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Calixarene porous polymer with ultra-high removal rate and ultra-high adsorption capacity and application of calixarene porous polymer to selective separation of dyes

A porous polymer, adsorption capacity technology, applied in the fields of alkali metal compounds, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of thermal instability, limited development of calixarene-based POPs, low adsorption rate, etc.

Pending Publication Date: 2022-02-25
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past few years, people have designed and synthesized many POPs with different structural units, but the calixarene-based POPs currently used for the removal of organic dyes usually have high adsorption capacity, but relatively low adsorption rate and no selectivity. , even thermally unstable, which greatly limits the further development of calixarene-based POPs

Method used

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  • Calixarene porous polymer with ultra-high removal rate and ultra-high adsorption capacity and application of calixarene porous polymer to selective separation of dyes
  • Calixarene porous polymer with ultra-high removal rate and ultra-high adsorption capacity and application of calixarene porous polymer to selective separation of dyes
  • Calixarene porous polymer with ultra-high removal rate and ultra-high adsorption capacity and application of calixarene porous polymer to selective separation of dyes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis of monomer: Pour resorcinol (0.55 g, 5 mmol) and absolute ethanol (25 mL) into a 200 mL flask, then add concentrated hydrochloric acid (3.5 mL, 12 M, Adding time is 10 minutes), then dissolve p-hydroxybenzaldehyde (0.61g, 5mmol) in 10mL of absolute ethanol, and add dropwise to the above reaction system in 5 minutes. After dropping, remove the ice bath, and heat to reflux for 12 hours while stirring conventionally. After the reaction was completed, the mixture was cooled to room temperature and filtered, and then the filter cake was washed with anhydrous methanol, acetone and ether and dried under vacuum at 60°C to obtain a monomer with a yield of 40%. The structural formula is shown in figure 1 f. 1 H NMR (400MHz, DMSO- d 6 , ppm): δ 7.78 (s, 1H), 7.38 (s, 2H), 5.58 (d, J = 7.6 Hz, 2H),5.41 (dd, J = 21.1, 13.4 Hz , 3H), 5.02 (s, 1H ), 4.46 (s, 1H).

[0032] Synthesis of POP-10F: The monomer (0.3 g, 0.35 mmol), potassium carbonate (0.41 g, 3 mmol) and anhy...

Embodiment 2

[0038] Example 2 Adsorption Kinetics

[0039] In the experiment, 15 mg of POP-8F or POP-10F was added to the dye solution (50 ppm, 30 mL), and then the mixture was stirred at room temperature at a rate of 600 rpm. At various time intervals, 3 mL of the solution was withdrawn and filtered through a 0.22 μm syringe filter to monitor the adsorption process. The UV-Vis spectrum of the filtrate was analyzed by a UV-Vis spectrophotometer, and the change of the maximum absorbance intensity was recorded to further analyze the adsorption kinetics. Adsorption kinetics were analyzed using pseudo-first-order and pseudo-second-order kinetic models.

[0040] Pseudo-first-order kinetic model:

[0041] Pseudo-second-order kinetic model:

[0042] where q e (mg g -1 ) is the equilibrium adsorption capacity; q t (mg g -1 ) is the adsorption capacity, the unit is t (min); k 1 (min -1 ) and k 2 (g mg -1 min -1 ) are constants for the pseudo-first-order and pseudo-second-order ...

Embodiment 3

[0047] Embodiment 3 adsorption thermodynamics

[0048] To evaluate the maximum adsorption capacity of POP-8F and POP-10F for different dyes, adsorption isotherm experiments were performed. In the test, 5 mg of adsorbent was added to 15 mL of dye solution and stirred until adsorption equilibrium was reached. UV-Vis spectrophotometry was then performed, and the dye concentration was calculated from the change in maximum absorbance intensity. Adsorption capacity (q e , mg g -1 ) is calculated according to the following formula:

[0049]

[0050] where C i and C e (mg L -1 ) is the initial concentration and final concentration of the target pollutant, m (g) is the weight of the adsorbent used in the adsorption experiment, and V (L) is the volume of the target pollutant solution.

[0051] The Langmuir adsorption isotherm model was used in this experiment.

[0052]

[0053] where q e (mg g -1 ) is the equilibrium adsorption capacity; K L is a constant of the Lang...

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Abstract

The invention discloses a calixarene porous polymer with ultra-high removal rate and ultra-high adsorption capacity and application of the calixarene porous polymer to selective separation of dyes. According to the invention, octafluoronaphthalene and decafluorobiphenyl are used as cross-linking agents, two calixarene-based porous polymers, namely POP-8F and POP-10F, are synthesized through simple and mild reaction without using a catalyst, show extraordinary adsorption capacity and adsorption rate on cationic dyes including rhodamine B (RhB), methylene blue (MB) and crystal violet (CV), and exceed those of all previously reported porous adsorbents. The calixarene-based porous polymers comprise COFs, MOFs, POPs, a biomass adsorbent, activated carbon and the like. More importantly, the calixarene-based POPs can effectively remove cationic dyes through simple column filtration, and shows excellent reusability. Because of the characteristics, the POP-8F and the POP-10F become porous adsorption materials which can be used for treating and purifying water pollutants.

Description

technical field [0001] The invention belongs to the environmental protection technology, and specifically relates to a calixarene-based porous polymer with superfast removal rate and superhigh adsorption capacity and its use in the selective separation of dyes. Background technique [0002] For organic dyes, several removal methods such as photocatalysis, membrane filtration, oxidative degradation, biological treatment and adsorption have been adopted in the prior art. Among them, adsorption has attracted more and more attention and recognition all over the world due to its unique advantages such as high removal efficiency, low cost, and simplicity. Common adsorbents include covalent organic frameworks (COFs), metal-organic frameworks (MOFs), Porous materials such as activated carbon, but there are problems such as difficult synthesis, high cost, instability, low adsorption rate and low capacity, which severely limit the development of adsorbents. Therefore, the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/36C08G8/04B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30C02F101/34C02F101/36C02F101/38
CPCC08G8/36C08G8/04B01J20/262B01J20/28054C02F1/285C02F2101/308C02F2101/34C02F2101/36C02F2101/38
Inventor 路建美徐庆锋
Owner SUZHOU UNIV
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