Recently, Professor Kong Lingtao's research group from the Hefei Institute of Physics, Chinese Academy of Sciences has prepared a hollow amorphous Co/C composite material for activating hydrogen peroxide (H2O2) to generate singlet oxygen and realizing the selection of oxytetracycline (OTC) in complex water matrices. Sexual elimination.The results were published in the journal Chemical Engineering.googletag.cmd.push(function() { googletag.display('div-gpt-ad-1449240174198-2'); });
OTC is the most common tetracycline antibiotic in animal husbandry.It can be detected in areas with strong biological stability, such as water and soil, that cannot be effectively removed by conventional technical means.
As a simple and efficient advanced oxidation technology, Fenton-like oxidation is considered as an effective method for water pollution control.As an electrophilic non-radical, singlet oxygen exhibits excellent anti-interference ability to background substrates, which is helpful for the selective removal of organic pollutants containing electron-rich groups.However, in most Fenton-like reactions, the yield of singlet oxygen is low and the contribution is small.
In this study, the researchers designed and fabricated a hollow amorphous Co/C composite with a large number of oxygen-containing functional groups such as carbonyl and hydroxyl groups distributed on the surface.
They obtained the Co/C-3 material by optimizing the ratio of cobalt and carbon, and achieved the best degradation of 20 ppm OTC by activating H2O2 at neutral pH.The catalytic degradation system exhibits excellent repeatability, stability and anti-interference ability.The results of quenching experiments and electron paramagnetic resonance confirmed that the converted singlet oxygen was the main oxidizing species, and no hydroxyl radical appeared in the system.
The synergy between cobalt and oxygen-containing functional groups within the material plays a key role in activating hydrogen peroxide in the formation of singlet oxygen.In addition, the possible degradation pathways and potential ecotoxicity of OTC and its intermediates were also revealed.
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