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Composite silver-titanium catalyst preparation method

A catalyst, silver-titanium technology, applied in the field of preparation of composite silver-titanium catalysts, can solve the problems of easy separation, inability to fully exert degradation efficiency, and insufficient material binding.

Inactive Publication Date: 2013-02-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional composite method is to use a certain substance as the matrix, and then load another substance on the matrix through physical contact. The two substances are not tightly combined, easy to separate, and cannot fully exert the degradation efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh a certain mass of silver nitrate, titanium tetranitrate and urea to make a solution, so that Ag + 、Ti 4+ , The molar ratio of urea is 2:1:10, the configured Ag + 、Ti 4+ The total ion concentration was 6mol / L, and then the prepared solution was poured into a hydrothermal kettle, and the hydrothermal kettle was placed in an oven at 130°C for crystallization for 36 h. Cool to room temperature, filter and wash until neutral, and dry the filter cake at 80°C for 12 hours to obtain silver-titanium hydrotalcite; calcinate the obtained solid at 550°C for 3 hours to prepare a layered composite silver-titanium catalyst.

[0015] Add 0.5 g of the obtained composite silver-titanium catalyst to 500 mL of acidic red wastewater with a concentration of 40 mg / L, react for 25 min under the irradiation of a 500w metal halide lamp, and the decolorization rate is 97.6%. The catalyst can be reused after separation.

Embodiment 2

[0017] Weigh a certain mass of silver nitrate, titanium tetranitrate and urea to make a solution, so that Ag + 、Ti 4+ , The molar ratio of urea is 4:1:10, the configured Ag + 、Ti 4+ The total ion concentration was 4mol / L, and then the prepared solutions were poured into hydrothermal kettles, and the hydrothermal kettles were placed in an oven at 120°C for crystallization for 24 h. Cool to room temperature, filter and wash until neutral, dry the filter cake at 90 °C for 8 h to obtain silver titanium hydrotalcite; roast the obtained solid at 450 °C for 4 h to prepare a layered composite silver titanium catalyst.

[0018] Add 0.5 g of the obtained composite silver-titanium catalyst to 500 mL of Jincheng 7 wastewater with a concentration of 40 mg / L, react for 25 minutes under the irradiation of a 500w metal halide lamp, and the decolorization rate is 98.3%. The catalyst can be reused after separation .

Embodiment 3

[0020] Weigh a certain mass of silver nitrate, titanium tetranitrate and urea to make a solution, so that Ag + 、Ti 4+ , The molar ratio of urea is 3:1:10, the configured Ag + 、Ti 4+ The total ion concentration was 5 mol / L, and then the prepared solutions were poured into hydrothermal kettles, and the hydrothermal kettles were placed in an oven at 125°C for crystallization for 28 h. Cool to room temperature, filter and wash until neutral, and dry the filter cake at 85°C for 10 h to obtain silver-titanium hydrotalcite; calcinate the obtained solid at 500°C for 4 h to prepare a layered composite silver-titanium catalyst.

[0021] Add 0.5 g of the obtained composite silver-titanium catalyst to 500 mL of rose bengal B wastewater with a concentration of 40 mg / L, react for 25 min under the irradiation of a 500w metal halide lamp, and the decolorization rate is 96.9%. The catalyst can be reused after separation .

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Abstract

The present invention discloses a composite silver-titanium catalyst preparation method, and belongs to the field of sewage treatment. The preparation method comprises: weighing a certain mass of silver nitrate, a certain mass of titanium tetranitrate and a certain mass of urea, and preparing into a solution, wherein a molar ratio of Ag<+> to Ti<4+> to urea is 2:1:10-4:1:10, and the total concentration of Ag<+> ions and Ti<4+> ions in the solution is 4-6 mol / L; pouring the solution to a hydrothermal kettle, placing the hydrothermal kettle in an oven to carry out crystallization for 24-36 h at a temperature of 120-130 DEG C; cooling to a room temperature; carrying out suction filtration washing to achieve a neutral state; drying filter cake for 8-12 h at a temperature of 80-90 DEG C to obtain silver-titanium type hydrotalcite; and carrying out calcination on the silver-titanium type hydrotalcite for 3-4 h at a temperature of 450-550 DEG C to prepare the layered composite silver-titanium catalyst with characteristics of nanometer effect and absorption promotion.

Description

technical field [0001] The invention relates to a preparation method of a composite silver-titanium catalyst, which belongs to the technical field of sewage treatment in environmental protection. Background technique [0002] Traditional water treatment methods have problems such as low efficiency, high cost, and secondary pollution, and sewage treatment has not been well resolved. The development and application of nanotechnology is likely to completely solve this problem. TiO was discovered in 1972 2 High oxidation activity, good chemical stability, non-toxic to the human body, low cost, no pollution, wide application range, so it is the most important, but TiO 2 The bandgap width is large (such as anatase TiO 2 The forbidden band width Eg=3.2 eV), can only absorb light in the ultraviolet region (wavelength less than 387 nm), and has low utilization efficiency of solar energy. [0003] As an important part of nanomaterials, nano-noble metals have broad application pros...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J35/02C02F1/30
CPCY02W10/37
Inventor 马建锋邹静李定龙杨彦
Owner CHANGZHOU UNIV
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