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采用二甲胺为功能化试剂,化学修饰氯甲基化苯乙烯-二乙烯基苯共聚物合成了大孔交联聚(N-对乙烯基苄基二甲胺)树脂,测得树脂的氯含量由4.2mmol/g降低到0.24mmol/g,树脂的弱碱交换量为4.0mmol/g,说明氯甲基化苯乙烯-二乙烯基苯共聚物发生胺化反应完全。在水溶液中,测定了大孔交联聚(N-对乙烯基苄基二甲胺)树脂对苯酚的吸附等温线,发现吸附平衡数据符合Freundlich等温吸附方程,相关系数大于0.99。计算得到在吸附量为15、20和25mg/g时,等量吸附焓在-20.81~-30.74kJ/mol范围内,吸附自由能和吸附熵均小于0,说明吸附过程中存在氢键作用,吸附是自发、混乱度变小的过程。比较树脂对水溶液中苯酚、对硝基苯酚和对硝基甲苯的吸附性能以及树脂对水、环己烷、乙醇和乙酸乙酯溶液中苯酚的吸附性能,进一步说明大孔交联聚(N-对乙烯基苄基二甲胺)树脂对水溶液中苯酚的吸附是基于疏水作用和氢键作用协同的机理。 相似文献
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测定了聚(对乙烯基苄基己内酰胺)吸附树脂对正庚烷溶液中苯酚的吸附等温线,发现吸附等温线符合Freundlich等温吸附方程,相关系数大于0.99.根据热力学函数关系计算了等量吸附焓、Gibbs吸附自由能和吸附熵,等量吸附焓在30~40kJ/mol之间,推测吸附过程为氢键吸附.通过比较树脂对正庚烷中苯酚和邻硝基苯酚的吸附性能的差别,进一步论证了树脂对非水体系中酚类物质的吸附是基于氢键作用的机理.同时,聚(对乙烯基苄基己内酰胺)树脂对正庚烷溶液中苯酚的吸附相对水溶液中苯酚的吸附有更低的吸附焓变、吸附自由能变和吸附熵变. 相似文献
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聚(N-甲基-N-对乙烯基苄基乙酰胺)对水中苯酚的吸附 总被引:2,自引:0,他引:2
由大孔交联氯甲基化聚苯乙烯进行甲胺化和乙酰化反应,合成了聚(N-甲基-N-对乙烯基苄基乙酰胺)树脂,树脂的氯含量由原来的3.95mmol/g降至0.63mmol/g.测定了树脂对水中苯酚的吸附等温线,结果表明,吸附平衡数据符合Freundlich等温方程.利用热力学函数关系计算了吸附焓、吸附自由能和吸附熵,结果表明,吸附量在10~40mg/g时,吸附焓为-71.20~-24.65kJ/mol,吸附自由能为-4.64~-6.07kJ/mol,吸附熵为-62.35~-218.56J/(mol·K).讨论了吸附过程中树脂对水中苯酚吸附的氢键与疏水作用的吸附机理. 相似文献
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大孔交联聚(对乙烯基苄基苯基醚)树脂对苯酚的吸附机理 总被引:1,自引:0,他引:1
由氯甲基化聚苯乙烯合成了大孔交联聚(对乙烯基苄基苯基醚)树脂(简称为苯基醚树脂), 测定了其对正己烷和水中苯酚的吸附等温线, 计算了吸附焓. 同时, 比较了聚(对乙烯基苄甲醚)、苯基醚树脂、聚(对乙烯基苄基对硝基苯基醚)和聚(对乙烯基苄基对甲基苯基醚)对正己烷中苯酚的吸附性能以及氯甲基化聚苯乙烯和苯基醚树脂对水中苯酚、2,3,5-三甲基苯酚和对硝基甲苯的吸附性能. 结果表明, 苯基醚树脂是通过氢键吸附正己烷溶液中苯酚的, 而其对水中苯酚的吸附是基于氢键和疏水作用的协同. 相似文献
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D301大孔树脂吸附钒(V)的性能研究 总被引:3,自引:0,他引:3
研究了D301大孔树脂对钒的吸附性能.结果表明,pH值对D301树脂吸附钒的影响很大,与钒在溶液中的赋存状态有关,且在pH=2时吸附效果最好:测得吸附热力学参数分别为:△H=8.97kJ/mol,△G_(313)=-5.69kJ/mol,△G_(303)=-5.2kJ/mol,△G_(293)=-4.9kJ/mol,△S=46.84J/mol·K.等温吸附服从Freundlich经验式;考察了溶液浓度、搅拌速率对交换过程的影响,并对实验数据运用相关理论模型进行拟合,结果显示钒(V)在D301树脂上吸附交换过程控制步骤为颗粒扩散控制,反应级数n为0.2391. 相似文献
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Two hydrogen-bonding adsorbents-macroporous crosslinked poly(P-nitrostyrene)and poly(p-vinylbenzyl amide)-were synthesized,and the adsorption property of phenol from cyclohexane solution onto the adsorbents was studied,The differential adsorption heasts for varied adsorption capacities calculated from the adsorption isotherms according to the Claperyron-Clausius equation lay in the range of hydrogen bond energy (8-50kJ/mol),The adsorption capaccity of o-nitrophenol in cyclohexane was moch less than that of phenol under the same condition.The adsorption capacity of phenol from cyclohexane onto polyacrylonitrile was much less than that onto poly(p-nitrostyrene)or poly(p-vinylbenzyl amide),All these results revealed that adsorption of phenol from cyclohexane by poly(p-nitrostyrene) or poly(p-vinylbenzyl amide)is based on hydrogen-bonding. 相似文献
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XU Mancai WANG Cairong SHI Zuoqing XU Mingcheng ZHANG Shang LI Haitao. FAN Yunge HE Binglin. 《Chinese Journal of Reactive Polymers》2000,(1)
1 INTRODUCTIONHydrogen-bonding adsorbents are functional polymers for adsorption and separation via theformation of hydrogen bond between the adsorbentS and adsorbates. Because hydrogen bond is astrong intermolecular (or intramolecular) force, hydrogen-bonding adsorbents have strong potentto adsorbing adsorbates with which can form hydrogen bond. In our previous work, three seriesof hydrogen-bonding adsorbents have been studied, which were adsorbents with hydrogendonator, adsorbentS with … 相似文献
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Spherical crosslinked polystyrene-isocyanuric acid resin was synthesized by reaction of chloromethylated polystryene with isocyanuric acid.The sorption isotherms of phenol from aqueous solution and cyclohexane solution onto the resin were measured.It is of interest to notice that the resin sorbed phenol efficiently though its specific surface area was 0 and did not swell in water,and the sorption capactity from aqueous solution was close to that of phenol onto XAD-4 at the same equilibrium concentration.Sorption enthalpies calculated from the isotherms according to the Clausius-Clapeyron equation were -21-25kJ/mol and -39-41kJ/mol respectively.These values impled that the sorption processes were based on hydrogen bonding.In addition.the details of the hydrogen bonding between the active sites of the resin and phenol were suggested. 相似文献
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XU Maneai ZENG Ying . SHI Zuoqing XU Mingcheng LI Haitao YU Shanxin FAN Yunge HE Binglin 《Chinese Journal of Reactive Polymers》2000,(1)
I INTRODUCTIONIn our previous work, three series of macroporous hydrogen-bonding adsorbents have beenstudied, which were adsorbents with hydrogen donator, adsorbents with hydrogen acceptor, andadsorbents with both hydrogen donator and acceptor if-31. If a gel-type resin with hydrogendonator and/or acceptor contacts with a compound with hydrogen acceptor and/Or donatof, canthe gel-type resin sorb the compound based on of hydrogen bonding? Here we report the sorptionof phenol onto gel-type … 相似文献
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The adsorption isotherms of caffeine from aqueous solution onto three hydrogen donating adsorbents-hydroxypolystyrene,polystryene-azo-pyrogallol,and D72 resin-were measured.The adsorption enthalpies calculated from the isotherms according to the Clausisu-Clapeyron equation were -24-36kJ/mol,-32-37kJ/mol,and -19-24kJ/mol respectively.These values implied that the adsorption processes were based on hydrogen bonding.Furthermore.the mechanism of the adsorption of caffeine onto D72 resin was studied by IR spectra and the small molecular model experiments,and the results showed that the adsorption of caffeine onto hydrogen donating adsorbents was based on hydrogen bonding. 相似文献