极性后交联吸附树脂的制备及其对水杨酸的吸附

将GMA与DVB悬浮聚合得到了初始共聚物PDG,再通过悬挂双键后交联反应制备出极性后交联树脂PDGpc,并研究了合成树脂对水杨酸的吸附性能。结果表明,后交联后,树脂的BET比表面积和孔容都显著增加,且对水杨酸拥有更高的吸附量。     

大孔吸附树脂吸附乳酸及乳酸与谷氨酸的分离

通过筛选,得到大孔吸附树脂NKA-II,并用其对乳酸进行分离. 测定了该树脂对乳酸与谷氨酸的吸附选择系数,得到了乳酸在NKA-II上的吸附等温线,并对其吸附动力学和动态吸附进行了研究. 结果表明,NKA-II对乳酸和谷氨酸的吸附选择系数KGL=16.19. 该树脂对乳酸的吸附等温线符合Freundlich方程,在26和48℃下的相关系数R2均大于0.99,方程的特征参数n>1,属"优惠吸附". 吸附动力学研究表明,粒内扩散是吸附过程的主要控制步骤,符合Kannan-Sundaram粒内扩散模型,相关系数R2=0.9906,粒内扩散速率常数kp=6.0129 mg×min0.5/g. 动态吸附实验结果表明,乳酸的穿透体积比谷氨酸大110.6 mL,故该树脂可以成功地应用于乳酸与谷氨酸的分离.     

三维有序大孔 Fe/N/TiO2复合型光催化剂制备及光催化性能研究

以一定比例钛酸四丁酯、乙醇、醋酸、硝酸铁、尿素和水配制的溶胶溶液为前驱体,对聚苯乙烯(PS)胶晶模板进行填充固化,并通过煅烧去除模板,得到三维有序大孔(3DOM) Fe/N/TiO2新型复合光催化剂材料.分别在紫外和可见光条件下,利用获得的3DOM Fe/N/TiO2复合光催化剂降解甲基橙有机废水.研究结果表明,3DOM Fe/N/TiO2材料在紫外和可见光条件下均具有良好的光催化降解能力,并且具有良好的再生循环使用能力.     

大孔吸附树脂分离纯化杜仲中京尼平甙酸

比较了NKA-9、D311、S-8、HPD600、NKA-2、A型、D140、聚酰胺8种树脂对杜仲中的降血压活性成分京尼平甙酸(GPA)的吸附及脱附性能,从中筛选出吸附率(88.17%)及脱附率(97.71%)均较高的A型树脂进行实验。最佳工艺条件为:杜仲皮粉末用φ(乙醇)=50%的水溶液提取后,乙醇沉淀,上清液调节pH=6~9后,用A型树脂吸附220 m in,装柱,用φ(乙醇)=15%的水溶液洗脱,流速为1.5 mL/m in,洗脱液浓缩后,冷冻干燥得产品。京尼平甙酸的收率为84.03%,w(GPA)=84.06%。     

D201树脂对水杨酸的吸附热力学与动力学

以D201大孔阴离子交换树脂对水溶液中水杨酸的吸附热力学和动力学特性进行了研究。结果表明:在pH=3~12时,吸附能力最好。等温吸附服从Freundlich经验式。在298~318K条件下,水杨酸吸附量为100~120 mg/g的吸附焓变为-7.38~-5.00 kJ/mol、自由能变为-8.46~-9.37 kJ/mol、吸附熵变为3.62~13.74 J/(K.mol)。吸附动力学符合Lagergren一级速率方程,吸附速率常数为0.0472~0.124/min,吸附活化能为38.1 kJ/mol。颗粒内扩散是速率控制步骤之一,膜扩散也共同影响着吸附过程。303 K下用5%NaCl+2%NaOH溶液可定量洗脱,洗脱率达99%。     

大孔树脂静态吸附10-羟基癸酸特性的研究

文章研究了大孔树脂对10-羟基癸酸的吸附特性,以吸附量和解吸量为指标,考察了不同因素对吸附的影响。正交静态吸附实验结果表明:当10-羟基癸酸的浓度为0.01mol/L,吸附时间为8h,吸附温度为80℃,pH为3时,大孔树脂对10-羟基癸酸的吸附率最大81.03%,并且大孔树脂的重复使用性能较好。     

不溶性腐殖酸对水中六价铬的吸附行为及影响因素研究

研究了不溶性腐殖酸(IHA)对六价铬的吸附作用及影响因素。进行了反应接触时间、pH、IHA投加量、光照条件等对反应的影响研究,确定了最佳反应条件。同时应用未处理的腐殖酸进行对比研究,实验表明在反应接触时间为60min,pH为7的水溶液条件下不溶性腐殖酸对铬离子去除率可达98%,比未处理的腐殖酸对铬离子的去除率提高近一倍,并拟合了不溶性腐殖酸对铬离子的反应动力学曲线和吸附等温线。     

717阴离子交换树脂选择吸附分离水杨酸和苯酚

用717阴离子交换树脂自二元水溶液中选择吸附分离水杨酸和苯酚.采用静态及动态法研究了二元水溶液中树脂对每种吸附质的吸附行为,考察了pH、浓度、时间等对吸附的影响,探讨了等温吸附和吸附动力学特性.结果表明,pH是影响选择吸附分离的主要因素,pH = 4.5时,苯酚的存在几乎不影响水杨酸的吸附;pH = 11时,苯酚能替换...     

Adsorption and Desorption Behavior of Tannic Acid in Aqueous Solution on Polyaniline Adsorbent

Tannic acid is generally considered as one of polyphenolic pollutants, which may cause severe threats to the environment. In this study, polyaniline adsorbent was synthesized by chemical oxidation to remove tannic acid in aqueous solutions. The adsorption amount of tannic acid varied greatly with pH of solution and strong adsorption was at pH 5.8-6.7. Coexisting cations, such as Na⁺, K⁺, and Ca²⁺, can enhance the adsorption of tannic acid on polyaniline, which may be contributed to the electrostatic interaction between tannic acid and polyaniline. The adsorption process could be well described by Langmuir model and the maximum adsorption capacity was 117.65 mg·g^-1 at 35℃ and pH 6.0. The thermodynamic parameters calculated from the adsorption isotherms indicate that the adsorption of tannic acid is spontaneous and endothermic process. The polyaniline saturated with tannic acid can be desorbed in alkaline solution and regenerated adsorbent can be used repeatedly with high adsorption capacity, which implies that polyaniline adsorbents have a great potential in water purification for the removal of tannic acid.     

丙烯酰胺为功能单体制水杨酸分子印迹聚合物

1HNMR实验表明,在弱极性溶剂中,水杨酸与丙烯酰胺之间的氢键作用大于水杨酸与α-甲基丙烯酸之间的氢键作用。据此以丙烯酰胺为功能单体、二甲基丙烯酸乙二醇酯为交联剂,合成了水杨酸分子印迹聚合物。电镜和静态吸附实验表明,选用乙腈做溶剂合成的印迹聚合物疏松多孔、吸附性能较好,而用氯仿做溶剂合成的印迹聚合物致密、吸附性能较差。以丙烯酰胺为功能单体合成的水杨酸分子印迹聚合物分离因子α=7.2,印迹效率因子β=5.1;而以α-甲基丙烯酸为功能单体合成的水杨酸分子印迹聚合物分离因子α=1.7,印迹效率因子β=2.1。     

D354大孔弱碱树脂吸附游离酸的行为研究

利用电导实验技术,跟踪观察D354大孔弱碱离子交换树脂吸附游离酸的行为。利用固—液界面吸附的动力学方程,求取吸附过程吸附质亲和能。讨论酸的浓度和树脂类型对吸附行为的影响。     

超高交联树脂对水溶液中山梨酸的吸附研究

研究了NDA-150超高交联吸附树脂对水溶液中山梨酸的静态吸附行为,探讨了pH值、温度、盐度以及乙醇的含量等因素对山梨酸在NDA-150树脂上吸附的影响。实验结果表明,该树脂对山梨酸的吸附能力明显优于CHA-111和XAD-4树脂,树脂的表面极性和微孔结构在吸附过程中起决定作用。吸附的最佳pH值为3,降低温度有利于吸附,NaCl的存在有利于吸附,乙醇的质量分数大于1%时,吸附量会显著降低。     

Preparation and Characterization of Confined Atactic Polystyrene in Ordered Silica/Polystyrene Composites

Ordered silica/polystyrene composites were prepared via radical polymerization in silica colloidal crystal templates, and ordered macroporous polymers were accordingly obtained after removing the silica templates. The confinement effect of the templates on the polymers in the composites was investigated. NMR results indicated that the polystyrenes formed both inside and outside the template were atactic. The polystyrene inside the template possessed a higher molecular weight and a narrower molecular weight distribution than the bulk one outside the template. The glass transition temperature of the confined polystyrene increased significantly with decreasing silica sphere size of the templates, and so did the contraction of polymer pores. The smaller the silica sphere size of the templates, the more remarkable is the confinement, which could be explained by entropic confinement of the polymer chains within a fixed inorganic meso‐framework (T. P. Russell, Science 2001 , 293, 446).     

硝酸改性花生壳对Pb2+的吸附研究

以花生壳为原料、HNO3为改性剂,对花生壳进行改性制备吸附剂,并研究了其吸附水中Pb2 的性能.结果表明,在2.0 g花生壳中加入体积分数为10%的HNO3溶液25 mL、控制温度80℃、搅拌3 h,得到改性的花生壳;用此改性花生壳吸附Pb2 的最佳条件为:0.20 g改性花生壳、97.5 mg·L-1的Pb2 溶液25 mL、pH值5.0、搅拌吸附60 min,在此条件下吸附率可达97%;吸附后的花生壳用0.5 mol·L-1的HCl溶液再生,重复使用2次对Pb2 的吸附率在92%以上;同时,比较了改性花生壳和未改性花生壳对Pb2 的吸附性能,未改性花生壳对Pb2 的吸附率为87%,改性花生壳对Pb2 的吸附率为96%,通过HNO3改性使花生壳的吸附性能得到提高.     

水溶液中丁醇在树脂上的吸附

水溶液中丁醇在树脂上的吸附杨立荣姚善泾朱自强（浙江大学化工系，杭州３１００２７）焦朝晖（浙江临海制药厂，临海３１７０００）关键词丁醇吸附吸附热力学１前言发酵产物在发酵液中浓度一般在２０～１００（ｇ／Ｌ）之间［１］，如丙酮／丁醇发酵液中总溶剂浓度为１８...     

Adsorption of Levulinic Acid from Aqueous Solution onto Basic Polymeric Adsorbent: Experimental and Modeling Studies

Adsorption of levulinic acid onto a basic polymeric adsorbent was experimentally measured and numerical analyzed by batch and column methods. The adsorption equilibrium was correlated by a highly favorable Toth isotherm. Experimental adsorption rates in batch adsorber were fitted by the pore diffusion model and parallel pore/surface diffusion model. The resultant isotherm equation and diffusion coefficients were incorporated into the general rate model to predict the experimental breakthrough data. The film resistance and the axial dispersion in the column were estimated by Wilson-Geankoplis equation and Chung-Wen equation, respectively. Simulation elucidated that the parallel diffusion model successfully described the breakthrough behaviors and gave a better prediction than the pore diffusion model.     

大孔树脂吸附分离丹参提取液中丹酚酸B的工艺研究

对国内几种大孔吸附树脂的丹酚酸B吸附性能进行了实验筛选。结果表明。YWD06树脂有较好的吸附和洗脱能力;适宜吸附条件：pH值控制在4-5、流速为2BV/h;以70%乙醇为洗脱剂,pH值=5、流速为3BV/h时,洗脱效果好。     

分光光度法检测火药中水杨酸及其衍生物盐的含量

根据在酸性环境中水杨酸根离子和铁离子起显色反应,提出测定火药中的水杨酸及其衍生物盐含量的分光光度法。平均回收率为99．76％(n=11),实验标准偏差为2．10％。该方法的优点是简单、准确。     

Determination of Both Mesopores and Macropores in Three-Dimensional Ordered Porous Materials by Nitrogen Adsorption

Three-dimensionally ordered silica structures containing both mesopores and macropores are created using polystyrene coacervate spheres with a diameter of ca. 146 nm. The close-packed polystyrene coacervate spheres are intercalated with tetraethyl orthosilicate. The spheres are removed by calcination leaving an inverse silica replica with a spherical macropore cavity diameter of 110 nm. Due to the nature of these porous structures, pores leading into the macropore cavity are in the mesopore regime, 40 nm in diameter. The nitrogen adsorption data described in the following paper gives a pore size for both the macropore cavity and the mesopore openings leading into the cavity. The pore sizes as determined by nitrogen sorption are in good agreement with the pore sizes observed by scanning electron microscopy. Mercury intrusion porosimetry results confirm the size of the mesopore openings leading into the macropore cavity, however due to destruction of the sample upon intrusion, extrusion results can not be obtained to determine main cavity diameters. As a result, nitrogen sorption may be a viable option for determining pore sizes with these three-dimensionally ordered materials containing both mesopores and macropores.     

高效液相色谱法测定香精香料中的水杨酸

采用高效液相色谱法,二极管阵列（DAD）检测器,通过DIAMONSILC18柱分析香精香料中的水杨酸含量。试验方法中水杨酸质量浓度在0．2～50mg／L范围内呈线性关系,线性相关系数为0．9997,回收率为96．50％～99．92％,相对标准偏差为0．16％。实验结果表明该法快速、简便,重现性好,适合于香精香料中水杨酸的检测。