Biologically-based one-pot process for the development of banana microfibre sheet

P.D. Emrith-Jankee , H. Ramasawmy , D. Surroop , D.B. Das
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Abstract

Lignocellulosic rectangular sheets (200 mm wide, 300 mm long and 1 mm thick), made from banana microfibres, were treated using an in-house resource-efficient one-pot system, which involves the one-of-a-kind dual and sequential processes of green bleaching and acid treatment. The purpose of this treatment was to make the lignocellulosic sheets suitable as water filtration membranes. To promote a cleaner production of the lignocellulosic sheets with no chemicals, both processes were conducted biologically using a common fungus, Aspergillus niger. This is another singularity of the study, as these processes are not known to have been run sequentially and from the same microorganism. The techno-economic analysis done showed that the proposed one-pot system is sustainable. Moreover, the results in this study confirmed that the biological process occurred, through the detection of the enzyme produced. A chemical composition analysis validated that amorphous constituents (lignin, pectin and hemicellulose) were removed to a high extent (40 – 50 %), thereby causing an enhanced cellulose content of 66 – 77 % (an increase of 30 %). Furthermore, the developed one-pot process allowed a reproducible decrease in pore size (58 %), giving the microfibre sheet a higher salt rejection capacity. Additionally, the banana microfibre sheets exhibited a high porosity of 98 % and a high water flux (460 – 1350 L/h m2 bar), comparable to commercial membranes (around 1000 L/h m2 bar). Furthermore, despite the expectation that the one-pot process would only maintain the mechanical strength, it caused an increase of 95 % in the wet tensile strength of the banana microfibre sheets while causing a maximum boost of 21 % in the dry tensile strength. Thus, the identified optimum conditions were acidic bleaching (pH: 3 – 5) and acid treatment of 8 days. In summary, following the one-pot process, the banana microfibre sheets were observed to be suitable for use as water filtration membranes due to their enhanced characteristics of the microfibre sheets. The one-pot system has resulted in an effective, cost-effective and eco-friendly process for successfully bleaching and acid-treating microfibre sheets.
香蕉微纤维片的生物一锅法制备
由香蕉微纤维制成的木质纤维素矩形薄片(宽200 毫米,长300 毫米,厚1 毫米),使用内部资源高效的一锅系统进行处理,该系统包括绿色漂白和酸处理的独一无二的双重和顺序过程。该处理的目的是使木质纤维素片适合作为水过滤膜。为了促进无化学物质的木质纤维素片的清洁生产,这两个过程都是用一种常见的真菌黑曲霉进行的。这是该研究的另一个奇异之处,因为这些过程并不是由同一种微生物连续进行的。所做的技术经济分析表明,所提出的一锅制是可持续的。此外,本研究的结果证实了生物过程的发生,通过检测产生的酶。化学成分分析证实,无定形成分(木质素、果胶和半纤维素)被高度去除(40 - 50 %),从而使纤维素含量提高了66 - 77 %(增加30 %)。此外,开发的一锅工艺允许孔径可重复减小(58% %),使微纤维片具有更高的防盐能力。此外,香蕉微纤维片具有98% %的高孔隙率和高水通量(460 - 1350 L/h m2 bar),与商业膜(约1000 L/h m2 bar)相当。此外,尽管预期一锅工艺只会保持机械强度,但它导致香蕉微纤维片的湿拉伸强度增加了95 %,而干拉伸强度最大提高了21 %。因此,确定的最佳条件为酸性漂白(pH: 3 ~ 5)和酸处理8天。综上所述,经过一锅工艺,观察到香蕉微纤维片由于其增强的特性而适合用作水过滤膜。一锅系统已经产生了一个有效的,具有成本效益和环保的过程,成功漂白和酸处理微纤维片。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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