A kind of preparation method of floating band vanadium difluoride adsorbent
A technology of vanadium difluoride and adsorbent, which is applied in the field of preparation of floating strip-shaped vanadium difluoride adsorbent, can solve the problems of no synthesis method reported in literature, harsh reaction conditions, cumbersome procedures, etc., and achieve high adsorption activity, Low cost and good stability
Inactive Publication Date: 2018-05-22
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology
[0003] Vanadium difluoride, as a typical vanadium fluoride, has almost no literature reporting its synthesis method
This method has high cost, cumbersome process and harsh reaction conditions.
For this reason, C.Cros et al. (C.Cros et al.J.Fluorine.Chem, 1975,5 (5): 457-466) propose a kind of method that replaces the chlorine element in vanadium dichloride with fluorine element To synthesize vanadium difluoride, although this method reduces the reaction conditions to a certain extent, the cost is also very high
Method used
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Embodiment 1
[0016] At room temperature, take 30mL of pure water, pour it into a beaker, add 1.5mmol of ammonium fluoride under stirring conditions, then add 5mmol of vanadium pentoxide, stir thoroughly for 30min, and finally add the mixed solution to a polytetrafluoroethylene In a lined autoclave, heat water at 180°C for 24 hours, take the upper layer sample and wash it by centrifugation for 3 times, then dry it at 60°C.
[0017] Depend on figure 1 It can be seen that the vanadium difluoride adsorbent prepared by the present invention is in the shape of a band, with a length of 800 nm and a width of about 150 nm under SEM observation.
[0018] Depend on figure 2 It can be seen that compared with the XRD standard card (JCPDS: 36-0879), the phase of the strip-shaped vanadium difluoride prepared in Example 1 is not completely pure, and there is a small amount of impurity peaks, which are determined to be ammonium vanadate, which is Caused by the dissolution of vanadium pentoxide.
[0019...
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Abstract
The invention discloses a preparation method for a floating-type band-shaped vanadium difluoride adsorbent. The preparation method comprises the following steps of: 1) under a condition of stirring, adding 1.5mmol of ammonium fluoride into 30ml of water; 2) adding 5mmol of vanadium pentoxide, and stirring for 30min; 3) adding a mixed solution into an autoclave with a polytetrafluoroethylene liner, and performing hydrothermal reaction at a constant temperature for 24 hours; and 4) taking upper-layer samples from a product obtained in the step (3), centrifugalizing, washing and drying, thereby obtaining the difluoride adsorbent. The difluoride adsorbent prepared by the invention is simple, low in cost, and good in reproducibility and stability; the difluoride adsorbent has relatively high activity, is capable of automatically floating on the surface of a water body after adsorbing methylene blue wastewater solution, and can be easily separated from the water body.
Description
technical field [0001] The invention relates to a preparation method of a vanadium difluoride adsorbent, in particular to a preparation method of a floating belt-shaped vanadium difluoride adsorbent. Background technique [0002] At present, human beings are facing two very serious problems of energy and environment, especially the environmental problems caused by toxic organic pollutants (such as polycyclic aromatic hydrocarbons, polychlorinated biphenyls, pesticides, dyes, etc.), which have become a major threat to human survival and health. major problem. Adsorption technology is a simple and low-cost pollutant separation and enrichment technology. The design and preparation of low-cost and high-performance adsorbents has become one of the keys to the application of this technology; in addition, the efficient separation of adsorbents and wastewater after adsorption is also a difficult point in wastewater treatment. [0003] Vanadium difluoride, as a typical vanadium flu...
Claims
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IPC IPC(8): B01J20/30B01J20/02C02F1/28C02F101/30
CPCB01J20/027C02F1/281C02F2101/308
Inventor 滕飞徐琦余东方杨利权滕怡然杨豪
Owner NANJING UNIV OF INFORMATION SCI & TECH