Novel adsorbent for removing fluorine ions in wastewater and preparation method

An adsorbent and fluoride ion technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of increasing adsorption capacity and adsorption rate, so as to improve hydraulic performance, improve economy, The effect of reducing usage

Inactive Publication Date: 2017-06-13
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

CeO 2 Loaded into the porous spherical silicon-based carrier, the adsorbent with high uniformity is obtained, which solves the problem of the adsorbent form, improves the strength of the adsorbent, and thus improves the hydraulic performance of the adsorbent; in addition, CeO 2 The nanocrystals are distributed in the pores of the carrier, which greatly increases the specific surface area, thereby increasing the CeO 2 The adsorption capacity and adsorption rate

Method used

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  • Novel adsorbent for removing fluorine ions in wastewater and preparation method
  • Novel adsorbent for removing fluorine ions in wastewater and preparation method
  • Novel adsorbent for removing fluorine ions in wastewater and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Weigh 25g of Ce(NO 3 ) 3 ·6H 2 O was placed in a 1000mL pear-shaped bottle, added to 200mL methanol, and stirred to completely dissolve it. Then add 20g of SiO 2 .

[0024] 2. Use a rotary evaporator to rotate the above mixture at 0.5 atmospheric pressure for 1 hour, and then let it stand at atmospheric pressure for 1 hour.

[0025] 3. After standing still, use a rotary evaporator to carry out vacuum distillation of the above mixture under a 66°C water bath. The decompression process should be carried out slowly until the methanol in the pear-shaped bottle is basically evaporated to dryness, leaving only solids.

[0026] 4. Put the solid in the pear-shaped bottle in a vacuum drying oven, and dry under vacuum at 40° C. overnight.

[0027] 5. Put the above dried solid in a muffle furnace and calcinate at 250°C for 3 hours to obtain light yellow CeO 2 / SiO 2 Adsorbent.

[0028] Implementation Case 2 Adsorption Experiment

[0029] CeO 2 / SiO 2 The adsorbent is...

Embodiment 3

[0030] Embodiment 3 regeneration experiment

[0031] 1. Add CeO 2 / SiO 2 The adsorbent is mixed with a solution with a pH of 3 and a fluoride ion solubility of 100mg / L at a solid-to-liquid ratio of 0.05g / 20mL, shaken in a water bath at 25°C for 5 hours, and then filtering the mixed solution to test the fluorine in the solution before and after adsorption. content, and then calculate the adsorption rate.

[0032] 2. The adsorbed CeO 2 / SiO 2 Dry the adsorbent, then mix it with 0.1mol / L NaOH solution at a solid-to-liquid ratio of 0.05g / 20mL, shake it in a water bath at 25°C for 5 hours, then filter the mixed solution, and test the fluorine content in the solution before and after desorption , and then calculate the desorption rate.

[0033] 3. The desorbed CeO 2 / SiO 2 The adsorbent was washed with distilled water until neutral, dried, and then re-adsorbed and desorbed according to steps 1 and 2, and cycled 4 times.

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Abstract

The invention belongs to the technical field of environment protection, and particularly relates to a novel adsorbent for removing fluorine ions in wastewater and a preparation method and a regeneration method thereof. The novel adsorbent consists of a porous spherical SiO2 (silicon dioxide) carrier and CeO2 (cerium dioxide), wherein the CeO2 is uniformly distributed in the pores of the special SiO2, so as to form a CeO2/SiO2 composite microsphere; the particle size of the microsphere of the novel adsorbent is 50 to 500 micrometers. The preparation method comprises the following steps of using an organic solvent to dissolve a cerium salt which can be dissolved into the organic solvent, so as to obtain a cerium salt solution; adding the porous SiO2 particles into the cerium salt solution, and evaporating the organic solvent, so as to obtain a cerium salt/SiO2 compound; drying the cerium salt/SiO2 compound, and calcining, so as to obtain the novel adsorbent. The novel adsorbent has the advantages that the novel adsorbent is suitable for large-scale industrialized application; after adsorbing and saturating, the adsorbent can be regenerated, so as to improve the economy; the adsorbing rate and hydraulic property are good. The novel adsorbent and the preparation method have good application prospect in the field of environment protection.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a novel adsorbent for removing fluorine ions in waste water, a preparation method and a regeneration method thereof. Background technique [0002] At present, the adsorption materials generally have the disadvantages of slow adsorption speed and small adsorption capacity, CeO 2 There is also the same problem. Existing preparation of CeO 2 The methods mainly include precipitation method, sol-gel method and electrochemical method. CeO prepared by precipitation method 2 There is a serious particle agglomeration phenomenon, which seriously hinders the increase of the specific surface area and reduces the adsorption capacity and adsorption rate; the sol-gel method is expensive and polluted, easy to harden, and the sol-gel process takes a long time; the electrochemical method Although the problem of agglomeration can be solved, the current yield is low,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/30B01J20/28B01J20/10C02F101/14
CPCC02F1/281B01J20/06B01J20/103B01J20/28002C02F2101/14
Inventor 仓冈悦周林锦王晓龙
Owner SHANGHAI JIAO TONG UNIV
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