化学修饰的吸附树脂对2,4,6-三氯苯酚的吸附研究

合成了用邻羧基苯甲酰基或苯甲酰基修饰的新型聚苯乙烯-二乙烯苯吸附树脂ZH-01, ZH-02和ZH-03, 利用瓶点法研究了它们和Amberlite XAD-4对288～318 K下水溶液中2,4,6-三氯苯酚的静态吸附和静态脱附特征以证实吸附质与吸附剂之间存在化学吸附, 并利用半经验分子轨道法(AM1)计算的几种吸附剂和2,4,6-三氯苯酚的前线轨道近似能级进行了解释. 结果表明: 经邻羧基苯甲酰基或苯甲酰基化学修饰后的树脂ZH-01, ZH-02和ZH-03对水溶液中2,4,6-三氯苯酚的吸附过程在合适温度时会使酚羟基和吸附剂表面的羰基发生作用, 对吸附剂进行适当的化学修饰后, 对2,4,6-三氯苯酚的穿透吸附容量均为Amberlite XAD-4树脂的150%, 饱和吸附容量是Amberlite XAD-4树脂的114％～128％.     

ZK-1树脂对对甲基苯胺工业废水的柱吸附研究

选择NDA-150与ZK-01树脂作为吸附剂,以工业对甲基苯胺废水为研究对象,进行了树脂柱吸附废水的研究.工业对甲基苯胺废水中,对甲基苯胺含量为5300mg/L,吸附过程中,流量为1BV/h,温度为303K,NDA-150与ZK-01树脂分别吸附处理废水12BV、19BV时,废水中对甲基苯胺去除率为约98%.实验结果表明,ZK-01树脂吸附处理对甲基苯胺废水能力强于NDA-150,这是由于ZK-01树脂骨架上键联的弱酸基团与氨基生成酸碱络合物的结果.通过分析ZK-1树脂吸附-脱附处理对甲基苯胺废水的稳定性试验与脱附所得回收物质鉴定,ZK-1树脂具有运行稳定与回收物质可利用的特点.     

丝氨酸改性壳聚糖的合成及其对铀的吸附研究

本文利用丝氨酸对壳聚糖进行改性,再用戊二醛对改性壳聚糖进行交联,合成了丝氨酸改性壳聚糖树脂.研究了该树脂对铀的吸附等温线,吸附动力学,去除率和重复性.结果表明,该树脂对铀具有很好的吸附性能,当铀浓度在80 μg/ml 时该树脂对铀的吸附在3h达到平衡,吸附量达55.87 mg/g,去除率达90%以上,重复性能良好,是较好的吸附废水中铀的吸附剂.     

树脂吸附法处理高浓度DSD酸氧化工序生产废水的研究

本文采用大孔吸附树脂固定床工艺处理DSD酸氧化工序生产废水。实验结果表明，ND804大孔吸附树脂对该废水具有良好的吸附－脱附效果，废水经ND804树脂吸附处理后，CODCr由14790mg/L降至1300mg/L左右，COD去除率约为91％，并可回收纯度达80％的DNS酸，废水在得到有效治理的同时实现了废物的资源化。     

乙酰苯胺修饰的吸附树脂对苯酚和对氯苯酚的吸附研究

通过Friedel-Crafts后交联及化学修饰反应,合成了乙酰苯胺基修饰的超高交联吸附树脂ZH-05,通过红外光谱(IR)和比表面及孔径分析(BET)对其结构进行表征.以Amberlite XAD-4树脂作为参照,通过等温吸附实验和吸附动力学实验探讨了ZH-05树脂对水溶液中苯酚和对氯苯酚的吸附性能和机理.结果表明,与XAD-4树脂相比,ZH-05树脂对苯酚和对氯苯酚均具有更佳的吸附性能.Langmuir和Freundlich方程均能较好拟合ZH-05树脂对苯酚和对氯苯酚的吸附等温线.ZH-05树脂对苯酚和对氯苯酚的吸附以焓推动的自发物理吸附过程为主,吸附过程放热;吸附符合准一级动力学吸附方程,颗粒内扩散是吸附过程的主要控制步骤.     

大孔吸附树脂处理含磺胺废水的研究

利用大孔吸附树脂处理含磺胺废水。实验表明，DRHⅢ树脂对磺胺具有良好的吸附－解吸效果。原废水中磺胺浓度约为17.2g/L,COD约为13750mg/L，经树脂吸附处理后，废水中COD去除率约86％，磺胺的吸附率88．2％，树脂的解吸率为97．5％，磺胺的回收率约86．0％，其纯度达99．8％。在废水有效处理的同时实现了废物资源化，具有良好的环境效益和较高的经济效益。     

大孔树脂对对硝基苯胺的吸附行为及其应用研究

研究了溶液中无机盐、pH值对氨基修饰超高交联大孔树脂NDA-99、氧修饰超高交联大孔树脂NDA-150和大孔树脂XAD-4吸附对硝基苯胺的影响。结果表明,无机盐对吸附影响不大;NDA-99、NDA-150在中性范围吸附量最大,XAD-4的吸附量随pH增大而增大;3种树脂的吸附等温线都能很好的利用Freundlich方程进行拟合,吸附皆为放热反应且为优惠吸附;3种树脂的饱和吸附量大小依次为NDA-150>NDA-99>XAD-4。依据上述结论,采用NDA-150处理对硝基苯胺生产母液废水,每批次处理量为40BV,废水中对硝基苯胺浓度由2130mg/L降至9.6mg/L,去除率达99.5%,吸附后的树脂采用95%的乙醇可完全再生,高浓度对硝基苯胺乙醇再生溶液经蒸馏可回收对硝基苯胺和脱附剂,实现了废水治理与资源化的统一。     

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。     

树脂吸附法处理硝基氯苯生产废水研究

本文研究了树脂吸附法处理硝基氯苯废水的工艺条件。实验结果表明，采用Ｈ－１０３吸附树脂处理该生产废水，硝基氯苯的去除率和ＣＯＤｃｒ去除率达９５％以上，用醇－碱混合液进行脱附，树脂脱附再生性能良好。     

邻硝基苯甲醚生产废水预处理工艺的研究

采用"酸化-树脂吸附"法对邻硝基苯甲醚生产废水进行预处理研究。比较了XAD-4、NDA-88、NDA-99、NDA-150几种树脂对酸化后废水中邻硝基苯酚的静态吸附行为,并选用吸附量较大的NDA-150树脂对该废水进行了吸附及脱附研究。结果表明,pH为4时,NDA-150树脂的平衡吸附量4.38mmol/g。动态吸附处理量为40BV(树脂体积)时,酚去除率95%,以8%NaOH为脱附剂,温度333K,脱附率98%。该工艺CODCr总去除率92%,邻硝基苯酚总去除率99%,每升废水可回收邻硝基苯酚10.8g,纯度大于97%。     

ADSORPTION CHARACTERISTICS OF CHLOROPHENOLS FROM AQUATIC SYSTEMS BY HYPERCROSSLINKED RESINS MODIFIED WITH BENZOYL GROUP

A hypercrosslinked polymeric adsorbent （ZH-03） for adsorbing and removing chlorophenolic compounds from their aqueous solutions was studied, including the static adsorption. The equilibrium adsorption data were fit to Freundlich adsorption isothermic models to evaluate the model parameters. Thermodynamic studies on the adsorption of chlorophenolic compounds on ZH-03 indicated that there were chemisorption transitions for 2,4,6-trichlorophenol and physical adsorption processes for 2-chlorophenol and 2,6-chlorophenol, and ZH-03 showed the homogeneous nature of the adsorbent surface. Column adsorption for chlorophenols wastewater shows the advantages of the ZH-03 adsorbent for adsorbing the following chlorophenolic compounds as 2-chlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol. Sodium hydroxide was used for desorpting chlorophenols from ZH-03 and showed excellent performance.     

THE ADSORPTION BEHAVIORS OF 2,6-DICHLOROPHENOL ONTO HYPERCROSSLINKED RESINS

Experimental investigations were conducted on the adsorption characteristics of 2,6-dichlorophenol by two hypercrosslinked resin, ZH-01 and XAD-4. The static adsorption was studied. Within temperature range of 288K～313K, the equilibrium adsorption date was fitted to freundlich adsorption isotherm models to evaluate the model parameters. The enthalpies, free energy,entropy were indicative of an exothermic, a spontaneous and disorder decreasing process. The magnitudes for 2,6-dichlorophenol on ZH-01 showed a chemisorption's transitions while on XAD-4shows a physical adsorption process. The results showed that the ZH-01 adsorbents were better than the Amberlite XAD-4 for removing the 2,6-dichlorophenol in aqueous solutions.     

Adsorption behavior of phenolic compounds onto polymeric adsorbents modified with 2-carboxybenzoyl groups

<正>Two hypercrosslinked polymeric adsorbents(ZH-01 and Amberlite XAD-4 resin) were employed to remove three kinds of phenolic compounds including phenol,4-nitrophenol and 2,4-dinitrophenol from aqueous solutions.The study was focused on the static equilibrium adsorption behavior,the column dynamic adsorption and desorption profiles.The Freundlich model gave a perfect fitting to the isotherm data.The adsorbing capacities for these three compounds on ZH-01 were higher than those on Amberlite XAD-4 within the temperature range 288-318 K,which was attributed to the large micropore area and 2-carboxybenzoyl functional groups on the network of ZH-01 resin.The adsorption for phenol and 4- nitrophenol on ZH-01 was a physical adsorption process,while for 2,4-dinitrophenol it was a coexistence process of physical adsorption and chemisorption's transitions.The column test showed the advantages of ZH-01 in the dynamic adsorption processes of phenolic compounds.Being used as the desorption reagent,sodium hydroxide solution showed an excellent performance.     

ADSORPTION OF CHLOROFORM AND TRICHLOROETHYLENE IN WATER WITH A NEW KIND OF HYPERCROSSLINKED RESINS

In this paper two newly developed hypercrosslinked resins were used to treat micropolluted drinking water and their static and kinetic adsorption were investigated at 293 K. The results show that these two adsorbents are superior to Amberlite XAD-4 for removing chloroform and trichloroethylene in aqueous solutions. The breakthrough capacity and the total capacities from mini-column adsorption studies for chloroform and trichloroethylene on XAD-4, ZH-01 and ZH-00 are calculated respectively under experimental conditions     

苯甲酰基修饰的吸附树脂对对甲苯胺的吸附机理研究

合成了用苯甲酰基修饰的新型吸附树脂ZH-03和ZH-04,同时研究了它们和AmberliteXAD-4对不同温度下水溶液中对甲苯胺的静态吸附和脱附性能,并对吸附机理进行了探讨。结果表明,经化学修饰后的树脂ZH-03和ZH-04对水溶液中对甲苯胺的吸附过程在合适温度时存在化学络合吸附作用,对吸附剂进行苯甲酰基修饰可以提高吸附剂对水溶液中对甲苯胺的吸附容量。     

新型吸附树脂对水中苯的吸附行为

研究表明,苯对人的毒性作用表现在中枢神经系统,65g／m^3的苯可引起广泛的出血导致死亡。反复暴露的低浓度苯主要对血液及造血组织产生毒性作用。根据苯吸入致白血病的流行病学研究数据,采用定量外推法计算出饮用水苯质量浓度为0．01mg/L时终身患癌的超额危险度为10^-5,因此饮用水中的苯的限值为0．01mg／L。因此,有效去除饮水中的苯具有重要的意义。     

ADSORPTION OF 2,4-DICHLOROPHENOL IN AQUEOUS SOLUTION ONTO ADSORPTION RESIN MODIFIED BY N-ACETYLANILINE

A hypercrosslinked adsorption resin （ZH-05） modified by N-acetylaniline in the post crosslinking process was prepared. The adsorption properties of ZH-05 toward 2,4-dichlorophenol in comparison with granular activated carbon （GAC） and Amberlite XAD-4 were observed. The present study mainly focuses on the static equilibrium adsorption behaviors, desorption profiles and the proof of chemisorption. The results show that the Langmuir equation can give a perfect fitting to experimental data, and high temperature was favorable for adsorption of 2,4-dichlorophenol on ZH-05. A related equation was used to correlate the amount of chemisorption and the suppositionai chemisorption equilibrium concentration of adsorbate in aqueous solution. The adsorption capacities from different ranges of temperature and the static desorption experiment both reveal the same conclusion, i.e., the adsorption of 2,4-dichlorophenol from water on ZH-05 is a coexistent process of physical adsorption and chemical transition as on GAC.     

ADSORPTION OF 4-METHYLANILINE IN AQUEOUS SOLUTION BY BENZOYL-CONTAINING POLYMERIC ADSORBENTS

New polymeric adsorbents (ZH-02, ZH-03) containing benzoyl group for adsorbing and removing 4-methylaniline from its aqueous solutions were prepared. Studies on the isotherms and the comparison of desorption conditions evidenced through the adsorption of 4-methylaniline in water onto ZH-02 and ZH-03, namely that there are chemisorption‘s transitions at a proper higher temperature. Mini-colunm adsorption studies of 4-methylaniline on XAD-4, ZH-02 and ZH-03 at 288 K show that the breakthrough capacities are 2.39, 2.99 and 3.19 mmol/g and the total capacities are 3.45, 3.92 and 4.35 mmol/g, respectively.