Method for preparing lanthanum or cerium pillared montmorillonite fluorine removal agent

A technology for pillared montmorillonite and montmorillonite, which is applied in the field of preparation of fluorine removal agents, can solve the problems of unsatisfactory fluorine removal effect, low adsorption capacity, complicated preparation process, etc., and achieves fast adsorption speed and simple preparation process. , the effect of low reaction temperature

Inactive Publication Date: 2013-05-01
HEFEI UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0007] The present invention aims to provide a preparation method of lanthanum or cerium pillared montmorillonite defluoridation adsorbent, to overcome the low adsorption capacity of existing adsorbents, complex preparation process, high preparation cost, and excessive cost of defluoridation only by rare earth elements. High, and the disadvantage of using unpillared modified natural montmorillonite for the unsatisfactory removal of fluorine, a method for preparing a defluoridation agent that can efficiently remove fluoride ions in high-fluorine water is provided

Method used

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  • Method for preparing lanthanum or cerium pillared montmorillonite fluorine removal agent
  • Method for preparing lanthanum or cerium pillared montmorillonite fluorine removal agent
  • Method for preparing lanthanum or cerium pillared montmorillonite fluorine removal agent

Examples

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Embodiment 1

[0032] Weigh 10g montmorillonite and 0.4gNa 2 CO 3 Put it into a beaker, add 200ml of water to form a suspension with a mass ratio of 5wt%, and stir at a high speed for 90 minutes to obtain a montmorillonite suspension B;

[0033] With 1.0mol / LNaOH 10mL and 100mL 0.1mol / L La(NO 3 ) 3 The solutions are mixed such that OH - with La 3+ The molar ratio is 1, stirred for 30min, and aged for 24h to make lanthanum pillar solution A;

[0034] In the case of high-speed stirring, drop the above-mentioned lanthanum pillar solution A into the sodium montmorillonite suspension B, after the dropwise addition, continue to stir for 1.5h, and age at room temperature for 24h;

[0035] The mixed solution was centrifuged and washed 3 times, and the precipitate was directly placed in a crucible, and baked at 105°C for 16 hours to obtain a lanthanum pillared montmorillonite solid, which was calcined in a muffle furnace at 200°C for 2 hours, Crush and sieve to obtain granular material with a p...

Embodiment 2

[0040] Weigh 10g montmorillonite and 0.4gNa 2 CO 3 Put it into a beaker, add 200ml of water to form a suspension with a mass ratio of 5wt%, and stir at a high speed for 90 minutes to obtain a montmorillonite suspension B;

[0041] With 1.0mol / LNaOH 10mL and 100mL 0.1mol / L Ce(NO 3 ) 3 The solutions are mixed such that OH - with Ce 3+ The molar ratio is 1, stirred for 30min, and aged for 24h to make cerium pillar solution A;

[0042] In the case of high-speed stirring, drop the above-mentioned cerium pillar solution A into the sodium montmorillonite suspension B, after the dropwise addition, continue to stir for 1.5h, and age at room temperature for 24h;

[0043]The mixed solution was centrifuged and washed 3 times, and the precipitate was directly placed in a crucible, and baked at 105°C for 16 hours to obtain a cerium pillared montmorillonite solid, which was calcined in a muffle furnace at 200°C for 2 hours, Crush and sieve to obtain granular material with a particle si...

Embodiment 3

[0048] The preparation of the adsorbent is the same as in Example 1. Weigh 0.1 g of lanthanum pillared montmorillonite defluorination agent and put it into a 250 mL conical flask, add 150 mL of 150 mL of fluorine-containing 5 mg / L aqueous solution, do 3 parallel samples, and use HCl Or adjust the pH of the fluorine solution to 2, 4, 6, 8, and 10 with NaOH, make 3 parallel samples for each pH, ​​and oscillate in a constant temperature oscillator at 25°C for 2 hours at a speed of 160r / min. Take the supernatant and filter (0.45 μm microporous membrane), measure the content of F-, the results are shown in Table 1. It can be seen from Table 1 that when the pH is between 4 and 8, the adsorption effect of the lanthanum pillared montmorillonite defluoridation agent is better, and the fluorine concentration in the effluent has reached the domestic drinking water standard, and it is stable in a wide pH range. The good adsorption effect makes the lanthanum pillared montmorillonite defluo...

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Abstract

The invention discloses a method for preparing a lanthanum or cerium pillared montmorillonite fluorine removal adsorbent agent. The method comprises the processes of: preparation of pillared liquid, sodium treatment of montmorillonite, aging of pillars, centrifugal washing, calcination, crushing, screening and the like. The method comprises the following concrete steps of: adding a certain proportion of alkali into a soluble trivalent lanthanum or cerium salt solution to prepare the pillared liquid; then adding into montmorillonite turbid liquid subjected to sodium treatment, and carrying out pillar aging; centrifugally washing the turbid liquid for multiple times, and drying; calcining in a muffle furnace; and crushing and screening to obtain particles, i.e. the fluorine removal agent. The lanthanum or cerium pillared montmorillonite fluorine removal agent prepared by the method provided by the invention has high adsorption capacity on fluorine, cannot cause secondary pollution, has a wide applicable pH range, and is used for treating high-fluoride drinking water; and the fluoride concentration in the treated water can reach the national drinking water standard.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a defluorinating agent which can be used for efficient adsorption and treatment of high-fluorine water. 2. Technical background [0003] Fluoride ions in drinking water are a double-edged sword for human health. On the one hand, fluorine is one of the trace elements needed by the human body. Adequate intake of fluoride can effectively prevent dental caries; on the other hand, excessive intake of Fluorine will affect the metabolism of calcium and phosphorus by human and machine, and cause the body's metabolism and physiological functions to be impaired, thus causing some fluorosis symptoms such as skeletal fluorosis and dental fluorosis. my country's current sanitary standards for drinking water stipulate that the concentration limit of fluoride in water bodies is 1.0mg / L. However, the fluorine content in groundwater in North...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F1/58
Inventor 王文静陈天虎谢晶晶章菲菲
Owner HEFEI UNIV OF TECH
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