微波与氧化剂改性活性炭及SO_2吸附实验
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摘要
采用微波辐照与氧化剂浸泡对椰壳活性炭进行改性研究。通过BET、SEM、FTIR对其表面物理化学性质进行表征。结果表明,微波与氧化改性均能丰富活性炭表面孔隙结构;活性炭改性后表面O—H、C—O、CO等含氧官能团含量增加,微波与K2Cr2O7浸泡共同改性样品的增加最为明显。脱硫实验结果表明,椰壳活性炭改性后,SO2吸附能力明显提高,微波与K2Cr2O7浸泡共同改性效果最佳,在60℃、烟气流量0.4 L/min时吸附量为33.31 mg/g;在烟气流量0.4~1 L/min之间,活性炭的吸附量随烟气流量的增加而减少;在60~120℃,随着温度升高,活性炭的初始吸附速率和吸附量均减小。
The coconut shell activated carbons modified by microwave irradiation and oxidant soaking were studied experimentally. The physicochemical properties were characterized by BET,SEM and FTIR spectroscopy. The results showed that the pore structures were enriched by the modification of microwave and oxidant. Furthermore,the contents of O — H,C — O and C O were increased after modification,and the increasement by microwave and K_2Cr_2O_7 soaking co-modification was the most obvious. The desulfurization results showed that the desulfurization capacity of modified activated carbons were improved,and the adsorption capacity of microwave with K_2Cr_2O_7 was the best,for which the capacity of SO2 was 33. 31 mg/g at 60 ℃,0. 4 L/min. In addition,the amount of SO2 adsorption decreased with gas-flow rate from 0. 4 to 1 L/min,the adsorption rate and capacity were also decreased with temperature from 60 to 120 ℃.
The coconut shell activated carbons modified by microwave irradiation and oxidant soaking were studied experimentally. The physicochemical properties were characterized by BET,SEM and FTIR spectroscopy. The results showed that the pore structures were enriched by the modification of microwave and oxidant. Furthermore,the contents of O — H,C — O and C O were increased after modification,and the increasement by microwave and K_2Cr_2O_7 soaking co-modification was the most obvious. The desulfurization results showed that the desulfurization capacity of modified activated carbons were improved,and the adsorption capacity of microwave with K_2Cr_2O_7 was the best,for which the capacity of SO2 was 33. 31 mg/g at 60 ℃,0. 4 L/min. In addition,the amount of SO2 adsorption decreased with gas-flow rate from 0. 4 to 1 L/min,the adsorption rate and capacity were also decreased with temperature from 60 to 120 ℃.
引文
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[4]Lizzio A A,De Barr J A.Mechanism of SO2removal by carbon[J].Energy&Fuels,1997,11(2):284-291.
[5]Rezaei F,Rownaghi A A,Monjezi S,et al.SOx/NOxremoval from flue gas streams by solid adsorbents:a review of current challenges and future directions[J].Energy&Fuels,2015,29(9):5467-5486.
[6]Liu S J,Cao F F.Effect of chemical properties on SO2removal by activated carbons[J].Journal of China Coal Society,2013,38(7):1242-1247.
[7]Bhatnagar A,Hogland W,Marques M,et al.An overview of the modification methods of activated carbon for its water treatment applications[J].Chemical Engineering Journal,2013,219(3):499-511.
[8]Zhang L Q,Jiang H T,Chun-Yuan M A,et al.Microwave regeneration characteristics of activated carbon for flue gas desulfurization[J].Journal of Fuel Chemistry&Technology,2012,40(11):1366-1371.
[9]李兵,蒋海涛,张立强,等.微波加热改性活性炭及其对SO2吸附性能的影响[J].中国电机工程学报,2012,32(29):45-51.
[10]Zhang L,Cui L,Wang Z,et al.Modification of activated carbon using microwave radition and its effects on the adsorption of SO2[J].Journal of Chemical Engineering of Japan,2016,49(1):52-59.
[11]韩庆虹,金永龙,苍大强,等.微波改性对吸附剂脱硫脱氮性能的影响研究[J].钢铁,2009,44(6):85-88.
[12]Foroushani F T,Tavanai H,Hosseini F A.An investigation on the effect of KMn O4on the pore characteristics of pistachio nut shell based activated carbon[J].Microporous&Mesoporous Materials,2016,230:39-48.
[13]Tazibet S,Boucheffa Y,Lodewyckx P.Heat treatment effect on the textural,hydrophobic and adsorptive properties of activated carbons obtained from olive waste[J].Microporous&Mesoporous Materials,2013,170(4):293-298.
[14]Dandekar A,Baker R T K,Vannice M A.Characterization of activated carbon,graphitized carbon fibers and synthetic diamond powder using TPD and DRIFTS[J].Carbon,1998,36(12):1821-1831.
[15]Ros T G,van Dillen A J,Geus J W,et al.Surface structure of untreated parallel and fishbone carbon nanofibres:an infrared study[J].Chemphyschem,2002,3(2):209.
[16]Wu C,Song M,Jin B,et al.Adsorption of sulfur dioxide using nickel oxide/carbon adsorbents produced by one-step pyrolysis method[J].Journal of Analytical&Applied Pyrolysis,2013,99(99):137-142.
[17]Guo J X,Liang J,Chu Y H,et al.Desulfurization activity of nickel supported on acid-treated activated carbons[J].Applied Catalysis A General,2012,421:142-147.
[18]Liu Y J,Qu Y F,Guo J X,et al.Thermal regeneration of manganese supported on activated carbons treated by HNO3for desulfurization[J].Energy&Fuels,2015,29(3):1931-1940.
[19]Mochida I,Korai Y,Shirahama M,et al.Removal of SOx and NOxover activated carbon fibers[J].Carbon,2013,38(2):227-239.
[20]高继贤,王铁峰,王光润,等.烟气水蒸汽含量对变温吸附烟气脱硫过程的影响[J].过程工程学报,2009,9(1):18-22.