ABSTRACT

β-cyclodextrin(β-CD) was immobilised onto mesoporous silica using 1,1′-carbonyldiimidazole and tetraethyl orthosilicate as raw materials to construct adsorbent in dye wastewater treatment. The mesoporous structure of β-CD@SiO₂-1 was characterised by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), specific surface area measurement (BET), thermogravimetric (TG) and scanning electron microscopy (SEM). The adsorption experiments were studied by response surface method (RSM) to optimise various parameters such as initial concentration, contact time and adsorbent dosage on the adsorption property of β-CD@SiO₂-1 to methyl violet. The optimum process conditions were initial concentration 34 mg/L, contact time 13 h and adsorbent dose 5 mg. The adsorption rates correspond to the pseudo-second-order kinetic model. The adsorption isotherm was suited to the Langmuir isotherm model. The thermodynamic parameters (ΔG°, ΔH°, ΔS°) were obtained. As a result, it was found that the adsorption process was exothermic and spontaneous.

摘要

以1,1'-羰基二咪唑和原硅酸四乙酯为原料，将β-环糊精（β-CD）固定在介孔硅胶上，构建染料废水处理吸附剂。β-CD@SiO ₂ -1的介孔结构通过傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）、比表面积测量（BET）、热重（TG）和扫描电子显微镜（扫描电镜）。采用响应面法(RSM)对吸附实验进行研究,优化初始浓度、接触时间、吸附剂用量等参数对β-CD@SiO ₂吸附性能的影响-1 到甲基紫。最佳工艺条件为初始浓度 34 mg/L、接触时间 13 h 和吸附剂剂量 5 mg。吸附速率对应于准二级动力学模型。吸附等温线符合朗缪尔等温线模型。获得了热力学参数（ΔG°、ΔH°、ΔS°）。结果发现吸附过程是放热和自发的。