Vol 2 Chapter 424: The role of potassium permanganate

"Professor Qin, the materials you want." The assistant said with a smile
"Thank you." Qin Luo nodded and thanked him. He took a bottle of concentrated sulfuric acid from the trolley, poured it into the beaker, put it in an ice water bath, and stirred slowly. After a while, Qin Luo picked up 100 grams of graphite powder and 1 gram. The sodium nitrate solid mixture is slowly poured in.
"Student Qin, did you put too much graphite powder?" Seeing Qin Luo's movements, Li Min's forehead wrinkled slightly, his face a bit solemn.
As the director of the laboratory, he will naturally not be a vase. Li Min himself is a double professor of physics and chemistry. He has prepared graphene by redox more than once, and he knows the whole preparation process clearly.
However, it was the first time that Qin Luo saw the method of pouring so many graphite powders at one time and adding only a small amount of solid mixture of sodium nitrate.
Can a ratio of 100:1 cause a chemical reaction?
"Not much, I even think it's a little bit young." Qin Luo smiled slightly, poured the remaining 100 grams of graphite powder into it, and then used a magnetic rod to constantly stir the beaker.
"..." Li Min was completely speechless looking at this incredible operation method.
Sure enough, theory is theory and practice is practice. 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 just wanted to turn around, but the next second, he was stunned.
I saw Qin Luo picking up potassium permanganate while stirring the beaker and poured it into the beaker!
At this moment, everyone including Li Min's eyes widened!
Before everyone recovered from the dumbfoundedness, the beaker had already begun to boil, and the bubbles began to bubble out, and at this moment everyone's hearts were also boiling.
They know that the most critical moment has arrived. If Qin Luo can keep the temperature of the reaction at 90-98° and maintain it, then he can produce graphene!
However, how to maintain the temperature has become the first problem to be solved now.
"What would he do?" Li Min squinted his eyes and stared at Qin Luo, or at his hands.
He wanted to see what kind of materials Qin Luo would add.
It was too late, and it was fast. When the reaction progressed to about 5 minutes, Qin Luo, who had been waiting for a long time, finally moved. He removed the H2O2 reducing oxidant from the shelf.
H2O2 reduction oxidant!
Li Min's eyes were scarlet, and his body trembled violently. Qin Luo's choice once again exceeded his expectations!
In the eyes of everyone in surprise, Qin Luo picked up the H2O2 reducing oxidant and poured it into the beaker.
The beaker boils again, and the thermometer on the side shows that the reaction temperature in the beaker is as high as 98 degrees at this moment!
This is the temperature that reflects the most issues!
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 a 1:10 dilute hydrochloric acid solution and deionized water until no sulfuric acid in the filtrate was detected at all.
At this moment, at the bottom of the beaker, a layer of graphene is looming.
He succeeded!
He successfully prepared graphene through oxidation-reduction reaction, and the quality seems to be good!
Seeing this scene, Li Min could hardly contain the shock in his heart.