Chapter 424 The role of potassium permanganate

"Professor Qin, the materials you want." The assistant said with a smile

"Thank you." Qin Luo nodded in thanks, took a bottle of concentrated sulfuric acid from the trolley, poured it into a beaker, put it in an ice-water bath, and stirred it slowly. After a while, Qin Luo picked up 100 grams of graphite powder and 1 gram of The solid sodium nitrate mixture was poured slowly.

"Student Qin, have you put too much graphite powder?" Seeing Qin Luo's movements, Li Min's forehead wrinkled slightly, and his face was a little dignified.

As the director of the laboratory, he is naturally not a vase. Li Min himself is a double professor of physical chemistry. He has prepared graphene by redox method more than once, and he knows the whole preparation process clearly.

But it was the first time he had seen Qin Luo's method of pouring down so much graphite powder at one time and adding only a tiny bit of a solid mixture of sodium nitrate.

Can the ratio of 100:1 cause a chemical reaction?

"Not much, I even think it's a little too small." Qin Luo smiled slightly, poured the remaining 100 grams of graphite powder into it, and then used a magnetic rod to continuously stir the beaker.

"..." Li Min was completely speechless looking at this incredible operation.

Sure enough, theory is theory and practice is practice, and even those who put forward theories may not be able to succeed.

Thinking of this, Li Min waved to his assistant again: "Go to the warehouse and grab some graphite powder."

"En." The assistant nodded and was about to turn around, but the next second, he froze in place.

I saw Qin Luo pick up potassium permanganate while stirring the beaker and pour it into the beaker!

At this moment, everyone including Li Min's eyes widened!

Before everyone could recover from the confusion, the beaker had already started to boil, and the bubbles started to bubble out. At this moment, everyone's heart also boiled.

They know that the most critical moment has come. If Qin Luo can keep the temperature of the reaction at 90-98° and maintain it, then he can prepare graphene!

However, how to maintain the temperature has become the first problem to be solved at present.

"What will he do?" Li Min narrowed his eyes, staring at Qin Luo, or at his hands.

He wanted to see what kind of materials Qin Luo would add.

It was too late, but it was fast. When the reaction had been going on for about 5 minutes, Qin Luo, who had been waiting for a long time, finally moved. He took down the H2O2 reducing oxidant from the shelf.

H2O2 reduces oxidants!

Li Min's eyes were full of scarlet, and his whole body was shaking violently. Qin Luo's choice once again exceeded his expectations!

Under the surprised eyes of everyone, Qin Luo picked up the H2O2 reducing oxidant and poured it into the beaker.

The beaker boiled again, and the thermometer on the side showed that the temperature of the reaction in the beaker was as high as 98 degrees at this moment!

This is the most reactive temperature!

One minute, two minutes, ten minutes, half an hour!

As soon as the reaction temperature dropped, Qin Luo picked up the tweezers, clamped the mouth of the beaker, and washed with dilute hydrochloric acid solution and deionized water with a volume ratio of 1:10 until no sulfuric acid was detected in the filtrate at all.

At this moment, at the bottom of the beaker, a layer of graphene is looming.

He succeeded!

He successfully prepared graphene through a redox reaction, and it seems to be of good quality!

Seeing this scene, Li Min couldn't restrain the astonishment in his heart,