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

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...

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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 achieve selective dehalogenation by controlling the reduction potential and the hydrogen evolution potential of the solution. It is currently a recognized and convenient electrocatalytic reduction method. For example, Pd-Fe nanoparticle modified electrode materials can show excellent Debromination performance (Journal of Hazardous Materials, 2018, 343(376-385)), however, this type of electrode requires substrate material pretreatment such as polishing, degreasing, pickling, etc., the process is cumbersome and involves the precious metal Pd

The use of three-dimensional biomembrane electrode reactor is a new type of bioelectrochemical water treatment technology. This technology has good water treatment effect, but it cannot be applied to practical projects on a large scale due to its low electron transfer efficiency and high energy consumption on the membrane electrode. (Environmental Research, 2021, 197 (111089))

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