碳纳米管吸附腐植酸的动力学、热力学及机理研究

doi:10.3724/SP.J.1077.2011.00170

无机材料学报 ›› 2011, Vol. 26 ›› Issue (2): 170-174.DOI: 10.3724/SP.J.1077.2011.00170 CSTR: 32189.14.SP.J.1077.2011.00170

碳纳米管吸附腐植酸的动力学、热力学及机理研究

朱志平¹,², 黄可龙¹, 周艺²

1.中南大学化学与化工学院, 长沙410086; 2. 长沙理工大学化学与生物工程学院, 长沙410114

收稿日期:2010-05-06 修回日期:2010-09-05 出版日期:2011-02-20 网络出版日期:2011-01-21
作者简介:朱志平(1963-), 男, 硕士, 教授. E-mail:zzp8389@163.com
基金资助:
国家自然科学基金(20976016);湖南省自然科学基金(09JJ6067)

Study on Kinetics, Thermodynamics and Mechanism for Carbon Nanotubes Adsorbing Humic Acid

ZHU Zhi-PING^1,2, HUANG Ke-Long¹, ZHOUYi ²

1. College of Chemistry and Chemical Engineering, Central SouthUniversity, Changsha 410082, China; 2. College of Chemical and biological Engineering,Changsha University of Science & Technology, Changsha 410114, China

Received:2010-05-06 Revised:2010-09-05 Published:2011-02-20 Online:2011-01-21
Supported by:
National Nature Science Foundation of China (20976019); Nature Science Foundation of Hunan Province (09JJ6067)

摘要/Abstract

摘要： 针对天然水中腐植酸(HA)类溶解性有机物去除问题, 采用多壁碳纳米管为吸附剂, 在不同的pH值、吸附剂量、初始HA浓度下进行吸附动力学实验, 用准二级速率方程拟合了动力学数据, 其线性相关度在0.99以上, 拟合得到的平衡吸附量为27mg/g,与实验结果(25.5 mg/g)基本一致. 在25~50℃下进行了碳纳米管吸附腐植酸的等温吸附实验, 以Langmuir模型拟合的平衡吸附量为29.7mg/g, 与实验结果相近. 用Clapeyron-Clausius与Gibbs- Helmholtz方程计算的自由能(Δ G)、焓(Δ H)、熵(Δ S)皆为负值, 说明碳纳米管对腐植酸的吸附为放热熵减过程. 碳纳米管的表面、管间隙、管内腔及管束之间形成的束聚孔为其有效吸附点位, 腐植酸与碳纳米管间的π-π作用也是吸附的主要原因之一.

关键词: 碳纳米管, 腐植酸, 吸附, 动力学, 热力学

Abstract: The dissolved organic carbon in natural water was mainly from soluble humicacid(HA) which had much harms in industrial and drinkablewater. As a new adsorbent, the multi-walled carbon nanotubes (MCNTs) were used toremove HA at different pH value, different MCNTs dosages and different HA initialconcentration, a series of experiments including batch adsorption, adsorptionisotherm were carried. The adsorption kinetics data was fittedwith pseudo-second-order rate model, their linear correlations was above 0.99,and equilibrium adsorptioncapacity obtained from fitting curve was 27mg/g, consistent with theexperimental results (25.5mg/g). The adsorption isotherm test was carried at 25℃-50℃, the equilibrium adsorptioncapacity was 29.7mg/g by Langmuir model, which was similar to theexperiment results. The free energy (Δ<>G), enthalpy(Δ<>H) and entropy(Δ<>S) were obtanined with Clapeyron-Clausius and Gibbs-Helmholtz equationin the adsorption isotherm, which all were negative, indicated that HA adsorbedby MCNT was an exothermic process of entropy reduction. MCNT’s outer surfaces,layer interspace,inner cavity and aggregated pores became efficient adsorption space for HA. Theπ-π interactionsbetween HA and MCNT played an important role in the adsorption process.

Key words: multi-walled carbon nanotubes (MCNT), humic acid (HA), adsorption, kinetics, thermodynamics

中图分类号:

TQ174

朱志平, 黄可龙, 周艺. 碳纳米管吸附腐植酸的动力学、热力学及机理研究[J]. 无机材料学报, 2011, 26(2): 170-174.

ZHU Zhi-PING, HUANG Ke-Long, ZHOUYi. Study on Kinetics, Thermodynamics and Mechanism for Carbon Nanotubes Adsorbing Humic Acid[J]. Journal of Inorganic Materials, 2011, 26(2): 170-174.

参考文献

[1] Chin Yu-p, Ailen G, O’Loughlin E. Molecular weight, polydispersity and spectroscopic properities of aquatic humic substances. Environmental Science & Technology, 1994, 28(11): 1852-1858.

[2] Thurman E M, Wershaw R L, Malcolm R L, et al. Molecular size of aquatic humic substances. Organic Geochemistry, 1982, 4(1): 27-35.

[3] Long R Q, Yang R T. Carbon nanotubes as superior sorbent for dioxin removal. Journal of the American Chemical Society, 2001, 123(9): 2058-2059.

[4] Yang K, Wang X L, Zhu L Z, et al. Competitive sorption of pyrene, phenanthrene, and aphthalene on multiwalled carbon nanotubes. Environmental Science & Technology, 2006b, 40(18): 5804-5810.

[5] Yan X M, Shi B Y, Lu J J, et al. Adsorption and desorption of atrazine on carbon nanotubes. Journal of Colloid and Interface Science, 2008, 321(1): 30-38.

[6] Peng X J, Li Y H, Luan Z K, et al. Adsorption of 1,2-dichlorobenzene from water to carbon nanotubes. Chemical Physics Letters, 2003, 376(1/2): 154-158.

[7] Lu C, Chung Y L, Chang K F. Adsorption thermodynamic and kinetic studies of trihalomethanes on multiwalled carbin nanotubes. Journal of Hazardous Materials, 2006, 138(2): 304-310.

[8] W u F C, Tseng R L, Hu C C. Comparisons of pore p roperties and adsorp tion performance of KOH-activated and steam-activated carbons. Microporous and Mesoporous Materials, 2005, 80(1/2/3): 95-106.

[9] Ho Y S, McKay G. Pseudo-second order model for sorption processes. Process Biochemistry, 1999, 34(5): 451-465.

[10] Ho Y S, M ckay G. Kinetic models for the sorption of dye from aqueous solutions by wood. Transactions of the Institution of Chemical Engineers, 1998, 76(2): 183-191.

[11] Benny T H, Bandosz T J, Wong S S. Effect of ozonolysis on the pore structure, surface chemistry, and bundling of single walled carbon nanotubes. J. Colloid Interface Sci., 2008, 317(2): 375-382.

[1]	苗鑫, 闫世强, 韦金豆, 吴超, 樊文浩, 陈少平. Te基热电器件反常界面层生长行为及界面稳定性研究[J]. 无机材料学报, 2024, 39(8): 903-910.
[2]	李红兰, 张俊苗, 宋二红, 杨兴林. Mo/S共掺杂的石墨烯用于合成氨: 密度泛函理论研究[J]. 无机材料学报, 2024, 39(5): 561-568.
[3]	吴光宇, 舒松, 张洪伟, 李建军. 接枝内酯基活性炭增强苯乙烯吸附性能研究[J]. 无机材料学报, 2024, 39(4): 390-398.
[4]	谢天, 宋二红. 弹性应变对C、H、O在过渡金属氧化物表面吸附的影响[J]. 无机材料学报, 2024, 39(11): 1292-1300.
[5]	马永杰, 刘永胜, 关康, 曾庆丰. CH₄+C₂H₅OH+Ar体系热解的气相动力学研究[J]. 无机材料学报, 2024, 39(11): 1235-1244.
[6]	晁少飞, 薛艳辉, 吴琼, 伍复发, MUHAMMAD Sufyan Javed, 张伟. MXene异质结Ti-O-H-O电子快速通道促进高效率储钾[J]. 无机材料学报, 2024, 39(11): 1212-1220.
[7]	何倩, 唐婉兰, 韩秉锟, 魏佳元, 吕文轩, 唐昭敏. pH响应铜掺杂介孔硅纳米催化剂增强肿瘤化疗-化学动力学联合治疗的研究[J]. 无机材料学报, 2024, 39(1): 90-98.
[8]	陈海燕, 唐志鹏, 尹良君, 张林博, 徐鑫. CIPs@Mn_0.8Zn_0.2Fe₂O₄-CNTs复合材料低频吸波性能研究[J]. 无机材料学报, 2024, 39(1): 71-80.
[9]	马晓森, 张丽晨, 刘砚超, 汪全华, 郑家军, 李瑞丰. 13X@SiO₂合成及其甲苯吸附性能[J]. 无机材料学报, 2023, 38(5): 537-543.
[10]	郭春霞, 陈伟东, 闫淑芳, 赵学平, 杨傲, 马文. 埃洛石纳米管负载锆氧化物吸附水中砷的研究[J]. 无机材料学报, 2023, 38(5): 529-536.
[11]	王世怡, 冯爱虎, 李晓燕, 于云. Fe₃O₄负载Ti₃C₂T_x对Pb(II)的吸附性能研究[J]. 无机材料学报, 2023, 38(5): 521-528.
[12]	于业帆, 徐玲, 倪忠斌, 施冬健, 陈明清. 普鲁士蓝/生物炭材料的制备及其氨氮吸附机理[J]. 无机材料学报, 2023, 38(2): 205-212.
[13]	凌洁, 周安宁, 王文珍, 贾忻宇, 马梦丹. Cu/Mg比对Cu/Mg-MOF-74的CO₂吸附性能的影响[J]. 无机材料学报, 2023, 38(12): 1379-1386.
[14]	汤亚, 孙盛睿, 樊佳, 杨庆峰, 董满江, 寇佳慧, 刘阳桥. 粉煤灰衍生水合硅酸钙PEI改性及吸附去除Cu(II)与催化降解有机污染物[J]. 无机材料学报, 2023, 38(11): 1281-1291.
[15]	田煜彬, 田超凡, 李森, 赵永鑫, 邢涛, 李智, 陈萧如, 向帅蓉, 代鹏程. 高导电性生物质碳布的制备及其燃料电池气体扩散层性能[J]. 无机材料学报, 2023, 38(11): 1316-1322.

碳纳米管吸附腐植酸的动力学、热力学及机理研究

Study on Kinetics, Thermodynamics and Mechanism for Carbon Nanotubes Adsorbing Humic Acid

PDF (PC)

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价