文献类型：期刊文献

英文题名：Preparation of Starch-Hard Carbon Spherules from Ginkgo Seeds and Their Phenol-Adsorption Characteristics

作者：Chen, Hongxia[1,2] Wang, Chengzhang[1,2,3] Ye, Jianzhong[1,2] Zhou, Hao[1,2,3] Tao, Ran[1,2] Li, Wenjun[1,2]

第一作者：陈虹霞;Chen, Hongxia

通信作者：Wang, CZ[1];Wang, CZ[2];Wang, CZ[3]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Jiangsu, Peoples R China;[2]State Forestry Adm Peoples Republ China, Key & Open Lab Forest Chem Engn, Nanjing 210042, Jiangsu, Peoples R China;[3]Chinese Acad Forestry, Inst New Technol Forestry, Beijing 10091, Peoples R China

年份：2018

卷号：23

期号：1

外文期刊名：MOLECULES

收录：;Scopus(收录号：2-s2.0-85040623178);WOS:【SCI-EXPANDED(收录号:WOS:000425082500091)】；

基金：Support for this work by the Fundamental Research Funds of CAF (CAFYBB2014QA021) and Introduction International Advanced Forestry Science & Technology (2016-4-07) is gratefully acknowledged.

语种：英文

外文关键词：ginkgo seeds; starch; spherule; adsorption; phenols

摘要：Carbon spherules from ginkgo seed starch were prepared through stabilization and carbonization processes. The ginkgo seed starch was first stabilized at 195 degrees C for 18 h, then carbonized at 500 degrees C for 2 h under an N-2 atmosphere. The characterization results confirmed that carbon spherules were in the size range of 10-20 m. Experimental data were also evaluated to find out the kinetic characteristics of phenols on the carbon spherules during the adsorption process. Adsorption processes for phenol, p-nitrophenol and p-chlorophenol were found to follow the pseudo-first order kinetic model with R-2 values of 0.995, 0.997 and 0.998, while the rate constants k(1) = 0.014, 0.009 and 0.011 min(-1) showed that the adsorption is mainly controlled by adsorbate diffusion. The equilibrium data were analyzed with the Langmuir, Freundlich and Temkin-Pyzhev models and the best fit was observed with the Freundlich isotherm, suggesting the physical adsorption of phenols. From the thermodynamic functions, G, H, and S were calculated, which showed that adsorption is more favorable at low temperature and is an exothermic process, and the adsorption of p-nitrophenol and p-chlorophenol were more advantageous than that of phenol.