以三嵌段共聚物F108为模板剂，苯酚／甲醛为碳源，在中性条件下制备了平均孔径为3．14 nm，最可几孔径分布为3 nm和8 nm，BET比表面积为1541 m2·g－1，孔容为1．01 cm3·g－1的双孔分布介孔碳．通过静态实验法测定了介孔碳对亚甲基蓝的吸附特性，分析了初始浓度、溶液pH、温度对吸附量的影响，并从热力学及动力学角度探讨了介孔碳对亚甲基蓝的吸附机理．结果表明，溶液初始浓度、溶液pH以及温度对吸附量有较大的影响，介孔碳对亚甲基蓝的吸附随着初始浓度、pH、温度的上升而增大，吸附为吸热反应，提高温度有利于吸附的进行．实验制备的介孔碳对亚甲基蓝的最大吸附量为421 mg·g－1，相比于普通活性炭，双孔分布介孔碳对亚甲基蓝显示了更优的吸附性能．亚甲基蓝在介孔碳上的吸附行为符合Langmuir吸附等温线和Elovich动力学模型．计算得到的吸附吉布斯自由能（ΔG0）＜0，吸附标准焓变（ΔH0）＞70 kJ·mol－1，说明亚甲基蓝在介孔碳上的吸附是自发进行的单分子层吸热反应，且化学反应在吸附过程中发挥了重要作用．
Mesoporous carbon of diplopore distribution with the mean pore size of 3.14 nm, the most probable pore size distribution of 3 nm and 8 nm, BET surface area of 1541 m2·g-1 , pore volume of 1.01 cm3·g-1 was synthesized under neutral conditions by use of triblock copolymers F108 as template agent and phenol / formaldehyde as carbon source. The adsorption characteristic of methylene blue on the mesoporous carbon was investigated by conducting a series of batch adsorption experiments. The influence of solution pH, initial concentration and temperature was examined. The adsorption mechanism was investigated from kinetics and thermodynamic point of view. The results showed that the adsorption depended on the initial concentration, pH value and temperature. The adsorption amount increased with the increase of initial concentration, pH value, and temperature. The adsorption was an endothermic reaction, and high temperature was conducive to the adsorption. The maximum adsorption capacity of methylene blue on the mesoporous carbon was 421 mg·g-1 . Compared to ordinary carbon, mesoporous carbon of diplopore distribution showed better adsorption performance for methylene blue. The adsorption behavior of methylene blue on mesoporous carbon conformed to the Langmuir isotherm and Elovich dynamics model. The Gibbs free energy of adsorption (ΔG0 )<0, adsorption standard enthalpy (ΔH0 )>70 kJ·mol-1 , indicated that the adsorption was spontaneous endothermic reaction of single molecule layer, and the chemical reaction played an important role in the adsorption process.
参考文献
| [1] | 林俊雄.硅藻土基吸附剂的试制备、表征及其染料吸附特性研究[D].杭州:浙江大学博士学位论文,2007 |
| [2] | 周娟娟,胡中华,刘亚菲,尹燕娥,唐文伟.生物活性炭纤维的制备及其水处理[J].新型炭材料,2006(01):64-69. |
| [3] | Liu Q S, Zheng T, Wang P, et al. Adsorption isotherm, kinetic and mechanism studies of some substituted phenols on activated carbon fibers[J]. Chemical Engineering Journal, 2010, 157(2/3):348-356 |
| [4] | Castro-Muniz A, Suarez-Garcia F, Martinez-Alonso A, et al. Activated carbon fibers with a high content of surface functional groups by phosphoric acid activation of PPTA[J]. Journal of Colloid And Interface Science, 2011, 361 (1):307-315 |
| [5] | Tutem E, Apak R, Unal C F. Adsorptive removal of chlorophenols from water by bituminous shale[J]. Water Research, 1998, 32(8):2315-2324 |
| [6] | Geng X P. Study on the fractions of thermodynamic function changes for both adsorption and desorption from a liquid-solid system[J]. The mochimica Acta, 1998, 308(12):131-138 |
| [7] | Fu P, Hu S, Xiang J, et al. Pyrolysis of maize stalk on the characterization of chars formed under different devolatilization conditions[J]. Energy and Fuels, 2009, 23(9):4605-4611 |
| [8] | 杨蕴哲.活性黑KN-B染料模拟废水电化学脱色[J].环境工程学报,2009(09):1607-1610. |
| [9] | 徐如人,庞文琴,于吉红.分子筛与多孔材料化学[M].北京:科学出版社, 2004, 9(2):528-523 |
| [10] | Zhuang X, Wan Y, Feng C M, et al. Highly efficient adsorption of bulky dye molecules in wastewater on ordered mesoporous carbons[J]. Chem Mater, 2009, 21(4):706-716 |
| [11] | Yuan X, Xing W, Zhu S P, et al. Adsorption of bulky molecules of nonylphenol ethoxylate on ordered mesoporous carbons[J]. Colloid and Interface Science, 2008, 322(2):558-565 |
| [12] | Qin Q D, Ma J, Liu K. Adsorption of anionic dyes on ammonium functionalized MCM-41[J]. Journal of Hazardous Materials, 2009, 162 (1):133-139 |
| [13] | Yan Y, Zhang F, Meng Y, et al. One-step synthesis of ordered mesoporous carbonaceous spheres by an aerosol-assisted self-assembly[J]. Chem Commun, 2007(27):2867-2869 |
| [14] | Zhao D Y, Feng J L, Huo Q S, et al. Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores[J]. Science, 1998, 279(5350):548-552 |
| [15] | Ryoo R, Joo S H, Jun S. Synthesis of highly ordered carbon molecular sieves via templante mediated structural transformation[J]. Journal of Physical Chemistry B, 1999, 103(37):7743-7746 |
| [16] | Lee H I, Kim J H, You D J, et al. Rational synthesis pathway for ordered mesoporous carbon with controllable 30 to 100 angstrom pores[J]. Advanced Materials, 2008, 20(4):757-762 |
| [17] | Joo S H, Lee H I, You D J, et al. Ordered mesoporous carbons with controlled particle size as catalyst supports for direct methanol fuel cell cathodes[J]. Carbon, 2008, 46(15):2034-2045 |
| [18] | Meng Y, Gu D, Zhang F, et al. Ordered mesoporous polymers and homologous carbon frameworks:Amphiphilic surfactant templating and direct transformation[J]. Chemical Engineering Journal, 2005, 18(3):44-48 |
| [19] | Li K Q, Zheng Z, Feng J W, et al. Adsorption of p-nitroaniline from aqueous solution onto activated carbon fiber prepared from cotton stalk[J]. Hazard Mater, 2009, 166(8):1180-1185 |
| [20] | Freundlich H M F. Over the adsorption in solution[J]. Journal of Physical Chemistry, 2006, 57(3):385-471 |
| [21] | Kannan N, Sundaram M M. Kinetics and mechanisn of removal of methy lene blue by adsorption on various carbons comparative study[J]. Dyes pigments, 2001, 51(1):25-40 |
| [22] | Senth Lumaar S, Varadarajan P R, Porkod I K, et al. Adsorption of methy lene blue onto jute fiber carbon kinetics and equilbrium studies[J]. Colloid Interface Science, 2005, 284(1):78-82 |
| [23] | 李勤,黄亚继,金保昇,等.生物质活性炭对亚甲基蓝的吸附平衡和动力学研究[J].热力学工程, 2010, 25(4):452-453 |
| [24] | 贾佳祺,李坤权,张雨轩,乔小朵.磷酸微波活化多孔生物质炭对亚甲基蓝的吸附特性[J].环境工程学报,2014(01):92-97. |
| [25] | Contescu A, Vass M, Contescu C, et al. Acid buffering capacity of basic carbons revealed by their continuous pK distribution[J]. Carbon, 1998, 36(3):247-258 |
| [26] | 戴闽光,林清清,阙凯文.活性炭的Zeta电位对各种染料吸附影响[J].林产化学与工业, 1994, 14(2):25-26 |
| [27] | 任广军,翟玉春,宋恩军,张春丽,王昕.无机-有机柱撑膨润土对水中苯胺的吸附行为研究[J].硅酸盐学报,2004(08):988-991. |
| [28] | Yue Q Y, Li Q, Gao B Y, et al. Formation and characteristics of cationic-polymer/bentonite complexes as adsorbents for dyes[J]. Applied Clay Science, 2007, 35(4):268-275 |
| [29] | Al-Rashed S M, Al-Gaid A A. Kinetic and thermodynamic studies on the adsorption behavior of rhodamine B dye on duolite C-20 resin[J]. Journal of Saudi Chemical Society, 2012, 16(2):209-215 |
| [30] | Arivoli S, Thenkuzhali M. Kinetic, mechanistic, thermodynamic and equilibrium studies on the adsorption of rhodamine B by acid activated low cost carbon[J]. E-Journal of Chemistry, 2008, 5(2):187-200 |
| [31] | Cheung C W, Porter J F, Mckay G. Sorption kinetics for the removal of copper and zince from effluents using bone char[J]. Separation and Purification Technology, 2000, 19(1):55-64 |
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