合理处理处置农业生产过程中产生的大量固体废弃物,已成为农业和环境领域共同关注的焦点。选取了两种常见的农业固体废弃物甘蔗渣、玉米芯,用批量平衡吸附实验研究其对水中亚甲基蓝染料的吸附作用。吸附动力学结果表明,甘蔗渣和玉米芯对亚甲基蓝的吸附平衡时间小于4 h,吸附动力学过程可用准二级动力学模型精准拟合(R2>0.9),表明化学吸附主导了整个吸附过程;等温吸附曲线为典型的非线性吸附,可用Langmuir 等温吸附模型拟合。结果表明,甘蔗渣和玉米芯对水中亚甲基蓝有较好的吸附去除能力,最大吸附量分别为22.03 和19.72 mg/g。
The proper disposal of massive agricultural solid waste is one of main agricultural and environmental concerns. The bagasse and the corn cob are selected as two typical agricultural solid wastes in this study to investigate the adsorption kinetics and the equilibrium isotherms of the dye methylene blue (MB). It is shown that the adsorption rate is great and the equilibrium is reached in less than 4 h. The sorption kinetics can be well described by a pseudo-second-order kinetic model and is fitted with the R2 value greater than 0.9, indicating a chemisorption dominated process. The adsorption isotherms are non-linear, and can be well fitted by the Langmuir adsorption model. The bagasse and the corn cob show a good sorption capacity with respect to the MB, and the maximum adsorption amount of the MB by the bagasse and the corn cob are 22.03 and 19.72 mg/g, respectively.
[1] Noreen S, Bhatti H N, Nausheen S, et al. Batch and fixed bed adsorption study for the removal of Drimarine Black CL-B dye from aqueous solution using a lignocellulosic waste: A cost affective adsorbent[J]. Industrial Crops and Products, 2013, 50: 568-579.
[2] Akar S T, Ozcan A S, Akar T, et al. Biosorption of a reactive textile dye from aqueous solutions utilizing an agro-waste[J]. Desalination, 2009, 249 (2): 757-761.
[3] Elsherbiny A S. Adsorption kinetics and mechanism of acid dye onto montmorillonite from aqueous solutions: Stopped-flow measurements[J]. Applied Clay Science, 2013, 83-84: 56-62.
[4] 任南琪, 周显娇, 郭婉茜, 等. 染料废水处理技术研究进展[J]. 化工学 报, 2013, 64(1): 84-94. Ren Nanqi, Zhou Xianjiao, Guo Wanqian, et al. Progress of dye waste water treatment technology[J]. CIESC Journal, 2013, 64(1): 84-94.
[5] Mahmoodi N M, Salehi R, Arami M. Binary system dye removal from colored textile wastewater using activated carbon: Kinetic and isotherm studies[J]. Desalination, 2011, 272(1): 187-195.
[6] Ozcan A, Sahin Y, Koparal A S. Carbon sponge as a new cathode material for the electro-Fenton process: Comparison with carbon felt cathode and application to degradation of synthetic dye basic blue 3 in aqueous medium[J]. Journal of Electroanalytical Chemistry, 2008, 616(1/2): 71-78.
[7] Sun S P, Li C J, Sun J H. Decolorization of an azo dye Orange G in aqueous solution by Fenton oxidation process: Effect of system parameters and kinetic study[J]. Journal of Hazardous Material, 2009, 161(2/3): 1052-1057.
[8] Kulla H G, Klausener F, Meyer U. Interference of aromatic sulfo groups in the microbial- degradation of the azo dyes orange- I and orange- II[J]. Archives of Microbiology, 1983, 135(1): 1-7.
[9] Lagergren S. Zur theorie der sogenannten adsorption geloster stoffe[J]. Kungliga Svenska Vetenskapsakademiens Handlingar, 1898, 24(4): 1-39.
[10] Ho Y S. Adsorption of heavy metals from waste streams by peat[D]. Birmingham U K: University of Birmingham, 1995.
[11] Ho Y S, McKay G. Pseudo-second order model for sorption processes[J]. Process Biochemistry, 1999, 34: 451-465.
[12] 崔龙哲, 吴桂萍, 邓克俭. 质子化剩余污泥吸附染料的性能及机理[J]. 化工学报, 2007, 58(5): 1290-1295. Cui Longzhe, Wu Guiping, Deng Kejian. Adsorption performance and mechanism of binding of dye by protonated coke waste[J]. Journal of Cheical Industry and Engineering (China), 2007, 58(5): 1290-1295.
[13] Langmuir I. The constitution and fundamental properties of solids and liquids[J]. Journal of American Chemical Society, 1916, 38(11): 2221- 2295.
[14] Freundlich H M F. Über die adsorption in lösungen[J]. Zeitschrift für Physikalische Chemie, 1906, 57(A): 385-470.
[15] Vimonses V, Lei S, Jin B. Kinetic study and equilibrium isotherm analysis of Congo Red adsorption by clay materials[J]. Chemical Engineering Journal, 2009, 148(2/3): 354-364.(
