Hybrid crosslinked chitosan-epichlorohydrin/TiO₂ nanocomposite (CTS-ECH/TNC) was synthesized as an inorganic–organic hybrid nanocomposite bioadsorbent for the removal of reactive red 120 (RR120) dye from aqueous environment. Various analytical techniques were utilized to investigate the surface area, surface morphology, martial crystallinity, elemental composition, amino group content, and fundamental functional group of CTS-ECH/TNC. The impact of key adsorption parameters such as adsorbent dosage (0.02–1.2 g), initial RR120 dye concentration (30–400 mg/L), solution pH (3–12), contact time (0–300 min), and temperature (303–323 K) were explored by batch adsorption process. The adsorption data were well illustrated by pseudo-second order (PSO) kinetic and Langmuir isotherm model. The adsorption process was also found to be a spontaneous and endothermic in nature as indicated by thermodynamic study. The maximum adsorption capacity of CTS-ECH/TNC for RR120 dye was recorded to be 210 mg/g at 303 K. Various types of interactions such as electrostatic attraction, n-π stacking, and H-bonding were responsible for adsorbing RR120 dye molecules on the surface of CTS-ECH/TNC as investigated by tailored adsorption mechanism. Thus, this work introduces CTS-ECH/TNC as promising hybrid biosorbent for the removal of RR120 dye as model of reactive azo dyes from aqueous environment.

杂化交联壳聚糖-表氯醇/ TiO ₂纳米复合材料（CTS-ECH / TNC）被合成为无机-有机杂化纳米复合生物吸附剂，用于从水性环境中去除活性红120（RR120）染料。利用各种分析技术研究了CTS-ECH / TNC的表面积，表面形态，武术结晶度，元素组成，氨基含量和基本官能团。关键吸附参数的影响，例如吸附剂剂量（0.02–1.2 g），初始RR120染料浓度（30–400 mg / L），溶液pH（3–12），接触时间（0–300分钟）和温度（ 303–323 K）通过分批吸附法进行了探索。吸附数据已通过拟二阶动力学（PSO）和Langmuir等温线模型很好地说明了。如热力学研究所示，吸附过程本质上也是自发的和吸热的。记录的CTS-ECH / TNC在303 K时对RR120染料的最大吸附容量为210 mg / g。各种类型的相互作用（如静电吸引，n-π堆积和H键）是导致RR120染料分子吸附的原因。通过量身定制的吸附机制研究了CTS-ECH / TNC的表面 因此，这项工作将CTS-ECH / TNC引入作为有前途的混合生物吸附剂，以去除RR120染料，作为水性环境中反应性偶氮染料的模型。通过量身定制的吸附机理研究表明，H键和H键可将RR120染料分子吸附在CTS-ECH / TNC表面。因此，这项工作将CTS-ECH / TNC引入作为有前途的混合生物吸附剂，以去除RR120染料，作为水性环境中反应性偶氮染料的模型。通过量身定制的吸附机理研究表明，H键和H键可将RR120染料分子吸附在CTS-ECH / TNC表面。因此，这项工作将CTS-ECH / TNC引入作为有前途的混合生物吸附剂，以去除RR120染料，作为水性环境中反应性偶氮染料的模型。