In this research, a novel chitosan (CS)–vanadium-titanium-magnetite (VTM) composite was designed and synthesized. The interaction between CS-VTM and Congo red (CR) dye conformed to a pseudo-second-order model to support the potent involvement of chemisorption. The effects of adsorbent dosage, reaction temperature, and initial solution pH on adsorption of CR were investigated. Approximately 99.1% of CR (100 mg/L) was adsorbed at a CS-VTM dose of 2.0 g/L or above, while such a reaction was favored at temperatures of 65 °C and pH of 6.0. Thermodynamically, the adsorption of CR proceeded spontaneously (ΔG < 0) above 35 °C. According to scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, and zeta potential analysis, its adsorption on CS-VTM can be attributed to electrostatic attraction and hydrogen bonds. The prepared CS-VTM exhibited superior adsorption performance on removal of CR as evidenced by significantly large partition coefficient of 108.3 mg g⁻¹ μM⁻¹ (equilibrium adsorption capacity of 62.2 mg/g at CR dose of 100 mg/L). Overall, the CS-VTM proved to be a promising and environmentally friendly adsorbent for the highly efficient and effective removal of organic dyes among the comparable sorbents studied to date.

在这项研究中，设计并合成了一种新型的壳聚糖（CS）-钒钛磁铁矿（VTM）复合材料。CS-VTM和刚果红（CR）染料之间的相互作用符合伪二级模型，以支持化学吸附的有效参与。研究了吸附剂用量，反应温度和初始溶液pH值对CR吸附性能的影响。当CS-VTM剂量为2.0 g / L或更高时，约99.1％的CR（100 mg / L）被吸附，而这种反应在65℃和pH值为6.0时是有利的。在热力学上，CR的吸附在高于35°C时自发进行（ΔG<0）。根据扫描电子显微镜，X射线光电子能谱，傅立叶变换红外光谱仪和Zeta电位分析，它在CS-VTM上的吸附可归因于静电吸引和氢键。制备的CS-VTM在去除CR方面表现出优异的吸附性能，这由108.3 mg g的显着大分配系数所证明^-1 μM ^-1（平衡吸附的62.2容量毫克/克在CR剂量为100mg / L）。总体而言，CS-VTM被证明是一种有前途的，对环境友好的吸附剂，可以高效，有效地去除迄今为止研究的同类吸附剂中的有机染料。