文献类型：期刊文献

英文题名：CO2 bubble-mediated phase interfacial regulation enhances flotation recovery of carbon from low-rank coal

作者：Cheng, Gan[1,2];Gao, Penghao[1];Guo, Ruiwen[1];Duan, Peigao[2];Liu, Bo[3];Guo, Yanxia[1];Cheng, Fangqin[1]

机构：[1]Shanxi Univ, Inst Resources & Environm Engn, Natl Engn Res Ctr Solid Waste Resource Recovery, Shanxi Lab Yellow River, 92 Wucheng Rd, Taiyuan, Shanxi, Peoples R China;[2]Xi An Jiao Tong Univ, Sch Chem Engn & Technol, 28 Xianning West Rd, Xian, Shaanxi, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai, Peoples R China

年份：2026

卷号：545

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20263121210072);Scopus(收录号：2-s2.0-105046077510);WOS:【SCI-EXPANDED(收录号:WOS:001838146800001)】；

基金：This research was supported by the "National Key Research and Development Program of China" (grant no. 2024YFC3909300); "National Nature Science Foundation of China" (grant no. 22478231); "Fundamental Research Program of Shanxi Province" (grant no. 202403021221011).

语种：英文

外文关键词：Flotation; Long-flame coal; Carbon dioxide bubble; Hydrophobic regulation; Molecular simulation

摘要：Carbon underpins global energy and industry, and its efficient reuse is pivotal for advancing a circular economy and reducing environmental burden. A CO2-mediated flotation strategy based on coupled bubble dynamics and surface chemistry reconstruction was developed for efficient carbon recovery from low-rank coal and carbonaceous solid wastes. Compared with conventional flotation, CO2-mediated flotation generated finer and more stable microbubbles, enhancing bubble dispersion, collision probability, and bubble-particle attachment stability. Interfacial characterization demonstrated that CO2 treatment suppressed hydrophilic oxygen-containing functionalities, reduced surface polarity, and increased the contact angle of long-flame coal (LFC) from 21.88 degrees to 49.30 degrees, thereby improving hydrophobicity. Under optimized conditions, combustible recovery reached 88.49%. Density functional theory calculations demonstrated preferential CO2 adsorption onto oxygencontaining sites, promoting hydrophobic surface reconstruction and stable three-phase contact formation. Lifecycle assessment confirmed reduced environmental impacts. This work provides a sustainable strategy for low-impact carbon resource recovery.