Boonkanon Chanita, Phatthanawiwat Kharittha, Chuenchom Laemthong, Lamthornkit Nareumon, Taweekarn Tarawee, Wongniramaikul Worawit, Choodum Aree
Integrated Science and Technology Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket 83120, Thailand.
Division of Physical Science and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla 90110, Thailand.
Polymers (Basel). 2021 Nov 17;13(22):3975. doi: 10.3390/polym13223975.
Monolithic cryogels from starch were successfully synthesized and applied as alternative biodegradable filters for the first time. Rice flour was cross-linked with Ca from limewater during gelatinization before being frozen and then thawed for three cycles. The resultant material was then soaked in ethanol for 3 h before incubation at 80 °C for 1 h, yielding monolithic material with interconnected pores in sizes of 51 ± 18 to 52 ± 15 µm without any need of freeze-drying. The cryogels possessed macroporous structure with specific surface areas from 1.1 to 4.3 mg, they could adsorb water from 599 ± 27 to 635 ± 59% of their dry weight with low swelling ratios of 6.0 ± 0.3 to 6.4 ± 0.6 g/g, and could be applied as biofilters to remove suspended particles and reduce the light absorption of water sample from 25 ± 3 to 96 ± 5%. The prepared biofilters can be re-used up to three times, although they cost only USD 0.0004/piece. Complete weight loss resulted from burial in soil for 30 days, indicating environmentally friendly biodegradation and potential for environmental applications.
首次成功合成了淀粉基整体式冷冻凝胶，并将其用作替代性可生物降解过滤器。在糊化过程中，米粉与石灰水中的钙交联，然后冷冻，再解冻三个循环。然后将所得材料在乙醇中浸泡3小时，然后在80°C下孵育1小时，得到具有相互连通的孔的整体式材料，孔径大小为51±18至52±15 µm，无需冷冻干燥。冷冻凝胶具有大孔结构，比表面积为1.1至4.3 mg，它们可以吸附占其干重599±27至635±59%的水，低溶胀率为6.0±0.3至6.4±0.6 g/g，并且可以用作生物过滤器以去除悬浮颗粒，并将水样的光吸收从25±3降低到96±5%。所制备的生物过滤器尽管每个成本仅为0.0004美元，但最多可重复使用三次。在土壤中掩埋30天后完全失重，表明其具有环境友好的生物降解性和环境应用潜力。
