几种吸附树脂对硝基化合物吸附性能的研究

研究NJ－8、AM－1、Amberlite XAD-4、JX－101 4种吸附树脂对对硝基苯乙酮和对硝基苯甲酸的静态吸附行为。结果表明：江苏南大戈德环保科技有限公司研制的NJ－8和AM－1两种吸附树脂对硝基化合物的吸附效果较好。并研究NJ－8型吸附树脂的动态吸附和脱附行为，结果显示：NJ－8型吸附树脂对对硝基苯甲酸的吸附容量为128mg/g干树脂，对对硝基苯乙酮的吸附容量为383mg/g干树脂。用8%NaOH:乙醇（体积比1：1）洗脱吸附酸的树脂，用甲醇或乙醇洗脱吸附酮的树脂，体积为5BV时，温度分别为333K和313K，脱附率均接近100％。     

一种亲水的酚羟基修饰聚苯乙烯树脂对酚类化合物的吸附热力学

在283-323K和研究的浓度范围内,苯酚、对甲苯酚、对氯苯酚和对硝基苯酚在亲水性的酚羟基修饰聚苯乙烯树脂（AM-1）与大孔吸附树脂（Amberlite XAD-4)上平衡吸附数据符合Freundlich吸附等温方程。酚类化合物在AM-1上的吸附容量比在Amberlite XAD-4上的吸附容量增加20%以上,这主要得益于AM-1表面的酚羟基入树脂的微孔结构。在较稀的溶液中AM-1对苯酚的吸附量比AmberliteXAD-4对苯酚的吸附量增加60%,表明AM-1对苯酚有特殊的选择性。Freundlich吸附等温线、相对吸附容量以及等量吸附焓表明,四种酚在两种树脂上的吸附是物理吸附过程。对酚类化合物被两种树脂吸附的吸附焓、自由能、吸附熵也作了测试,并对吸附行为作了合理的解释。     

间氨基水杨酸修饰超高交联吸附树脂对酚类化合物的吸附行为

合成间氨基水杨酸修饰的超高交联吸附树脂LZ-01,比较LZ-01树脂与NJ-8树脂对对甲基苯酚和对硝基苯酚的吸附能力,研究LZ-01树脂在不同温度(288K,313K,318K)下吸附水溶液中对甲基苯酚和对硝基苯酚的静态吸附热力学和动力学行为。结果表明,由于LZ-01树脂具有更大的比表面积、更多的微孔且含有氨基、羟基和羧基等基团,使其对对甲基苯酚和对硝基苯酚的吸附量明显高于NJ-8树脂。Freundlich方程对等温吸附数据能够很好地拟合,吸附焓变绝对值小于40kJ/mol,表明吸附是焓驱动的物理吸附过程。LZ-01树脂对对甲基苯酚和对硝基苯酚吸附动力学均符合准一级动力学方程,吸附速率随温度升高而增大,颗粒内扩散是该吸附过程的速控步骤。     

新型吸附树脂对苯乙酸的吸附热力学研究

研究了苯乙酸在新型超高交联树脂AH、NDa-150和大孔吸附树脂(Amberlite XAD-4)上的平衡吸附数据，测定了288K、303K和318K温度下的吸附等温线，结果表明吸附过程符合Langmuir吸附等温方程。苯乙酸在AH、NDa-150上的吸附容量分别比在Amberlite XAD-4上的吸附容量最高高出90％、113％，这主要归因于AH、NDa-150表面的极性基团及树脂的微孔结构．Langmuir吸附等温线、相对吸附容量以及等量吸附焓变表明，苯乙酸在AH树脂上的吸附是物理吸附和化学吸附共同作用的结果．对苯乙酸被3种树脂吸附的吸附焓变、自由能变、吸附熵变也作了计算，并对吸附行为作了合理的解释。     

超高交联吸附树脂对苯甲酸的吸附研究

用新合成的NJ－8超高交联吸附树脂吸附苯甲酸，并与Amberlite XAD-4进行比较。从静态平衡吸附行为及其热力学性质讨论吸附机理。动态穿透吸附实验进一步验证了NJ－8提高交联吸附树脂对苯甲酸的吸附能力约为Amberlite XAD-4的1.6倍。     

不同基团修饰的吸附树脂对芳香两性化合物的吸附等温线研究

研究了带有不同功能基团的超高交联吸附树脂NG-10和NJ-99对水溶液中芳香两性化合物氨基苯甲酸的静态吸附性能,并与不带功能基团的吸附树脂CHA-111和XAD-4进行了比较.研究结果表明,树脂NJ-99对水溶液中氨基苯甲酸的吸附能力高于其他树脂.邻氨基苯甲酸在4种树脂上的吸附量均大于对氨基苯甲酸,主要原因是其溶解度小.吸附等温线采用经验的Freundlich方程和理论的Langmuir吸附方程来拟合,在实验所研究的浓度范围内,方程的拟合相关性均很好.     

树脂吸附法处理对硝基苯乙酮生产废水的研究

本文采用树脂吸附法对对硝基苯乙酮生产废水的处理进行了系统研究，实验结果表明，采用Ｈ－１０３树脂处理，废水中硝基物平均去除率达９８％；酚类去除率达１００％；ＣＯＤｃｒ平均却除率达８９％。采用乙醇作脱附剂，脱附效果良好。     

吸附树脂和络合树脂联合处理对硝基苯乙酮生产废水的研究

本文采用南京大学研制的AM－1型吸附树脂和ND－900型络合树脂联合处理对硝基苯乙酮生产废水，系统地研究了流速、温度、废水的pH值等因素对树脂吸附性能的影响，以及以NaOH为脱附剂，其流速、浓度、温度等对树脂脱附性能的影响。当废水的处理量为30BV时，其CODCr总去队达93％，表明树脂吸附性能良好。     

胺基修饰大孔树脂对腐殖酸的吸附研究

研究了腐殖酸在胺基修饰大孔树脂D-301上的吸附行为,并与胺基修饰超高交联树脂NDA-99和大孔非极性树脂XAD-4作对比,结果表明,带有弱碱性基团的大孔亲水性树脂D-301对腐殖酸的吸附效果优于XAD-4和NDA-99,这主要得益于D-301树脂大孔结构和表面胺基修饰.探讨了溶液pH值和重金属离子对D-301树脂吸附腐殖酸的影响,并对作用机理进行了初步探讨.     

新型胺基修饰的超高交联聚合吸附剂吸附水中酚类化合物的研究

合成了新的胺基修饰的超高交联AH系列吸附树脂．以弱碱树脂D301和超高交联吸附树脂ND100为参照，测定了AH系列吸附树脂吸附水中苯酚、对氯苯酚、对甲苯酚、对硝基苯酚的吸附性能。结果表明：修饰的超高交联吸附树脂对苯酚．对甲苯酚、对氟苯酚的吸附量比ND100和D301更大，而D301树脂对对硝基苯酚有最大的吸附量．提出了AH系列树脂对4种酚类化合物吸附行为的作用机理．     

超高交联树脂对苯胺的吸附机理研究

在静态条件下，研究了水溶液中超高交联树脂AM－1和NJ－8及大孔吸附树脂Amberlite XAD－4吸附苯胺的热力学特性，测定了不同温度下的吸附等温线。结果表明，在稀溶液中3种树脂吸附苯胺都符合Langmuir和Freundlich模型，其中AM－1和NJ－8对苯胺的吸附是一个吸热过程；由于AM－1和NJ－8的微孔结构和表面存在酸性基团的吸附中心，对苯胺的吸附是物理吸附和化学吸附共同作用的结果。     

A WATER-COMPATIBLE PHENOLIC HYDROXYL MODIFIED POLYSTYRENE AS AN ADSORBENT FOR ADSORBING PHENOLIC COMPOUNDS FROM AQUEOUS SOLUTIONS

1. INTRUDUCTION As most phenolic compounds are extremely toxic at the concentrations discharged into accepting effluents, the removal or destruction of phenolic compounds from such streams has become a significant environmental task [1]. Increasing concern for public health and environmental quality has led to the establishment of limits on the acceptable environmental levels of specific pollutants [2]. Consequently there has been a growing interest in developing and implementing various …     

A WATER-COMPATIBLE PHENOLIC HYDROXYL MODIFIED POLYSTYRENE AS AN ADSORBENT FOR ADSORBING PHENOLIC COMPOUNDS FROM AQUEOUS SOLUTIONS

A water-compatible phenolic hydroxyl modified polystyrene adsorbent (AM-1) foradsorbing and removing phenolic compounds from aqueous solutions was prepared by covalent bonding of phenolic hydroxyl groups to the surface of porous polystyrene-divinylbenzene beads, this resin can be used directly without wetting process. A comparison of the sorption properties of the new resin and Amberlite XAD-4 toward four phenolic compounds, phenol, p-cresol, p-chlorophenol,and p-nitrophenol was made. The capacities of equilibrium adsorption of AM-l for all four phenolic compounds increased around 20% over that of Amberlite XAD-4, which may be contributed to phenol hydroxyl group on the surface and the unusual pore distributior. At their dilute solution, the equilibrium adsorption capacities of AM-1 for phenol increased about 62% over that of Amberlite X4D-4, while equilibrium adsorption capacities of the other three phenolic compounds increased 4-35%, suggesting an advantage of AM-I over Amberlite XAD-4 in the collection of phenol.Freundlich isotherm equations and isosteric adsorption enthalpies for the four phenolic compounds indicate a physical adsorption process on the Amberlite XAD-4 and AM-I resins. Column studies for phenol show that AM-1 resin has excellent adsorption and desorption performance.     

ADSORPTION OF BENZOIC ACID AND P-NITROBENZOIC ACID ON A NEW HYPERCROSSLINKED PHENOL GROUP PST ADSORBENT

1.INTRODUCTIONThepolymericadsorbentAmberliteXAD-4isconsideredoneofthemostsuitablepolymericadsorbentsforremovingphenoliccompoundsfromwaterstreams[1,2]becauseitischemicallystable,notsolubleinsolventsandmoreselectiveforaromaticringsduetoitshydrophobicproperties.However,methanol,acetoneoracetonitrile,hastobeusedtoenhancethesurfacecontactbetweenadsorbentandthesolute.DavankovandTsyurupadescribedanewseriesofadsorbents[3,4].Thistechniqueyieldedpolystyrenesorbentsofunusualhypercrosslinkedstructu…     

超高交联树脂对苯胺和对硝基苯胺的吸附行为

吸附热力学;化学吸附;超高交联树脂对苯胺和对硝基苯胺的吸附行为     

THERMODYNAMIC STUDY OF ADSORPTION OF PHENOLIC COMPOUNDS FROM AQUEOUS SOLUTION BY A WATER-COMPATIBLE HYPERCROSSLINKED POLYMERIC ADSORBENT

Equilibrium data for the adsorption of phenolic compounds, i.e., phenol, p-cresol, p-chlorophenol and p-nitrophenol from aqueous solutions by a water-compatible hypercrosslinked polymeric adsorbent (NJ-8) within temperature range of 283-323 K were obtained and correlated with a Freundlich-type of isotherm equation, so that equilibrium constants KF and n were obtained. The capacities of equilibrium adsorption for all the four phenolic compounds on the NJ-8 from aqueous solutions are around 2 times as high as those of Amberlite XAD-4, which may be attributed to the unusual micropore structure and the partial polarity on the network. The values of the enthalpy (always negative) are indicative of an exothermic process, which manifests the adsorption of all the four phenolic compounds on the two polymeric adsorbents to be a process of physical adsorption. The negative values of free energy change show that the solute is more concentrated on the adsorbent than in the bulk solution. The absolute free energy values of adsorption for NJ-8 are always higher than those for Amberlite XAD-4, which indicates that phenolic compounds are preferentially adsorbed on NJ-8. The negative values of the adsorption entropy are consistent with the restricted mobilities of adsorbed molecules of phenolic compounds as compared with the molecules in solution. The adsorption entropy values of phenolic compounds for NJ-8 are lower than those for Amberlite XAD-4, which means the micropores of NJ-8 require more orderly arranged adsorbate.     

ADSORPTION OF BENZOIC ACID AND P-NITROBENZOIC ACID ON A NEW HYPERCROSSLINKED PHENOL GROUP PST ADSORBENT

A comparison of the adsorption of benzoic acid and p-nitrobenzoic acid on the new hypercrosslinked polymeric adsorbent AM-I, with that by macroporous Amberlite XAD-4, including the equilibrium adsorption isotherms, the dynamic adsorption behaviors through column and the adsorption thermodynamics were studied. Results show that Freundlich equation gives a fitting adsorption isotherm. The specific surface of AM-l is only 67% of that of Amberlite XAD-4, but the adsorption capacities on AM-1 are much higher about 125%～166% than that on Amberlite XAD-4,which is contributed to the micropore mechanism and polarity. The negative values of the adsorption enthalpy are indicative of an exothermic process. Enthalpy and free energy changes of adsorption both manifest a physic-sorption process. The negative values of the adsorption entropy indicate that the adsorption is well consistent with the restricted mobilities and the configurations of the adsorbed benzoic acid molecules on the surface of studied adsorbents with superficial heterogeneity. Both adsorbents were used in mini-column experiments for adsorbing benzoic acid expecting to elucidate the higher breakthrough adsorption capacity of the new hypercrosslinked polymeric adsorbent AM-1 as compared with that of Amberlite XAD-4.     

A WATER—COMPATIBLE PHENOLIC HYDROXYL ODIFIED POLYSTYRENE AS AN ADSORBENT FOR ADSORBING PHENOLIC COMPOUNDS FROM AQUEOUS SOLUTIONS

A water-compatible phenolic hydroxyl modified polystyrene adsorbent (AM-1) for adsorbing and removing phenolic compounds from aqueous solutions was prepared by covalent bonding of phenolic hydroxyl groups to the surface of porous polystyrene-divinylbenzene beads,this resin can be used directly without wetting process.A comparison of the sorption properites of the new resin and Amberlite XAD-4 toward four phenolic compounds,phenol,p-cresol,p-chlorophenol,and p-nitrophenol was made.The capacities of equilibrium adsorption of AM-1 for all four phenolic compounds increased around 20% over that of Amberlite XAD-4,which may be contributed to pheonl hydroxyl group on the surface and the unusual poe distribution.At their dilute solution,the equilibrium adsorption capacities of AM-1 for phenol increased aout 62% over that of Amberlite XAD-4,while equilibrium adsorption capacities of the other three phenolic compounds increased 4-35%,suggesting an advantage of AM-1 over Amberlite XAD-4 in the collection of phenol.Freundlich isotherm equations and isosteric adsorption enthalpies for the four phenolic compunds indicate a physical adsorption process on the Amberlite XAD-4 and AM-1 resins,Column studies for phenol show that AM-1 resin has excellent adsorption and desorption performance.