阳离子凝胶对十二烷基苯磺酸钠内扩散吸附研究
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摘要
以多官能团单体为原料,由溶液缩聚法合成了阳离子凝胶并将其负载于棉纱制备了凝胶-棉纱复合吸附滤芯。通过静态和动态吸附实验分别研究了凝胶和滤芯对水中阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的吸附行为并探讨了吸附机理。研究表明,吸附作用主要基于凝胶与SDBS间静电引力和氢键作用,吸附过程主要由凝胶内扩散吸附行为主导,其平衡吸附量可达850 mg/g以上。溶液pH和NaCl含量等环境因素对吸附效果有显著影响。将凝胶负载于棉纱制备的复合吸附滤芯可较好地适应其内扩散吸附的行为特点,达到穿透、衰竭时对应的凝胶单位吸附量分别为285.9、562.2 mg/g。较高的动态饱和吸附量和简便的制备工艺使其具有潜在工业应用价值。
A cationic hydrogel adsorbent was prepared by solution polycondensation using multifunctional monomer as raw materials, which was thereafter loaded on cotton gauze to prepare hydrogel-gauze composite adsorption filter. The adsorption behavior and mechanism of anionic surfactant sodium dodecyl benzene sulfonate(SDBS) from aqueous solution by hydrogel and filter were investigated via batch and column experiments, respectively.Experimental results showed that the adsorption was attributed to a combination of electrostatic attraction and hydrogen bonding between hydrogel and SDBS. The process was mainly controlled by intra-hydrogel diffusion adsorption and the equilibrium adsorption amount was higher than 850 mg/g.Moreover, the efficiency was greatly affected by solution pH and Na Cl content. Composite filter prepared by hydrogel-loaded cotton gauze was suitable for this adsorption behavior. The amount of adsorbed SDBS per gram of hydrogel at breakthrough and bed exhaustion was 285.9, 562.2 mg/g, respectively.The high adsorption capacity and facile preparation process gave it a potential utility value for industrial application.
A cationic hydrogel adsorbent was prepared by solution polycondensation using multifunctional monomer as raw materials, which was thereafter loaded on cotton gauze to prepare hydrogel-gauze composite adsorption filter. The adsorption behavior and mechanism of anionic surfactant sodium dodecyl benzene sulfonate(SDBS) from aqueous solution by hydrogel and filter were investigated via batch and column experiments, respectively.Experimental results showed that the adsorption was attributed to a combination of electrostatic attraction and hydrogen bonding between hydrogel and SDBS. The process was mainly controlled by intra-hydrogel diffusion adsorption and the equilibrium adsorption amount was higher than 850 mg/g.Moreover, the efficiency was greatly affected by solution pH and Na Cl content. Composite filter prepared by hydrogel-loaded cotton gauze was suitable for this adsorption behavior. The amount of adsorbed SDBS per gram of hydrogel at breakthrough and bed exhaustion was 285.9, 562.2 mg/g, respectively.The high adsorption capacity and facile preparation process gave it a potential utility value for industrial application.
引文
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[12]王利平,张继义,武英香,等.麦草对水中苯胺的动态吸附研究[J].环境工程学报,2011,5(12):2755-2760.
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[15]刘柏辰,孙晓锋,景占鑫,等.磁性半纤维素接枝聚丙烯酰胺凝胶对亚甲基蓝的吸附研究[J].水处理技术,2013,39(5):13-17,22.
[2] RIVERA-UTRILLA J, MENDEZ-DIAZ J D, SANCHEZ-POLO M,et al. Removal of the surfactant sodium dodecylbenzenesulphonate from water by simultaneous use of ozone and powdered activated carbon:Comparison with systems based on O3and O3/H2O2[J].Water Research,2006,40(8):1717-1725.
[3]陈芳艳,施琦,唐玉斌.微波强化Fenton氧化法降解水中阴离子表面活性剂的研究[J].水处理技术,2011,37(6):23-26.
[4]刘赫.表面活性剂对微生物降解污水中有机物的影响[J].环境科学与技术,2014,37(1):144-147.
[5] BAUTISTA-TOLEDO M I, RIVERA-UTRILLA J, MENDEZ-DIAZ J D, et al. Removal of the surfactant sodium dodecylbenzenesulfonate from water by processes based on adsorption/bioadsorption and biodegradation[J].Journal of Colloid and Interface Science,2014,418:113-119.
[6] NCIBI M C, GASPARD S, SILLANPA M. As-synthesized multiwalled carbon nanotubes for the removal of ionic and non-ionic surfactants[J].Journal of Hazardous Materials,2015,286:195-203.
[7] Visa M, Duta A. Ti O2/fly ash novel substrate for simultaneous removal of heavy metals and surfactants[J].Chemical Engineering Journal,2013,223:860-868.
[8] MA J, QI J, YAO C, et al. A novel bentonite-based adsorbent for anionic pollutant removal from water[J].Chemical Engineering Journal,2012,200-202:97-103.
[9]胡跃飞,林国强.现代有机反应:第二卷——碳氮键的生成反应[M].北京:化学工业出版社,2008,106-108.
[10]陈浩凡,潘仕荣,胡瑜,等.胶体滴定法测定羧甲基壳聚糖的取代度[J].分析测试学报,2003,22(6):70-73.
[11]污水综合排放标准:GB 8978-1996[S].
[12]王利平,张继义,武英香,等.麦草对水中苯胺的动态吸附研究[J].环境工程学报,2011,5(12):2755-2760.
[13] DU L N, WANG B, LI G, et al. Biosorption of the metal-complex dye Acid Black 172 by live and heat-treated biomass of Pseudomonas sp. strain DY1:Kinetics and sorption mechanisms[J].Journal of Hazardous Materials,2012,205/206:47-54.
[14] XIAO J X, ZHANG Y, WANG C, et al. Adsorption of cationicanionic surfactant mixtures on activated carbon[J].Carbon,2005,43(5):1032-1038.
[15]刘柏辰,孙晓锋,景占鑫,等.磁性半纤维素接枝聚丙烯酰胺凝胶对亚甲基蓝的吸附研究[J].水处理技术,2013,39(5):13-17,22.