High loaded textile dying effluents should undergo for treatment prior to final disposal into the environment. The current study aimed to apply naturally abundant and cheap by-product material namely sawdust (SWD) to develop magnetized cellulosic nano-adsorbent based on magnetite nanoparticles for reactive dye removal namely Synozol Red K-HL (R K-HL). The powder of SWD, which is available through various industries, was modified via pre-treatment with acid hydrolysis and bleaching before blending them with magnetite particles which is synthesized via co-precipitation route. Sawdust (SWD) conjugated with Fe₃O₄ at different weight percentages (wt%), i.e. SF-(1:1), SF-(2:1), SF-(3:1), SF-(5:1) and SF-(1:2), then subjected to microwave technique, and then characterized by X-ray diffraction spectroscopy (XRD); transmission electron microscope (TEM); Fourier transform infrared (FTIR). Thereafter, the effects of system parameters on adsorption capability, i.e. pH, temperature and dye loading were studied using the modified adsorbents. The SF-(2:1) adsorbent showed the highest affectivity which achieved the highest (21.71 mg g⁻¹) adsorption uptake with a catalyst dosage of 1 g L⁻¹. Moreover, a complete dye removal (100%) was attained at low initial dye loading in the aqueous medium. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D-R) isotherm models and their corresponding constants were calculated and discussed. The experimental results showed that the Langmuir isotherm model is well expressed in the experimental data. The kinetics of R K-HL dye removal was found to depend on operational temperature. A study of three kinetic models has been made, and the Bangham’s kinetic model was found to describe the adsorption of dye R K-HL on all the adsorbents applied. The adsorption of reactive R K-HL onto magnetized sawdust adsorbents was spontaneous and exothermic in nature as concluded from thermodynamic assays. Experimental results verified that dye R K-HL could be successfully eliminated feasibly from the aqueous stream in economic way.

高负荷的纺织品染色废水在最终排放到环境中之前应进行处理。目前的研究旨在应用天然丰富且廉价的副产品材料锯末 (SWD) 开发基于磁铁矿纳米颗粒的磁化纤维素纳米吸附剂，用于去除活性染料，即 Synozol Red K-HL (R K-HL)。SWD 粉末可通过各种行业获得，通过酸水解和漂白预处理进行改性，然后将它们与通过共沉淀路线合成的磁铁矿颗粒混合。_{与 Fe 3} O ₄共轭的锯末 (SWD)在不同的重量百分比（wt%）下，即SF-（1:1）、SF-（2:1）、SF-（3:1）、SF-（5:1）和SF-（1:2），然后进行微波技术，然后通过X射线衍射光谱（XRD）进行表征；透射电子显微镜（TEM）；傅里叶变换红外 (FTIR)。此后，使用改性吸附剂研​​究了系统参数对吸附能力的影响，即pH、温度和染料负载。SF-(2:1) 吸附剂表现出最高的活性，在催化剂用量为 1 g L ^-1的情况下达到最高的（21.71 mg g ^{-1 ）吸附吸收}. 此外，在水性介质中的低初始染料负载量下实现了完全的染料去除 (100%)。计算和讨论了 Langmuir、Freundlich、Temkin 和 Dubinin-Radushkevich (DR) 等温线模型及其相应的常数。实验结果表明，实验数据很好地表达了朗缪尔等温线模型。发现 R K-HL 染料去除的动力学取决于操作温度。已经对三种动力学模型进行了研究，发现 Bangham 动力学模型描述了染料 R K-HL 在所有应用的吸附剂上的吸附。从热力学分析得出结论，活性 R K-HL 在磁化锯末吸附剂上的吸附本质上是自发的和放热的。