Preparation method of lanthanum oxide-carrying zeolite for removing fluorine

A technology of lanthanum oxide and zeolite, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., to achieve the effects of good fluorine removal ability, simple and easy regeneration method, and large adsorption capacity

Inactive Publication Date: 2010-07-21
GUANGDONG PHARMA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ning Pingping (Ning Ping, Li Bin, Yang Yuehong, Zhang Yong, Chen Yubao. Study on Dynamic Phosphorus Removal of Rare Earth Adsorbents in Slightly Polluted Water[J]. Chinese Journal of Rare Earth, 2005, 23 (Sup

Method used

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  • Preparation method of lanthanum oxide-carrying zeolite for removing fluorine
  • Preparation method of lanthanum oxide-carrying zeolite for removing fluorine
  • Preparation method of lanthanum oxide-carrying zeolite for removing fluorine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Preparation experiment of loaded lanthanum oxide zeolite

[0052] 1. Take a certain amount of pretreated zeolite in an Erlenmeyer flask, add a certain concentration of lanthanum chloride solution with a solid-to-liquid ratio of 1:5 (zeolite g: modifier solution volume ml), adjust with 28wt% concentrated ammonia water When the pH is 11-12, cover the cork immediately, impregnate and stir it for 24 hours at room temperature, discard the filtrate and dry it, then put it in a muffle furnace and burn it at high temperature for a certain period of time, take it out and wash the residual lanthanum ion with distilled water after cooling, 80 ℃ drying. The effects of different pretreatment methods of zeolite, modifier concentration, igniting temperature, igniting time and other experimental conditions on the modified zeolite were investigated, and the preparation conditions of the modified zeolite were optimized.

[0053] 2. Take 25g of zeolite and soak it in 125ml of 2...

Embodiment 2

[0057] The pretreatment of embodiment 2 loaded lanthanum oxide zeolite

[0058] Acid treatment method: soak the zeolite in 0.5mol / L hydrochloric acid for 2 hours, then wash it with distilled water until neutral.

[0059] Alkali treatment method: soak the zeolite in 2wt% sodium hydroxide for 2 hours, then wash it with distilled water until neutral.

[0060] The acid-base pretreated zeolite and the original zeolite were modified according to the preparation method of the lanthanum oxide-loaded zeolite in Example 1. Take 2.0g of zeolite each and pack it into a column, and conduct a dynamic defluorination test through the column. The results are shown in Table 1.

[0061] Table 1 Dynamic defluorination results of modified zeolite with different pretreatment methods

[0062]

[0063] The results in Table 1 show that the best dynamic defluoridation effect is the lanthanum oxide zeolite loaded after alkali treatment, followed by the directly loaded lanthanum oxide zeolite. Sin...

Embodiment 3

[0064] The selection of embodiment 3 lanthanum chloride concentration

[0065] After the zeolite was pretreated by alkali, it was soaked and modified with lanthanum chloride solution of 2wt%, 5wt%, 10wt%, 15wt%, and 20wt%, respectively, and 2.0g of modified zeolite was packed into a column for dynamic defluorination test. See Table 2.

[0066] Table 2 Dynamic defluorination results of lanthanum chloride modified zeolite with different concentrations

[0067]

[0068] According to Table 2, the effective fluoride removal capacity increases with the increase of lanthanum chloride concentration. When the concentration is 2-10wt%, the fluorine removal capacity does not increase significantly, and when it reaches 15wt%, the fluoride removal capacity increases obviously, and the concentration of lanthanum chloride does not change significantly when the concentration is 15wt% to 20wt%, so the selected concentration is 15wt% chlorine Lanthanum chloride solution for zeolite modific...

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Abstract

The invention discloses a preparation method of lanthanum oxide-carrying zeolite for removing fluorine, which comprises the following steps: adding a lanthanum chloride solution into raw material zeolite, and regulating the pH value of the solution with 28wt% of concentrated ammonia; after soaking and stirring, removing the filtered solution, drying and burning at high temperature; and after cooling, cleaning residual lanthanum ions, and drying to obtain the lanthanum oxide-carrying zeolite. The lanthanum oxide-carrying zeolite prepared by the method of the invention has strong fluorine adsorbing capacity and good fluorine removing effect, can not cause secondary pollution, can be used for removing fluorine in a static adsorption mode, can be filled into a packed column for removing fluorine in a dynamic adsorption mode, is suitable for water quality of different concentration and different hardness, is suitable for removing fluorine in drinking water, is suitable for deeply removing fluorine in high-concentration fluorine-containing waste water, can be recycled, and has simple and easy regeneration method and high regeneration efficiency.

Description

technical field [0001] The invention relates to the field of preparation of modified zeolite, in particular to a preparation method of lanthanum oxide-loaded zeolite used for removing fluorine. Background technique [0002] Fluorine widely exists in nature and is one of the essential trace elements for human body. An appropriate amount of fluorine plays an important role in human health, preventing dental caries and increasing bone hardness; but excessive intake can cause fluorosis, not only easy to cause dental fluorosis and bone disease, but also can cause human organs, nerves, etc. Systemic and cell membrane damage. The suitable fluoride concentration for drinking water is 0.5mg / L~1.0mg / L. my country's drinking water hygiene standard GB5949-2006 clearly stipulates that the limit of fluoride in drinking water is 1.0mg / L. [0003] China is one of the countries in the world where drinking-water endemic fluorosis is most prevalent and harmful. Fluoride-containing groundwa...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/32C02F1/28C02F1/58
Inventor 陈红红黄丽玫毋福海白研陈漫霞
Owner GUANGDONG PHARMA UNIV
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