树脂吸附法豆腐柴叶果胶提取液脱色的研究 (Ⅰ) D3520树脂对色素的吸附性能

以大孔吸附树脂D3520对豆腐柴叶色素的吸附行为为研究对象,对色素的吸附平衡和吸附动力学进行研究,以Langmuir公式拟合25℃下的吸附等温线,结果表明:D3520树脂对色素吸附规律较好的符合Langmuir吸附等温式。     

氧化钴／吸附树脂催化剂在对甲酚氧化反应中的催化性能研究

本文研究了吸附树脂D3520负载的氧化钴催化剂对甲酚氧化反应中的催化性能。结果表明:该催化剂具有良好的活性和选择性;甲醇为反应的良溶剂;D3520载体对活性组份具有良好的吸附性能,延长了催化剂的使用寿命。     

聚乙烯吡啶树脂对富马酸的吸附性能研究

通过静态吸附实验,研究了聚乙烯吡啶树脂(PVP)对富马酸的吸附性能。结果表明,该树脂对富马酸的吸附等温线同时满足Langmuir和Freundlich等温吸附方程;在无机盐存在下,与大孔强碱性树脂D204、弱碱树脂D308相比,PVP吸附富马酸的性能几乎不受无机盐的影响。D204树脂吸附富马酸是离子交换作用,D308树脂通过Lewis作用和静电作用吸附富马酸,而PVP树脂对富马酸的吸附行为是氢键所致,吸附为放热过程且能够自发进行。     

牛磺酸在大孔吸附树脂上的吸附-解吸行为研究

本文研究了S－8、D4020、NKA2、AB-8、D4006、NKA9、D3520、X－5等国产树脂对牛磺酸的吸附行为．S－8和D4020对牛磺酸的吸附能力较强,静态吸附容量在12mg／g以上．实验测定了28℃时牛磺酸在S－8和D4020上的吸附等温线,并研究了pH、盐析效应和温度对牛磺酸在S－8和D4020上吸附的影响,结果表明,温度对吸附影响很大．用80℃去离子水对吸附在树脂上的牛磺酸进行解吸,解吸率可达90％以上．     

血竭总黄酮在大孔树脂上的吸附行为研究

以静态和动态两种方式研究了D101大孔树脂对血竭总黄酮的吸附情况,对静态吸附曲线和动态穿透曲线进行了数学拟合,并计算了静态吸附的热力学参数,结果表明:(1)D101树脂对血竭总黄酮的吸附等温线能用Langmuir方程和Freundlich方程较好的拟合,外加KCi或NaCl能提高D101树脂对血竭总黄酮的吸附容量;(2...     

以弱碱性树脂吸附2-萘磺酸/硫酸混合液相平衡研究

研究考察了β－萘磺酸（NSA）和硫酸在弱碱性D301R树脂上的单组分、双组分吸附行为。研究表明，硫酸在D301R树脂上的吸附容量远大于NSA。分别采用Langmuir和Freundlich模型对单组分试验数据进行了拟合。以多组分吸附IAST模型和Langmuir、Freundlich模型预测了硫酸、NSA在弱碱性D301R树脂上竞争吸附相平衡，模型与试验结果吻合的较好，该模型可较准确地预测双组分的竞争吸附行为。     

Pd—Sn／吸附树脂催化剂上对硝基氯苯选择加氢的研究

本文研究了大孔聚苯乙烯系吸附树脂D3520负载的钯-锡催化剂氢化对硝基氯苯的性能及动力学，并对催化剂作了表征。SnO引入有良好的助催化作用。Pd／Sn原子比为0．8时，催化活性较Pd／D3520高50％，选择性为95％，较Pd／D3520提高21．6％。可认为反应速度对底物浓度有一极大值，可能为L-H机理。反应为双分子吸附的表面反应。     

黄姜黄色素在大孔树脂上的吸附动力学研究

采用静态法考察了8种大孔吸附树脂对黄姜黄色素的吸附及解吸特性,筛选出LX-18G树脂具有较高的吸附选择性和良好的脱附性能.以LX-18G树脂对黄姜色素的吸附平衡和吸附动力学进行了深入探讨,测定了不同温度下黄姜色素在该树脂上的吸附等温线,以及不同温度,初始液浓度和转速下的吸附动力学曲线.结果表明,Langmuir方程可更好地描述黄姜色素在该树脂上的吸附平衡.吸附动力学规律可用二级速率方程表示,液膜扩散和颗粒内扩散分别是吸附初期和吸附后期的主要速率控制步骤,吸附活化能为5.37kJ/mol.     

树脂吸附法豆腐柴叶果胶提取液脱色的研究(II) 动态法脱色的适宜条件

考察了6种不同树脂对豆腐柴果胶提取液的脱色作用.详细地研究了吸附工艺条件对树脂脱色能力的影响.试验结果表明,在pH为2.0和温度为25℃下,以0.34BV/min流速进行吸附时,D3520树脂对豆腐柴果胶提取液具有良好的脱色效果;并对树脂再生的条件进行了较详细的研究.     

大孔吸附树脂分离纯化荔枝核黄酮类化合物的研究

比较了D101、D3520、NKAII、AB-8、X-5、HPD-100、HPD-300、HPD-600等8种大孔吸附树脂对荔枝核中抗乙肝活性成分黄酮类化合物的吸附及解吸性能,筛选出效果较好的HPD-300树脂进行分离纯化实验研究。实验表明,HPD-300树脂能够有效地吸附和解吸荔枝核黄酮类化合物,并确定了最佳的吸附和解吸工艺参数。采用最佳的工艺条件分离纯化荔枝核黄酮类化合物,黄酮类化合物的含量由31%提高到82%。     

On the Applicability of the Langmuir Equation to Estimation of Adsorption Equilibrium Constants on a Powdered Solid from Aqueous Solution

The Langmuir adsorption equation has become popular for summarizing solution-solid adsorption data and estimating adsorption equilibrium constants. The applicability of the Langmuir equation to estimation of adsorption equilibrium constants at solid-aqueous solution interfaces was theoretically examined in terms of (1) comparisons of solid-solution adsorption with solid-gas adsorption, (2) deductions of the Langmuir mathematical expression for the nonelectrolyte/solvent exchange, the phase exchange, the ion exchange, and the simple association reactions, and (3) the fitting procedure. The restrictive assumptions underlying the Langmuir equation for solid-gas adsorption may not be valid for adsorption of solute of small molecules or ions by a powdered solid surface from the aqueous solution phase. The fit of adsorption data to the Langmuir mathematical expression cannot be ascertained solely by the linearity of the commonly used equilibrium concentration/amount adsorbed versus the equilibrium concentration plot and does not provide the actual mechanism of the loss of small molecules or ions from aqueous solution. Therefore, the parameters of fitting to the Langmuir mathematical expression may not provide an unambiguous chemical meaning. In addition, we attempt to bring attention to the importance of the standard states of surface phase and solution phase. Copyright 2000 Academic Press.     

奥美拉唑对映体在自制手性柱上吸附等温线的测定

采用吸附-脱附法研究了奥美拉唑对映体在自制的纤维素三苯基氨基甲酸酯涂敷型手性柱上的吸附性能,并用Langmuir方程拟合出吸附平衡方程.当样品浓度降低时,Langmuir方程退化为直线关系,直线斜率即为吸附平衡常数.这一吸附平衡常数与从脉冲色谱流出曲线求得的吸附平衡常数相等,表明吸附-脱附法测得的吸附平衡关系准确,Langmuir方程能描述这一吸附平衡关系.     

Mechanism and equilibrium modeling of Re and Mo adsorption on a gel type strong base anion resin

A static-batch technique was used to demonstrate the adsorption behavior of Re (VII) and Mo ions onto Dowex 21K at equilibrium in single and binary component systems. The single equilibrium adsorption data were modeled through a linear form of four widely used equilibrium isotherm equations. The results indicated that Freundlich and D-R models for Re, and Temkin and D–R isotherms for Mo fitted the obtained data satisfactorily. Binary adsorptions of Re and Mo ions onto Dowex 21K were also analyzed using Extended Langmuir, Modified Langmuir, Extended Freundlich and Langmuir–Freundlich models. The competitive Extended Freundlich model fitted the binary adsorption equilibrium data adequately. Studies on mutual interference effects of Mo ions on Re adsorption capacity indicated that the adsorption of perrhenate ions is always suppressed. In this perspective, the results from EDX studies confirmed the rhenium atom decrease in the simulated Re–Mo adsorption. However, under the studied conditions the affinity of the Dowex 21K for rhenium ions is marginally greater than that of molybdenum ions.     

混合二甲苯吸附平衡的测定与关联

用静态法测定了液相二甲苯在三种沸石分子筛上的吸附平衡，借助汽液平衡模型将液相吸附平衡的关联转化为气相吸附平衡问题，转化后的气相吸附平衡能较好地符合Langmuir等温式。     

Oxalic acid removal from wastewater using multi-walled carbon nanotubes: Kinetic and equilibrium analysis

Oxalic acid adsorption from aqueous solution is studied in this work. Multi-walled carbon nanotubes (MWCNT) were used as an adsorbent. The investigated adsorption variables are equilibrium time, initial acid concentration, and temperature. The experimental results were presented using equilibrium isotherm and kinetic models. The used equilibrium models are Langmuir, Freundlich, and Temkin adsorption isotherms. And the kinetic models are Elovich, Lagergren pseudo-first-order and pseudo-second-order kinetic models. The thermodynamics studies were carried out at three different temperatures: 278, 298, and 318 K. Langmuir isotherm was the best fitted equilibrium model for the experimental data. The all applied kinetic models fitted the data suitably.     

3-氨基苯硼酸为功能单体在壳聚糖上印迹牛血清白蛋白的研究

以壳聚糖为载体, 3-氨基苯硼酸为功能单体对牛血清白蛋白进行了分子印迹的研究, 并对吸附过程进行Langmuir等温吸附模型的数据处理. 结果表明, 印迹聚合物上形成了对于模板分子有较高的吸附容量和选择性的识别位点, Langmuir等温吸附平衡常数为49.5 mL/mg, 结合位点的最大表观结合量为16.3 mg/g, 证明了该印迹聚合物对于牛血红蛋白和溶菌酶这些非模板蛋白的吸附不具有选择性.     

2-chlorophenol sorption from aqueous solution using granular activated carbon and polymeric adsorbents

Adsorption equilibrium and kinetics of 2-chlorophenol (2-CP) one of the chlorophenols (CPs) onto bituminous coal based Filtrasorb-400 grade granular activated carbon and three different types of polymeric adsorbents were studied in aqueous solution in a batch system. Langmuir isotherm models were applied to experimental equilibrium data of 2-CP adsorption. Equilibrium data fitted very well to the Langmuir equilibrium models of 2-CP. Adsorbent monolayer capacity Q Langmuir constant b and adsorption rate constants k _a were evaluated. 2-CP adsorption using GAC is very rapid in the first hour of contact where 70–80% of the adsorbate is removed by GAC followed by a slow approach to equilibrium. Whereas in case of polymeric adsorbents 60–65% of the adsorbate is removed in the first 30 min which is then followed by a slow approach to equilibrium. The order of adsorption of 2-CP on different adsorbents used in the study is found to be in following order: F-400 > XAD-1180 > XAD-4 > XAD-7HP.     

N-Octyl Quaternized P4VP Interaction With Orange Telon

The removal of orange Telon from aqueous solutions by poly(N-octyl-4-vinylpyridiniumbromide) copolymer was investigated. Batch adsorption experiments were carried out to study the effect of experimental parameters on the orange Telon adsorption equilibrium. The adsorption characteristics of copolymer to ward orange Telon in dilute aqueous solution were followed using UV-Vis spectrophotometry. Adsorption equilibrium was reached within 60 min for 0.03 g of poly(4-vinylpyridine quaternized at 58%. The kinetic of adsorption is best described by a pseudo-second-order model. Results also showed that the equilibrium modeling of orange Telon removal process was described by Langmuir isotherms. The maximum adsorption capacity determined from the Langmuir isotherm was 76.4 mg g^{? 1}. The study of the thermodynamic parameters showed that the adsorption of orange Telon on copolymer is an exothermic process and the randomness decreases at the solid-solution interface during the adsorption of dye on the copolymer.     

Adsorption of indole and 2-methylindole on ligand-exchange matrix

The adsorption of indole and its 2-methyl derivative from aqueous solutions onto cobalt(II)-carboxylated diaminoethane sporopollenin (CDAE-sporopollenin) was studied using a fixed-bed column at 25+/-0.1 degrees C. Minicolumn adsorption studies showed that the breakthrough and the total adsorption capacities of CDAE-sporopollenin in the concentration range we have studied increased with increasing external ligand concentration. The characteristics of the adsorption process were investigated using Scatchard plot analysis, where the equilibrium binding data for indole on ligand exchanger gave rise to a linear plot. However, for 2-methylindole, divergence from the Scatchard plot was evident, consistent with the participation of secondary equilibrium effects in the adsorption process. The adsorption behaviors of ligands on CDAE-sporopollenin were expressed by both the Langmuir and Freundlich isotherms. The adsorption isotherm data for these ligands on the resin can be satisfactorily fitted to the Freundlich isotherm within the concentration range studied. However, in the case of 2-methylindole, the experimental data did not fit the Langmuir model, especially when a high ligand concentration range is used; this is probably due to the nonspecific interactions between the ligand exchange matrix and the methyl group present. Ligand adsorption constants and correlation coefficients for the ligands were calculated from the Langmuir and Freundlich isotherms.     

Adsorption of Basic Yellow 28 from aqueous solutions with clinoptilolite and amberlite

The objective of this study was to investigate the adsorption of Basic Yellow 28 that is a cationic dye on clinoptilolite and amberlite XAD-4. Both equilibrium and batch rate adsorption in aqueous solutions of the dyestuff were investigated. Adsorption rate data were analysed using the pseudo-first order kinetic model of Lagergren and the pseudo-second order model to determine adsorption rate constants at 20, 30 and 40 degrees C. The adsorption equilibrium data were analysed using various adsorption isotherm models and the results have shown that adsorption behaviour of Basic Yellow 28 by clinoptilolite and amberlite could be described by either Langmuir or Freundlich models. Langmuir adsorption isotherm constants corresponding to adsorption capacity, Q(0), were found to be 59.6, 52.9 and 56.7 mg/g for clinoptilolite at 20, 30 and 40 degrees C, respectively. Lower adsorption capacities for Basic Yellow 28 on amberlite were obtained. The increase of adsorption rate constants with an increase in temperature for BY 28 adsorption on amberlite indicated chemisorption with dissociation and increased availability of sites due to higher penetration of adsorbing molecules into the pores.