Cellulose-driven dipole-interaction enhancement engineering for improving surface crack resistance in polysilicon slurry filtration system

JF Yang and XY Hu and TS Zhang and JH Liu and HN Zhang and XY Liang and QQ Guan, JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, 13, 118193 (2025).

DOI: 10.1016/j.jece.2025.118193

Filtration is a pivotal industrial technology that enables the efficient separation and purification of multiphase systems while optimizing resource utilization, improving operational efficiency, and addressing environmental sustainability challenges. However, developing filtration systems that deliver high clarity and rapid filtration rates, while resisting surface cracks in multiphase unstable polysilicon slurry remains a significant challenge. In this work, a cellulose-modified diatomite-based dipole-interaction-enhanced (CE@D-IE) strategy, characterized by its straightforward yet highly effective, was proposed as a solution to the issue. The CE@D-IE filtration system prevented filter cake from surface cracking at 10-40 degrees C, attributed to diatomite's capillary resistance, celluloseenhanced dipole interactions, and chain entanglement. Atomic force microscopy (AFM) and molecular dynamics (MD) simulations further revealed stronger interaction within the filter cake formed by the CE@D-IE strategy, providing critical molecular-level evidence for its improved resistance to surface cracking. Furthermore, the CE@D-IE strategy achieved excellent filtrate clarity and demonstrated a 50 % improvement in filtration rate compared to the BF strategy, resulting in a comprehensive enhancement of polysilicon slurry filtration performance. This work provides a viable and practical solution to address filtration challenges in polysilicon slurry under complex and dynamic conditions, while also demonstrating significant potential to enhance filtration performance in other complex systems.

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