Perez-Botella Eduardo, Murillo-Acevedo Yesid S, Bastos de Freitas Bárbara, Lauersen Kyle J, Grande Carlos A
Intensification of Materials and Processes Laboratory, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Bioengineering Program, Biological and Environmental Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
ACS Omega. 2025 Apr 23;10(17):17735-17743. doi: 10.1021/acsomega.5c00173. eCollection 2025 May 6.
Spray-dried biomass from genetically engineered can be used as a binder to extrude alumina adsorbents. The proposed process involves heating at a moderate temperature (180 °C), replacing inorganic binders that require high sintering temperatures. The transformed genes present in the algal biomass were no longer detectable after the thermal treatment. Binder contents above 15% led to successful extrusion. Extrudability was found to correlate with the viscoelasticity coefficient, tan(δ), obtained from independent rheometric measurements. The extrudates have crush strengths of >27 N, complying with industrial requirements. The water vapor adsorption capacity in shaped alumina adsorbents was 7.5 mol/kg, indicating a 30% reduction compared with alumina powder. The mechanical and adsorption properties of the formed adsorbents remain unaltered after a 1 week immersion in water, ethanol, or -heptane and after 10 gas-phase adsorption/desorption cycles. The results demonstrate that waste biomass from algal processes can be effectively used to produce functional industrial adsorbents.
基因工程喷雾干燥生物质可作为粘结剂用于挤出氧化铝吸附剂。所提出的工艺包括在适中温度（180℃）下加热，替代需要高烧结温度的无机粘结剂。热处理后，藻类生物质中存在的转化基因不再可检测到。粘结剂含量高于15%可实现成功挤出。发现挤出性与通过独立流变测量获得的粘弹性系数tan(δ)相关。挤出物的抗压强度>27 N，符合工业要求。成型氧化铝吸附剂的水蒸气吸附容量为7.5 mol/kg，表明与氧化铝粉末相比降低了30%。成型吸附剂在水中、乙醇或庚烷中浸泡1周以及经过10次气相吸附/解吸循环后，其机械性能和吸附性能保持不变。结果表明，藻类工艺产生的废弃生物质可有效用于生产功能性工业吸附剂。
