WEIChen,RENHuixue,LIANGWeichun,et al.Optimization of Defluorination Efficiency Using Modified Alumina Adsorption Based on Response Surface Methodology[J].China Water & Wastewater,2026,42(1):78-84.
基于响应面法的改性氧化铝吸附除氟效能优化
- Title:
- Optimization of Defluorination Efficiency Using Modified Alumina Adsorption Based on Response Surface Methodology
- Keywords:
- modified alumina; response surface methodology; adsorption; defluorination; performance optimization
- 摘要:
- 针对水体氟污染治理需求，通过化学浸渍法成功制备了铈改性纳米氧化铝（CA）吸附材料，并基于响应面法（RSM）构建了多因素协同优化体系。采用Box-Behnken实验设计方法，系统考察了反应时间、溶液pH和CA投加量对氟离子去除率的影响，建立了以去除率为响应值的二次多项式回归模型。方差分析结果表明，各因素显著性顺序为pH（P0.000 1）CA投加量（P0.000 1）反应时间（P0.000 1），模型失拟项不显著（P=0.359 6），证实了模型的可靠性。优化后的工艺参数如下：反应时间为122 min、pH为6.65、CA投加量为2.16 g/L，此时对氟离子的理论去除率达87.49%，经验证实际去除率为90.53%，绝对误差仅为3.04%，氟离子浓度可降至1.17 mg/L，满足《地表水环境质量标准》（GB 3838—2002）Ⅲ类水要求（≤1.5 mg/L）。通过扫描电子显微镜-能量色散X射线光谱仪（SEM-EDS）、X射线光电子能谱仪（XPS）、拉曼光谱表征证实，铈元素成功负载于纳米氧化铝上，增加了活性位点，提高了氟离子去除率。
- Abstract:
- In response to the growing demand for fluoride pollution control in aquatic environments, cerium-modified nano-alumina (CA) adsorption materials were successfully prepared via the chemical impregnation method, and a multi-factor collaborative optimization system was established using the response surface methodology (RSM). Box-Behnken experimental design was employed to systematically evaluate the effects of reaction time, solution pH, and CA dosage on the fluoride ion removal rate. A quadratic polynomial regression model was subsequently developed with removal rate as the response variable. The analysis of variance results indicated that the factors were significant in the following descending order: pH (P0.000 1), CA dosage (P0.000 1) and reaction time (P0.000 1), while the lack-of-fit term of the model was not statistically significant (P=0.359 6), thereby confirming the model’s reliability. The optimized process parameters were determined as follows: reaction time of 122 minutes, pH of 6.65, and CA dosage of 2.16 g/L. Under these conditions, the theoretical fluoride ion removal rate reached 87.49%, while the experimentally verified removal rate was 90.53%, yielding a absolute error of only 3.04%. The residual fluoride ion concentration after treatment was reduced to 1.17 mg/L, which complied with the class Ⅲ water quality limit (1.5 mg/L) specified in Environmental Quality Standards for Surface Water (GB 3838-2002). The characterization using scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy confirmed the successful loading of cerium onto nano-alumina, which increased the number of active sites and enhanced the fluoride ion removal efficiency.
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