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

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
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Example Embodiment

[0058] Example 1

[0059] The preparation method of phosphorus removal adsorbent, its steps are as follows:

[0060] 1) Dissolve 0.008 mol of lanthanum nitrate hexahydrate and iron nitrate nonahydrate in 200 mL of deionized water at a molar ratio of 1:2, and mix them evenly to prepare 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 thoroughly, and stir for 3 hours to prepare 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, continue stirring for 3 hours, turn off the magnetic stirrer, let the intermediate reaction solution stand for aging 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 for several times to the supernatant to a neutral pH of 7, ...

Example Embodiment

[0064] Example 2

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

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

[0067] The experimental process of the dephosphorization effect of the adsorbent is as follows: the phosphate solution of 2 mg / L is prepared and placed in a beaker, and the zeolite before modification of 0.5 g / L and the adsorbent prepared in Example 1 are added respectively (the dosage is determined by the previous experiment. ), fully react for 4h, measure the content of phosphate in the solution, calculate and compare the phosphate removal rates of the two adsorbents. In the modified zeolite experimental group, the removal rate of phosphate increased from 5.34% to 99.66% in 4 hours, and the phosphorus removal effect of the adsorbent was significantly improved. occu...

Example Embodiment

[0070] Example 3

[0071] In order to explore the influence of the contact time between the adsorbent and the phosphate on the phosphorus removal of the adsorbent, the phosphate concentration in the solution at different times was measured in this example, and the kinetic curve of the adsorbent for phosphate adsorption (such as figure 2 ).

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

[0073] The experimental process of adsorption kinetics is as follows: configure 2 mg / L phosphate solution in a beaker, add 0.5 g / L adsorbent, start adsorption and record the reaction time, respectively, at 10, 20, 30, 40, 50, 60, 90, 120, 150, 210, 270min sampling (3 parallel), determine the phosphate concentration. The software was used to draw the scatter diagram of the adsorption capacity and the contact time of the adsorbent, and the adsorption pseudo-first-order kinetic equation and pseudo-second-order kinetic equation were used to fit the experimenta...

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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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