Preparation and characterization of carbon nanomaterials prepared by thermal treatment of biomass DNA

生物质DNA热处理制备碳纳米材料的制备及表征

基本信息

批准号：
21K12306
负责人：
ジンチェンコアナトーリ
金额：
$ 2.66万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21K12306/
关键词：
DNA biomass carbon nanomaterials fluorescent nanomaterial biodots pyrolysis microwave processing metal ion sensing mercury ion sensing ナノ材料水熱合成マイクロ波処理熱分解

项目摘要

The hydrothermal synthesis of DNA carbon nanomaterials (carbon dots) using a conventional hydrothermal reactor and the microwave reactor under the same conditions were conducted to compare the fluorescent properties of products. It was found that while the emission wavelengths were similar for both types of reaction products, the carbon dots prepared in the microwave reactor had 1.5-2-fold higher fluorescence compared to those obtained in the conventional HT heating reaction.Next, biochars and hydrocars were prepared from DNA or DNA-derived materials by the pyrolytic treatment at 300-500 degrees and hydrolytic treatment at 200 degrees. The obtained chars were studied for their adsorption capacities towards typical environmental pollutants (heavy metal ions and pharmaceuticals) by standard batch adsorption experiments. DNA-derived biochars and hydrochars showed low adsorption capacities (ca. 1 mg/g and below) towards all studied adsorbents compared to the original DNA and DNA containing materials and standard adsorbents such as activated carbon. The decrease in the adsorption capacity during thermal treatment of DNA materials was ascribed to the decomposition of nitrogen-containing and other functional groups that served as active centers for binding with the adsorbing molecules. The application of DNA-derived chars as adsorbents was thus shown to be limited. Furthermore, it was concluded that the presence of the phosphate moieties in the DNA prevented the formation of the graphitic carbon structures suggested in the beginning of the study.

采用常规水热反应器和微波反应器在相同条件下水热合成DNA碳纳米材料（碳点），比较产物的荧光性能。研究发现，虽然两种类型的反应产物的发射波长相似，但微波反应器中制备的碳点的荧光比传统 HT 加热反应中获得的碳点高 1.5-2 倍。由DNA或DNA衍生材料经300-500度热解处理和200度水解处理而制得。通过标准批量吸附实验研究了所获得的炭对典型环境污染物（重金属离子和药物）的吸附能力。与原始 DNA 和含 DNA 材料以及标准吸附剂（例如活性炭）相比，DNA 衍生的生物炭和水炭对所有研究的吸附剂均显示出较低的吸附能力（约 1 mg/g 及以下）。 DNA材料热处理过程中吸附能力的下降归因于作为与吸附分子结合的活性中心的含氮和其他官能团的分解。因此，DNA 衍生炭作为吸附剂的应用受到限制。此外，得出的结论是，DNA 中磷酸盐部分的存在阻止了研究开始时提出的石墨碳结构的形成。