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.
Optimization of Defluorination Efficiency Using Modified Alumina Adsorption Based on Response Surface Methodology
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第1期
Page:
78-84
Column:
Date of publication:
2026-01-01
- Keywords:
- modified alumina; response surface methodology; adsorption; defluorination; performance optimization
- 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.
Last Update:
2026-01-01