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13X沸石吸附处理水中苯胺的性能及应用 总被引:6,自引:0,他引:6
用天然岩石矿物为原料,经过较简单的工艺过程合成13X沸石去除水中苯胺,模拟废水的实验结果表明:沸石对苯胺的吸附速率非常快,吸附时间为10min时,吸附基本达饱和;一般当沸石用量为10g/L时,水蝇苯胺的吸附率达95%,随着pH值的增加,苯胺在沸石上的吸附率较小;温度增加,吸附率有所增加。但常温下,苯胺的吸附率也能达到93%,13X沸石对苯胺的最大吸附量可达10mg/g,其吸附规律较好地符合Freundlich吸附等温式,饱和了苯胺的沸石,用质量分数为20%,温度为60℃的氯化钠溶液洗脱,解吸率近于100%,且解吸后的沸石在未经任何处理的情况下仍能吸附苯胺;对实际苯胺废水的处理结果,也表明13X沸石不仅可有效地去除苯胺,还可以有效地去除废水中的SS,CODCr,氨氮及油等。 相似文献
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在论述沸石结构的基础上,讨论了利用沸石的吸附和离子交换性质去除水中有机物、氨氮、氟离子及硬水软化技术,并提出生物沸石法将使沸石的应用更加广泛。沸石将为过滤和生物过滤提供一种新的材料。沸石由于其自身的结构特点决定了其具有较强的吸附和离子交换能力。采用不同的活化方法,可以有效去除氨氮、有机物、氟离子以及硬度离子,同时还可以去除水中浊度、色度、重金属离子等,处理指标大多优于活性炭或与活性炭相当, 相似文献
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针对高盐废水中的有机物去除问题,本文采用水热法合成了不同硅铝摩尔比(Si/Al)的ZSM-5沸石,并进行XRD、SEM、XRF和BET分析,考察了不同Si/Al沸石对高盐废水有机物的去除效果,研究了沸石的煅烧再生温度,评价了沸石在高盐废水有机物吸附过程中的重复利用性能。结果表明,随着原料Si/Al的增加,ZSM-5沸石粒径逐步减小,比表面积逐步增加,沸石对废水中有机物的吸附效率逐步增大。当原料Si/Al为500时,合成的ZSM-5沸石对废水中有机物的吸附效果较佳,在15次再生重复利用过程中,废水总有机碳(TOC)的去除率均大于92.5%。ZSM-5沸石的最佳煅烧再生温度为650℃。 相似文献
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天然沸石负载壳聚糖吸附废水中铅离子的研究 总被引:4,自引:0,他引:4
根据天然沸石离子交换特性和壳聚糖在溶液中带有的正电荷,将80目天然沸石与65%脱乙酰度壳聚糖的0.5%醋酸溶液混合,使壳聚糖负载在天然沸石上,制成颗粒吸附剂,用于去除废水中Pb2+.最佳工艺条件是壳聚糖与天然沸石质量比为120,颗粒吸附剂用量为15g/L,废水中Pb2+质量浓度不大于100mg/L,pH为4~4.5,吸附平衡时间为8 h,Pb2+去除率为99%.与活性炭吸附法相比,天然沸石-壳聚糖复合吸附剂吸附效果相近,成本仅为其1/6.与单一的天然沸石或壳聚糖相比,该吸附剂对Pb2+离子的吸附能力强,成本低. 相似文献
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近年来,沸石在污水处理领域得到了广泛的应用。但由于沸石的孔径小,通道易堵塞,对污染物的去除效果不理想,其吸附能力往往达不到要求。为了进一步提高沸石的离子交换、吸附等性能,从而提高对水中污染物的去除效率,须对沸石进行处理。简述了Fe、Mn、Cu、Ag、Ce、Al、La、Zn、Na和Ti 10种金属在天然沸石上的负载方法,前9种金属的负载方法主要是浸渍法,最后1种主要是溶胶-凝胶法。综述了经10种金属负载后的天然沸石对药物、染料废水、重金属、含酚废水、氨氮和挥发性有机物等污染物的去除情况和去除机理。同时,对负载型沸石在废水处理中的进一步发展提出了一定的看法和思考。 相似文献
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NaOH改性沸石吸附地下水中铁锰效能研究 总被引:4,自引:0,他引:4
为了提高沸石对铁锰的吸附性能,利用3种不同改性剂对天然沸石进行改性比较对铁锰的去除效果。通过NaOH改性沸石除铁锰的静态吸附试验研究,考察改性沸石对铁锰的去除效果。结果表明NaOH改性沸石对铁锰的去除效果优于NaCl和HDTMA改性沸石对铁锰的去除效果,NaOH改性沸石的投加量、改性沸石的对铁锰的吸附时间、原水的pH值等因素对铁锰的去除效果有较大的影响,最佳投加量为50g/L,最佳吸附时间为120min,最佳pH值为中性偏酸性或者偏碱性且pH值〈8时,对铁锰的吸附规律较好的符合Langmuir吸附等温式。NaOH改性沸石对铁去除率可达83.09%,对锰的去除率为49.65%。经过改性,沸石对铁锰的去除率和吸附容量都有了较大的提高。 相似文献
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皖南天然沸石在水处理中的应用研究 总被引:3,自引:0,他引:3
天然沸石因骨架带有负电荷 ,笼中含有平衡骨架负电荷的 Na+、Ca2 +等可交换的碱或碱土金属离子 ,使其具有离子交换树脂特性。同时 ,因有发达的孔隙和极性表面 ,天然沸石对极性分子和非极性分子都具有良好的吸附性能。皖南沸石矿以丝光和斜发沸石为主 ,溶出物和有毒害元素含量均很低 ,对水体中的 NH+4- N具有吸附速率快 ,吸附容量大等特点 [1] 。为了扩大天然沸石在水处理及环保等方面的应用范围 ,我们考察了皖南天然沸石对不同水体环境中的 NH+4以及 COD和水中优先控制污染物苯酚等的去除效果。1 实验部分1 .1 材料皖南沸石原矿 ,粉碎… 相似文献
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CTMAB—粘土吸附处理水中苯酚,苯胺和对硝基苯酚的性能及应用研究 总被引:29,自引:3,他引:26
本文用溴化十六烷基三甲胺分别改性膨润土,沸石和硅藻土,研究了CTMAB-粘土吸附处理水中苯酚,对硝苯酚和苯胺的适宜条件,探讨了粘土种类,改性时所用CTMAB浓度以及有机物本身性质对粘土吸附性能的影响。 相似文献
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Liquefaction of cornstalk in sub‐ and supercritical cyclohexane with a zeolite catalyst was performed in a stainless‐steel reactor. The reaction system was divided into four lumps: gas, residue, water‐soluble fraction (WSF), and ethanol‐soluble fraction (ESF). The effects of the cyclohexane‐to‐cornstalk ratio, reaction temperature, reaction time, and zeolite amount on the lump yields were studied. The results show that reaction time and temperature had significant effects on the distribution of the products. The amounts of organic acids, acetic ester and aldehyde in the ESF obtained from cornstalk liquefaction with zeolite were higher than without zeolite. The distributions of the WSF changed with zeolite use. The main secondary reaction pathways of bio‐oil generation are proposed. Part of the unstable WSF was converted into the ESF and gas. The ESF further formed a residue through condensation, cyclization and repolymerization in sub‐/supercritical cyclohexane. GC/MS analysis showed that the WSF and the ESF comprised a mixture of organic compounds, which mainly included organic acids, aldehydes, ketones and phenolic compounds. 相似文献
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H. Sudhakar C. Venkata Prasad K. Sunitha K. Chowdoji Rao M. C. S. Subha S. Sridhar 《应用聚合物科学杂志》2011,121(5):2717-2725
Incorporation of zeolites into natural polymers has been shown experimentally to enhance both the flux and selectivity in pervaporative dehydration separation of organic compounds. Pervaporation is a promising membrane technique for separation of volatile organic compounds (VOCs)/water mixtures. In this study, hydrophilic sodium alginate (SA) mixed membranes were prepared using solution casting technique by incorporating zeolites into the polymer matrix. The prepared membranes were characterized by ATR‐Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), scanning electron microscopy (SEM), Thermal Gravimetric Analysis (TGA), and differential scanning calorimetry (DSC) were tested in a laboratory scale pervaporation experimental set‐up. The effect of experimental parameters such as the type and composition of zeolites on permeation flux and selectivity was investigated. When tested on IPA‐water mixtures, the zeolite‐filled membrane was found to give much higher selectivity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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Nanosized zeolite films for vapor-sensing applications 总被引:2,自引:0,他引:2
Colloidal zeolites LTA and BEA sized below 100 nm were synthesized as building blocks for the controlled growth of thin microporous films on piezoelectric sensor devices (quartz crystal microbalance, QCM). The zeolite films were prepared on pre-seeded gold substrates on QCM devices. Initially, a layer of colloidal particles was deposited on the support through chemical bonding with a silane coupling agent, followed by hydrothermal growth. BEA- and LTA-type zeolite films with thicknesses of 250 and 450 nm, respectively, were prepared by optimizing the synthesis conditions. The application of these zeolite films in microsensors for water and organic compounds is presented. The importance of the zeolite structure type with respect to the sensitivity towards different organic and water vapors at various concentrations is discussed. Both zeolites are thermally stable and show reproducible responses during long-term experiments. Based on these results, it was concluded that both zeolite films could be used effectively as humidity sensor materials for water vapor sensing purposes. High sensitivity, good reversibility and long life were demonstrated for this type of zeolite film at low water concentrations. In comparison to LTA, the BEA films show a higher sorption capacity towards water vapor and no rejection of pentane, hexane and cyclohexane, due to the larger pore size of the BEA structure. 相似文献
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