Ma Mengyu, Zhao Mengxi
School of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, China.
ACS Omega. 2023 Sep 14;8(38):34678-34686. doi: 10.1021/acsomega.3c03597. eCollection 2023 Sep 26.
Although the addition of fine particles can enhance mass transfer, the stability of suspension is still a challenge. Responding to this, this study introduced carbon quantum dots (CQDs) with good hydrophilicity into a desulfurizer. N-doped carbon quantum dots (N-CQDs) were prepared by the hydrothermal method and characterized by TEM, FT-IR, and XPS. The stability and rheological properties of MDEA-based CQD solutions with different concentrations were studied. CQD solutions with low concentrations showed good stability, and the viscosity of CQD solutions was positively correlated with concentration and inversely correlated with temperature. The desulfurization experiment showed that the desulfurization effect and mass transfer enhancement of MDEA-based CQD solutions were coinfluenced by the viscosity and concentration of the solution; 0.01 vol % CQD solution had the best desulfurization effect, and the mass transfer coefficient was 0.66 mol/(mh kPa), which increased by 26.61% compared to the base solution.
尽管添加细颗粒可以增强传质，但悬浮液的稳定性仍然是一个挑战。针对这一问题，本研究将具有良好亲水性的碳量子点（CQDs）引入脱硫剂中。通过水热法制备了氮掺杂碳量子点（N-CQDs），并通过透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）对其进行了表征。研究了不同浓度的基于甲基二乙醇胺（MDEA）的CQD溶液的稳定性和流变性能。低浓度的CQD溶液表现出良好的稳定性，CQD溶液的粘度与浓度呈正相关，与温度呈负相关。脱硫实验表明，基于MDEA的CQD溶液的脱硫效果和传质增强受到溶液粘度和浓度的共同影响；0.01体积%的CQD溶液具有最佳的脱硫效果，传质系数为0.66 mol/(mh kPa)，与基础溶液相比提高了26.61%。
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