Preparation method of halogen bismuth oxide catalyst with photocatalytic activity

A photocatalytic activity, bismuth oxyhalide technology, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the problems of difficulty in controlling the particle size of bismuth oxyhalide, poor uniformity, etc., and achieves a simple and easy production method and mild conditions. , the effect of improving the crystallinity

Inactive Publication Date: 2012-09-19
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
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Problems solved by technology

High temperature solid phase method (Su Mianzeng. LaOBr-BiOCl system and its luminescence[J]. Chemical Journal of Chinese Universities , 1982, 5: 12-15.) The operation is relatively simple, but the particle size of the prepared bismuth oxyhalide is difficult to control, and the uniformity is relatively poor

Method used

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  • Preparation method of halogen bismuth oxide catalyst with photocatalytic activity
  • Preparation method of halogen bismuth oxide catalyst with photocatalytic activity
  • Preparation method of halogen bismuth oxide catalyst with photocatalytic activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh a certain amount of 0.9701 g (0.002 mol) Bi(NO 3 ) 3 ·5H 2 O dissolved in 15 mL 1.2 mol / L HNO 3 , slowly add it dropwise to the homogeneous solution formed by hexadecyl pyridinium sulfate and NaCl containing the same amount of substances (0.003 mol), satisfying that the ratio of bismuth ions to chloride ions is 1:1.5, drop A large number of white precipitates were produced during the addition process, then the solution was adjusted to the required pH of 7 with 6 mol / L NaOH, and then continued to stir for 1 h, then poured into the reaction kettle, reacted at 170 °C for 17 h, filtered the sample and washed with distilled water Wash with absolute ethanol several times, dry at 50 °C under air condition, and then grind to obtain BiOCl.

Embodiment 2

[0029] Weigh a certain amount of 0.9701 g (0.002 mol) Bi(NO 3 ) 3 ·5H 2 O dissolved in 15 mL 1.2 mol / L HNO 3 , slowly add it dropwise to the homogeneous solution formed by hexadecyl pyridinium sulfate and NaBr containing the same amount of substances (0.003 mol), satisfying that the ratio of bismuth ions to bromide ions is 1:1.5, drop A large number of light yellow precipitates were produced during the addition process, then the solution was adjusted to the required pH of 7 with 6 mol / L NaOH, and then stirred for 1 h, then poured into the reaction kettle, reacted at 170 °C for 17 h, filtered the sample and used BiOBr was obtained by washing with distilled water and absolute ethanol several times, drying at 50 °C under air condition, and then grinding.

Embodiment 3

[0031] Weigh a certain amount of 0.9701 g (0.002 mol) Bi(NO 3 ) 3 ·5H 2 O dissolved in 15 mL 1.2 mol / L HNO 3 , slowly add it dropwise to the homogeneous solution formed by hexadecyl pyridinium sulfate and NaI containing the same amount of substances (0.003 mol), satisfying that the ratio of bismuth ions to iodide ions is 1:1.5, drop A large amount of reddish-brown precipitates were produced during the addition process, then the solution was adjusted to the required pH of 7 with 6 mol / L NaOH, and then stirred for 1 h, then poured into the reaction kettle, reacted at 170 °C for 17 h, filtered the sample and used BiOI was obtained by washing with distilled water and absolute ethanol several times, drying at 50 °C under air condition, and then grinding.

[0032] The BiOCl synthesized by this method is a white solid powder, the BiOBr is a light yellow solid powder, and the BiOI is an orange-red solid powder, all of which have no special smell.

[0033] The XRD (X-ray powder dif...

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Abstract

The invention relates to a preparation method of a halogen bismuth oxide catalyst with photocatalytic activity. Aqueous solution of cationic surfactant and sodium halide NaX (X is Cl, Br or I) which are equivalent in amount of substance is mixed with aqueous solution of bismuth nitrate, the pH value is controlled to be 5-8, the mixture is heated for 16-18 hours for reaction at the temperature of 160-180 DEG C, and thus halogen bismuth oxide can be prepared. Compared with the traditional preparation method of the halogen bismuth oxide, the conditions are mild, the reaction process is simple, and the high-purity catalyst can be prepared via one-step reaction. In addition, the cationic surfactant cetyl sulfate pyridine with a stable pyridine ring is adopted, the preparation of the halogen bismuth oxide with a stable structure can be facilitated, the crystallinity, specific surface area and other structural characteristics of the halogen bismuth oxide can be improved, the photocatalytic activity of the halogen bismuth oxide can be greatly enhanced, and the halogen bismuth oxide has efficient catalytic activity for non-degradable macromolecular microcystin with a colorless heptapeptide ring.

Description

technical field [0001] The invention relates to a preparation method of a bismuth oxyhalide photocatalyst. Background technique [0002] With the continuous development of science and technology, environmental problems are becoming more and more serious, especially those organic pollutants that are difficult to degrade in nature and are extremely harmful to human body and nature, such as aflatoxin, dioxin, dyes, detergents, pesticides , plastic, etc. These organic substances are not easy to decompose after being ingested by organisms, they are concentrated and amplified along the food chain, and can migrate long distances in the atmospheric environment, which not only easily leads to global pollution, but also is carcinogenic, posing a serious threat to human survival, reproduction and sustainable development. Most pollutants are difficult to degrade by themselves, and certain catalysts are needed. Therefore, finding and preparing suitable high-activity catalysts has become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C01G29/00A62D3/38A62D101/20
Inventor 黄应平肖锋王伶俐方艳芬
Owner CHINA THREE GORGES UNIV
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