Method for preparing biomass based carbon quantum dots

• Main Authors: CHEN SHI, XIA SHAOXU, LI MIN, CHENG CHAOGE, SHI YANNI, WU QILIN
• Format: Patent
• Language: English
• Published: 27.05.2015
• Subjects: ADHESIVES; CHEMISTRY; COMPOUNDS THEREOF; DYES; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NANOTECHNOLOGY; NATURAL RESINS; NON-METALLIC ELEMENTS; PAINTS; PERFORMING OPERATIONS; POLISHES; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention relates to a method for preparing biomass based carbon quantum dots. The method comprises the following steps: carbonizing or activating a biomass material so as to obtain a carbonized product of which the carbon content is greater than or equal to 80%, performing nano quantization on the carbonized product by using a thick acid mixing liquid so as to obtain water-soluble fluorescent carbon quantum dots, changing the reaction temperature so as to adjust the fluorescent color of the carbon quantum dots, and performing retaining separation by using a dialysis bag, thereby obtaining carbon quantum dots in a rectangular diamond cluster about 5nm. Compared with the prior art, the method is wide in raw material source based on natural biomass sources and green and environment-friendly. The chemical oxidation preparation process is simple, and preparation of small-size carbon quantum dots can be easily achieved. The carbon quantum dots are stable in fluorescent effect and good in water solubility, and can be used in fields such as biological imaging.