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Preparation method of alpha-FeOOH/GAC catalyst and application thereof in degradation of nitrobenzene wastewater in supergravity field

A catalyst and high-gravity technology, applied in one or more application fields, can solve problems such as uneven crystal nucleation and growth, low ozone utilization rate, and difficult to control morphology, and achieve surface hydroxyl richness, surface area and surface hydroxyl density. The effect of improving and uniform shape

Active Publication Date: 2020-09-22
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention aims at the problems of uneven crystal nucleation and growth, wide particle size distribution, and difficulty in controlling the morphology of crystals prepared by the current oxidation precipitation method, as well as the problems of low

Method used

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  • Preparation method of alpha-FeOOH/GAC catalyst and application thereof in degradation of nitrobenzene wastewater in supergravity field
  • Preparation method of alpha-FeOOH/GAC catalyst and application thereof in degradation of nitrobenzene wastewater in supergravity field
  • Preparation method of alpha-FeOOH/GAC catalyst and application thereof in degradation of nitrobenzene wastewater in supergravity field

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Example 1: Using figure 1 The flow shown is to prepare the supported α-FeOOH / GAC catalyst. Prepare FeSO with a molar ratio of 1:4 at 0.25 mol / L 4 solution and NaOH solution 1L each, filtered to remove particulate impurities, preheated to 25°C, and added to FeSO 4 solution tank 1 and NaOH solution tank 2.

[0055] It is sent into the impinging flow rotating packed bed 5 under the action of a centrifugal pump, the flow rate is 60 L / h, the rotation speed is set at 800 rpm, and air is introduced at a gas velocity of 10 L / h. Cycle the reaction until the potassium dichromate solution detects no Fe 2+ exist. The resulting FeOOH slurry was transferred to a beaker.

[0056] Spherical activated carbon particles with a diameter of 1-2mm were washed with ultrapure water, soaked in 0.1mol / L HCL solution for 24 hours, ultrasonically treated for 30 minutes, washed with deionized water until neutral, and dried overnight at 80°C. Add 10 g of activated carbon into the FeOOH slurry,...

Embodiment 2

[0057] Example 2: Using figure 1 The process shown is to prepare iron oxyhydroxide and supported activated carbon catalyst. Configure FeSO with a molar ratio of 2:1 at 0.25mol / L 4 solution and NaOH solution 1L each, filtered to remove particulate impurities, preheated to 25°C, and added to FeSO 4 solution tank 1 and NaOH solution tank 2. Under the action of the centrifugal pump 3, it is sent into the impinging flow rotating packed bed 5, the flow rate is 60 L / h, the speed is set at 400 rpm, and air is introduced at a gas velocity of 10 L / h. Cycle the reaction until the potassium dichromate solution detects no Fe 2+ exist. The resulting FeOOH slurry was transferred to a beaker. Spherical activated carbon particles with a diameter of 1-2mm were washed with ultrapure water, soaked in 0.1mol / L HCL solution for 24 hours, ultrasonically treated for 30 minutes, washed with deionized water until neutral, and dried overnight at 80°C. Add 10 g of activated carbon into the FeOOH sl...

Embodiment 3

[0058] Example 3: Using figure 1 The process shown is to prepare iron oxyhydroxide and supported activated carbon catalyst. Configure FeSO with a molar ratio of 1:1 at 0.25mol / L 4 Solution and NaOH solution 1L each, filter to remove particulate impurities, preheat to 25°C, add FeSO 4 solution tank 1 and NaOH solution tank 2. Under the action of the centrifugal pump 3, it is sent into the impinging flow rotating packed bed 5, the flow rate is 60 L / h, the speed is set at 400 rpm, and air is introduced at a gas velocity of 5 L / h. Cycle the reaction until the potassium dichromate solution detects no Fe 2+ exist. The resulting FeOOH slurry was transferred to a beaker. Spherical activated carbon particles with a diameter of 1-2mm were washed with ultrapure water, soaked in 0.1mol / L HCL solution for 24 hours, ultrasonically treated for 30 minutes, washed with deionized water until neutral, and dried overnight at 80°C. Add 10 g of activated carbon into the FeOOH slurry, stir and...

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Abstract

The invention belongs to the technical field of supported catalyst preparation and wastewater treatment, and provides a preparation method of an alpha-FeOOH/GAC catalyst and an application thereof indegradation of nitrobenzene wastewater in a supergravity field, aiming at the problems of non-uniform particle size, wide particle size distribution, difficult morphology control, efficient and thorough degradation of nitrobenzene wastewater and the like of crystals prepared by an existing oxidation precipitation method. FeOOH is rapidly prepared in batches by a supergravity technology coupled with an oxidation precipitation method, is cured and is loaded on activated carbon. The obtained catalyst is uniform in morphology, rich in surface hydroxyl and narrow in particle size distribution, andcan be produced in batches. The supported heterogeneous catalyst is used as a filler, and the nitrobenzene wastewater is treated by a method coupling supergravity with heterogeneous ozone oxidation. Rich hydroxyl groups on the surface of the catalyst can participate in chain decomposition of ozone in water, so that the generation of more .OH is promoted, and the mineralization rate of degraded organic matters is improved. The degradation of target organic matters and the deepening of mineralization degree are realized, and the subsequent biodegradability is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of supported catalysts and wastewater treatment, and in particular relates to a preparation method of α-FeOOH / GAC catalyst and its application in degrading nitrobenzene wastewater in a supergravity field. Activated carbon catalyst, which is prepared by using high gravity technology, and used as a filler to heterogeneously catalyze ozone to degrade nitrobenzene wastewater in a high gravity field. Background technique [0002] Nitrobenzene (NB) is an important chemical intermediate, which is widely used in petrochemical, pharmaceutical, dyestuff, explosives and other fields. The large amount of nitrobenzene wastewater discharged during the production process of these industries has caused serious pollution to the environment. Nitrobenzene has strong teratogenic, carcinogenic and mutagenic effects. At the same time, because the nitro group has a strong electron-withdrawing ability, the benzene r...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J35/02B01J35/10C02F1/78C02F101/38
CPCB01J23/745B01J35/023B01J35/1023C02F1/78C02F1/725C02F2101/38
Inventor 焦纬洲李鹏阳刘有智祁贵生袁志国张巧玲
Owner ZHONGBEI UNIV
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