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Preparation method of adsorption and catalysis material for removing heavy metals and organic pollutants in municipal sludge

A technology for organic pollutants and municipal sludge, applied in the field of adsorption-visible light catalytic composite functional material preparation, can solve the problems of low visible light utilization efficiency, nano-pollution, easy agglomeration, etc. Good adsorption capacity, easy to use effect

Inactive Publication Date: 2014-10-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used powder TiO 2 Catalysts have defects such as low utilization efficiency of visible light, easy agglomeration, difficult recycling, and possible nano-pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Using corncobs as raw materials, crush them into particles with a particle size of less than 2 mm. According to the mass ratio of biomass and phosphoric acid of 1:2, soak corncob powder in phosphoric acid solution for 24 hours, and filter to obtain material A.

[0021] (2) Mix tetra-n-butyl titanate and absolute ethanol at a volume ratio of 1:1 at room temperature, and stir for 0.5 h to obtain a uniform and transparent yellow solution B.

[0022] (3) Mix material A and yellow solution B at a ratio of 1:1 by mass and volume, age for 24 hours, heat up to 500°C for 2 hours under air-isolated conditions, cool to room temperature, and grind to a size no less than 100 mesh , that is loaded with P-TiO 2 biomass activated carbon material.

[0023] The dewatered sludge (water content 60%) of a city sewage treatment plant was selected as the sample for this implementation, Cr 6+ The content of PAHs is 1072.1 mg / kg, and the content of PAHs is 132.5 mg / kg. Add and mix evenly...

Embodiment 2

[0025] (1) Use peanut shells as raw materials, crush them into particles with a particle size of less than 2 mm, soak the peanut shell powder in phosphoric acid solution for 24 hours according to the mass ratio of biomass to phosphoric acid of 1:1, and filter to obtain material A.

[0026] (2) Mix tetra-n-butyl titanate and absolute ethanol at a volume ratio of 1:1 at room temperature, and stir for 1 hour to obtain a uniform and transparent yellow solution B.

[0027] (3) Mix material A and yellow solution B at a ratio of 1:1 by mass and volume, age for 24 hours, heat up to 550°C for 2 hours under air-isolated conditions, cool to room temperature, and grind to a size no less than 100 mesh , that is loaded with P-TiO 2 biomass activated carbon material.

[0028] The dewatered sludge (water content 60%) of a city sewage treatment plant was selected as the sample for this implementation, and the Pb 2+ The content of PAHs is 901.5 mg / kg, and the content of PAHs is 102.4 mg / kg. ...

Embodiment 3

[0030] (1) Using rice straw as raw material, crush it into particles with a particle size of less than 2 mm. According to the mass ratio of biomass and phosphoric acid of 1:1, soak rice straw powder in phosphoric acid solution for 24 hours, and filter to obtain material A.

[0031] (2) Mix tetra-n-butyl titanate and absolute ethanol at a volume ratio of 1:1 at room temperature, and stir for 1 hour to obtain a uniform and transparent yellow solution B.

[0032] (3) Mix material A and yellow solution B at a ratio of 1:1 by mass and volume, age for 24 hours, heat up to 450°C for 2 hours under air-isolated conditions, cool to room temperature, and grind to a size no less than 100 mesh , that is loaded with P-TiO 2 biomass activated carbon material.

[0033] The dewatered sludge (water content 60%) of a city sewage treatment plant was selected as the sample for this implementation. Cu 2+ 4 mg / kg。 The content of 5490.5 mg / kg, PAHs content of 99. 4 mg / kg. Add and mix evenly accord...

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Abstract

The invention relates to a preparation method of an adsorption-visible light catalysis material for removing heavy metals and persistent organic pollutants in municipal sludge, particularly to a biomass activated carbon supported P-TiO2 material with adsorption and visible light catalysis composite functions. Agricultural waste biomass, phosphoric acid and TiO2 are taken as main raw materials, under the airtight high-temperature pyrolysis condition, the phosphoric acid can be used as a biomass carbon activator and a TiO2 photo-catalysis dopant simultaneously, P-TiO2 can produce electrons-hole pairs under sunlight, when organic matters or metal ions are adsorbed on the surface of the P-TiO2, the electrons or holes can be obtained respectively, and corresponding redox reactions happen, so that the pollutants are removed. Meanwhile, the heavy metal ions in the sludge can be adsorbed and fixed by biomass activated carbon, so that the mobility and the bio-availability of the heavy metal ions are effectively reduced. The adsorption-visible light catalysis composite functional material prepared with the method has the characteristics of low price, high efficiency, wide application range, convenience in use and the like, and the risk of secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and recycling, and in particular relates to a preparation method of an adsorption-visible light catalysis composite functional material for removing heavy metals and persistent organic pollutants in urban sludge. Background technique [0002] With the acceleration of urbanization and the improvement of sewage treatment rate in our country, more and more sludge is produced every year. The treatment, disposal and resource utilization of urban sludge has become a hot spot in environmental engineering research. Most municipal sludge is rich in organic matter, nitrogen, phosphorus and other nutrients, and has good land use value. However, in addition to rich nutrients, sludge contains more or less heavy metals and persistent organic pollutants. , and the traditional composting process is difficult to effectively remove the above pollutants, making the sludge cause secondary pollution of t...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01J27/18C02F11/00
CPCY02W10/37
Inventor 王学江陈杰马荣生王鑫张晶黄嘉瑜颜湘波卜云杰马嵩奔特万赵建夫
Owner TONGJI UNIV
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