咪唑烷修饰的吸附树脂对水溶液中2-咪唑烷酮的吸附

合成了一种用咪唑烷修饰的超高交联吸附树脂LG-01,并用二甲氨基修饰的超高交联吸附树脂NDA99作对照,比较了它们对水溶液中2-咪唑烷酮的静态吸附和脱附行为。结果表明,经过咪唑烷修饰的吸附树脂LG-01在一定温度时对2-咪唑烷酮的吸附过程中存在不可逆吸附作用和氢键作用,LG-01对2-咪唑烷酮的吸附能力明显强于NDA99,2种树脂对2-咪唑烷酮的吸附均符合Langmuir方程和Freundlich方程。     

乙酰苯胺修饰的吸附树脂对对甲苯胺的吸附机理研究

合成了一种用乙酰苯胺修饰的新型超高交联吸附树脂ZH-05,并用Amberlite XAD-4作对照,比较了它们对水溶液中对甲苯胺的静态吸附和脱附行为。结果表明:经过乙酰苯胺修饰的吸附树脂ZH-05在一定温度下对对甲苯胺的吸附过程中存在化学吸附,ZH-05对对甲苯胺的吸附能力明显强于AmberliteXAD-4,两种树脂对甲苯胺的吸附均符合Freundlich方程。     

单宁酸修饰的吸附树脂对对甲苯胺和对氯苯胺的吸附行为

通过Friede-l Crafts后交联及化学修饰反应制备了单宁酸修饰的超高交联吸附树脂(FZH-11)。通过等温吸附-脱附、吸附动力学和小柱动态吸附脱附实验,研究了FZH-11树脂对对甲苯胺和对氯苯胺的吸附性能。结果表明,FZH-11树脂有较高比表面积和微孔面积,对苯胺类化合物有良好的吸附性能,对对甲苯胺和对氯苯胺的吸附过程存在着明显化学吸附作用。FZH-11树脂对苯胺类化合物的吸附可分为大孔和中孔区的吸附与微孔区的吸附两个独立的吸附动力学过程,均可用准一级动力学方程进行拟合。10%的HCl溶液对吸附苯胺类化合物饱和后的FZH-11树脂有良好的再生效果。     

弱酸性吸附树脂对水溶液中咪唑烷的吸附

利用超高交联吸附树脂NDA150和NDA99对不同温度下水中咪唑烷的静态吸附实验,研究了NDA99和NDA150对咪唑烷的吸附情况,提出了对树脂表面修饰的设想,并进行了静态吸附和实际废水的动态吸附验证,结果表明,具有弱酸性的超高交联吸附树脂对咪唑烷具有较好的吸附选择性。     

萘酚修饰超高交联吸附树脂的制备及吸附动力学

明胶为分散剂,液蜡为致孔剂,交联反应中溴乙烷代替有毒氯甲醚,以β-萘酚参与Friedel-Crafts后交联反应,成功制备了酚羟基修饰的超高交联吸附树脂LM-6。树脂物理性能研究表明,LM-6具有比苯酚修饰超高交联树脂更大的比表面积和酚羟基含量;扫描电镜(SEM)表明,β-萘酚修饰的超高交联吸附树脂具有纳米吸附高分子材料特征;动力学分析表明,树脂对β-萘酚吸附界面层厚于萘,树脂和β-萘酚分子间具有更大的吸附力;拟合曲线均不经过原点说明LM-6对β-萘酚和萘的吸附由颗粒内扩散和颗粒外膜扩散共同控制。     

萘酚修饰超高交联吸附树脂的制备及吸附动力学EI北大核心

明胶为分散剂,液蜡为致孔剂,交联反应中溴乙烷代替有毒氯甲醚,以β-萘酚参与Friedel-Crafts后交联反应,成功制备了酚羟基修饰的超高交联吸附树脂LM-6。树脂物理性能研究表明,LM-6具有比苯酚修饰超高交联树脂更大的比表面积和酚羟基含量;扫描电镜(SEM)表明,β-萘酚修饰的超高交联吸附树脂具有纳米吸附高分子材料特征;动力学分析表明,树脂对β-萘酚吸附界面层厚于萘,树脂和β-萘酚分子间具有更大的吸附力;拟合曲线均不经过原点说明LM-6对β-萘酚和萘的吸附由颗粒内扩散和颗粒外膜扩散共同控制。     

胺基修饰超高交联吸附树脂的制备与吸附性能研究

分别以甲胺、二甲胺和三甲胺参与Friedel-Crafts后交联反应,成功制备了胺基修饰的超高交联聚苯乙烯吸附树脂LY-1、LY-2和LY-3.物化特征研究表明:三者都符合纳米吸附高分子材料特征.吸附研究表明,水体系中3种树脂对苯酚的吸附性能均优于苯胺,在相同平衡浓度下,吸附量大小顺序都为:LY-1＞LY-2＞LY-3...     

腰果壳油基超交联聚合物的制备及吸附VOCs性能EI北大核心

以农业副产物腰果壳油为原料,通过外交联法和溶剂交联法分别制备超交联聚合物(HCPs)吸附剂F-HCP和C-HCP,并对其吸附挥发性有机化合物(VOCs)性能进行研究。采用红外光谱(FTIR)、热重分析(TGA)、N2吸-脱附法和扫描电子显微镜(SEM)等方法对制备的吸附剂进行表征,以静态吸附法考察两种超交联聚合物对六种VOCs的吸附性能,以邻二甲苯为典型VOC进行动态吸附,探讨进气浓度对吸附能力的影响。结果表明:相较于C-HCP,F-HCP显示出较高的静态吸附性能,其对邻二甲苯、甲苯、环己烷、正己烷、丁酮、丙酮的静态吸附量分别为930,801,300,214,203,164 mg·g^(-1);在进气浓度为2171 mg·m^(-3)时,F-HCP和C-HCP对邻二甲苯的动态吸附量分别为149 mg·g^(-1)和146 mg·g^(-1),平衡吸附量随进气浓度的增加而增大。循环再生吸附实验表明,C-HCP 5次循环吸附后的吸附量为首次吸附量的93.9%。     

氨基酸修饰的吸附树脂对间苯三酚的吸附效果

采用脯氨酸、甘氨酸或L-谷氨酸三种氨基酸分别在NDA150上进行化学修饰(分别代号为ZHP02、ZHG02、ZHL02),并以NDA150为参照,用红外、比表面积孔径测定仪和元素分析仪进行了表征。在不同温度下将修饰的树脂用于对水中间苯三酚进行静态吸附实验,考察其吸附容量,并以实际废水进行了动态吸附和脱附验证,结果表明,羧酸基对吸附间苯三酚具有较好的吸附选择性,静态吸附和脱附条件的比较结果也证实了吸附过程中存在不可逆化学吸附。     

巯基修饰的超高交联树脂对酚类化合物的吸附

对超高交联聚苯乙烯树脂进行巯基修饰,对比大孔吸附树脂(Amberlite XAD-4)对苯酚、对甲苯酚、对氯苯酚、对硝基苯酚在水溶液中进行吸附研究。经过巯基修饰的超高交联聚苯乙烯树脂(JN-8)具有亲水性高、对酚类化合物吸附容量大的优点,该树脂可望在高浓度含酚废水治理中得到应用。     

离子交换纤维对红霉素吸附特性的研究

采用自制的弱酸离子交换纤维对红霉素的吸附和洗脱性能进行了研究,考察了温度、酸度及吸附时间等因素对吸附性能的影响.实验结果表明,pH值为7.0时吸附性能最好.离子交换纤维对红霉素的吸附以液膜扩散为主.静态饱和吸附量为1.79×10~5u/g干纤维,等温吸附过程服从Langmuir和Freundlich等温吸附方程.pH值为7.0,流速为5.0ml/min时对红霉素的动态吸附容量为4.54×10~5u/g干纤维.选用0.1mol/L CH_3COONH_4溶液进行洗脱,当洗脱液流速为5.0ml/min,用量为80ml时洗脱率为92.5%.离子交换纤维的吸附量和洗脱率与大孔树脂类似,吸附速率远大于大孔树脂,能再生重复使用,是一种优秀的红霉素吸附材料.     

非苯乙烯型超高交联树脂的修饰及对酚类化合物的吸附

分别通过4,4'-二氯甲基联苯与1,4'-二氟甲基苯的傅克烷基化聚合和胺化反应,制得一类比表面积可达1138 m2/g的胺基吸附树脂新材料.研究表明,这类非苯乙烯型胺基树脂对苯酚、对硝基苯酚的饱和吸附容量分别可达140 mg/g和331 mg/g,明显优于国内外用于酚类吸附的AmberliteXAD-4、H103等吸附...     

Adsorption characteristics of aniline and 4-methylaniline onto bifunctional polymeric adsorbent modified by sulfonic groups

In this paper a new bifunctional polymeric resin (LS-2) was synthesized by introducing sulfonic groups onto the surface of the resin during the post-crossing of chloromethyl low crosslinking macroporous poly-styrene resin, and the comparison of the adsorption properties of LS-2 with Amberlite XAD-4 toward aniline and 4-methylaniline in aqueous solutions was made. The study focuses on the static equilibrium adsorption behaviors, the adsorption thermodynamics, and the column dynamic adsorption and desorption profiles. Freundlich model gives a perfect fitting to the isotherm data. Although the specific surface area of LS-2 is lower than that of Amberlite XAD-4, the adsorbing capacities for these two adsorbates on LS-2 are higher than those on Amberlite XAD-4 within the temperature range 288-318 K, which is contributed to microporous structure and the polar groups on the network of LS-2 resins. The adsorption for aniline or 4-methylaniline on LS-2 was proved to be an endothermic process and increasing temperature was favorable. From the studies on the adsorption thermodynamics, static equilibrium adsorption, and the desorption conditions, an important conclusion can be drawn that the adsorption for aniline or 4-methylaniline on the LS-2 is a coexistence process of physical adsorption and chemical transition.     

HCl浓度对水合氧化铁复合吸附剂P吸附效能的影响

为避免传统水合氧化铁(HFO)负载树脂复合吸附剂制备过程中大量使用HCl对设备防腐、安全及环保带来的问题,优化HFO复合吸附剂的制备工艺方法,改变负载液中HCl浓度制备得到多种HFO复合吸附剂,考察制备得到的HFO复合吸附剂对P的吸附动力学、吸附等温线、初始pH、共存离子影响、解吸再生方法等,评价负载液中HCl浓度对吸附剂吸附效能的影响。结果表明,负载液中HCl浓度由2 mol·L?1降低至0.5 mol·L?1,并不会显著降低HFO复合吸附剂的P吸附容量。HCl浓度为0.5 mol·L?1时制备得到的HFO复合吸附剂对P的最大吸附容量为29.67 mg·g?1,显著高于D201树脂载体(16.39 mg·g?1),其吸附动力学曲线更符合准一级吸附动力学模型,最佳的P吸附pH为6~8,在共存离子Cl?、NO₃?、SO₄2?、CO₃2?浓度为1.0 g·L?1的条件下,吸附剂对P的吸附容量降低31.1%~53.0%。采用5wt%的NaOH溶液能有效实现吸附剂中P的解吸再生。      

Adsorption of trichloroethylene and benzene vapors onto hypercrosslinked polymeric resin

In this research, the adsorption equilibria of trichloroethylene (TCE) and benzene vapors onto hypercrosslinked polymeric resin (NDA201) were investigated by the column adsorption method in the temperature range from 303 to 333 K and pressures up to 8 kPa for TCE, 12 kPa for benzene. The Toth and Dubinin–Astakov (D–A) equations were tested to correlate experimental isotherms, and the experimental data were found to fit well by them. The good fits and characteristic curves of D–A equation provided evidence that a pore-filling phenomenon was involved during the adsorption of TCE and benzene onto NDA-201. Moreover, thermodynamic properties such as the Henry's constant and the isosteric enthalpy of adsorption were calculated. The isosteric enthalpy curves varied with the surface loading for each adsorbate, indicating that the hypercrosslinked polymeric resin has an energetically heterogeneous surface. In addition, a simple mathematic model developed by Yoon and Nelson was applied to investigate the breakthrough behavior on a hypercrosslinked polymeric resin column at 303 K and the calculated breakthrough curves were in high agreement with corresponding experimental data.     

乙酰苯胺修饰的后交联树脂的制备及对香兰素吸附性能

用二氯乙烷为溶剂,用FeCl3为催化剂,使氯球和乙酰苯胺发生Friedel-Crafts反应制得了乙酰苯胺修饰的后交联树脂,详细研究了反应条件对树脂孔结构及对香兰素吸附性能的影响。根据树脂的比表面积、孔容、持水量、氯含量和对香兰素的吸附量等孔结构和性能指标来看,乙酰苯胺修饰的后交联树脂制备的最优条件为：用二氯乙烷为溶剂...     

Influence of the microporosity and surface chemistry of polymeric resins on adsorptive properties toward phenol

In this work, the effects of the microporosity and chemical surface of polymeric adsorbents on adsorptive properties of phenol were investigated. Textural parameters of four kinds of polymeric resins, namely AB-8, D4006, NKA-II and D16 resin, were separately measured by ASAP 2010. The surface chemistry of these polymeric resins was determined by means of inverse gas chromatography (IGC) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Static equilibrium adsorption experiments were carried out to obtain the isotherms of phenol on the polymeric resins. It was shown that NKA-II and AB-8 resin possessed relatively high BET surface areas and micropore volumes, while D4006 and D16 resin possessed comparatively low BET surface areas and micropore volumes. The results of IGC experiments revealed that NKA-II resin had extraordinary high specific component of the free energy of adsorption both for polar acetone and benzene probe, and thus extraordinary strong surface polarity compared to the other polymeric resins. It was also found that the isotherm of phenol on NKA-II was much higher than that on the other polymeric resins due to its strongest surface polarity and largest micropore volume among four kinds of resins. These experimental observations indicated that adsorption of phenol on the polymeric resins depended greatly on their microporosity and surface chemistry. The well-developed microporosity and the strong surface polarity would improve the adsorption of phenol on the polymeric resins.     

氯化氢中的氯气在活性炭上吸附性能的研究

对活性炭吸附氯化氢中的氯气性能做了实验研究。研究结果表明采用活性炭吸附的方法,可以除去氯化氢气体中的氯气,吸附后的尾气中氯气的含量低于10×10-6,满足吸附深度的要求。压力在0.4 MPa、流量控制在400 mL/min时,分别测得了在26、8、-10、-35、-60℃下,每克活性炭吸附氯气的动态吸附量分别为:141.5、172.0、178.0、181.0、185.0 mg。