共查询到17条相似文献,搜索用时 277 毫秒
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采用乙醇分散浸渍法对大孔强酸性阳离子树脂(D001)进行改性,制备了纳米羟基铁改性树脂复合材料(nFeOOH@D001),并考察其去除饮用水中Cd(II)的性能。研究结果表明,羟基铁以20~150 nm的粒径均匀负载到D001的表面。与D001相比,nFeOOH@D001对Cd(II)的吸附性能提高了13%,反应过程符合Langmuir吸附模型和准2级动力学,最大吸附量和反应速率常数分别为282 mg/g和0.042 g/(g·h)。nFeOOH@D001具有更强的抗钙镁离子干扰能力,且吸附后的nFeOOH@D001可用醋酸脱附,经5次脱附-吸附循环使用后再生率依然可达77%。失效的nFeOOH@D001可使用1 mol/L的HCl洗脱并重新负载nFeOOH,再生率可达86%,比D001提高了57%。该改性方法在提高树脂吸附Cd(II)性能的同时,增强树脂抗钙镁离子干扰能力并延长其使用寿命。 相似文献
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弱酸性交换树脂处理含铅废水动态吸附行为研究 总被引:1,自引:0,他引:1
采用110弱酸性树脂对废铅酸蓄电池在回收过程中产生的破碎分选废水(浊环水)进行了脱铅深度处理。通过柱动态试验,考察了树脂形态、温度、流速等因素对吸附及脱附的影响。结果表明,优化的吸附条件为:树脂Na型、流速20 BV/h、温度30℃,吸附过程符合Yoon-Nelson模型,流出液前2000BV Pb2+的质量浓度小于1mg/L,树脂饱和吸附量为592.6mg/g;优化的脱附条件:脱附剂HNO3(浓度1.5mol/L)、流速10BV/h、温度20~30℃,脱附液中Pb2+的质量浓度达45.72g/L。 相似文献
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离子交换树脂法吸附醋酸工艺 总被引:1,自引:0,他引:1
采用离子交换树脂法吸附醋酸溶液,并对该过程进行系统的研究. 通过树脂选型确定大孔弱碱性阴离子交换树脂D311,其对醋酸吸附容量较大,且膨胀收缩率较小. 用D311树脂对醋酸含量为1.5%(w)的醋酸溶液进行了吸附和脱附工艺优化研究,考察了体系温度、进料流量等对吸附和脱附过程的影响,在优化条件为温度30.0℃、进料流量4.0 mL/min时,吸附率达93.97%;温度50.0℃、洗脱剂3.98 mol/L NaOH、流量1.0 mL/min时,脱附率达100%. 树脂再生循环结果表明,D311重现性及机械强度较好. 相似文献
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甜菊糖苷的工业提取中,通常以三氯化铁或硫酸亚铁为絮凝剂,对提取液进行絮凝处理,达到初步除杂的目的,从而人为引入了大量的铁离子和酸根离子。为提高后续吸附树脂的吸附量,改善产品品质,在大孔吸附树脂吸附前,对絮凝液进行脱盐脱色是至关重要的。对阳离子树脂001×7、001×14.5、001×16,与阴离子树脂330和D941相互组合,考察了不同组合下脱盐脱色的效果,以及不同流速对甜菊糖苷收率的影响。结果表明,选用阳离子树脂001×14.5与阴离子树脂D941相组合进行脱盐脱色,效果较好,且甜菊糖苷收率可达96.46%;脱盐脱色流速控制在3-4BV/h最佳。 相似文献
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甜菊糖苷的工业提取中,通常以三氯化铁或硫酸亚铁为絮凝剂,对提取液进行絮凝处理。为提高后续吸附树脂的吸附量,改善产品品质,在大孔吸附树脂吸附前,对絮凝液进行脱盐脱色是至关重要的。通过对阳离子树脂001×7、001×14.5、001×16,与阴离子树脂330和D941相互组合,考察了不同组合下脱盐脱色的效果,以及不同流速对甜菊糖苷收率的影响。结果表明,选用阳离子树脂001×14.5与阴离子树脂D941相组合进行脱盐脱色,效果较好,且甜菊糖苷收率可达96.46%;脱盐脱色流速控制在3~4BV/h最佳。 相似文献
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采用阳离子交换树脂D001去除丙烯腈中(口恶)唑。D001的平衡吸附量为37.08 mg·g-1,在20℃、30℃、40℃、50℃下,D001对(口恶)唑的吸附符合Langmuir吸附等温方程。在进料流量为2.0 BV·h-1、体系温度为20℃时,丙烯腈中(口恶)唑的去除率达99%以上。采用5%的HCl为洗脱剂,在其用... 相似文献
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ABSTRACTIn this study, the combination of macroporous adsorbent resins (MARs) and thin-film evaporation coupling distillation (TFECD) was studied systematically, with aim to obtain high value-added squalene from soybean oil deodorizer distillate (SODD). Five types of resins (X-5, D-101, D4020, DM301, and AB-8) were first used to evaluate the adsorption/desorption properties of squalene. D101 resin exhibited higher adsorption/desorption capacities and desorption ratios for squalene based on static adsorption results among the tested resins. We further investigated the adsorption kinetics, isotherms, and thermodynamics with D101 resin as adsorbent. The adsorption of squalene on D101 was best fitted to pseudo-second-order kinetic model and the Langmuir equation. The dynamic adsorption and desorption indicated that similar results were observed in the static adsorption test. The purity of squalene was increased from 7.5 to 82.5% with the recovery up to 88.5% after separation on D101 column. The resin-refined sample was directly subjected to TFECD purification. Under optimized process parameters, the final product with purity of 98.5% and recovery yield of 76.5% was confirmed by high-performance liquid chromatography (HPLC) analysis. The present study provided an effective method for large-scale production of high purity squalene. 相似文献
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处理高浓度氨氮废水的阳离子交换树脂筛选 总被引:6,自引:3,他引:3
目前树脂种类繁多,给处理高浓度氨氮废水的树脂选型带来困难。根据离子交换理论,利用001×7、D61和D001三种阳离子交换树脂,模拟研究了氮肥厂废水(氨氮浓度为915 mg·L-1)氨氮的吸附等温式,在30~50 min内三种树脂对氨氮的吸附基本可达到平衡,吸附等温线均符合Freundlich吸附模式;进而研究了这三种树脂对废水中氨氮吸附的选择性系数、工作交换容量和离子交换速率。结果表明,用D61树脂处理含高浓度氨氮的废水效果较为理想,可以相对较少的用量,使处理后水质达到相关排放标准的要求。 相似文献
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The chelating membranes for adsorption of metal ions were prepared by the photografting of glycidyl methacrylate (GMA) onto a polyethylene (PE) film and the subsequent modification of the resultant GMA‐grafted PE (PE‐g‐PGMA) films with disodium iminodiacetate in an aqueous solution of 55% DMSO at 80°C. The adsorption and desorption properties of the iminodiacetate (IDA) group‐appended PE‐g‐PGMA (IDA‐(PE‐g‐PGMA)) films to Cu2+ ions were investigated as functions of the grafted amount, pH value, Cu2+ ion concentration, and temperature. The amount of adsorbed Cu2+ ions increased with an increase in the pH value in the range of 1.0–5.0. The time required to reach the equilibrium adsorption decreased with an increase in the temperature, although the degree of adsorption stayed almost constant. The amount of Cu2+ ions desorbed from the (IDA‐(PE‐g‐PGMA)) films increased and the time required to reach the equilibrium desorption decreased with an increase in the HCl concentration. About 100% of Cu2+ ions were desorbed in the aqueous HCl solutions of more than 0.5M. The amounts of adsorbed and desorbed Cu2+ ions were almost the same in each cyclic process of adsorption in a CuCl2 buffer at pH 5.0 and desorption in an aqueous 1.0M HCl solution. These results indicate that the IDA‐(PE‐g‐PGMA) films can be applied to a repeatedly generative chelating membrane for adsorption and desorption of metal ions. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99:1895–1902, 2006 相似文献
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离子交换树脂去除水中硝酸盐的研究 总被引:8,自引:3,他引:5
对比研究了国内生产的5种阴离子交换树脂(D201、D301、D407、330、717)对水中NO3-的吸附解吸情况。动态吸附饱和曲线表明,717和D407对NO3-的吸附较好,饱和吸附量分别为82.8mg/mL和54.8mg/mL,其他3种树脂效果很差;717和D407对NO3-的吸附速率也相对较快。5种树脂吸附等温线与经验公式拟合的线性相关性显著,其中330树脂符合BET经验公式,另外4种树脂符合Langmuir经验公式;再生试验表明5种树脂再生率均能达到85%以上。综合研究结果认为,强碱性苯乙烯系阴离子交换树脂717和螯合树脂D407对NO3-具有较好的吸附解吸性能,可作为去除硝酸盐的选用树脂。 相似文献