Optimized Preparation of High Value-Added Activated Carbon and Its Adsorption Properties for Methylene Blue

被引：11

作者：

Yu, Xiao ^{[1
]}

Han, Zhijing ^{[2
]}

Fang, Shuqi ^{[1
,3
]}

Chang, Chun ^{[1
,3
]}

Han, Xiuli ^{[1
,3
]}

机构：

[1] Zhengzhou Univ, Sch Chem Engn & Energy, Zhengzhou 450001, Henan, Peoples R China

[2] Henan Univ Technol, Sch Mat Sci & Engn, Zhengzhou 450001, Henan, Peoples R China

[3] Henan Ctr Outstanding Overseas Scientists, Zhengzhou 450001, Henan, Peoples R China

来源：

INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING | 2019年 / 17卷 / 08期

关键词：

corncob; response surface methodology; activated carbon; adsorption; methylene blue; isotherm; 2,4-DICHLOROPHENOXYACETIC ACID; CHEMICAL ACTIVATION; AQUEOUS-SOLUTIONS; SURFACE-AREA; CORN; HEMICELLULOSE; EQUILIBRIUM; ISOTHERMS; CELLULOSE; REMOVAL;

D O I：

10.1515/ijcre-2018-0267

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The optimal preparation conditions of activated carbon (AC) derived from corncob (CC) by steam activation were investigated using response surface methodology. In response to iodine adsorption capacity, experimental design was established using three synthetic variables based on the Box-Behnken central composite design. The optimum conditions of 892 degrees C activation temperature, 40 min residence time, and 1:1.6 the mass ratio of char to H2O gave 1216.74 mg/g iodine adsorption value. AC was characterized using instrumental analyses consist of Brunauere-Emmette-Teller (BET), Fourier transform infrared (FT-IR) and Scanning electron microscopy (SEM). The effect of experimental parameters such as adsorption time, adsorbent dosage and pH on the uptake of methylene blue (MB) were studied. Experimental equilibrium data was analyzed by the Langmuir, Freundlich, Sips and Koble-Corrigan isotherm models. The results showed that the Freundlich and Koble-Corrigan models could properly represent the adsorption behavior of MB on AC. In addition, it was known that the adsorption of MB was a spontaneous and endothermic process from the thermodynamic parameters of Delta G, Delta H and Delta S.

引用

页数：16

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