Electrochemical deep degradation method of brominated phenolic compound under synergistic adsorption of surfactant

A technology of phenolic compounds and surfactants, applied in the field of brominated flame retardant treatment, can solve the problems of low electron transfer efficiency, incompatible with deep degradation, easy agglomeration of zero-valent iron, etc., and achieves low price, short reaction time, The effect of a wide range of concentrations

Active Publication Date: 2022-01-11
ZHEJIANG UNIV OF TECH
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  • Abstract
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Problems solved by technology

Zero-valent iron and its bimetallic system doped with other metals are often used as reducing agents for the debromination of TBBPA, but highly toxic reagents such as sodium borohydride or lithium aluminum hydride are often required when synthesizing zero-valent iron (Industrial&Engineering Chemistry Research, 2012,51(25):8378-8385.), or doped with noble metal catalysts to improve its catalytic activity (Environment International,2020,135:105353.), the reduction system often needs to be performed in a weak acid or near-neutral system It has a better degradation effect, and the synthesized zero-valent iron has the problem of easy agglomeration
At the same time, in the above methods, organic solvents are often used to dissolve TBBPA and then degrade, which does not conform to the actual situation, and the deep degradation of TBBPA often exists in water pollutants.
[0004] Electrocatalytic reduction dehalogenation can

Method used

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  • Electrochemical deep degradation method of brominated phenolic compound under synergistic adsorption of surfactant
  • Electrochemical deep degradation method of brominated phenolic compound under synergistic adsorption of surfactant
  • Electrochemical deep degradation method of brominated phenolic compound under synergistic adsorption of surfactant

Examples

Experimental program
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Effect test

Embodiment 0

[0031] In order to study the effect of cationic surfactant CTAB on the TBBPA electrode process, a cyclic voltammetry test was carried out, and the test results are as follows figure 1 shown. The cyclic voltammetry test was carried out in a standard three-electrode system, with a silver disc electrode As the working electrode, the platinum sheet (20×20×0.2mm) is used as the counter electrode, and the standard mercury oxide electrode (Hg / HgO) is used as the reference electrode. The scan rate is 50mV / s, and the test temperature is 25°C. There is no redox peak in 0.4mol / L NaOH solution. When 1mmol / L CTAB was added to the blank NaOH solution, the hydrogen evolution potential of the system shifted negatively, indicating that CTAB was adsorbed on the electrode surface to form a hydrophobic film, which blocked the accumulation of solvent molecules on the electrode surface, thereby broadening the electrochemical window. When 10mmol / L TBBPA is added to 0.4mol / L NaOH solution, the hyd...

Embodiment 1-5

[0032] Embodiment 1-5: a kind of electrochemical deep degradation method of TBBPA in water, comprises the steps:

[0033] Step 1: Select a jacketed single-chamber electrolyzer that can accommodate 30mL of liquid, weigh CTAB (0.0054g, 1mmol / L,) and TBBPA (0.0815g, 10mmol / L) and dissolve in 15mL of NaOH (0.12g , 0.2mol / L) aqueous solution, the resulting electrolyte is added to the electrolytic cell, a suitable cathode material and anode material are selected, and a DC stabilized voltage power supply is connected to the electrodes.

[0034] Step 2: Connect the constant temperature circulating water instrument and set it to 25°C, add a 6mm×10mm size stirrer, set the magnetic stirring to 600rpm, start the DC stabilized power supply and control the current density to 4mA / cm 2 , Measure a certain amount of reaction solution at the reaction time of 0h, 1h, 2h, 3h, 4h, and 5h and pass it through a 0.22μm microporous membrane, and the obtained supernatant is subjected to the following t...

Embodiment 6-10

[0037] Embodiment 6-10: a kind of electrochemical deep degradation method of TBBPA in water, comprises the steps:

[0038] What is different from Examples 1-5 is: the cathode material is 20 × 20 × 0.2mm galvanized iron sheet in step one, and the NaOH concentration is respectively 0.1mol / L (embodiment 6) and 0.2mol / L (embodiment 7) in step one ), 0.3mol / L (embodiment 8), 0.4mol / L (embodiment 9), 0.5mol / L (embodiment 10), all the other electrolysis conditions are constant, and the obtained results are as follows image 3 shown. image 3 It shows that the concentration of NaOH between 0.2mol / L and 0.4mol / L has almost no effect on the degradation rate of TBBPA, and the degradation rate of TBBPA at 10mmol / L can reach 99% after 5 hours. The concentration of NaOH has a certain influence on the deep degradation of TBBPA to the product BPA. In the case of 0.4mol / L NaOH, 92% of 10mmol / L TBBPA is degraded to BPA. When the NaOH concentration increased to 0.5mol / L, the degradation rate o...

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Abstract

The invention discloses an electrochemical deep degradation method of a brominated phenolic compound under synergistic adsorption of a surfactant. The method sequentially comprises the following steps: (1) preparing an electrolyte and adding the electrolyte into an electrolytic bath, wherein the solute of the electrolyte is a brominated phenol compound, a cationic surfactant and a supporting electrolyte, the solvent is water, and the cationic surfacetant is selected from at least one of dodecyl trimethyl ammonium bromide, cetyl trimethyl ammonium bromide, octadecyl trimethyl ammonium bromide and cetyl pyridinium bromide; and (2) putting a cathode material and an anode material into an electrolytic bath, and connecting a voltage-stabilized direct-current power supply for electrolysis so as to deeply degrade the brominated phenol compound. The charge transfer process of the electrode reaction is promoted by utilizing the synergistic adsorption effect of the surfactant and the brominated phenol compound on the surface of the electrode, so that the rapid and deep debromination degradation of the brominated phenol compound is realized.

Description

(1) Technical field [0001] The invention belongs to the technical field of brominated flame retardant treatment applied to environmental protection, and in particular relates to an electrochemical deep degradation method of brominated phenolic compounds. (2) Background technology [0002] At present, brominated flame retardants are the organic flame retardants with the largest output in my country and the world, mainly including tetrabromobisphenol A (TBBPA), polybrominated diphenyl ethers (PBDEs), polybrominated biphenyls (PBBs), 2,4,6-tribromo New brominated flame retardants such as phenol (TBP), among which TBBPA is widely used in electronic and electrical equipment because of its high flame retardant efficiency and strong heat resistance. According to statistics, the global annual output of TBBPA is as high as 120,000 tons, accounting for 60% of the global brominated flame retardant market. These lipophilic additive organic flame retardants are easy to enter the environm...

Claims

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Application Information

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IPC IPC(8): C25B3/11C25B15/025C25B15/02
CPCC25B3/11C25B15/025C25B15/02
Inventor 朱英红焦玉峰葛展榜郭冠璇张建平陈赵扬
Owner ZHEJIANG UNIV OF TECH
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