共查询到19条相似文献,搜索用时 109 毫秒
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石化污泥制备吸附剂及其脱硫机理研究 总被引:5,自引:0,他引:5
以石化污泥为原料,采用不同方法制备了烟气脱硫吸附剂,探讨了影响产物吸附性能的因素及吸附机理。得到了石化污泥吸附剂的吸附等温线。结果表明,石化污泥利用热解炭化法制备的烟气脱硫吸附剂性能较好,其吸附过程可用Freundlich模型描述,SO2-O2-N2体系吸附机理主要为物理吸附,SO2-O2-H2O(g)-N2体系SO2发生了催化氧化,以化学吸附为主。 相似文献
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污泥含炭吸附剂对甲苯的吸附性能研究 总被引:2,自引:1,他引:1
采用改进的ZnCl2化学活化法制备污泥含炭吸附剂,利用X射线能谱仪、X射线光电子能谱仪、傅里叶变换红外光谱仪等对其结构进行表征。并采用动态吸附法对甲苯废气的吸附特性进行研究。结果表明,污泥含炭吸附剂对中低浓度甲苯(2700mg·m-3)具有很好的吸附能力,其对甲苯的吸附容量随着甲苯进口浓度的增加而增大,随着吸附温度的升高而降低,随着进气流量的减小而增大;在吸附温度为20℃,气体流量为500mL·min-1(停留时间为0.424s),甲苯浓度为2700mg·m-3时,甲苯的饱和吸附容量为150.0mg·g-1;研究表明污泥含炭吸附剂对甲苯的吸附以物理吸附为主,并具有一定的化学吸附和催化氧化作用,其实验结果与Langmuir方程吻合较好。该吸附剂可在常温和有机物浓度较低的条件下用来部分替代活性炭使用。 相似文献
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近年来,一些生物材料(如海藻,细菌,霉菌和酵母等),或某些工业或农业生产的废物产品被认为是可去除有毒金属的廉价吸附剂。从对蟹壳,泥炭,向日葵杆,松树皮或海产品加工废物污泥对废水中金属的脱除能力的研究中,发现它们有相当有效的去除能力。由于它们廉价,来源丰富,以及可考虑为废物再用,因此已引起研究人员的关注。 相似文献
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利用剩余污泥对Cu2+、Zn2+、Cd2+三种重金属离子进行吸附研究,考察了pH、吸附时间、污泥投加量、温度等对吸附过程的影响;并探讨了吸附处理过程中三种重金属离子的等温吸附特性,以及吸附数据的线性拟合方程。实验结果表明,剩余污泥对Cu2+、Zn2+、Cd2+三种重金属离子具有良好的吸附效果,在优化条件下,三种重金属离子去除率分别达到94.3%、70.5%和81%;三种重金属离子的吸附等温线均与Langmuir方程吻合较好,吸附能力大小顺序为Cu2+Cd2+Zn2+。 相似文献
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含镉的废旧碱性镉镍蓄电池,其主要成份为镉镍氧化物及盐类,国外曾有关于回收的专利方法但其流程长且复杂。我们利用其组成中镉镍氧化物和盐在化学性质上的微小不同,采用控制酸度浸取,通过试验找到分离回收镉的简单方法,并在某化工厂应用,回收生产出合格的镉黄颜料。试验部分物料经机械破碎分离出镍、铁金属极板送冶金厂熔炼回收镍铁。余下蓄电池废料主要由镉镍的氧化物及碳酸盐和其他微量杂质和部分有机物所组成,如表1。 相似文献
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This paper demonstrates that digested sludge can be reclaimed as an adsorbent for the removal of organic vapors (MEK, TOL and TCE) through the use of a pyrolysis. The manufactured adsorbent products were characterized by Brunauer, Emmentt and Teller (BET) surface area, carbon tetrachloride activity (ANSI/ASIM D3467–76'), and an elemental analysis test. Both the determination of CCl4 activity and BET surface area were regarded as the useful means for estimation of the adsorption capacity of organic vapors on the reclaimed adsorbents. From the view point of specific surface area (CCl4 activity number or adsorption capacity), it was concluded that the optimum condition for manufacturing the reclaimed adsorbent was by adding 5 kmols/m3 ZnCl2 to the treated sludge and then heating the mixture at 550°C for 1 hour. 相似文献
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利用城市污水处理厂的剩余污泥对水中F-进行吸附处理,通过污泥投加量、F-初始质量浓度、时间、pH等反应条件的研究,探讨除氟效果和影响因素。结果表明,室温下,污泥对F-的吸附在60 min后达到平衡;20 g/L的污泥投加量对10 mg/L含氟水的F-去除率可达83.1%;污泥可在3~10的较大pH范围内保持稳定的除氟效果。准二级动力学模型很好地拟合了污泥对F-的吸附行为,Langmuir和Freundlich模型均符合污泥对F-的吸附特性,热力学参数的计算表明该吸附过程是自发的放热反应。 相似文献
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Removal of Cd2+, Cu2+, Ni2+, and Pb2+ ions from aqueous solutions using tururi fibers as an adsorbent
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Diego Q. Melo Carla B. Vidal André Leandro da Silva Raimundo N. P. Teixeira Giselle Santiago Cabral Raulino Thiago C. Medeiros Pierre B. A. Fechine Selma Elaine Mazzeto Denis De Keukeleire Ronaldo F. Nascimento 《应用聚合物科学杂志》2014,131(20)
This work investigates the removal of Cd2+, Cu2+, Ni2+, and Pb2+ ions from aqueous solutions using tururi fibers as an adsorbent under both batchwise and fixed‐bed conditions. It was found that modification of the tururi fibers with sodium hydroxide increased the adsorption efficiencies of all metal ions studied. The fractional factorial design showed that pH, adsorbent mass, agitation rate, and initial metal concentration influenced each metal adsorption differently. The kinetics showed that multi‐element adsorption equilibria were reached after 15 min following pseudo‐second‐order kinetics. The Langmuir, Freundlich, and Redlich–Peterson models were used to evaluate the adsorption capacities by tururi fibers. The Langmuir model was found to be suitable for all metal ions. Breakthrough curves revealed that saturation of the bed was reached in 160.0 mL with Cd2+ and Cu2+, and 52.0 mL with Ni2+ and Pb2+. The Thomas model was applied to the experimental data of breakthrough curves and represented the data well. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40883. 相似文献
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《分离科学与技术》2012,47(2):277-287
Competitive adsorption of Ag+, Pb2+, Ni2+, and Cd2 ions on vermiuculite in a binary, ternary, and quaternary mixture was investigated in batch experiments. The effects of the presence of Ag+, Ni2+, and Cd2+ ions on the adsorption of Pb2+ ions were investigated in terms of the equilibrium isotherm. Experimental results indicated that Pb2+ ions always favorably adsorbed on vermiculite over Ag+, Ni2+, and Cd2+ ions. The adsorption equilibrium data of Pb2+ ions better fitted the Langmuir model than the Freundlich model. The results showed that the pseudo-second-order kinetics model was in good agreement with the experimental results for all metal ions, and the adsorption rate among the metal ions followed Ag+ > Pb2+ > Ni2+ > Cd2+. The desorption and regenration study indicated that vermiculite can be used repeatedly and be suitable for the design of a continuous process. 相似文献
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The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl2 chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM) ,Fourier transform infrared spectroscopy(FT-IR) ,and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2 ·g-1of BET surface,0.12 and 0.10 ml·g-1of microporous and mesoporous volume,respectively) .The oxygen functional groups such as OH,C O and C O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g-1at 12.58μg·m-3to 87.9μg·g-1at 72.50μg·m-3,and decreased as the adsorption temperature increased,from 246 μg·g-1 at 25°C to 61.3μg·g-1 at 140°C,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g-1and 53.8μg·g-1respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent. 相似文献