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首页> 外文期刊>Journal of Environmental Science and Health >Multivariate optimization of process parameters in the synthesis of calcined Ca-Al (NO3) LDH for defluoridation using 3(3) factorial, central composite and Box-Behnken design
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Multivariate optimization of process parameters in the synthesis of calcined Ca-Al (NO3) LDH for defluoridation using 3(3) factorial, central composite and Box-Behnken design

机译：使用3（3）析因，中心复合材料和Box-Behnken设计对煅烧的Ca-Al（NO3）LDH进行脱氟合成过程参数的多变量优化

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摘要

Response surface methodology was applied for the first time in the optimization of the preparation of layered double hydroxide (LDH) for defluoridation. The influence of three vital process parameters (viz. pH, molar ratio and calcination temperature) in the synthesis of the adsorbent Calcined Ca-Al (NO3) LDH' was thoroughly examined to maximize its fluoride scavenging potential. The process parameters were optimized using the 3(3) factorial, face centered central composite and Box-Behnken designs and a comparative assessment of the methods was conducted. The maximum fluoride removal efficiency was achieved at a calcination temperature of approximately 500 degrees C; however, the efficiency decreased with increasing pH and molar ratio. The outcome of the comparative assessment clearly delineates the case specific nature of the models. A better predictability over the entire experimental domain was obtained with the 3(3) factorial method, whereas the Box-Behnken design was found to be the most efficient model with lesser number of experimental runs. The desirability function technique was performed for optimizing the response, wherein face centered central composite design exhibited a maximum desirability. The calcined Ca-Al (NO3) LDH, synthesized under the optimum conditions, demonstrated the removal efficiencies of 95% and 99% for the doses of 3g L-1 and 5g L-1, respectively.
机译：响应面分析法首次用于优化层状双氢氧化物（LDH）的脱氟制备。彻底检查了吸附剂煅烧的Ca-Al（NO3）LDH'的合成过程中三个重要工艺参数（即pH，摩尔比和煅烧温度）的影响，以最大程度地发挥其除氟潜力。使用3（3）阶乘，面心中央复合材料和Box-Behnken设计对工艺参数进行了优化，并对方法进行了比较评估。在大约500摄氏度的煅烧温度下达到最大的除氟效率；然而，效率随着pH值和摩尔比的增加而降低。比较评估的结果清楚地说明了模型的案例特定性质。使用3（3）阶乘方法可以获得在整个实验范围内更好的可预测性，而Box-Behnken设计被认为是效率最高的模型，实验次数较少。进行了可取性函数技术以优化响应，其中以面部为中心的中央复合设计显示出最大的可取性。在最佳条件下合成的煅烧Ca-Al（NO3）LDH对3g L-1和5g L-1的剂量分别显示出95％和99％的去除效率。

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