Investigation into the Enhancement of Gas-Liquid Mass Transfer of Absorption of H2S by MDEA with Carbon Quantum Dots

Mengyu Ma; Mengxi Zhao

doi:10.1021/acsomega.3c03597

Investigation into the Enhancement of Gas-Liquid Mass Transfer of Absorption of H₂S by MDEA with Carbon Quantum Dots

ACS Omega. 2023 Sep 14;8(38):34678-34686. doi: 10.1021/acsomega.3c03597. eCollection 2023 Sep 26.

Authors

Mengyu Ma¹, Mengxi Zhao¹

Affiliation

¹ School of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, China.

Abstract

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/(m³h kPa), which increased by 26.61% compared to the base solution.