Karchangi Zahra Kazemi, Nazarnezhad Noureddin, Labidi Jalel, Sharifi Seyed Hassan
Wood and Paper Science Department, Faculity of Natural Resources, Sari Agricultural Sciences and Natural Resource University, Sari 4818168984, Mazandaran, Iran.
Chemical and Environmental Engineering Department, University of the Basque Country UPV/EHU, Plaza Europa, 1, 20018 Donostia-San Sebastián, Spain.
Materials (Basel). 2024 Apr 24;17(9):1977. doi: 10.3390/ma17091977.
As air pollution escalates, the need for air filters increases. It is better that the filters used be based on natural fibers, such as non-wood fibers, which cause low damage to the environment. However, the short fiber lengths, low apparent densities, and high volumes of non-wood materials can make it challenging to prepare filter paper with the required mechanical and physical properties. In that context, this study focused on utilizing bamboo fibers to fabricate filter paper by employing the anthraquinone soda pulping method. The pulp underwent bleaching and oxidation processes, with the incorporation of cationic starch (CS) and polyvinyl alcohol (PVA) to enhance resistance properties, resulting in the creation of handmade filter papers. The findings revealed that the tear, burst, and tensile strength of filter paper increased with the oxidation and addition of CS and PVA. Air permeability increased with addition of PVA and combination of CS and PVA. FTIR demonstrated the conversion of hydroxyl groups in cellulose chains to carboxyl groups due to oxidation. SEM images illustrated alterations in the fiber structure post-oxidation treatment, with CS reducing pores while PVA and the CS-PVA combination enlarged pore size and enhanced porosity. The BET surface area surface area expanded with oxidation and the addition of the CS-PVA blend, indicating heightened filter paper porosity. Notably, the combined inclusion of CS and PVA not only augmented mechanical strength but also increased porosity while maintaining pore size.
随着空气污染的加剧，对空气过滤器的需求也在增加。最好使用基于天然纤维的过滤器，如非木纤维，这类纤维对环境的损害较小。然而，非木材料的纤维长度较短、表观密度较低且体积较大，这使得制备具有所需机械和物理性能的滤纸具有挑战性。在此背景下，本研究聚焦于采用蒽醌烧碱法制浆利用竹纤维制造滤纸。纸浆经过漂白和氧化过程，并加入阳离子淀粉（CS）和聚乙烯醇（PVA）以增强抗性，从而制成手工滤纸。研究结果表明，滤纸的撕裂强度、破裂强度和拉伸强度随着氧化以及CS和PVA的添加而增加。透气率随着PVA的添加以及CS和PVA的组合而增加。傅里叶变换红外光谱（FTIR）表明，由于氧化作用，纤维素链中的羟基转化为羧基。扫描电子显微镜（SEM）图像显示了氧化处理后纤维结构的变化，CS减少了孔隙，而PVA以及CS-PVA组合增大了孔径并提高了孔隙率。比表面积随着氧化以及CS-PVA混合物的添加而增大，表明滤纸孔隙率提高。值得注意的是，CS和PVA的联合加入不仅提高了机械强度，还在保持孔径的同时增加了孔隙率。
