CN103447090A - P-methyl benzoic acid uranyl complex photocatalyst - Google Patents

Abstract

The invention discloses a uranyl p-toluate complex photocatalyst, the photocatalyst molecular formula of the uranyl p-toluate complex is [(UO ₂ )(C ₂ H ₆ SO)(p-CH ₃ - C ₆ H ₄ –COO) ₂ ] ₂ , where p–CH ₃ –C ₆ H ₄ –COOH is p-toluic acid; the photocatalyst of the p-toluic acid uranyl complex can degrade dyes and organic pollutants , and the uranyl p-toluate complex photocatalyst can be recovered and reused by centrifugal separation, so as to avoid secondary pollution that may be caused by the catalyst.

Description

A kind of uranyl p-toluate complex photocatalyst

technical field

The invention relates to a photocatalyst, in particular to a photocatalyst of p-toluic acid uranyl complex.

Background technique

With the development of industrial processes, people's living standards have been greatly improved, but at the same time, it has also brought destructive effects on the environment on which people live. Every year, a large amount of harmful substances such as dyes, hormones, and pesticide residues that pose a great threat to our health are continuously discharged into rivers, lakes and seas. These harmful substances have brought a great impact on the survival of organisms. How to remove toxic substances such as dyes in industrial wastewater with low energy consumption, low consumption and high efficiency has become the focus of attention, and using photocatalysts to solve this problem is undoubtedly the best choice. Since photocatalytic technology has the potential application of directly using solar energy to solve the problems of energy depletion and global environmental pollution, the preparation of photocatalysts has aroused great interest. Regarding the problem of environmental pollution, environmental scientists from various countries have conducted extensive and in-depth explorations in the field of photocatalysis, and have achieved many gratifying achievements, which have been applied in environmental protection. In particular, photocatalytic technology can degrade many organic pollutants in water into simple inorganic substances such as CO ₂ and H ₂ O. It has low energy consumption, simple operation, mild reaction conditions, and the catalyst can be recycled and reused without secondary pollution and decomposition. The advantages such as fast speed have become a new high-efficiency and energy-saving environmental pollution control technology. For example, the invention patent application with the publication number CN1618518 discloses a composite photocatalyst using _TiO2 and ZnO as raw materials, which can be used to control environmental pollution. To solve this problem, the present invention develops a uranyl complex photocatalyst with good photocatalytic degradation performance.

Contents of the invention

The technical problem to be solved by the invention is to provide a uranyl p-toluate photocatalyst capable of degrading dyes and organic pollutants.

The technical scheme adopted by the present invention to solve the above technical problems is: a photocatalyst of uranyl p-toluate complex, the molecular formula of which is [(UO ₂ )(C ₂ H ₆ SO)(p-CH ₃ -C ₆ H ₄ -COO) ₂ ] ₂ , where p-CH ₃ -C ₆ H ₄ -COOH is p-toluic acid.

β=99.13(3)°。为单斜晶系，属于C2/c空间群。The unit cell parameters of the uranyl p-toluate complex photocatalyst crystal are:

β=99.13(3)°. It is monoclinic and belongs to C2/c space group.

Compared with the prior art, the present invention has the advantage of a photocatalyst of uranyl p-toluate complex, the molecular formula of the photocatalyst is [(UO ₂ )(C ₂ H ₆ SO)(p-CH ₃ - C ₆ H ₄ -COO) ₂ ] ₂ , in the molecular formula, C ₂ H ₆ SO is dimethyl sulfoxide, and p-CH ₃ -C ₆ H ₄ -COOH is p-toluic acid. The uranyl p-toluate complex photocatalyst can degrade dyes and organic pollutants, and the uranyl p-toluate complex photocatalyst can be recovered and reused by centrifugal separation to avoid secondary pollution that may be caused by the catalyst .

Description of drawings

Fig. 1 is the molecular structure figure of photocatalyst of the present invention;

Fig. 2 is the contrast figure of the PXRD collection of illustrative plates of photocatalyst of the present invention and single crystal simulation PXRD collection of collections;

Fig. 3 is a graph showing photocatalytic degradation of rhodamine B by the photocatalyst of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example 1

Weigh 0.5mmol of uranyl acetate (UO ₂ Ac ₂ 2H ₂ O) and dissolve it in 10mL of H ₂ O to obtain a yellow solution, and weigh 1.5mmol of p-toluic acid (p-CH ₃ -C ₆ H ₄ -COOH) was dissolved in 20mL of water and methanol mixed solvent (V/V=1:1), stirred to dissolve, and then 0.5mL NaOH (1M) was added; the above two solutions were mixed and stirred, the solution became cloudy, and then dripped Add 0.5mL NaOH (1M) and stir, filter to obtain a light yellow clear solution, the measured pH = 5.47, add dropwise 0.5mL dimethyl sulfoxide (C ₂ H ₆ SO), and obtain a yellow product after 2 months. The yellow product is a uranyl p-toluate photocatalyst with the molecular formula [(UO ₂ )(C ₂ H ₆ SO)(p-CH ₃ -C ₆ H ₄ -COO) ₂ ] ₂ . Grind the yellow product into powder, place it in a photocatalyst reactor, inject the aqueous solution containing Rhodamine B into it, turn on the agitator, and under the irradiation of 500W ultraviolet light from a xenon lamp, the Rhodamine B in the aqueous solution can be degraded by 94.1% in 200 minutes. %, is basically degraded completely, and the photocatalytic degradation curve shown in Figure 3 is obtained. It can be seen from Figure 3 that in the case of no catalyst under the irradiation of a 500W xenon lamp, Rhodamine B does not degrade without adding the above-mentioned catalyst. Adding the above-mentioned catalyst Rhodamine B was degraded obviously, and after 200 minutes, it was basically degraded completely. Uranyl complex photocatalysts can be recovered and reused by centrifugation. A Bruker D8Focus powder diffractometer with a 2θ angle range of 5–50° was used to scan the uranyl complex photocatalyst at a scanning speed of 8°/min. The powder diffraction pattern (PXRD) of the sample was collected at room temperature, and compared with a single The comparison of the crystal simulation PXRD patterns can be perfectly fitted, indicating that the product is a pure phase with a purity of not less than 99%.

Example 2

It is basically the same as Example 1, except that uranyl acetate is replaced by uranyl nitrate, p-toluic acid is 1mmol, NaOH (1M) is added dropwise 0.5mL twice, each 0.25mL, dimethyl The amount of sulfoxide added dropwise was 1.0 mL. The aqueous solution of rhodamine B in the photocatalyst reactor was replaced by the aqueous solution of methylene orange or methylene blue.

Claims (2)

1. A uranyl p-toluate complex photocatalyst, characterized in that the molecular formula of the uranyl complex photocatalyst is [(UO ₂ )(C ₂ H ₆ SO)(p-CH ₃ -C ₆ H ₄ -COO) ₂ ] ₂ , where p-CH ₃ -C ₆ H ₄ -COOH is p-toluic acid. 2. a kind of uranyl p-toluate complex photocatalyst as claimed in claim 1, is characterized in that the unit cell parameter of the crystal of this uranyl p-toluate complex photocatalyst is:

β=99.13(3)°.

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