Xuan Du
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Xuan Du has a total of 8 co-authors. Here are the top co-authors by number of shared publications:
- He Zhang
Heilongjiang University of Science and Technology
1 shared publication - Hongxiang Xu
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
1 shared publication - Jiushuai Deng
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
1 shared publication - Kejia Ning
National Geological Library of China (Geoscience Documentation Center), China Geological Survey, Beijing 100083, China
1 shared publication - Leilei Gao
Datang Tongzhou Technology Co., Ltd., Beijing 100040, China
1 shared publication - Qiming Zhuo
China University of Mining & Technology (Beijing)
1 shared publication
Latest Publications
- Open Access
- 12 June 2026
- Published by MDPI AG in Separations
- Vol. 13 (6) , 174
Hydrophobically Modified Anionic Polyacrylamide for Flocculation–Dewatering of Low-Rank Ultrafine Flotation Clean Coal
Low-rank ultrafine flotation clean coal typically yields filter cake moisture above 20% due to abundant oxygen-containing functional groups and strong surface hydrophilicity. Conventional polyacrylamide (PAM) flocculants are hydrophilic and improve dewatering only by altering cake porosity, not by reducing particle surface hydrophilicity, so they remove little adsorbed water. In this study, hydrophobically modified anionic polyacrylamides (HMAPAM) were synthesized by grafting lauryl acrylate onto APAM. FTIR, 1H NMR, XPS, and SEM confirmed the grafting and progressive enrichment of hydrophobic alkyl chains on the surface. Moderate hydrophobic modification markedly improved solid–liquid separation. HMAPAM-D (APAM/LA = 4.5:0.5) achieved a settling velocity of 0.817 cm/s at 9 mg/L, 50.2% higher than APAM, and reduced filter cake moisture to 16.64% at 1 mg/L under 0.6 MPa versus 19.39% for unmodified APAM. Excessive modification (HMAPAM-E, 4:1) promoted intramolecular self-association, producing heterogeneous flocs and higher filtration resistance that degraded dewatering efficiency. The performance gain stems from hydrophobic association combined with adsorption bridging. These results clarify how hydrophobic group content controls flocculation and dewatering, informing the design of better flocculants for this type of coal slurry.
- 12 June 2026
- Published by MDPI AG in Separations
- Vol. 13 (6) , 174
Open AccessHydrophobically Modified Anionic Polyacrylamide for Flocculation–Dewatering of Low-Rank Ultrafine Flotation Clean Coal
Low-rank ultrafine flotation clean coal typically yields filter cake moisture above 20% due to abundant oxygen-containing functional groups and strong surface hydrophilicity. Conventional polyacrylamide (PAM) flocculants are hydrophilic and improve dewatering only by altering cake porosity, not by reducing particle surface hydrophilicity, so they remove little adsorbed water. In this study, hydrophobically modified anionic polyacrylamides (HMAPAM) were synthesized by grafting lauryl acrylate onto APAM. FTIR, 1H NMR, XPS, and SEM confirmed the grafting and progressive enrichment of hydrophobic alkyl chains on the surface. Moderate hydrophobic modification markedly improved solid–liquid separation. HMAPAM-D (APAM/LA = 4.5:0.5) achieved a settling velocity of 0.817 cm/s at 9 mg/L, 50.2% higher than APAM, and reduced filter cake moisture to 16.64% at 1 mg/L under 0.6 MPa versus 19.39% for unmodified APAM. Excessive modification (HMAPAM-E, 4:1) promoted intramolecular self-association, producing heterogeneous flocs and higher filtration resistance that degraded dewatering efficiency. The performance gain stems from hydrophobic association combined with adsorption bridging. These results clarify how hydrophobic group content controls flocculation and dewatering, informing the design of better flocculants for this type of coal slurry.