Application of response surface methodology for chromium removal by adsorption on low-cost biosorbent
Application of response surface methodology for chromium removal by adsorption on low-cost biosorbent
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DOI：
10.1016/j.chemolab.2019.03.014
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发表时间：
2019-06-15
影响因子：
3.9
通讯作者：
Hamrouni, B.
中科院分区：
文献类型：
--
作者：
Ben Khalifa, E.;Rzig, B.;Hamrouni, B.
本文主要研究了响应面方法对影响生物吸附去除橙皮铬的参数进行优化的效率。采用Doehlert实验设计确定最佳工艺条件。采用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、Brunauer-Emmett-Teller(BET)和Boehm法对生物吸附剂进行了表征。结果表明，该吸附剂的零电荷pH=2，比表面积约为2m(2)g(-1)。对实验结果进行方差分析，结果表明模型回归是可以接受的。决定系数R-2=0.995，表明预测响应与实验响应之间有很好的相关性。当吸附剂用量为1.12g，pH=2，温度为34.17℃时，脱色率最高，为97%，最大吸附容量为7.14mgg-1。吸附过程为吸热过程，符合准二级模型。
This work focuses on the efficiency of the response surface methodology to optimize the parameters affecting the chromium removal by biosorption on orange peels. A Doehlert experimental design was applied to determine the optimum conditions. Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), and Boehm method were used to characterize the biosorbent. The characterization of the adsorbent revealed that the pH of zero charge is equal to 2, the specific area is about 2 m(2) g(-1). The experimental results were analyzed by the ANOVA test and showed that the model regression is acceptable. The determination coefficient R-2 was equal to 0.995 suggesting an excellent relationship between predicted and experimental responses. The highest removal yield (97%) was obtained under the following conditions: adsorbent amount of 1.12 g, a pH equal to 2 and a temperature of 34.17 degrees C. Langmuir and Temkin isotherms were found to be the best fitted models, and the maximum adsorption capacity was 7.14 mg g(-1). The adsorption process is endothermic and fits the pseudo second order model.