatment, and the field of water body purification, in particular to a lanthanum-iron modified zeolite phosphorus-removing adsorbent and its preparation method and application. Background technique [0002] Eutrophication of water body is a ubiquitous water pollution problem, and nitrogen and phosphorus are the main polluting elements causing eutrophication of water body. Studies have shown that when the N / P ratio is low, it is conducive to the formation of algae in water bodies. Nitrogen can be removed from water bodies through nitrogen fixation, while phosphorus cannot be cycled in nature and will continue to accumulate in water bodies and sediments. When the total phosphorus concentration is greater than 0.02mg / L, it will cause eutrophication of the water body, and it is very necessary to control the total phosphorus concentration in the water body. In order to protect...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F101/10
Inventor 张光明魏婷
Owner RENMIN UNIVERSITY OF CHINA
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