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KOH活化花生壳生物质炭对亚甲基蓝吸附性能研究.docx

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第8卷第11期环境工程学报Vol.8,No.112014年11月ChineseJournalofEnvironmentalEngineeringNov . 2 0 14KOH活化花生壳生物质炭对亚甲基蓝吸附性能研究储磊1刘少敏1陈天明2韩香云2严金龙2*丁成2(1.安徽理工大学地球与环境学院,淮南232001;2.盐城工学院环境工程与环境学院,盐城224051)摘要以花生壳生物质炭(P-BC)为原料,KOH为活化剂,采用化学活化法制得活化生物质炭(K-BC),通过考察对亚甲基蓝的吸附性能,研究了花生壳生物质炭的最佳活化条件,并利用N2吸附-脱附实验、SEM等对最佳活化条件下的生 物质炭进行表征。结果表明,K-BC活化的最佳条件为碱炭比为1.5∶1,活化温度为800℃,活化时间为90min,此时K-BC的 比表面积达到597.93m2/g,总孔容达到0.76cm3/g。并考察了亚甲基蓝初始浓度、pH等对K-BC吸附亚甲基蓝的影响,随着初始浓度的增加,吸附平衡时间显著延长,亚甲基蓝去除率显著降低;当pH=6时,K-BC对亚甲基蓝的吸附量最大;K-BC对亚甲基蓝的吸附动力学曲线符合伪二阶动力学模型,吸附平衡时K-BC对亚甲基蓝的吸附能力为80~149.95mg/g。关键词 花生壳炭 亚甲基蓝 动力学中图分类号X703文献标识码A文章编号 1673-9108(2014)11-4737-06Adsorption of methylene blue by peanut shellbio-charwith KOHactivatedChuLei1LiuShaomin1ChenTianming2HanXiangyun2YanJinlong2DingCheng2(1.SchoolofEarthandEnvironment,AnhuiUniversityofScienceandTechnology,Huainan232001,China; 2.SchoolofEnvironmentalScienceandEngineering,YanchengInstituteofTechnology,Yancheng224051,China)AbstractTheactivationbio-char(K-BC)waspreparedbypeanutshellbio-charwithKOHactivated.Thebestactivationconditionswerestudiedbytestingtheadsorptivecapacityofmethyleneblue.ThecharacterandporestructureoftheK-BCwerecharacterizedwithN2adsorption-desorption,SEMandsoon.Theconsiderablepreparationconditionswereobtainedasfollows:impregnationratioof1.5∶1,activationtemperatureof800℃, andanactivationtimeof90min.TheBETsurfaceareaofK-BCwas597.93m2/g,anditstotalporevolumewas0.76cm3/g.TheeffectsofpHandtheinitialconcentrationontheK-BCremovalofmethylenewerestudied.Theresultsshowedthattheremovalofmethylenebluesignificantlydecreasedwithincreasinginitialconcentrationofmethyleneblue,andtheadsorptiontimeincreasedwithK-BCadsorption.WhenthepHwas6,theK-BCad-sorptionmethylenebluecapabilitywasthebest.AndthekineticcurvesofK-BCadsorbedmethylenebluewerefittedwithPseudo-second-orderkineticmodel,theadsorptioncapacitywas80~149.95mg/g.Keywordspeanutshellcarbon;methyleneblue;dynamics随着我国染料工业的快速发展,染料废水的排放也逐渐增多。染料废水不仅有特定的颜色,而且结构复杂,所以染料废水的处理已成为当前水处理研究的重点。染料废水处理方法有电化学、吸附法和生物法等[1-4]。生物法运行成本低,但占地面积单,是一种常用的吸
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