New pollution reduction and carbon reduction catalytic oxidation technology was successfully developed

Recently, Sun Chenglin, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Wei Huangxi, a researcher, have made new progress in the research of catalytic oxidation of wastewater, and developed a new catalytic oxidation technology for pollution reduction and carbon reduction. The results were published in ACS Applied Materials & Interfaces.

High-concentration organic wastewater has complex components, high concentration, high toxicity, and is difficult to treat by conventional biochemical methods, and its treatment cost is as high as 4,000 to 12,000 yuan / ton as a hazardous waste. Catalytic wet oxidation (CWAO) is clean, efficient, and low-cost, solving the environmental bottlenecks faced by enterprises. Among them, catalyst is the core of CWAO, and how to reveal the catalytic oxidation mechanism of CWAO through the structure-activity relationship between catalyst structure and performance, develop a highly stable and high-performance catalytic oxidation catalyst, and establish intelligent control of the catalytic process is the core scientific problem faced in this field of research.

In response to the above problems, Sun Chenglin’s team took “micro-nanostructure regulation of CWAO catalyst to achieve its specific function” as the main research direction, directly linked scientific discovery with industrial development, took “catalyst life-catalytic mechanism-engineering process control” as the main research line, centered on the international cutting-edge catalytic materials, and combined with the needs of domestic enterprises, developed new catalyst modification methods and engineering application equipment.

The team developed a confined wastewater catalytic oxidation catalyst: by constructing a nanospatial confined layer on the surface of catalyst particles, the utilization rate of reactive oxygen species on the catalyst surface was improved, thereby enhancing the catalytic oxidation reaction. The superstructure confined catalyst Ni(2.8)-NCNT/CB constructed by the team achieved nearly 100% removal effect within 8 minutes during the oxidative degradation of m-cresol pollutants, and its decontamination efficiency was greatly improved compared with the traditional single-atom catalyst Ni(2.8)-NCNT. Subsequently, combined with electron paramagnetic resonance spectroscopy and electrochemical testing, it was found that the confined space composed of the nanotube array structure on the catalyst surface played a crucial role in promoting the catalytic reaction. This study provides a new catalyst design idea for improving the efficiency of catalytic oxidative degradation of pollutants and reducing the dosage of oxidant.

Intelligent integrated water purification equipment. Photo courtesy of Dalian Chemical Properties

In addition, based on years of experience in CWAO technology, Sun Chenglin’s team used the above-mentioned new catalyst to solve the problem of large amounts of hazardous waste of iron sludge generated by traditional Fenton oxidation technology, and can prepare a high-quality composite carbon source. On March 18, 2022, under the leading organization of Zhongbing Energy Conservation and Environmental Protection Company, Sun Chenglin’s team and Huajin United Petrochemical formed a collaborative innovation body for production, education and research. The team worked with Zhongbing Energy Conservation and Environmental Protection Company to formulate a test plan and carry out a small-scale pilot study, and on September 30, 2022, the small-scale test study was completed. In April 2023, the team cooperated with Zhongbing Energy Conservation and Environmental Protection Company and Dalian Keduo Environment to complete the pilot test for anthraquinone method hydrogen peroxide production wastewater, which reduced the output of hazardous waste iron sludge by more than 95% and the operating cost by more than 45%, which has the conditions for industrial scale-up. (Source: Sun Danning, China Science News)

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