The use of eco-friendly techniques and green reagents to modify the properties of synthetic biopolymers is attracting an increasing attention. In this work, L-cysteine (CYS) modified polyvinyl alcohol electrospun fibers (PVA-CYS) were prepared using an easy, fast, and green technique. The incorporation of CYS as a source of nitrogen and sulfur shows an important enhancement in dye removal efficiency compared to polyvinyl alcohol fibers (PVA). The successful grafting of CYS on PVA was proved by FTIR, elemental analysis, SEM, AFM and TGA analysis. Doehlert experimental design was used to optimize the adsorption process of crystal violet (CV) on PVA and PVA-CYS. The two models show good correlations between experimental and predicted responses, with coefficients of determination equal to 0.946 and 0.976, for PVA and PVA-CYS, respectively. The most influencing parameter was the pH for CV removal by adsorption on PVA. However, this parameter affects less the dye removal using PVA-CYS. The modified fibers exhibit excellent adsorption ability toward CV, and the maximum adsorption capacity reaches 197 mg g⁻¹ at neutral pH. An application of this process on a doped real wastewater demonstrates its efficacity and selectivity with a percentage of removal up to 85%.

使用环保技术和绿色试剂来改变合成生物聚合物的性能正引起越来越多的关注。在这项工作中，采用简单、快速、绿色的技术制备了 L-半胱氨酸（CYS）改性聚乙烯醇电纺纤维（PVA-CYS）。与聚乙烯醇纤维 (PVA) 相比，掺入 CYS 作为氮和硫源可显着提高染料去除效率。通过FTIR、元素分析、SEM、AFM和TGA分析证明CYS在PVA上的成功接枝。采用Doehlert实验设计优化了PVA和PVA-CYS上结晶紫(CV)的吸附过程。这两个模型显示实验响应和预测响应之间具有良好的相关性，PVA 和 PVA-CYS 的决定系数分别等于 0.946 和 0.976。对 PVA 吸附去除 CV 影响最大的参数是 pH 值。然而，该参数对使用 PVA-CYS 的染料去除影响较小。改性纤维对CV表现出优异的吸附能力，在中性pH下最大吸附容量达到197 mg g ^-1。该工艺在掺杂真实废水中的应用证明了其有效性和选择性，去除率高达 85%。