The persulfate advanced oxidation technology has the advantages of strong oxidizing ability, wide application range of water quality, convenient storage and transportation of chemicals, and has become a hot topic in the field of water pollution control. The construction of high-efficiency heterogeneous catalytic system is the main research direction of persulfate oxidation technology, and its core lies in the design of high-performance heterogeneous catalyst. Around this core, domestic and foreign scholars have carried out a lot of fruitful work, and obtained a series of high-efficiency metal-based catalysts represented by cobalt. However, in the course of use, these catalysts will inevitably overflow metal ions, causing secondary pollution of water bodies, posing a threat to the aquatic environment, drinking water safety and human health. Therefore, the development of safe, efficient and economical non-metallic carbon-based catalysts is a key link in the construction of a green persulfate oxidation system.
Compared with nano-carbon materials such as graphene, fullerene and carbon nanotubes, nano-diamond has the advantages of high initial activity, low production cost and low physiological toxicity. It has more engineering application prospects in actual water treatment, causing researchers. Wide attention. Related researches have focused on enhancing the macroscopic catalytic performance of nanodiamonds, but the microscopic mechanism of performance enhancement is still unclear, and the specific catalytic activity sites are still unclear.
In response to the above problems, the researchers skillfully utilized the thermal stability difference of oxygen-containing functional groups, and proposed a strategy for the directional carbonylation of oxygen-containing functional groups on the surface of nanodiamonds and the quantitative regulation of carbonyl groups, while ensuring that other physicochemical structures of nanodiamonds were basically unchanged. A simple, controllable preparation of carbonylated nanodiamonds is achieved. Based on qualitative and quantitative structure-activity analysis, it was found that the rate constant of nano-diamond catalyzed decomposition of persulfate and oxidative degradation of p-chlorophenol was linearly positively correlated with its surface carbonyl content (R2?0.96). These results indicate that the carbonyl group on the surface of the nanodiamond is a catalytically active site. Experimental results such as free radical quenching, electron spin trapping and molecular probes indicate that the active material produced by nano-diamond catalyzed persulfate is selective singlet oxygen. Under the actual water quality conditions, the catalytic degradation of p-chlorophenol by carbonylated nanodiamonds is as high as 87%, which is 8.7 times and 21.8 times that of the conventional cobalt ion and iron ion homogeneous catalytic system, respectively, showing an attractive application prospect.
The above research results have been published in the internationally renowned journal "Advanced Functional Materials" recently, and the readers will be introduced in the form of the front cover (Front Cover). The first author of the article is Dr. Shao Penghui from Nanchang Aviation University. The authors are Professor Luo Xuwei from Nanchang Aviation University and Professor Tian Jiayu from Hebei University of Technology. In addition, the above work has also received support and cooperation from Curtin University of Australia and Sham Shui Poan Water Group. (Source: Science Network)
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