不同结构活性炭对CO_2、CH_4、N_2及O_2的吸附分离性能

制备了比表面积为1943 m2/g的纯微孔活性炭AC-1和比表面积为1567 m2/g,中孔比例为47.18%的活性炭AC-2.分别以AC-1及AC-2为吸附剂测定CO2、CH4、N2和O2的298 K吸附等温线,考察了两种活性炭对CO2/N2、CO2/CH4及CH4/N2气体混合物的吸附分离性能.实验结果表明,孔结构是影响吸附剂吸附分离性能的主要因素.富中孔活性炭AC-2较AC-1更适用于CO2/N2、CO2/CH4气体混和物的吸附分离,而微孔活性炭AC-1对CH4/N2混合体系的吸附分离性能优于AC-2.     

CH_4/N_2吸附分离技术中吸附材料的研究进展

近年来我国开采煤层气的步伐加快,而利用率低,其原因在于甲烷含量低和燃料效率低等。因此有效地富集提纯煤层气,开发高效的CH_4/N_2分离技术就显得尤为关键。相比较传统的分离技术,高效、经济的PSA吸附分离技术在CH_4/N_2中展示出广阔的前景。通过分析国内外传统吸附材料和新型吸附材料的研究现状,对其各自的吸附机理、吸附工艺进行探讨,为以后高效CH_4/N_2分离材料的开发和研究提供了新的参考依据,同时展望吸附分离技术在CH_4/N_2分离领域的发展与应用前景。     

氮气和氧气在碳分子筛上的吸附相平衡研究

用双柱定容容量法测定了氮气和氧气在碳分子筛上温度分别为25、30、35、40及45℃时的吸附等温线,平衡压力最高达到1 Mp,等温线用Langmuir方程拟合能得到良好的实验结果,并求出了氮气和氧气在这两种吸附剂上的吸附热。     

花生壳活性炭对Cu~(2+)的吸附性能研究

以花生壳为原料,磷酸为活化剂制备花生壳活性炭,采用高分辨电子扫描电镜(SEM)对花生壳活性炭进行了表征。从热力学和动力学的角度,研究了花生壳活性炭对Cu2+的吸附行为。热力学研究表明:花生壳活性炭对Cu2+的吸附符合Langmuir等温吸附方程,该吸附是自发吸热过程。动力学研究表明:花生壳活性炭对Cu2+的吸附符合二级反应动力学方程反应特征,颗粒内扩散为主要控速步骤。     

用氮气吸附研究活性炭纤维的分维

３种比表面积不同的粘胶基活性炭纤维（ＡＣＦ）在７７Ｋ进行氮气吸附,得到了比表面积、微孔容积和孔径分布,并用等温吸附数据分析了ＡＣＦ的分维。研究结果表明：氮气多吸附早期和高度覆盖时得到的分维有所不同,但是其趋势基本一致,前者得到的结果更为合理,分维与比表面积、微孔容积没有直接的对应关系,而与Ｈ－Ｋ孔径分布以及特征吸附能较为一致,反映了小微孔含量的多少。     

污泥活性炭对罗丹明的吸附性能研究

以污水厂的剩余污泥为原料,采用化学活化法制备污泥活性炭,全面研究了吸附时间、pH、温度和离子强度对污泥活性炭吸附罗丹明效果的影响,确定了三种温度下(25℃、35℃、45℃)的吸附等温模型和吸附动力学模型。结果表明:最佳吸附时间为25 h,此时吸附率达96.56%;35℃时吸附率效果最佳;碱性条件下吸附效果较好;离子强度对于吸附行为影响不大。其吸附规律可用Freundlich模型描述,其动力学参数符合伪二级动力学模型。     

活性炭纤维对水溶液中醋酸丁酯的吸附性能研究

研究了以活性炭纤维为吸附剂从水溶液中吸附醋酸丁酯的吸附静力学、动力学规律及动态吸附特性。实验表明，活性炭纤维对醋酸丁酯的吸附量较大，吸附速度快，动态吸附、脱附性能好。该方法可行，具有一定的实用价值。     

活性炭纤维对水溶液中醋酸丁酯的吸附性能研究

研究了以活性炭纤维为吸附剂从水溶液中吸附醋酸丁酯的吸附静力学，动力学规律及动态吸附特性。实验表明，活性炭纤维对醋酸丁酯的吸附量较大，吸附速度快，动态吸附，脱际性能好。     

过滤嘴中活性炭吸附性能的研究

介绍香烟过滤嘴活性炭对烟雾组分吸附的效果,及自制活性炭与国外滤嘴炭吸附性能的比较。     

表面改性活性炭对饮用水中THMs吸附性能研究

通过对活性炭的表面改性，并对氯化消毒后的高色度水进行吸附处理，可使其三氯甲烷（THMs)的含量降低到44μg/dm^3，达到国家生活饮用水质标准。     

中孔活性碳纤维及其吸附特性

活性碳纤维具有丰富的有效吸附孔,孔径分布窄,吸脱行程短,吸脱速度快,吸附容量大。是,一般活性碳纤维的孔径较小,限制了对大分子的吸附,使其应用受到一定限制,近年来,科学工作者进行了中孔型活性炭纤维的研制,以拓宽其应用领域,本文着重阐述了中孔活性碳纤维的制造方法及其吸附特性。     

Adsorption of SO2 on Activated Carbon for Low Gas Concentrations

Adsorption experiments of SO₂ on activated carbon has been carried out for low concentrations (about 100 ppm) at room temperature (15 to 33 °C) with varying humidity in the air. The breakthrough curves show that at high relative humidity or relative higher SO₂ concentration, the load capacity increases with respect to temperature. The humidity of the air is also of benefit to the load capacity of SO₂. When an adsorption process is interrupted and the activated carbon is kept closed for a while, the SO₂ concentration at the exit of a fixed‐bed adsorber is similar to that of the fresh activated carbon and begins at a very low value. It appears that the sorption potential has been refreshed after the storage period. Analysis of desorption experiments by simultaneous thermal analysis combined with mass spectrometry (MS) after loading, shows that the physisorbed SO₂ and H₂O are desorbed at low temperatures. At higher temperatures, the MS peak of SO₂ and H₂O occur at the same time. Compared with desorption immediately after loading, after one day, the desorption peak due to the physisorbed SO₂ disappears. From this, it can be concluded that the refreshment of the loading capacity of the activated carbon after storage is mainly due to a change in the nature of the SO₂ from a physisorbed state to a chemisorbed form. The same mechanism leads to a continuous refreshment of the sorption potential by means of a chemical reaction during the adsorption process.     

Adsorption of H2, CO2, CH4, CO,N2 and H2O in Activated Carbon and Zeolite for Hydrogen Production

Abstract

The design of a layered pressure swing adsorption unit to treat a specified off-gas stream is based on the properties of the adsorbent materials. In this work we provide adsorption equilibrium and kinetics of the pure gases in a SMR off-gas: H₂O, CO₂, CH₄, CO, N₂, and H₂ on two different adsorbents: activated carbon and zeolite. Data were measured gravimetrically at 303–343 K and 0–7 bar. Water adsorption was only measured in the activated carbon at 303 K and kinetics was evaluated by measuring a breakthrough curve with high relative humidity.     

间苯二酚在活性炭纤维上的吸附与再生研究

研究了间苯二酚水溶液在活性炭纤维上的吸附平衡关系,溶液pH对活性炭纤维吸附性能的影响,间苯二酚在固定床上的吸附动力学和脱附动力学,同时在连续操作条件下研究了吸附间苯二酚后的活性炭纤维碱法再生工艺过程,以及多次再生对活性炭纤维再生效率的影响。     

Study on Adsorption and Diffusion in Zeolite

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苯酚在活性炭上吸附平衡模型的研究

本文研究了苯酚在活性炭上的吸附特性,并发现在低pH,低温度下有利于活性炭吸附苯,研究表明Freundlich模型能较好描述吸附过程,并得到了在考虑温度,pH值影响情况下苯酚的Freundlich模型表达式。     

Adsorption Characteristics of Atrazine on Granulated Activated Carbon and Carbon Nanotubes

Adsorption of atrazine (ATZ) from aqueous solutions by granular activated carbon (GAC) and carbon nanotubes (CNT) was studied in a batch‐mode adsorption system at different initial concentrations of ATZ (1.0–30.0 mg L^–1) and at three temperatures of 288, 296 and 304 K. The adsorption isotherms of Langmuir, Freundlich, Polanyi–Manes, and Brunauer–Emmett–Teller (modified) were used to model the process. The adsorption kinetics followed a pseudo‐second‐order kinetic model. The thermodynamic parameters ΔH⁰, ΔS⁰, and ΔG⁰ of the adsorption were estimated. The thermodynamic parameters indicate that the adsorption process is spontaneous and exothermic.     

活性炭吸附甲基橙模拟废水预测模型研究

分别采用BP人工神经网络算法及多元线性回归法,以实验所得的36组数据为样本,建立了以吸附时间、活性炭投加量及甲基橙废水浓度为输入变量,以活性炭吸附处理后甲基橙溶液的吸光度为输出变量的吸附预测模型,并进行了两模型预测效果的对比。结果表明,BP神经网络模型获得了比多元线性回归更好的拟合预测效果。使用BP神经网络模型可以实现同时考虑三个操作因素条件下活性炭吸附特性的预测,而且预测结果与实验数据吻合度较高,其预测样本最大和最小相对偏差分别为2.92%和0.029%,残差绝对值小于0.050 5。     

Fe2O3/TiO2/Activated Carbon Nanocomposite with Synergistic Effect of Adsorption and Photocatalysis

Fe₂O₃/TiO₂/activated carbon (FT/AC) nanocomposites supported on silica gel beads were synthesized using a sonochemical method and fully characterized. The response surface method was applied to optimize the removal of Pb(II) ions by nanocomposites under visible light. The experiments were conducted by adjusting three parameters, i.e., initial concentration of Pb(II) ions, dosage of Fe₂O₃/TiO₂ (FT) photocatalyst, and pH. The FT/AC nanocomposite showed higher efficiency for Pb(II) ion removal in comparison with FT due to the synergistic effect of activated carbon combined with Fe₂O₃/TiO₂.