Method for preparing photocatalyst with visible light response by mechanochemical treatment on polybrominated diphenyl ether solid waste

A polybrominated diphenyl ether, mechanochemical technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. Consumption and operating costs, low energy consumption, saving raw materials and costs

Active Publication Date: 2013-11-13
苏州清初环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Although the above studies have achieved good degradation effects, there are also many shortcomings: one is that the amount of ball milling reagent added is much higher than the actual demand for the reaction with pollutants to ensure that the reaction is complete, resulting in waste of additives; Although the pollutants are degraded, the bromine contained in them is difficult to reuse

Method used

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  • Method for preparing photocatalyst with visible light response by mechanochemical treatment on polybrominated diphenyl ether solid waste
  • Method for preparing photocatalyst with visible light response by mechanochemical treatment on polybrominated diphenyl ether solid waste
  • Method for preparing photocatalyst with visible light response by mechanochemical treatment on polybrominated diphenyl ether solid waste

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Experimental program
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Effect test

Embodiment 1

[0030] In order to explore Bi 2 o 3 As a ball milling additive, the degradation effect of PBDEs in the ball milling process was tested using traditional ball milling reagents CaO and Bi 2 o 3 Compare under the same material ratio (i.e. the mass ratio of debromination reagent to PBDEs), according to figure 1The schematic flow chart shown was used to conduct a control experiment. In this experiment, PBDEs were represented by commercial decabromodiphenyl ether.

[0031] The debrominated reagent Bi 2 o 3 Or CaO and decabromodiphenyl ether according to the same material ratio (2.125g debromination reagent: 0.875g decabromodiphenyl ether, a total of 3.0g, to ensure that the molar ratio of Bi:Br is 1:1) into the ball mill tank , and then add 7 balls (diameter 15mm, average weight 10.5g) into the ball mill jar. The inner diameter of a single ball milling jar is 40mm, the effective volume is 50mL, and the space between the ball milling jar and the lid is sealed with a polytetraf...

Embodiment 2

[0034] In order to show the change situation of PBDEs in the solid sample more specifically when ball milling reaction, adopt and utilize Bi in embodiment 1 2 o 3 The same sample (0h mixing, 0.5h ball milling and 1h ball milling) used as an additive to mechanochemically degrade decabromodiphenyl ether was analyzed by Fourier transform infrared spectroscopy (FTIR). image 3 shown.

[0035] For Bi 2 o 3 Compared with the 0h mixture of decabromodiphenyl ether without ball milling, the sample has three obvious absorptions in the FTIR spectrum: at 1350cm -1 There is a strong absorption peak on the left and right, which comes from the stretching vibration of the aromatic ether bond C-O-C in decabromodiphenyl ether; the other is at 960cm -1 The left and right absorption peaks come from the stretching vibration of the substituted benzene ring in the decabromodiphenyl ether molecule; while at 500-700cm -1 The left and right absorption bands are derived from the stretching vibratio...

Embodiment 3

[0037] In order to identify the change of the reactant and the generation of the final product in the ball milling process, similar to Example 2, using Bi 2 o 3 The same sample (0h mixing, 0.5h ball milling and 1h ball milling) used as an additive to mechanochemically degrade decabromodiphenyl ether was analyzed by X-ray diffraction (XRD). The obtained results are as follows Figure 4 shown.

[0038] After searching the XRD pattern card library, it can be seen that for Bi 2 o 3 Compared with the 0h mixture of decabromodiphenyl ether without ball milling, its XRD diffraction peak mainly comes from Bi 2 o 3 (Such as Figure 4 shown in ●), decabromodiphenyl ether also has some irregular small diffraction peaks around 20-25° (such as Figure 4 Indicated by ○ in). After 30min of ball milling, the diffraction peaks from decabromodiphenyl ether almost disappeared, Bi 2 o 3 The intensity of the diffraction peaks also decreased significantly, and at the same time, a diffractio...

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Abstract

The invention belongs to the technical field of environmental pollution waste treatment and novel material preparation and particularly relates to a method for preparing a photocatalyst with visible light response by mechanochemical treatment on polybrominated diphenyl ether solid waste. The method comprises the following steps: mixing polybrominated diphenyl ether solid waste with a debromination reagent under conditions of normal temperature and normal pressure, putting the mixture in a planetary high-energy ball mill reactor so that efficient degradation and debromination of polybrominated diphenyl ether can be realized through a mechanochemical reaction and the bromine element can be recycled at the same time, thus preparing the novel photocatalyst with visible light response. The method provided by the invention has the following advantages that the technological process is simple, the reaction conditions are mild (normal temperature and normal pressure), the target pollutants are completely decomposed, the finally generated product is a bromine-containing catalyst with visible light response; no excessive ball milling reagent is added and no secondary pollution is caused in the process, thereby meeting the conception of environmentally-friendly chemistry.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution waste treatment and novel material preparation, and particularly relates to a method for mechanochemically treating polybrominated diphenyl ether solid waste to prepare a photocatalyst with visible light response. Background technique [0002] Polybrominated diphenyl ethers (PolyBrominatedDiphenylEthers, PBDEs), also known as polybrominated diphenyl ethers, are a widely used brominated flame retardant. PBDEs have 209 homologues from monobromine to decabromine, and their commercial products are a group of diphenyl ether mixtures containing different numbers of bromine atoms, so they are collectively called polybrominated diphenyl ethers. Due to its high flame retardant efficiency, good stability, and low cost, PBDEs, as one of the most commonly used additive brominated flame retardants, are added to many polymers to improve the flame retardant properties of materials and reduce the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06A62D3/34A62D101/28
Inventor 黄俊张昆仑王海珠余刚邓述波王斌
Owner 苏州清初环境科技有限公司
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