KOH溶液浸渍法活化处理煤基电极材料的研究
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摘要
采用KOH溶液浸渍法对夹杂碳纤维的煤基电极材料(CBCF)进行活化处理,主要研究了KOH浓度对CBCF结构与性能的影响规律,确定了最佳工艺条件与技术参数。并利用SEM-EDS、FT-IR、N2吸附仪等对煤基极板的形貌特征、表面官能团及孔径结构进行分析表征。研究结果表明,随着KOH浓度的增加,CBCF表面性能、孔结构以及电化学性能均得到了极大的改善。随着KOH浓度的升高,CBCF的循环伏安曲线的面积逐渐增大,而体系的传质阻抗则逐渐减小。以CBCF为主电极,活性炭为粒子电极,采用三维电极体系处理氰化废水,当电压为4 V、时间为5 h、极距为10 mm时,废水中总氰、游离氰去除率达到94%以上。
KOH solution impregnation method is used to activate the coal-based carbon fiber-containing(CBCF)electrode material.The effect of KOH concentration on the structure and properties of CBCF is studied mainly and the optimum process conditions and technical parameters are determined.SEM-EDS,FT-IR and N2 adsorption instruments are utilized to analyze and characterize the morphology,surface functional groups and pore size structures of coal-base electrode plates. Study results illustrate that the surface properties,pore structure and electrochemical performance of CBCF are improved greatly with the increase of KOH concentration.With the increase of KOH concentration,the area of cyclic voltammetry curve of CBCF increases gradually while the mass transfer impedance of CBCF decreases gradually.A three-dimensional electrode system with CBCF as main electrode and activated carbon as particle electrode is used to treat with cyanide-containing wastewater.The removal rates of both total cyanide and free cyanide in wastewater exceed94% when the voltage is 4 V,time is 5 h and the polar distance is 10 mm.
KOH solution impregnation method is used to activate the coal-based carbon fiber-containing(CBCF)electrode material.The effect of KOH concentration on the structure and properties of CBCF is studied mainly and the optimum process conditions and technical parameters are determined.SEM-EDS,FT-IR and N2 adsorption instruments are utilized to analyze and characterize the morphology,surface functional groups and pore size structures of coal-base electrode plates. Study results illustrate that the surface properties,pore structure and electrochemical performance of CBCF are improved greatly with the increase of KOH concentration.With the increase of KOH concentration,the area of cyclic voltammetry curve of CBCF increases gradually while the mass transfer impedance of CBCF decreases gradually.A three-dimensional electrode system with CBCF as main electrode and activated carbon as particle electrode is used to treat with cyanide-containing wastewater.The removal rates of both total cyanide and free cyanide in wastewater exceed94% when the voltage is 4 V,time is 5 h and the polar distance is 10 mm.
引文
[1]姚迪,宋永辉,张珊,等.KOH添加量对煤基电极材料结构与性能的影响[J].煤炭转化,2017,40(6):41-47.
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[11]马亚芬,谌伦建,张传祥,等.煤基活性炭电极材料的改性方法研究现状[J].材料导报,2011,25(17):42-45.
[12]宋永辉,田慧,李延霞,等.硝酸浓度对煤基电极材料结构与性能的影响[J].煤炭转化,2015,38(4):84-88.
[13]张军,解强,李兰亭.煤质活性炭脱灰工艺的研究进展[J].煤化工,2007,35(2):20-23.
[14]岳晓明,吴雅俊,张双全,等.物理化学两步活化法制备煤基活性炭电极材料[J].中国矿业大学学报,2017,46(4):888-894.
[15]田宇红,兰新哲,周军,等.微波辐射-KOH活化兰炭粉制备活性炭[J].化学工程,2010,38(10):225-228.
[16]Xue Ruisheng,Shen Zengmin. Formation of graphite-potassium intercalation copounds during activation of MCMB with KOH[J].Carbon,2003,41:1851-1864.
[17]马承愚,毛宇,徐鹏飞,等.KOH/Na OH活化法辣椒秸秆制备高表面积活性炭与表征[J].功能材料,2013,44(5):704-708.
[18]王秀芳,张会平,陈焕钦.KOH活化法高比表面积竹质活性炭的制备与表征[J].功能材料,2006,37(4):675-679.
[19]陈健军.活化工艺对PAN基活性碳纤维结构和性能的影响[D].北京:北京化工大学,2017.
[20]邢宝林,谌伦建,张传祥,等.KOH活化法制备褐煤基活性炭的活化机理研究[J].中国矿业大学学报,2014,43(6):1038-1045.
[2]何沛,刘志华,向能军,等.KOH活化法制备活性碳及其应用研究[J].云南民族大学学报(自然科学版),2017,26(3):202-205.
[3]蒋绍阶,马丹丹,盛贵尚,等.KOH改性活性炭涂层电极的电容去离子性能研究[J].工业水处理,2015,35(9):53-56.
[4]Li Shijie,Han Kuihua,Li Jinxiao,et al.Preparation and characterization of super activated carbon produced from gulfweed by KOH activation[J]. Microporous and Mesoporous Materials,2017,(243):291-300.
[5]Hsu L Y,Teng H. Influence of different chemical reagents on the preparation of activated carbons from bituminous coal[J].Fuel Processing Technology,2000,64(1-3):155-166.
[6]邢宝林,李龙,马爱玲,等.微波法煤基活性炭的制备及其电化学性能研究[J].材料导报,2013,27(18):133-136.
[7]宋永辉,李延霞,史军伟,等.煤基成型活性炭活化实验研究及性能表征[J].材料导报,2014,28(10):25-28.
[8]马巧娜.陕北低变质粉煤共热解特性及机理研究[D].西安:西安建筑科技大学,2017.
[9]张珊,宋永辉,姚迪,等.硝酸改性对煤基电极材料结构及吸附性能的影响[J].煤炭科学技术,2017,45(3):201-206.
[10]谌伦建,邢宝林,马亚芬,等.氨解改性煤基活性炭电极材料的电化学性能[J].中国矿业大学学报,2013,42(3):454-460.
[11]马亚芬,谌伦建,张传祥,等.煤基活性炭电极材料的改性方法研究现状[J].材料导报,2011,25(17):42-45.
[12]宋永辉,田慧,李延霞,等.硝酸浓度对煤基电极材料结构与性能的影响[J].煤炭转化,2015,38(4):84-88.
[13]张军,解强,李兰亭.煤质活性炭脱灰工艺的研究进展[J].煤化工,2007,35(2):20-23.
[14]岳晓明,吴雅俊,张双全,等.物理化学两步活化法制备煤基活性炭电极材料[J].中国矿业大学学报,2017,46(4):888-894.
[15]田宇红,兰新哲,周军,等.微波辐射-KOH活化兰炭粉制备活性炭[J].化学工程,2010,38(10):225-228.
[16]Xue Ruisheng,Shen Zengmin. Formation of graphite-potassium intercalation copounds during activation of MCMB with KOH[J].Carbon,2003,41:1851-1864.
[17]马承愚,毛宇,徐鹏飞,等.KOH/Na OH活化法辣椒秸秆制备高表面积活性炭与表征[J].功能材料,2013,44(5):704-708.
[18]王秀芳,张会平,陈焕钦.KOH活化法高比表面积竹质活性炭的制备与表征[J].功能材料,2006,37(4):675-679.
[19]陈健军.活化工艺对PAN基活性碳纤维结构和性能的影响[D].北京:北京化工大学,2017.
[20]邢宝林,谌伦建,张传祥,等.KOH活化法制备褐煤基活性炭的活化机理研究[J].中国矿业大学学报,2014,43(6):1038-1045.
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