摘要
以煤质活性炭(AC)为研究对象,通过(NH_(4))_(2)S_(2)O_(8)氧化改性提高其电吸附性能。将活性炭材料制备成电极并在电容去离子技术(EST)下进行实验,对改性前后活性炭的表面形貌、表面官能团、孔结构变化进行对比分析。结果表明,活性炭经过1.5 mol/L的(NH_(4))_(2)S_(2)O_(8)改性后比电容最大;改性后的活性炭电极比电容增大,改性后相比改性前孔容、平均孔径均下降;改性后的材料表面光滑、杂质较少、孔隙结构发达、含氧官能团增多;利用单因素和Box-Behnken响应面法得到改性后材料制备的最佳工艺为:1.59 g的AC在54.22℃下氧化改性4.93 h,电极比电容为259.850 F/g,改性后电极的CV曲线证明由于其含有赝电容从而使电化学性能得到提高。
Coal-based activated carbon is oxidatively modified by(NH_(4))_(2)S_(2)O_(8)to improve its electrosorption performance.The activated carbon materials are prepared into electrodes for experiments under EST technique.The changes in surface morphology,surface functional groups and pore structure of the activated carbon before and after modification are compared and analyzed.Results show that the activated carbons modified by 1.5 mol·L^(-1)(NH_(4))_(2)S_(2)O_(8)exhibits the largest specific capacitance value.The specific capacitance of the activated carbon electrode increases after modification,but its pore capacity and average pore size decrease.The modified material has a smooth surface,less impurities,a developed pore structure and more oxygen-containing functional groups.Through using the single-factor and Box-Behnken response surface methods,the best process conditions for the preparation of the modified material are as follows:1.59 g of activated carbon has been oxidatively modified at 54.22℃for 4.93 h.The specific capacitance of the electrode is 259.850 F·g^(-1).The CV curves of the electrode proves that its electrochemical properties are improved because it contains pseudo capacitance.
作者
吴沁如
李海红
张腾
WU Qin-ru;LI Hai-hong;ZHANG Teng(School of Environmental and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710048,China)
出处
《现代化工》
CAS
CSCD
北大核心
2024年第3期168-174,181,共8页
Modern Chemical Industry
基金
陕西省科技厅社会发展领域项目(2020SF-435)
榆林市科技计划(CXY-2020-054)
西安工程大学博士科研启动基金(BS201922)。
关键词
电容去离子
电极制备
活性炭
氧化改性
响应面优化
capacitive deionization
electrode preparation
activated carbon
oxidation modification
response surface optimization
