The development of eco-friendly adsorbent with perfect solid/liquid separation performance is of great practical importance for the efficient purification of dye-containing wastewater. Herein, cellulose based cation-exchange fibrous bio-adsorbent (CEF) was successfully obtained via an industrialized cellulose etherification process. The fiber morphology can be maintained with the average degree of substitution (DS) of CEF as about 0.19. The CEF showed high efficiency adsorption for methylene blue (MB): achieving 82% of equilibrium uptake (447.69 mg·g⁻¹) within 5 min. Especially, the non-woven porous filter material, formed by CEFs and glass fibers, showed the praisable solid/liquid separation characteristics, fast water filtration rate (≈ 6.3 m³·m⁻²·h⁻¹) and high removal rate (≈ 99.2%) when it was used to adsorb MB (150 ppm) from wastewater. In addition, CEF filter material can be regenerated via a simple method. This study demonstrates that green natural fiber materials are promising for the economical and efficient purification of dye-containing wastewater.

Graphic abstract

中文翻译：

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纤维素基阳离子交换纤维作为过滤材料快速去除废水中的亚甲蓝

开发具有完美固液分离性能的环保型吸附剂，对于含染料废水的高效净化具有重要的现实意义。在此，通过工业化纤维素醚化工艺成功获得了纤维素基阳离子交换纤维生物吸附剂（CEF）。纤维形态可以保持，CEF 的平均取代度 (DS) 约为 0.19。CEF 显示出对亚甲蓝 (MB) 的高效吸附：在 5 分钟内达到 82% 的平衡吸收 (447.69 mg·g ^-1 )。特别是由CEFs和玻璃纤维形成的无纺多孔过滤材料表现出令人称赞的固/液分离特性，水过滤速度快（≈6.3 m ³ ·m ^-2 ·h^-1 ) 和高去除率 (≈ 99.2%)，当它用于从废水中吸附 MB (150 ppm) 时。此外，CEF 过滤材料可以通过简单的方法进行再生。该研究表明，绿色天然纤维材料有望用于含染料废水的经济高效净化。

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