The playground also set up a kite flying area, and set up the corresponding security measures, so that students will draw their kites to fly safely into the sky, some students struggle to run on the playground,

make every effort to let the kite fly higher; Some wait for a good wind to send their kites up into the clouds. Soon, the kites rose high, competing, wonderful, so that the students felt on the campus "busy while the east wind kite" of the spring interest.

As the sky grew dark, the students returned with kites and laughter. The kite festival not only provides a platform for students to show their talents and relax, but also a cultural experience,

through carefully completed paintings, patiently piecing together again and again, and watching kites fly into the sky. Through participating in the activities, the students not only enhance the emotional exchange between each other, but also feel the charm of traditional Chinese culture, and promote the inheritance and development of Chinese culture.

As part of the campus cultural life, the Kite Festival not only enrichis students' campus life, but also shows their love for the excellent traditional Chinese culture. In the future, the College of Engineering Science will continue to explore and innovate the form of kite festival,

design activities with more characteristics of The Times, and build the kite Festival into a bright business card of campus culture, attracting more teachers and students to participate in it.Hydroxylamine synthesis New path! Using air and water as raw materials

A research team led by Professor Zeng Jie and Professor Geng Zhigang at the University of Science and Technology of China (USTC) has developed a new and sustainable way to successfully synthesize hydroxylamine using air and water as raw materials.

Hydroxylamine is an important chemical intermediate, which is widely used in medicine, pesticide, textile, electronics and other fine chemical fields.

Xi Zhenfeng, an academician at the Chinese Academy of Sciences and a professor at Peking University, said: "The work successfully converted ambient air and water into high value-added hydroxylamine using a plasma-electrochemical cascade pathway, providing a new potential nitrogen source conversion pathway for the chemical industry."

Zeng Jie introduced that industrial hydroxylamine is usually made of ammonia as a raw material, hydrogen or sulfur dioxide as a reducing agent, and its production process will not only consume a lot of fossil resources, but also emit a lot of carbon dioxide, causing environmental pollution.

In addition, ammonia is used as a raw material to make hydroxylamine, and obtaining ammonia from nitrogen also requires a lot of energy. This is mainly because the current industrial synthesis of ammonia mostly uses the Haber process,

and its production needs to be carried out in a high temperature and pressure environment, which will lead to the annual production of 300 million tons of carbon emissions and consume about 2% of the world's energy.

As the saying goes, thunderstorms unleash crops. Zeng Jie explained that its scientific principle is that the local high-pressure environment generated by lightning will oxidize nitrogen in the air into nitrogen oxides, which will form nitrates when dissolved in rain, and nitrate can be absorbed by crops as nitrogen fertilizer, and eventually promote crop growth.

Inspired by this natural phenomenon, the researchers successfully converted air into nitrogen oxides at normal temperature and pressure with the help of plasma discharge technology and renewable electric energy as the driving force.

Plasma discharge will produce nitric oxide, nitrogen dioxide and nitrous oxide in the air, of which nitrogen dioxide is the main raw material for the preparation of nitric acid. In order to improve the production efficiency of nitric acid, a plasma parallel arc discharge device was developed.

With nitrogen dioxide, nitric acid can be further prepared.

The researchers found that alkaline liquids absorb nitrogen dioxide efficiently, but the target product hydroxylamine is not stable in alkaline solutions and easily breaks down. In addition, the metal salt of alkaline solution will also have a negative effect on the separation and purification of hydroxylamine.

Therefore, the researchers switched to pure water as the absorber of nitrogen dioxide, and designed a multistage gas cycle absorber device to obtain high-purity nitric acid solutions more efficiently.

"Through the structural design of the plasma discharge device and the gas absorption device, we have realized the continuous production of nitric acid solution with a concentration of 7.5 grams per liter using only air and water as raw materials." Zeng Jie said.

With nitric acid available, the researchers began experimenting with the selective synthesis of hydroxylamine using an electrocatalytic process.

From nitric acid to hydroxylamine, this is a reduction process. However, among the various forms of nitrogen, hydroxylamine is not the lowest state, but ammonia is the lowest state.

In other words, hydroxylamine is not the final reduction product, but an intermediate product, and ammonia is the final reduction product. This makes ammonia a competitive byproduct in the reduction of nitric acid to hydroxylamine.