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为实现高镁锂比盐湖卤水的锂镁分离,合成了一种新的锂离子吸附球形树脂。该树脂采用对锂离子有特定螯合作用的二苯并-14-冠-4为功能单元,并与有机磷酸酯形成对锂离子起协同作用的萃取体系,以聚氨酯为树脂骨架,通过悬浮聚合得到锂离子吸附球形树脂。悬浮聚合以二甲基硅油为分散介质、以粒度为300~400目的碳酸钙为稳定剂、n(羟甲基化产物)∶n(有机磷酯)∶n(甲苯二异氰酸酯)=1∶1∶28,以聚醚多元醇为交联剂、锂溶液为模板致孔剂,反应温度为80℃,时间为10 h,搅拌速度为280 r/min,得到粒度范围为55.36~76.33μm的球形树脂。热分析表明,树脂是均质的,具有较高的热稳定性。树脂经索氏抽提8 h的溶损率为1.5%,说明其在水中使用是稳定的。在pH 7、恒温振荡温度为25℃、振荡时间为4 h条件下,得到树脂对锂的最大吸附容量为0.609 9 mmol/g,其对锂镁选择性系数β=39;经过5次再生实验,其树脂饱和吸附容量仅下降1.8%,表明树脂可多次使用。 相似文献
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高吸油性树脂的合成及性能研究 总被引:6,自引:0,他引:6
以甲基丙烯酸十二酯和甲基丙烯丁酯为单体、水为分散相、过氧化苯甲酰为引发剂,采用悬浮聚合法合成高吸油性树脂。研究了交联剂浓度、共聚单体比、引发剂用量、水油比、分散剂用量和反应温度等对高吸油性树脂性能的影响。 相似文献
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以甲基丙烯酸甲酯和丙烯酸丁酯为主要单体,采用悬浮聚合法合成了低交联度的高吸油性树脂,考察了单体配比,交联剂,引发剂,分散剂用量对树脂吸油性能的影响。 相似文献
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丙烯酸系高吸油性树脂的合成及性能研究 总被引:1,自引:0,他引:1
采用悬浮聚合法合成了丙烯酸系高吸油性树脂,研究了悬浮聚合丙烯酸系吸油性树脂中不同单体配比、交联剂用量、反应温度等因素对吸油性树脂的吸油倍率的影响。实验结果表明:在优化条件下,吸油性树脂的吸苯能力最大,为19.5g/g。 相似文献
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以甲基丙烯酸十六烷基酯、丙烯酸丁酯和苯乙烯为共聚单体,采用悬浮聚合法合成了三元丙烯酸酯类交联型高吸油树脂,对高吸油树脂进行了分子结构及微观形貌表征,并研究了树脂在柴油、汽油、航空煤油等常用燃油中的吸附倍率(3 min吸附)和饱和吸附倍率。结果表明:所制高吸油树脂颗粒均为规则的球形;对柴油、汽油、航空煤油的吸附倍率分别达5.35,7.28,6.69 g/g;饱和吸附倍率分别为15.41,12.97,13.04 g/g;高吸油树脂去除水面柴油的效果高达99.8%,具有优异的吸燃油性能。 相似文献
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研究了717强碱阴离子交换树脂对苯酚的吸附性能。结果表明,在pH=10~13时,吸附能力最好。等温吸附符合Freundlich和Langmuir经验式。在293~313 K条件下,苯酚吸附量为220~260 mg/g的吸附焓变为-13.69~-12.02 kJ/mol,吸附自由能变为-7.02~-7.21 kJ/mol,吸附熵变为-22.76~-15.37 J/(K.mol)。吸附动力学符合Lagergren准二级速率方程,吸附速率常数为8.5×10-4~2.74×10-3g/(mg.min),吸附活化能为44.1 kJ/mol。303 K下其静态累积饱和吸附容量为399.8 mg/g(4.253 mmol/g)。用0.05 mol/L HCl溶液能定量洗脱苯酚,洗脱率达99%。 相似文献
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Completely water‐insoluble resins containing amine, carboxylic acid, and sulfonic acid as ligand groups were synthesized by radical polymerization in solution. The yield was higher than 97%. The resins were characterized by FTIR spectroscopy and thermal analysis. The metal ion retention properties at different pH values were investigated by a batch method. Metal ions studied were: Cu(II), Cd(II), Zn(II), Hg(II), Pb(II), and Cr(III). The metal ion binding ability depended strongly on the pH. The retention properties were also tested under competitive conditions. Elution of the metal ion was investigated in acid medium at different concentrations. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 700–705, 2003 相似文献
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通过接枝反应制备了一系列以聚环氧氟丙烷为主链,侧链末端含吡咯配位基的HPnCP(n=6.4,2)螯合树脂。各步产物的化学结构经IR和^1H NMR检测得以确认。静态吸附实验及等温吸附实验结果表明:该类树脂对Cu(Ⅱ)和Hg(Ⅱ)有着较好的吸附性能(大于1.0mmol/g);对Co(Ⅱ)和Cd(Ⅱ)达到饱和吸附时的平衡浓度约为(0.06~0.07)mol/L;HP4CP对Co(Ⅱ)和Cd(Ⅱ)以及HP2CP对Co(Ⅱ)的等温吸附既可用Langmuir方程描述也可用Freundlich方程描述;但HP2CP时Cd(Ⅱ)的等温吸附不符合Langmuir方程,只可用Freundlich方程描述。 相似文献
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通过进行静态和动态吸附实验,研究了不同型号大孔树脂对红富士苹果多酚的吸附特性。各型号大孔树脂的静态与动态吸附性能及解析率不同,但差异不显著(p0.05),且吸附及解析规律基本一致,其吸附及解析性能顺序为XDA-5AB-8D-101XDA-7;XDA-5大孔树脂静态和动态吸附性能和解析性能均最好,其静态解析率和动态解析率分别达(69.281±0.214)%和(73.585±0.499)%;XDA-5大孔树脂对苹果多酚的静态和动态吸附性能均比其他类型树脂好,且XDA-5对苹果多酚的动态吸附的吸附量和解析率均较静态吸附更高。 相似文献
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The main goal of this study was to obtain acrylonitrile (AN)‐divinylbenzene (DVB) copolymer beads that can serve as the matrix for preparation of amidoxime resins. AN‐DVB amidoxime resin was synthesized via suspension polymerization and the effect of different parameters such as the speed of stirrer, the amounts of suspending agent, hydrophilic agent, diluent agent, and initiator on its properties was investigated by fractional factorial (Taguchi) experimental design method. This method gives much‐reduced variance for the experiments with optimum control parameters setting and provides a set of minimum experiments compared to the conventional methods. The results showed that the most effective parameters on the amidoximation of resins were hydrophilic agent content, speed of stirrer, and the amount of suspending agent, respectively. Furthermore, anion‐exchange capacity of the amidoxime resins was utilized as a criterion for the evaluation of amidoxime adsorbent groups and the adsorption potential of the synthesized resins was determined by cation‐exchange capacity. The amount of methylacrylate as a hydrophilic agent had the most significant effect on the ion‐exchange capacity of the final product. Swelling ratio was also measured to evaluate the adsorption capacity of the synthesized resin. The results showed that the amounts of hydrophilic and diluent agents had significant effects on swelling ratio of resin. Finally, cation‐exchange capacity and swelling ratio of amidoxime resin were changed greatly because of alkaline treatment, but it had no significant effect on the anion‐exchange capacity of the synthesized resin. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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Liping Zhang Caihua Ni Changping Zhu Xiang Jiang Yuping Liu Bo Huang 《应用聚合物科学杂志》2009,112(4):2455-2461
A novel chelating resin was synthesized in just one step under mild synthetic conditions. The synthesis was carried out through the copolymerization of thiosemicarbazide and formaldehyde in an aqueous solution. The adsorption properties for some noble metal ions were investigated. The results showed that the resin had high adsorption selectivity for Au(III) and Ag(I). The adsorption capacities for the two metal ions reached up to 7.3 and 11.8 mmol/g, respectively. The adsorption rate for the two metal ions in a dilute solution was 99.9%. The adsorption fit first‐order kinetics, and an isothermal adsorption study indicated that it corresponded to Langmuir monomolecular layer adsorption. The change in the bonding energy during the chelating process was investigated with X‐ray photoelectron spectroscopy. The study revealed that nitrogen and sulfur atoms of the resins were electron donors and metal ions were electron acceptors in the process. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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木棉基活性炭纤维的结构与吸附性能 总被引:3,自引:0,他引:3
采用浸渍磷酸氢二铵及化学活化法制备了3种木棉基活性炭纤维,其中AK-1没有经过预氧化处理,AK-2先浸渍再经预氧化处理,AK-3先经预氧化处理再浸渍;表征了3种活性炭纤维的表面物理化学结构及吸附性能。结果表明:3种活性炭纤维的平均孔径均约为2nm;预氧化处理提高了纤维的比表面积和纤维表面的含氧基团含量。AK-1具有最大的苯酚吸附量为65.8mg/g;AK-3具有最大的亚甲基蓝吸附量为156.7mg/g;AK-2具有最大的比表面积为1518m2/g和最多的表面含氧基团,对苯酚和亚甲基蓝的吸附量均不高,说明表面含氧基团降低了纤维对苯酚和亚甲基蓝的吸附量。吸附动力学研究表明,木棉基活性炭纤维吸附苯酚和亚甲基蓝符合拟二级动力学方程。 相似文献
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锌铝水滑石的控制合成及吸附性能研究 总被引:1,自引:0,他引:1
采用简单的水热法和均匀共沉淀法合成了不同形貌的锌铝水滑石(Zn Al-LDHs),通过XRD、SEM、N2吸附等对合成的试样进行了表征;研究了甲基橙在Zn Al-LDHs上的吸附性能,考察了酸碱度和温度等对其吸附性能的影响。结果表明:采用水热法,添加乙二醇可合成出海胆状Zn Al-LDHs,添加乙醇可合成出花状Zn Al-LDHs;采用均匀共沉淀法可合成出片状Zn Al-LDHs。其中海胆状Zn Al-LDHs的比表面积最高,达147.3 m2/g,对甲基橙具有优异的吸附性能。在25℃,初始p H=3的条件下,0.2 g/L海胆状Zn Al-LDHs对100 mg/L甲基橙的吸附容量和去除率分别达368 mg/g和73.65%,其吸附动力学和吸附等温线分别符合准二级速率方程和Langmuir方程。 相似文献