Cu、Ag改性活性炭常温脱除低浓度羰基硫性能  

Adsorption of Low Concentration of Carbonyl Sulfide by Cu、Ag Modified Activated Carbon at Ambient Temperature

作　　者：李敏[1] 张智宏[1] 魏燕[1] 

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《精细化工》2016年第4期390-395,共6页Fine Chemicals

基　　金：江苏省产学研前瞻项目(BY2014037-10)~~

摘　　要：采用等体积浸渍法,以硝酸处理后的活性炭(AC-HN)为载体,Ag NO3和Cu(NO3)2为原料制备了Cu/ACHN和Ag/AC-HN吸附剂。研究了浸渍液、焙烧温度、焙烧时间和负载量对吸附剂常温脱除低浓度羰基硫(COS)性能影响,并通过N2物理吸附、FE-SEM、TG-DTG、XRD、FTIR对吸附剂进行了表征。动态吸附结果表明,改性后的吸附剂吸附COS的能力提升。Ag+在AC表面被还原成Ag0。Cu/AC-HN活性组分以Cu2O存在,表现出更佳的吸附能力。Cu(NO3)2改性后,吸附剂比表面积降低,AC原有官能团没有发生变化。焙烧温度对Cu/AC-HN活性组分物相有较大影响。焙烧温度升高,Cu(NO3)2逐渐分解成CuO,CuO被AC还原成Cu2O,350℃时Cu2O的量达到最高。进一步提高温度,Cu2O被还原成Cu0,Cu2O量降低。AC对COS的吸附量为7.5 mg/g。当焙烧温度350℃、焙烧时间1.5 h、铜负载量5%时,Cu/AC-HN吸附COS的效果最好,吸附量达到14.8 mg/g。Two kinds of adsorbents,Cu / AC-HN and Ag / AC-HN,were prepared by using an incipient wetness impregnation method using copper nitrate and silver nitrate as the raw materials and activated carbon treated by nitric acid（AC-HN） as the support.The effects of impregnants,calcination temperature,calcination time and amount of loaded on the adsorption capacity of low concentration of carbonyl sulfide（COS） at ambient temperature were investigated.The adsorbents were characterized by employing N2-physical adsorption,FE-SEM,TG-DTG,XRD and FTIR.Dynamic adsorption experiments results showed that the adsorption capacities of the adsorbents were significantly improved after modified.Silver ions were reduced to Ag0 in the surface of AC.The adsorbent Cu / AC-HN showed a better adsorption capacity and the active sites were existed in the form of Cu2 O.The specific surface areas of the adsorbents were getting down and the functional groups of AC had no change after modified by Cu（NO3）2.The active sites phase of Cu / AC-HN showed high dependent on the calcination temperature in the preparation process.Copper nitrates were decomposed into CuO,then reduced to Cu2 O by AC with the calcination temperature increased and the amount of Cu2 O achieved maximun at350 ℃.Above 350 ℃,Cu2 O were reduced to Cu0 and the active sites were lowered.The adsorption capacity of AC was 7.5 mg / g for removal carbonyl sulfide（COS）,while the adsorption capacity of Cu /AC-HN reached 14.8 mg / g.The optimal preparation conditions were as follows：the calcination temperature and time were 350 ℃ and 1.5 h respectively,and the copper loading amount was 5%.

关 键 词：氧化亚铜 活性炭 羰基硫 吸附 功能材料 

分 类 号：X511[环境科学与工程—环境工程]