共查询到19条相似文献,搜索用时 78 毫秒
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本文以椰壳制粉末活性炭(AC)为基料,聚乙烯(PE)为高分子粘结剂,采用热压烧结工艺制备烧结活性炭(SinteredActivated Carbon,SAC)。考察了原料质量组成比、热压时间和热压温度对SAC的密度、强度、微观结构的影响,原料的质量比对SAC的机械性能和吸附性能影响最大,随着粉末活性炭添加量的增加,SAC的比表面积迅速增加,而机械强度却降低,并得到了较佳的制备工艺为:原料比为3:1,热压温度150℃,压力为15 MPa,热处理时间30 min。同时通过对比原料AC和SAC对亚甲基蓝吸附行为及N2吸(脱)附曲线的测定,可知制备所得SAC的吸附行为与AC相似,可知PE作为制备烧结活性炭的一种新型粘结剂,在不过多地降低比表面积的前提下,大大地提高烧结活性炭的机械性能,使其能够长时间经受住水流和气流的冲击。 相似文献
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以丝瓜络为原料,ZnCl2为活化剂制备了丝瓜络基活性炭(LAC)。利用扫描电子显微镜(SEM)、比表面积及孔径测定仪对LAC进行表征,LAC对亚甲基蓝的吸附性能采用分光光度计进行测试。结果表明:LAC具有高的比表面积和丰富的孔结构(孔洞以微孔为主);随着炭化活化温度的升高,比表面积和孔体积增大,微孔比例下降;当炭化活化温度为900℃时,LAC的比表面积高达2 333 m2/g,孔体积为1.658 cm3/g;LAC对亚甲基蓝具有较快的吸附速率,在5 min内达到吸附平衡,吸附率高达99%以上。 相似文献
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黄麻纤维活性炭对亚甲基蓝和甲基橙溶液的吸附性能研究 总被引:1,自引:0,他引:1
以黄麻纤维为原料,采用磷酸活化法制得黄麻纤维活性炭作为吸附剂,以纺织印染加工中较为常用的亚甲基蓝(MB)和甲基橙(MO)染料溶液为吸附质,研究染料溶液初始浓度、活性炭投加量、吸附时间等因素对黄麻纤维活性炭吸附性能的影响.结果表明:随着染料溶液初始浓度的增加,两种染料的去除率逐渐降低,吸附量逐渐增大;随着活性炭投加量的增加和吸附时间的延长,两种染料的去除率和吸附量均呈现逐渐增大的变化规律;水浴温度对两种染料的去除率和吸附量影响都较小;染料溶液pH值对两种染料吸附性能的影响存在较大差异,MB的去除率和吸附量随染料溶液pH值增加而增大,而MO的去除率和吸附量随之减小. 相似文献
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用氮气吸附法、扫描电镜对4种不同活性炭(木质活性炭AC1、AC2,煤质活性炭AC3,椰壳质活性炭AC4)的孔隙结构进行表征,通过抄纸方法制备活性炭过滤纸,用亚甲基蓝和苯酚吸附效率表征活性炭过滤纸的吸附性能,研究了活性炭孔隙结构对过滤纸吸附性能的影响.结果表明,两种木质活性炭的比表面积和总的孔容积较高,分别为1054 m2/g、1.165 cm3/g和1125 m2/g、1.083 cm3/g;4种活性炭微孔平均孔径相差不大,但两种木质活性炭的大中孔平均孔径较大;其中,木质活性炭AC2的微孔和大中孔孔容积均较大,孔径在0.64、1.2和2.3 nm附近的孔隙发达,具有较强的选择性吸收能力,用其抄造的过滤纸对亚甲基蓝和苯酚均有较好的吸附效率,3次过滤吸附效率分别为92.2%和93.8%. 相似文献
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改性活性炭对氨气吸附性能的研究 总被引:1,自引:0,他引:1
采用Bothem滴定法及动态吸附法对柠檬酸、NaOH溶液处理活性炭后其表面化学特征及吸附氨气性能进行了研究.结果表明,柠檬酸、NaOH溶液处理的活性炭有效地增加了表面羧基、酚羟基及内酯基含量,提高活性炭的表面亲水性及表面总酸度,而活性炭吸附氨气穿透时间与其表面酚羟基、内酯基和羧基的总含量呈正比关系.而且,40%柠檬酸溶液处理与45% NaOH溶液处理后活性炭吸附氨气穿透时间分别增长2倍及5倍. 相似文献
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负载氧化物的羊毛活性炭对模拟染料废水吸附效果 总被引:1,自引:0,他引:1
为提升羊毛活性炭的吸附脱色能力,利用Fe(NO3)3、Cu(NO3)2作浸渍液制备了负载不同种类金属氧化物的羊毛活性炭,借助扫描电子显微镜、透射电子显微镜、X射线衍射及比表面积实验表征负载金属氧化物羊毛活性炭的负载效果,利用紫外分光光度计分析羊毛活性炭负载氧化物对模拟染料废水的吸附特性,然后探索分析负载工艺对负载铁氧化物羊毛活性炭吸附性能的影响规律。研究结果表明:羊毛负载氧化铁和氧化铜活性炭能很好地提升羊毛活性炭的吸附脱色效果,羊毛活性炭负载铁氧化物比负载铜氧化物的吸附脱色效果好;浸渍液Fe(NO3)3浓度为0.2~0.25 mol/L,负载煅烧时间为2 h,煅烧温度为400℃时,负载铁氧化物羊毛活性炭的吸附脱色率最好。 相似文献
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This work presents a new adsorption technique where the adsorbent (powdered activated carbon-PAC) is in the form of suspended flocs formed with water-soluble polymer flocculants. Thus, the adsorption of a typical dye, methylene blue (MB), was studied onto polyacrylamide flocs of PAC (PACF) in a fluidized bed reactor. The technique is based on the fact that the adsorption capacity of PAC does not decrease after flocculation because the adsorbed polymer occupies only a few surface sites, in the form of trains, loops, and tails. Moreover, the adsorption was found to proceed through a rapid mass transfer of MB to the adsorbing PAC flocs, in the same extent as onto PAC. Because of the rapid settling characteristics of the aggregates formed, the two phase separations, loaded PAC and solution, become easier. Thus, the technique offers the advantages of conducting simultaneously both adsorption and solid/liquid separation all in one single stage. Results obtained showed that high MB removal values can be attained in a fluidized bed reactor (>90%) and that PACF presents a much higher adsorption capacity (breakthrough points) than granulated activated carbon (GAC) in the same adsorbing bed. It is believed that this technique highly broadens the potential of the use of powdered activated carbon or other similar ultrafine adsorbents. 相似文献
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以日常生活中废旧棉织物(WCF)为原料,采用氯化锌法活化制备了废旧棉织物活性炭(AC-WCF),考察了氯化锌质量分数ω、氯化锌浸渍时间t1、活化温度T和活化时间t2四个因素对AC-WCF吸附性能的影响。采用比表面积及微孔/中孔分析仪、扫描电镜(SEM)和红外光谱仪(FT-IR)对AC-WCF样品进行表征。结果表明,AC-WCF各项吸附性能良好,最佳制备工艺为:ω=45%,t1=16 h,T=700℃,t2=30 min,该条件下制备的AC-WCF的BET比表面积高达1462 m2/g,总孔容积0.78 cm3/g,平均孔径2.1 nm,碘吸附值(QI2)1193.8 mg/g,亚甲基蓝吸附值(QMB)25 ml/0.1g,苯酚吸附值(QPhOH)160.7 mg/g,且对模拟染料废水具有良好脱色效果。 相似文献
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Diana Regazzi ZuimDanielle Carpiné Guilherme Augusto Retali DistlerAgnes de Paula Scheer Luciana Igarashi-MafraMarcos Rogério Mafra 《Journal of food engineering》2011,104(2):284-292
Soluble coffee production requires several processes that cause the loss and degradation of aromas, which reduces the quality of the final product. However, such aromas can be recovered into aqueous solution during the production process. Aromas must be separated from water, and pleasant compounds, such as benzaldehyde, must be separated from unpleasant compounds, such as acetic acid. In this study, the kinetic and thermodynamic parameters of benzaldehyde and acetic acid adsorption from synthetic single-solute aqueous systems onto commercial grade granular activated carbon derived from coconut husks were investigated. The contact time required to attain adsorption equilibrium of benzaldehyde was 6 h, while that of acetic acid was 10 h. Adsorption isotherm data revealed that the adsorption of benzaldehyde and acetic acid was exothermic and spontaneous in nature. Moreover, the isosteric heat of adsorption indicated that the adsorbent surface was energetically heterogeneous. The adsorption equilibrium was fitted according to Langmuir, Freundlich and Temkin isotherms. 相似文献
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为研究以废旧织物为原料制备活性炭对亚甲基蓝的吸附性能及其吸附机制,以日常生活中废旧棉织物、黄麻织物和棉/亚麻混纺织物为原料,通过氮气将水蒸气送入高温管式炉进行活化制备活性炭材料,工艺条件为:活化温度750 ℃,活化时间50 min,水蒸气载体流速240 L/h。通过分析活性炭的氮气吸附等温线,并利用BET 法计算活性炭的比表面积,用BJH 方程表征了活性炭的孔结构,同时重点考察了3 种活性炭样品对亚甲基蓝的吸附动力学。结果表明,棉、黄麻和棉/亚麻混纺3 种原料活性炭样品的比表面积分别为703.05、719.93、648.25 m²/g,亚甲基蓝饱和吸附量分别为341.49、267.13和242.68mg/g,而且3 种活性炭样品均更符合准二级动力学方程。 相似文献