This study aimed to investigate the sorption of anionic dyes (Reactive Black 5, Reactive Yellow 84, Acid Red 18, and Acid Yellow 23) by cotton fibers aminated with epichlorohydrin and ammonia water (ACFs) as well by unmodified cotton fibers (CFs). CFs and ACFs were characterized based on FTIR, elemental analysis (C/N content) and pH_PZC. The effect of solution pH (pH 2–11) and contact time on the removal of dye was studied as well. The kinetic experimental data were fitted to pseudo-first order, pseudo-second order, and intraparticle diffusion model. Equilibrium isotherms were analyzed based on Langmuir and Freundlich isotherms. The efficiency of dye sorption on CFs was the most effective at pH 2, whereas on ACFs—at pH 3–4. ACFs and CFs changed the pH value of the sorption solution. The system tended to obtain a pH value close to the pH_PZC value of the sorbent (pH_PZC = 7.85 for CFs/pH_PZC = 8.15 for ACFs). ACFs had a shorter dye sorption equilibrium time compared to the CFs. The sorption of dyes on cotton sorbents proceeded in 2 main phases. The best match to the experimental data was shown by the pseudo-secondary model. Having amine functional groups, the ACFs ensured far better sorption of anionic dyes than CFs did. The maximum Reactive Black 5 sorption capacity of ACFs was Q_max = 36.77 mg/g, which was 1240% higher than that of CFs (Q_max = 2.74 mg/g).

这项研究旨在研究表氯醇和氨水（ACF）胺化的棉纤维以及未改性棉纤维（CFs）对阴离子染料（活性黑5，活性黄84，酸性红18和酸性黄23）的吸附。基于FTIR，元素分析（C / N含量）和pH _PZC表征CF和ACF。还研究了溶液pH（pH 2-11）和接触时间对染料去除的影响。将动力学实验数据拟合为伪一级，伪二级和粒子内扩散模型。根据Langmuir和Freundlich等温线分析平衡等温线。在pH 2下，CFs上染料的吸附效率最有效，而在pH 3–4下，ACFs上染料的吸附效率最高。ACF和CF改变了吸附溶液的pH值。系统倾向于获得接近吸附剂的pH _PZC值的pH值（ 对于CFs / pH _PZC， pH _PZC = 7.85 = 8.15（对于ACF）。与CF相比，ACF具有更短的染料吸附平衡时间。染料在棉吸附剂上的吸附分为两个主要阶段。伪二级模型显示了与实验数据的最佳匹配。ACF具有胺官能团，可确保阴离子染料比CF更好地吸附。ACF的最大活性黑5吸附容量为Q _max  = 36.77 mg / g，比CFs（Q _max  = 2.74 mg / g）高1240％。