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<p>Conventional ceramic membrane supports remain expensive, which motivates the use of mineral wastes as alternative precursors. Spent bleaching earth (SBE) is a silica- and alumina-rich by-product of edible-oil refining, but its retained oil can destabilize ceramic bodies during firing. Here, SBE was regenerated by hot-water, acetone, and n-hexane extraction, and the regenerated material was incorporated into tubular Al₂O₃-based supports prepared by horizontal centrifugal casting. N-hexane gave the highest oil removal efficiency (94.7%) and produced the thermally most stable precursor, with residual oil below 2 wt%. Increasing SBE loading strengthened the silicate signature of the supports, shifted the phase assemblage toward a quartz-rich framework, increased water absorption (33.8 to 57.6%) and porosity (41.1 to 64.1%), and reduced water contact angle from 41.6° to 29.0°. At the same time, the structural response was non-monotonic: SBE35 yielded the narrowest surface pore-size distribution (~ 11.2&#xa0;μm mean), a mesoporous network with 45.2&#xa0;nm average pore diameter, and much better chemical stability than SBE55. These results show that regenerated SBE acts simultaneously as a ceramic precursor and a pore-generating phase. Moderate incorporation provides the most balanced architecture for support development, while permeation and mechanical evaluation remain important future steps.</p>

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Valorization of regenerated spent bleaching earth for porous alumina membrane supports

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月28日

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  • Aulia Rahma,
  • Muthia Elma,
  • Muhammad Roil Bilad,
  • Isna Syauqiah,
  • Rahmad Apridho Patria,
  • M. Ziqri,
  • Rhafiq Abdul Ghani,
  • Zahratun Nisa,
  • Evia Salma Zaurida,
  • Awali Sir Kautsar Harivram,
  • Nur Hakim,
  • Fandi Oktasendra

摘要

Conventional ceramic membrane supports remain expensive, which motivates the use of mineral wastes as alternative precursors. Spent bleaching earth (SBE) is a silica- and alumina-rich by-product of edible-oil refining, but its retained oil can destabilize ceramic bodies during firing. Here, SBE was regenerated by hot-water, acetone, and n-hexane extraction, and the regenerated material was incorporated into tubular Al₂O₃-based supports prepared by horizontal centrifugal casting. N-hexane gave the highest oil removal efficiency (94.7%) and produced the thermally most stable precursor, with residual oil below 2 wt%. Increasing SBE loading strengthened the silicate signature of the supports, shifted the phase assemblage toward a quartz-rich framework, increased water absorption (33.8 to 57.6%) and porosity (41.1 to 64.1%), and reduced water contact angle from 41.6° to 29.0°. At the same time, the structural response was non-monotonic: SBE35 yielded the narrowest surface pore-size distribution (~ 11.2 μm mean), a mesoporous network with 45.2 nm average pore diameter, and much better chemical stability than SBE55. These results show that regenerated SBE acts simultaneously as a ceramic precursor and a pore-generating phase. Moderate incorporation provides the most balanced architecture for support development, while permeation and mechanical evaluation remain important future steps.