| Title: | Straw-Based Activated Carbon: Optimization of the Preparation Procedure and Performance of Volatile Organic Compounds Adsorption |
| Address: | "Key Lab for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. Department of Chemical Engineering, Tianjin University Renai College, Tianjin 301636, China. National Engineering Research Center for Distillation Technology, Tianjin University, Tianjin 300072, China. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China" |
| ISSN/ISBN: | 1996-1944 (Print) 1996-1944 (Electronic) 1996-1944 (Linking) |
| Abstract: | "Straw is one of the largest agricultural biowastes and a potential alternative precursor of activated carbon. Activated carbon prepared from different types of straw have great differences in structure and adsorption performance. In order to explore the performance of different straw-based activated carbon in volatile organic compounds adsorption, five common straws were selected as potential source materials for the preparation of SAC. The straw-based activated carbons were prepared and characterized via a thermo-gravimetric analysis, scanning electron microscope and the Brunauer-Emmett-Teller method. Among the five straw-based activated carbons, millet straw-derived activated carbon exhibited superior properties in S(BET), S(mic) and adsorption capacities of both toluene and ethyl acetate. Furthermore, the preparation process of millet straw activated carbon was optimized via response surface methodology, using carbonization temperature, carbonization time and impregnation ratio as variables and toluene adsorption capacity, ethyl acetate adsorption capacity and activated carbon yield as responses. The optimal preparation conditions include a carbonization temperature of 572 degrees C, carbonization time of 1.56 h and impregnation ratio (ZnCl(2)/PM, w/w) of 1.60, which was verified experimentally, resulting in millet straw activated carbon with a toluene adsorption capacity of 321.9 mg/g and ethyl acetate adsorption capacity of 240.4 mg/g. Meanwhile, the adsorption isothermals and regeneration performance of millet straw activated carbon prepared under the optimized conditions were evaluated. The descriptive ability of the isothermals via the Redlich-Peterson equation suggests a heterogeneous surface on millet straw activated carbon. Recyclability testing has shown that millet straw activated carbon maintained a stable adsorption capacity throughout the second to fifth cycles. The results of this work indicate that millet straw activated carbon may be a potential volatile organic compound adsorbent for industrial application" |
| Keywords: | activated carbon optimization response surface methodology straw volatile organic compounds removal; |
| Notes: | "PubMed-not-MEDLINELi, Zhen Li, Yonghong Zhu, Jiang eng Switzerland 2021/07/03 Materials (Basel). 2021 Jun 14; 14(12):3284. doi: 10.3390/ma14123284" |
