酚醛型吸附树脂在非水体系中对吡啶和N,N-二甲基苯胺的吸附性能研究

研究了酚醛型吸附树脂JDW 2在非水体系中对吡啶和N ,N 二甲基苯胺的静态吸附 .由实验结果推论正己烷中树脂对吡啶和N ,N 二甲基苯胺的吸附是以氢键吸附机理为主进行的 ,JDW 2酚醛型吸附树脂在正己烷中 ,等温吸附吡啶和N ,N 二甲基苯胺的平衡吸附数据符合Langmuir方程 ,相关系数在 0 99以上 ,因此 ,酚醛型吸附树脂在正己烷中吸附吡啶和N ,N 二甲基苯胺属单分子层吸附 ;同时对非水体系中乙醇或乙酸乙酯的含量对树脂吸附吡啶和N ,N 二甲基苯胺的影响进行了研究     

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.     

Solid phase preconcentration of iron as methylthymol blue complex on naphthalene-tetraoctylammonium bromide adsorbent with subsequent flame atomic absorption determination

A sensitive and selective preconcentration method for the determination of trace amounts of iron by atomic absorption spectrometry has been developed. Iron forms a complex with methylthymol blue at pH=3. This complex is retained by naphthalene tetraoctylammonium bromide adsorbent in a column with a height of about 2 cm. The adsorbed metal complex is then eluted from the column with nitric acid and its iron content is determined by flame atomic absorption spectrometry (FAAS). The effect of different variables such as pH, reagent concentration, flow rate and interfering ions on the recovery of the analyte was investigated. The calibration graph was linear in the range 25-350 ng ml⁻¹ of iron in the initial solution with r=0.9994. The limit of detection based on 3S_b criterion was 12 ng ml⁻¹ and the relative standard deviation for eight replicate measurements of 150 and 300 ng ml⁻¹ of iron was 3.1 and 1.8%, respectively. This procedure was successfully applied to the determination of iron in tap and sewage water samples.     

树脂填充聚醚砜纤维吸附剂对牛血清蛋白吸附性能的研究

重点研究树脂填充聚醚砜(PES)纤维吸附剂与模型蛋白质牛血清蛋白(BSA)之间的吸附与脱附行为.结果表明,蛋白质BSA在树脂填充PES纤维吸附剂中的平衡吸附过程较好地符合朗格缪尔吸附模型,树脂Lewatit CNP80ws填充PES吸附剂的最大吸附容量约为139mg BSA/g吸附剂.表面具有开孔结构的树脂填充PES纤维吸附剂的吸附速率较快,在不同结构纤维吸附剂中BSA的扩散系数在1·82×10-14~8·7×10-14m2/s范围内变化.另外,考察了BSA溶液的pH与洗脱剂等因素对吸附剂吸附与脱附性能的影响,研究结果对蛋白质的实际分离纯化具有重要的参考价值.     

新型络合吸附剂的研究(Ⅳ)──铜(Ⅱ)、镍(Ⅱ)模板高分子多乙烯多胺吸附剂的记忆性

研究了铜(Ⅱ)、镍(Ⅱ)离子模板高分子多乙烯多胺络合吸附剂的动态吸附金属离子的行为。5个周期的动态吸附结果表明,合成的铜(Ⅱ)、镍(Ⅱ)模板吸附剂分别对铜(Ⅱ)和镍(Ⅱ)金属离子具有稳定的吸附能力,其动态饱和吸附量达4.357mmolCu(Ⅱ)/g[铜(Ⅱ)模板吸附剂]、3.153mmolNi(Ⅱ)/g[镍(Ⅱ)模板吸附剂];相对误差分别为±1.5%和±2.2%.     

新型络合吸附剂的研究(Ⅲ)——镍离子模板高分子多乙烯多胺络合吸附剂的合成和特性

以金属Ni(Ⅱ)离子为模板,合成了高分子多乙烯多胺络合吸附剂.研究了它们对重金属离子(Cu²⁺,Ni²⁺,Zn²⁺,Co²⁺的吸附特性.结果表明,这类吸附剂对Cu(Ⅱ)、Ni(Ⅱ),Zn(Ⅱ)、Co(Ⅱ)离子的吸附容量分别达239.60、231.30、131.83、81.23mg/g(千);相应选择性顺序为Cu(Ⅱ)≈Ni(Ⅱ)>Zn(Ⅱ)>Co(Ⅱ).     

碳素基体固相微萃取吸附质的研制

研制了石墨型碳素基体固相微萃取吸附质,并以该新型固相微萃取装置联用气相色谱 电子捕获检测器分析水体中的有机农药。考察了吸附萃取时间及离子强度对分析结果的影响,并与商品装置进行了对比,结果表明其具有很好的应用前景。     

新型亲和吸附剂的研究(Ⅰ)──吸附剂的制备及其配体固定化

以醋酸乙烯酯为单体,三烯丙基异氰尿酸酯为交联剂制得大孔交联共聚物,以其为载体,氨基酸为配体制得一系列亲和吸附剂。探讨了溶剂用量和性质、反应时间和温度等条件对配体固定化的影响,并确定了最佳制备条件。     

纤维素基磁性聚偕胺肟树脂的研究——溴在树脂上的吸附动力学

研究了酸式和碱式纤维素基磁性聚偕胺肟树脂(AMAO,BMAO)对溴的吸附行为.结果表明,吸附速度不但受控于粒内扩散,也受质量作用的影响.BMAO吸溴量与溴浓度有关,符合Freundlich和Langmuir等温吸附方程.溴在树脂上高的摩尔比吸附暗示着吸附后随即进行氧化还原反应,并可能发生连续再吸附.     

纤维素基磁性聚偕胺肟树脂的研究——CuCl2的吸附行为

CuCl₂可吸附在碱式纤维素基磁性聚偕胺肟树脂(BMAO)上.接触20min时F=0.69,n([Cu²⁺]a)/n([AO])=0.59,此后吸附速度突然下降.动力学研究和扫描电镜观察表明,吸附后生成了二齿螯合物,随后进行氧化还原反应析出单质铜.BMAO适于在稀溶液中吸附Cu²⁺离子,也适于进行大规模吸附.