氨基磷酸树脂对铅的吸附性能及机理

研究了Pb2+在氨基膦酸树脂上的吸附行为, 结果表明 树脂的静态饱和吸附容量为822mg/g; 用0.5mol/L的HCl和0.2～0.3mol/L的EDTA洗脱, 洗脱率分别为97%和99%以上. 测得吸附热力学参数分别为 ΔH=9.04kJ/mol, ΔG=-3.99kJ/mol, ΔS=43.7J/(mol*K). 等温吸附服从Freundlich经验式; 表观活化能Ea=13.8kJ/mol; 表观速率常数k298=2.28×10-5s-1; 树脂功能基与Pb2+的配位比为2∶3. 用化学和红外光谱的方法探讨了树脂对Pb2+的吸附机理.     

氨基膦酸树脂对铅的吸附性能及机理

研究了Pb2 在氨基膦酸树脂上的吸附行为 ,结果表明 :树脂的静态饱和吸附容量为 82 2mg/ g ;用 0 .5mol/L的HCl和 0 .2～ 0 .3mol/L的EDTA洗脱 ,洗脱率分别为 97%和 99%以上。测得吸附热力学参数分别为 :ΔH =9.0 4kJ/mol,ΔG =- 3.99kJ/mol,ΔS =43.7J/ (mol·K)。等温吸附服从Freundlich经验式 ;表观活化能Ea=13.8kJ/mol;表观速率常数k2 98=2 .2 8× 10 -5s-1;树脂功能基与Pb2 的配位比为 2∶3。用化学和红外光谱的方法探讨了树脂对Pb2 的吸附机理。     

201×7阴离子交换树脂对低浓度铂的吸附性能

研究了用201×7强碱性阴离子交换树脂对氯化浸出液中低浓度铂的吸附性能,考察了树脂用量、吸附时间、pH值、反应温度等因素对树脂吸附铂的影响。实验结果表明,pH=1.0时树脂的吸附效果最佳,静态饱和吸附容量可达到190 mg Pt/g干树脂,铂在201×7树脂上的吸附是吸热反应,温度升高有利于铂的吸附,吸附反应热焓变ΔH=36.72 kJ/mol,熵变为ΔS=0.190 kJ/(mol·K)。对201×7树脂吸附铂的吸附等温模型及动力学进行了分析,结果表明,吸附平衡过程符合Langmuir等温式,且为优惠吸附;铂的吸附过程符合准二级动力学方程,准二级常数为k2=1.58×10-4g/(mg·min)。用2.4 mol/L的高氯酸可将载铂树脂中的铂洗脱,洗脱率为83%。     

4—氨基—三氮唑树脂对钌的吸附机理研究

4-氨基-三氮唑树脂 (4-ATR) 吸附Ru(Ⅳ)的最佳介质:酸度为3mol/L HCl。该树脂对Ru(Ⅳ)的饱和吸附容量为3.94m mol Ru(Ⅳ)/g 4-ATR,吸附速率常数k25℃=5.56×10~(-4)s~(-1), 吸附热焓△H=22.59 kJ/mol,Freundlich等溫吸附常数n=3.2。并确定树脂功能基—NH—N<(?)与Ru(Ⅳ)的配位比为1:1。     

N503萃淋树脂吸附镉的研究

研究了Ｎ５０３（Ｎ,Ｎ二仲辛基乙酰胺）萃淋树脂在氢溴酸、硫酸－溴化钠体系中对镉的吸附性能。探讨了Ｎ５０３萃淋树脂在氢溴酸体系中吸附镉的动力学和机理,发现Ｎ５０３萃淋树脂吸附镉的反应按拟一级反应进行,并符合Ｆｒｅｕｎｄｌｉｃｈ等温吸附式。由斜率法和饱和容量法确定Ｎ５０３萃淋树脂吸附镉的反应,镉以ＣｄＢｒ－３形式吸附在Ｎ５０３萃淋树脂上,镉与Ｎ５０３的摩尔比为１∶３。     

001×14.5强酸性树脂对铬(Ⅲ)的吸附性能

采用离子交换树脂法吸附铬(Ⅲ),通过树脂选型确定强酸性阳离子交换树脂001×14.5对铬(Ⅲ)吸附容量最大,用所选的001×14.5树脂研究铬(Ⅲ)的吸附性能。静态吸附实验表明:转速大于120 r/min时,对树脂吸附的影响可忽略,即外扩散基本消除,pH=7.0时,吸附最佳,铬(Ⅲ)吸附率随树脂用量的增加而增大;001×14.5树脂吸附铬(Ⅲ)的过程符合Langmuir等温曲线,且为优惠吸附;吸附过程符合拟二级动力学方程,吸附过程的表观活化能Ea=23.4 kJ/mol,颗粒内扩散为吸附速率的主要控制步骤;用1 mol/L的硫酸对吸附后的饱和树脂进行脱附再生,脱附率可达99%。     

SQD-85树脂对水溶液中镱(Ⅲ)的吸附(英文)

用化学和红外光谱等方法研究SQD-85树脂对镱(III)的吸附和解吸行为,探讨溶液pH、镱(III)初始浓度、温度以及吸附时间对吸附量的影响。结果表明,SQD-85树脂在pH5.5的HAc-NaAc缓冲体系中对镱(III)的吸附效果最佳,测得树脂在308K时的静态饱和吸附量为347.6mg/g;等温吸附符合Langmuir模型;吸附动力学符合假二级动力学模型。热力学参数表明,SQD-85树脂吸附镱(III)是自发的吸热过程。动态实验结果符合Thomas模型。当用1.0mol/LHCl作解吸剂时,解吸率可达97.3%。因此,使用SQD-85树脂可以有效地去除和回收水溶液中的镱(III)。     

苯二氧基二乙酸的相转移催化合成及其浮选性能

用三丁基乙基硫酸乙酯铵作相转移催化剂，以苯二酚、一氯乙酸和氢氧化钠为原料，用三氯甲烷作溶剂，合成了3种不同结构的苯二氧基二乙酸。分别以油酸钠、十二胺和丁黄药为浮选捕收剂，考察了苯二氧基二乙酸对方解石、一水硬铝石和黄铁矿的抑制性能。结果表明，苯二氧基二乙酸的抑制能力较强，对上述3种矿物的抑制性能大小顺序为：方解石＞一水硬铝石＞黄铁矿，可作为方解石等含钙、镁脉石矿物的有效抑制剂。从基团电负性、浮选剂特性指数和亲憎平衡值等方面，对苯二氧基二乙酸的抑制性能进行了讨论。用MINDO3方法对3种药剂进行了量化计算，量化计算结果表明，它们的抑制能力大小顺序为：对位＞间位＞邻位；它们均以负一价离子的形式与矿物中的金属离子发生作用，未离解的羧基则难以发生离解，从而保证药剂与矿物作用后的亲水性，使矿物得到抑制。     

NKA—9大孔树脂对金的吸附

静态法研究ＮＫＡ－９大孔树脂吸附金结果表明，在０．１￣６．０ｍｏｌ／Ｌ的盐酸或５￣２０％的王水介质中，该树脂对金的吸附率均〉９８％，饱和吸附容量为１４４ｍｇ／ｇ，用５％硫脲溶液可快速洗脱吸附的金，树脂可反复使用，树脂对金的吸附以表面物理吸附为主。     

强酸性阳离子交换树脂对铅的吸附行为及机理

通过静态吸附实验,研究了Pb2 在001×7强酸性阳离子交换树脂上的吸附行为,并从热力学和动力学方面对吸附过程进行了分析,用红外光谱的方法探讨了001×7树脂吸附Pb2 的机理.结果表明在所研究的浓度范围内,Pb2 在001×7树脂上的吸附平衡数据符合Freundlich等温吸附方程,吸附为自发进行的放热过程;液膜扩散为Pb2 在001×7树脂上吸附速率的主要控制步骤,随着振荡频率的增加,吸附速率会逐渐增大;最佳的吸附pH在4左右,用3 mol/L的硝酸对饱和树脂进行洗脱再生,洗脱率可达98%以上;298 K温度下树脂的静态饱和吸附容量为414 mg/g(湿树脂).     

Sorption behavior of iminodiacetic acid resin for indium

In（Ⅲ） was quantitatively adsorbed by iminodiacetic acid resin （IDAAR） in the medium of pH = 4.52. The statically saturated sorption capacity of IDAAR is 235.5 mg·g^-1. 1.0 mol·L^-1 HCl can be used as an eluant. The elution efficiency is 97.9%. The resin can be regenerated and reused without apparent decrease of sorption capacity. The sorption rate constant is k298 = 1.94 × 10-5 s^-1. The apparent sorption activation energy of IDAAR for In（Ⅲ） is 20.1 kJ·mol^-1. The sorption behavior of IDAAR for In（HI） obeys the Freundlich isotherm. The enthalpy change is AH= 17.2 kJ·mol^-1.     

Adsorption behavior and mechanism of cadmium on strong-acid cation exchange resin

The adsorption behavior of Cd2+ on 001×7 strong-acid cation exchange resin was studied with the static adsorption method. The adsorption process was analyzed from thermodynamics and kinetics aspects. The influences of experimental parameters such as pH, temperature, initial concentration and adsorption rate were investigated. The experimental results show that in the studied concentration range, 001×7 resin has a good sorption ability for Cd2+, and the equilibrium adsorption data fit to Freundlich isotherms. The adsorption is an exothermic process which runs spontaneously. Kinetic analysis shows that the adsorption rate is mainly governed by liquid film diffusion. The best adsorption condition is pH 4-5. The saturated resin can be regenerated by 3 mol/L nitric acid, and the desorption efficiency is over 98%. The maximal static saturated adsorption capacity is 355 mg/g (wet resin) at 293 K. The adsorption mechanism of Cd2+ on 001×7 resin was discussed based on IR spectra.     

Adsorption behavior and mechanism of D113 resin for lanthanum

The sorption properties of macroporous weak acid resin (Dl13) for La3 ion were studied by chemical analysis and IR spectra. Experimental results indicate that the D113 resin has a good adsorption ability for La3 at pH = 6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 273.3 mg/g. Separation coefficients of βLa3 / Ce3 , βLa3 / Gd3 , βLa3 / Er3 , and βLa3 /γ3 are 2.29, 3.64,4.27, and 0.627, respectively. The apparent activation energy of adsorption, Ea is 18.4 kJ/mol, the thermodynamics parameters △H, △S, and △G of Sorption are 4.53 kJ/mol, 61.8 J/(mol·K), -13.9 kJ/mol, respectively. The adsorption behavior of Dl13 for La3 obeys the Freundlich isotherm. La3 adsorbed on resin can be eluted by 2.0 mol/LHC1 quantitatively.     

Adsorption behavior and mechanism of amino methylene phosphonic acid resin for Ag（ Ⅰ ）

1 Introduction Many efforts have been made on using ion exchange resin to separate and concentrate certain metal cations [1?11]. However, less research for using it to adsorb noble metal Ag(Ⅰ), and much less research for commercializa- tion has been don…     

Adsorption behavior of gel-type weak acid resin （110-H） for Pb^2＋

The adsorption properties of a novel gel-type weak acid resin （110-H） for Pb^2＋ were investigated using chemical methods and IR spectrometry. The optimal adsorption condition of 110-H for Pb^2＋ is at pH=6.49 in HAc-NaAc medium and the statically saturated adsorption capacity is 485 mg/g at 298 K. Pb^2＋ adsorbed on 110-H resin can be eluted with 0.025 mol/L HCl quantificationally. The adsorption rate constants determined under the temperatures of 288, 298, 308 and 318 K are 2.46×10^-5, 3.82×10^-5, 4.46×10^-5 and 5.71×10^-5 s^-1, respectively. The apparent activation energy, Ea, is 18.1 kJ/mol and the thermodynamic parameters of adsorption, △H=20.9 kJ/mol, △S=-161 J/（mol·K） and △G298 K =-48.0 kJ/mol, respectively. The adsorption behavior of 110-H resin for Pb^2＋ accords with the Langmuir isotherm. Infrared spectra show that the oxygen atoms of the functional group of resin coordinate with Pb^2＋ to form the coordination bands.     

Adsorption of copper using macroporous phosphonic acid resin

1　INTRODUCTIONTheresearchpapersaboutsynthesischaracteriza tionandadsorption propertyofpolymericmaterialshavebeenpublishedinrecentyears[15] .Macroporousphosphonicacidresin (PAR)isanovelpolymericma terialwhichcontainsafunctionalgroupof[-PO(OH) 2 ].Ithasquitealotofadvantagessuchashighadsorptioncapacity ,easyregenerationandconvenientoperation .SoPARcanbeusedwellintheadsorptionofmetalions .Butsofar ,therehasn tbeenareportonadsorptionforCu(Ⅱ )whichisoneofimportantelementsinhydrometallurg…     

Adsorption behavior of Pd(Ⅱ) from aqueous solutions by D201 resin

The adsorption and desorption behaviors of Pd(Ⅱ) on D201 resin were investigated. The effects of parameters including HCl concentrations, initial metal ion concentrations, contact time, and temperature on the adsorption of Pd(Ⅱ) were studied by batch method. The HCl concentration for studying the effects was set from 0.01 to 2 mol·L-1 and the optimal adsorption condition is in 0.01 mol·L-1 HCl solution. The adsorption isotherm of Pd(Ⅱ) on D201 resin was determined and the equilibrium data fitted the Langmui...     

银离子在斛壳丹宁酸树脂表面的吸附和解吸(英文)

将斛壳丹宁酸与甲醛聚合来形成的凝胶作为吸附剂能有效地移去水溶液中的银离子。研究了不同银离子初始浓度、溶液温度、pH值条件下斛壳丹宁酸树脂的附和解吸行为。研究了有关经验动力学模型的适应性。伪二级动力学模型表明银离子的吸附是很快的。用FTIR和SEM对吸附和解吸银离子后的斛壳彤宁酸和斛壳丹宁酸树脂进行表征。银离子在斛壳宁酸树脂上的吸附随着银离子初始浓度的增加而增加,随着溶液温度的升高而减少。在低pH值的H2SO4、HNO3和HCl溶液中进行解吸实验。斛壳丹宁酸树脂在pH2.0~7.0溶液中对银离子表现出高的吸附容量,在银离子初始浓度100.0mg/L、温度296K和pH5.0的条件下达到最大的吸附量97.08mg/g。在1mol/LHCl+1%硫脲溶液中银离子的脱吸率达99.6%。