Calcined anionic clay visible-light catalyst and preparation method and purposes thereof

An anionic clay, visible light technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as long degradation time, achieve short degradation time and cost The effect of low cost and easy industrial production

Active Publication Date: 2013-04-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its characteristic is that the light source used is ultraviolet light, and the degradation rate reaches 94.4% after 12 hours of reaction; it needs to use certain equipment to provide ultraviolet light source and the degradation time is long, which has certain limitations in industrial application

Method used

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  • Calcined anionic clay visible-light catalyst and preparation method and purposes thereof
  • Calcined anionic clay visible-light catalyst and preparation method and purposes thereof
  • Calcined anionic clay visible-light catalyst and preparation method and purposes thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] NiZnAl-2 type calcined anionic clay visible light catalyst, prepared by the following steps:

[0032] (1) Weigh 0.02mol (5.82g) Ni(NO 3 ) 2 ·6H 2 O, 0.04mol (11.90g) Zn (NO 3 ) 2 ·6H 2 O and 0.02mol (7.50g) Al(NO 3 ) 3 Mixed, in the mixture (Ni 2+ +Zn 2+ ) and Al 3+ The molar ratio is equal to 3, Zn 2+ with you 2+ The mole of is equal to 2;

[0033] Prepare 3 parts of the above mixture, labeled as samples A, B, C respectively. Then weigh CO(NH 2 ) 2 0.2mol (12.01g), 0.5mol (30.03g), 0.6mol (36.04g) were added to samples A, B, and C. CO(NH 2 ) 2 with Al 3+ The molar ratio of is equal to 10, CO(NH 2 ) 2 with Al 3+ The molar ratio of is equal to 25, CO(NH 2 ) 2 with Al 3+ The molar ratio is equal to 30.

[0034] Samples A, B, and C were placed in three 500mL beakers, respectively, and 250mL of deionized water were added, and the beakers were placed in a 50kHz ultrasonic scrubber for 10 minutes to obtain a clear mixed solution.

[0035] (2) The mix...

Embodiment 2

[0038] NiZnAl-3 calcined anionic clay visible light catalyst, prepared by the following steps:

[0039] (1) Weigh 0.015mol (4.36g) Ni(NO 3 ) 2 ·6H 2 O, 0.045mol (13.39g) Zn (NO 3 ) 2 ·6H 2 O, 0.02mol (7.50g) Al(NO 3 ) 3 , 0.5mol (30.03g) CO (NH 2 ) 2 , where (Ni 2+ +Zn 2+ ) and Al 3+ The molar ratio is equal to 3, Zn 2+ with you 2+ The mole is equal to 3, CO(NH 2 ) 2 with Al 3+The molar ratio is equal to 25, put the weighed reagent in a 500mL beaker, add 250mL deionized water, place the beaker in a 50kHz ultrasonic scrubber for 10min, and obtain a clear mixed solution.

[0040] (2) Transfer the mixed solution into a 500mL three-neck flask, heat hydrolysis at 100°C, and reflux for aging for 48 hours. The turbid solution is naturally cooled to room temperature for 2 hours. The measured pH value is 6.0, centrifuged at 4000rpm for 5 minutes, and the supernatant is removed to obtain NiZnAl The weakly acidic precipitation of layered double hydroxide, the obtained sa...

Embodiment 3

[0045] NiZnAl-4 type calcined anionic clay visible light catalyst, prepared by the following steps:

[0046] (1) Weigh 0.008mol (2.33g) Ni(NO 3 ) 2 ·6H 2 O, 0.032mol (9.52g) Zn (NO 3 ) 2 ·6H 2 O, 0.02mol (7.50g) Al(NO 3 ) 3 With 0.5mol (30.03g) CO (NH 2 ) 2 mixed, marked as sample A, where (Ni 2+ +Zn 2+ ) and Al 3+ The molar ratio of Zn is equal to 2, Zn 2+ with you 2+ The mole is equal to 4, CO (NH 2 ) 2 with Al 3+ The molar ratio of is equal to 25;

[0047] Weigh 0.012mol (3.49g) Ni(NO 3 ) 2 ·6H 2 O, 0.048mol (14.28g) Zn (NO 3 ) 2 ·6H 2 O, 0.02mol (7.50g) Al(NO 3 ) 3 With 0.5mol (30.03g) CO (NH 2 ) 2 mixed, marked as sample B, where (Ni 2+ +Zn 2+ ) and Al 3+ The molar ratio is equal to 3, Zn 2+ with you 2+ The mole is equal to 4, CO (NH 2 ) 2 with Al 3+ The molar ratio of is equal to 25;

[0048] Weigh 0.02mol (5.82g) Ni(NO 3 ) 2 ·6H 2 O, 0.08mol (23.80g) Zn (NO 3 ) 2 ·6H 2 O, 0.02mol (7.50g) Al(NO 3 ) 3 With 0.5mol (30.03g) CO (NH ...

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Abstract

The invention discloses a calcined anionic clay visible-light catalyst and a preparation method and purposes thereof. The catalyst is prepared by the following steps of preparing mixed solution of metal salts and urea; heating the mixed solution to the temperature of between 100 and 120 DEG, reacting for 36 to 54 h, and obtaining acidic turbid liquid of which the pH value is between 6.0 and 6.5; centrifuging the acidic turbid liquid, taking precipitation out, washing the precipitation by deionized water until the pH value is neutral, and dewatering and drying; and grinding the dried precipitation, calcining the precipitation at the temperature of between 400 and 900 DEG C for 4 to 6 h, and thus obtaining the calcined anionic clay visible light catalyst, wherein the metal salts comprise divalent metal salts and trivalent metal salts. The prepared calcined anionic clay visible light catalyst can catalytically degrade organic wastewater in visible light, ultraviolet light equipment is not required, a feeding ratio is low, the degradation time is short, and the calcined anionic clay visible-light catalyst has low energy consumption and high efficiency and is suitable for the treatment of medium and low-concentration industrial wastewater.

Description

technical field [0001] The invention relates to a calcined anionic clay visible light catalyst as well as its preparation method and application. Background technique [0002] With the development of printing and dyeing industry, the amount of wastewater discharged into the environment by printing and dyeing factories is also increasing. Among the treatment methods of printing and dyeing wastewater, photocatalytic oxidation has attracted widespread attention due to its characteristics of easy operation, low cost, and environmental friendliness. [0003] In recent years, photocatalysts have evolved from traditional semiconductors such as TiO 2 , ZnO, etc. are gradually developing towards anionic clays such as ZnAl-LDHs and MgZnAl-LDHs. Anionic clay, also known as layered double hydroxide or hydrotalcite compound, is a type of anionic layered compound with a positively charged cationic double-layer structure as the main body, with exchangeable anions or interlayer water betw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C02F1/30
Inventor 吴平霄王小蓉朱能武党志
Owner SOUTH CHINA UNIV OF TECH
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