Optimization of Cr(VI) reduction by zero-valent bimetallic nanoparticles using the response surface modeling approach

被引:68
作者
Singh, Kunwar P. [1 ]
Singh, Arun K. [1 ]
Gupta, Shikha [1 ]
Sinha, Santa [2 ]
机构
[1] CSIR, Indian Inst Toxicol Res, Div Environm Chem, Lucknow 226001, Uttar Pradesh, India
[2] CSIR, Natl Bot Res Inst, Lucknow 226001, Uttar Pradesh, India
关键词
Bimetallic zero-valent nanoparticles; Hexavalent chromium; Central composite design; Optimization; Response surface modeling; HEXAVALENT CHROMIUM; ACTIVATED CARBONS; NEURAL-NETWORK; REMOVAL; IRON; ADSORPTION; REMEDIATION; WATER; METHODOLOGY; PARTICLES;
D O I
10.1016/j.desal.2010.11.056
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Bimetallic iron-silver zero-valent nanoparticles were synthesized, characterised and studied for reduction of Cr(VI) in water solution. A four-factor, central composite design (CCD) combined with response surface modeling (RSM) and optimization was employed for maximizing the Cr(VI) reduction by the bimetallic system. Four independent variables, viz., temperature (10-50 degrees C), pH of solution (2-8), Cr(VI) concentration (30-70 mg/l), and particles dose (0.4-1.6 g/l) were transformed to coded values and a quadratic model was built to predict the responses. The significance of the independent variables and their interactions were tested by the analysis of variance (ANOVA) and t-test statistics. Adequacy of the model was tested by the correlation between experimental and predicted values of the response and enumeration of prediction errors. Model validation was performed using a second set of data. Optimization of the variables for maximum Cr-reduction by bimetallic nanoparticles was performed using the quadratic model. The model predicted maximum reduction capacity (55.96 mg/g) under the optimum conditions of Cr(VI) concentration 65.7 mg/l; temperature 43 degrees C; pH 2; and dose 0.4 g/l, which was very close to the experimental value (55.18 mg/g) determined in batch experiment and about 32% higher than the experimentally determined un-optimized reduction capacity (42.39 mg/g). (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:275 / 284
页数:10
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