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Adsorption behaviour of Eu(Ⅲ) on natural bamboo fibres: effects of pH, humic acid, contact time, and temperature 认领
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作者 Tao Yu Jun Yang Ze-Yang Wang 《核技术:英文版》 SCIE CAS CSCD 2020年第1期32-41,共10页
To study the adsorption properties of organic functional groups in plant fibres and identify a highly efficient and affordable adsorbent for radioactive wastewater treatment,natural bamboo fibre(NBF)samples were prepa... To study the adsorption properties of organic functional groups in plant fibres and identify a highly efficient and affordable adsorbent for radioactive wastewater treatment,natural bamboo fibre(NBF)samples were prepared,and the adsorption properties of Eu(Ⅲ)on NBFs were studied under given experimental conditions.The effects of the pH,solid-to-liquid ratio,background ions,humic acid,contact time,and temperature on the adsorption behaviour of Eu(Ⅲ)on NBFs were investigated.Adsorption was greatly influenced by pH,and the adsorption curves presented two inflection points at pH≈7 and pH≈11.Moreover,while the ionic strength presented a negative effect at pH<7,the high ionic strength favoured adsorption at pH>7.During adsorption on NBFs,the–OH,C–H,O–H,C–O,and C=O were the main adsorption groups.Hydrolysis occurring on the NBF surface caused the adsorption process to become increasingly difficult at pH>7.The maximum adsorption capacity of NBFs was 147.6 mg/g at 308 K,and the adsorption could be described using the pseudo-second-order kinetic model.The adsorption of Eu(Ⅲ)on NBFs was a spontaneous and endothermic process according to the thermodynamic parameters of the process,and the adsorption thermodynamics could be well described using the Freundlich adsorption model.Therefore,NBFs were determined to be an efficient,inexpensive,and easily disposable sewage treatment material. 展开更多
关键词 ADSORPTION EU(III) NATURAL BAMBOO fibre Organic functional group
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膦酸化氧化石墨烯-壳聚糖复合材料对Eu(III)的富集性能 认领 被引量:1
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作者 蔡雅雯 陈磊 +5 位作者 杨世通 徐琳 吴春芳 刘志勇 陈兰花 王殳凹 《中国科学:化学》 CAS CSCD 北大核心 2019年第1期39-52,共14页
本文定向合成了一种新型的膦酸化氧化石墨烯(GO)-壳聚糖(CS)复合材料(GO-CS-P),并将其应用于水体中三价Eu(III)的高效富集.宏观实验结果显示,这一复合材料对Eu(III)的吸附在5 min内即可达到平衡,在pH 5.5和293 K条件下的最大吸附容量(10... 本文定向合成了一种新型的膦酸化氧化石墨烯(GO)-壳聚糖(CS)复合材料(GO-CS-P),并将其应用于水体中三价Eu(III)的高效富集.宏观实验结果显示,这一复合材料对Eu(III)的吸附在5 min内即可达到平衡,在pH 5.5和293 K条件下的最大吸附容量(106.14 mg/g)高于先前文献中报道的一系列吸附材料.此外,GO-CS-P能够高效、选择性地从高盐度和多组分金属离子共存的水溶液中捕获Eu(III).X射线衍射(X-ray diffraction,XRD)、傅里叶变换红外光谱(Fourier transform infrared spectrometry,FTIR)、X射线吸收光谱(X-ray absorption spectroscopy,XAS)和X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)的分析结果表明,Eu(III)与GO-CS-P表面的膦酸酯基团和羧基发生共价结合,形成稳定的内层络合物.基于本文的研究发现,GO-CS-P复合材料在修复被三价镧系/锕系元素污染的地下水方面具有很大的应用潜力。 展开更多
关键词 GO-CS-P复合材料 Eu(III) 去除性能 光谱分析 吸附机理
Eu(III)在天然植物纤维上的吸附行为 认领 被引量:1
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作者 徐哲婷 于涛 +1 位作者 潘涛 张子翼 《黑龙江大学自然科学学报》 CAS 2019年第2期201-211,共11页
采用分光光度法和批处理法研究了Eu(III)在天然竹纤维和木纤维上的吸附行为,考察了固体投加量、pH、离子强度、腐殖酸、接触时间、温度等因素对吸附的影响,讨论了Eu(III)在竹纤维和木纤维上的吸附动力学和热力学。结果表明,pH对吸附的... 采用分光光度法和批处理法研究了Eu(III)在天然竹纤维和木纤维上的吸附行为,考察了固体投加量、pH、离子强度、腐殖酸、接触时间、温度等因素对吸附的影响,讨论了Eu(III)在竹纤维和木纤维上的吸附动力学和热力学。结果表明,pH对吸附的影响明显;背景离子会抑制Eu(III)在竹纤维和木纤维上的吸附;在低pH值下,腐殖酸对吸附有强化作用,在高pH值下,腐殖酸对吸附有抑制作用。Eu(III)在竹纤维和木纤维上的吸附符合准二级动力学模型和Langmuir吸附等温模型,最大吸附量分别为17.78和18.54mg·g^-1。热力学函数计算结果表明,Eu(III)在竹纤维和木纤维的吸附为自发且吸热的过程。 展开更多
关键词 吸附 EU(III) 竹纤维 木纤维 动力学 热力学
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Self-assembled bright luminescent hierarchical materials from a tripodal benzoate antenna and heptadentate Eu(III) and Tb(III) cyclen complexes 认领
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作者 Aramballi J.Savyasachi David F.Caffrey +4 位作者 Kevin Byrne Gerard Tobin Bruno D'Agostino Wolfgang Schmitt Thorfinnur Gunnlaugsson 《化学科学与工程前沿:英文版》 SCIE EI CAS CSCD 2019年第1期171-184,共14页
The europium heptadentate coordinatively unsaturated (Eu(III)) and the terbium (Tb(III)) 1,4,7,10-tetraazacyclododecane (cyclen) complexes 1 and 2 were used in conjunction with ligand 3 (1,3,5-benzene-trisethynylbenzo... The europium heptadentate coordinatively unsaturated (Eu(III)) and the terbium (Tb(III)) 1,4,7,10-tetraazacyclododecane (cyclen) complexes 1 and 2 were used in conjunction with ligand 3 (1,3,5-benzene-trisethynylbenzoate) to form the supramolecular self-assembly structures 4 and 5;this being investigated in both the solid and the solution state. The resulting self-assemblies gave rise to metal centered emission (both in the solid and solution) upon excitation of 3, confirming its role as a sensitizing antenna. Drop-cased examples of ligand 3, and the solid forms of 4 and 5, formed from both organic and mixture of organic-aqueous solutions, were analyzed using Scanning Electron Microscopy, which showed significant changes in morphology;the ligand giving rise to one dimensional structures, while both 4 and 5 formed amorphous materials that were highly dense solid networks containing nanoporous features. The surface area (216 and 119 m2·g^-1 for 4 and 5 respectively) and the ability of these porous materials to capture and store gases such as N2 investigated at 77 K. The self-assembly formation was also investigated in diluted solution by monitoring the various photophysical properties of 3–5. This demonstrated that the most stable structures were that consisting of a single antennae 3 and three complexes of 1 or 2 (e.g., 4 and 5) in solution. By monitoring the excited state lifetimes of the Eu(III) and Tb(III) ions in H2O and D2O respectively, we showed that their hydration states (the q-value) changed from -2 to 0, upon formation of the assemblies, indicating that the three benzoates of 3 coordinated directly to the each of the three lanthanide centers. Finally we demonstrate that this hierarchically porous materials can be used for the sensing of organic solvents as the emission is highly depended on the solvent environment;the lanthanide emission being quenched in the presence of acetonitrile and THF, but greatly enhanced in the presence of methanol. 展开更多
关键词 self-assembly supramolecular chemistry lanthanides EU(III) and TB(III) COMPLEXES luminescence metallostars
一个三维发光铕配位聚合物的晶体结构及分子识别性能研究 认领
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作者 冯俊阳 郭清 李纲 《化学研究与应用》 CSCD 北大核心 2017年第7期1074-1078,共5页
使有机配体1,4-苯二甲酸(H2DCB)与硝酸铕在DMF(N,N-二甲基甲酰胺)和水的混合溶剂中,通过溶剂热反应,制备出结构新颖的三维发光配位聚合物[Eu(DCB)1.5DMF]n(1)。对其分子结构通过元素分析、红外光谱、PXRD以及单晶X-ray进行了表... 使有机配体1,4-苯二甲酸(H2DCB)与硝酸铕在DMF(N,N-二甲基甲酰胺)和水的混合溶剂中,通过溶剂热反应,制备出结构新颖的三维发光配位聚合物[Eu(DCB)1.5DMF]n(1)。对其分子结构通过元素分析、红外光谱、PXRD以及单晶X-ray进行了表征。研究了1在空气气氛下的热分解特点以及固态荧光光谱,进而测试了其阳离子以及小分子识别性能,发现其对甲苯和四氢呋喃具有一定的识别作用。 展开更多
关键词 对苯二甲酸 铕(Ⅲ) 配位聚合物 晶体结构 荧光识别性能
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Adsorption behavior of 241Am(III) and Eu(III) by silica/polymer-based isoHex-BTP adsorbent from nitric acid solution 认领
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作者 LIU Rui-Qin WANG Xin-Peng +4 位作者 NING Shun-Yan WEI Yue-Zhou YANG Jin-Ling ZHAO Ya-Ping DING You-Qian 《核技术:英文版》 SCIE CAS CSCD 2015年第1期57-64,共8页
关键词 Eu(Ⅲ) 镅-241 吸附行为 硝酸溶液 二氧化硅 聚合物基 吸附剂 LANGMUIR
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响应面法优化凝胶型弱酸性树脂对铕(Ⅲ)的吸附性能 认领
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作者 陈婷 李斌 +3 位作者 方磊 陈德睢 许文斌 熊春华 《中国有色金属学报:英文版》 SCIE EI CAS CSCD 2015年第12期4207-4215,共9页
通过响应面法,对增强凝胶型弱酸性树脂(110-H)在水溶液中对稀土元素铕的吸附作用进行优化。实验表明在最佳条件下110-H对铕的吸附量(346.85 mg/g)令人满意,是目前对铕离子吸附量最高的材料之一。吸附过程拟合一级反应动力学和朗缪... 通过响应面法,对增强凝胶型弱酸性树脂(110-H)在水溶液中对稀土元素铕的吸附作用进行优化。实验表明在最佳条件下110-H对铕的吸附量(346.85 mg/g)令人满意,是目前对铕离子吸附量最高的材料之一。吸附过程拟合一级反应动力学和朗缪尔等温线模型,吸附热力学参数分别为ΔH=36.1 k J/mol,ΔS=200 J/(mol·K)。解吸实验表明110-H可以用浓度为0.1 mol/L的HCl溶液洗脱以实现再生。用红外光谱和扫描电镜技术对比树脂吸附金属离子前、后特征以分析其吸附机理。 展开更多
关键词 响应面法 吸附 凝胶型弱酸性树脂
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鸡蛋清中金霉素残留的银胶表面增强Eu(Ⅲ)的荧光检测 认领
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作者 彭义杰 刘木华 +3 位作者 赵进辉 袁海超 洪茜 李耀 《激光与光电子学进展》 CSCD 北大核心 2014年第10期211-216,共6页
鸡蛋清中残留的金霉素(CTC)易进入人体内蓄积,从而对人体的健康产生损害。研究表明,银胶能作为表面基底来修饰金霉素与Eu(Ⅲ)的配合物,进而使配合物的荧光强度得到显著性的增强。本研究应用银胶表面增强Eu(Ⅲ)的荧光来检测鸡蛋清... 鸡蛋清中残留的金霉素(CTC)易进入人体内蓄积,从而对人体的健康产生损害。研究表明,银胶能作为表面基底来修饰金霉素与Eu(Ⅲ)的配合物,进而使配合物的荧光强度得到显著性的增强。本研究应用银胶表面增强Eu(Ⅲ)的荧光来检测鸡蛋清中金霉素的残留量,分别分析了不同胶体、银胶的加入量、Eu(Ⅲ)的加入量、反应时间等因素对荧光强度的影响,并确定了最佳的实验条件,在最佳条件下建立了以617 nm处的荧光特征峰强度(Y)与鸡蛋清中金霉素含量(X)之间的标定曲线。结果表明:鸡蛋清中金霉素浓度范围在1.5~29.5 mg/L时,鸡蛋清中金霉素含量与荧光强度之间呈现良好的线性关系,线性方程为Y=5.2265X+24.033,决定系数R2为0.9043,实测值与预测值之间的R2=0.9182。可见用银胶表面增强Eu(Ⅲ)的荧光来快速检测鸡蛋清中金霉素的残留量是可行的。 展开更多
关键词 光谱学 金霉素 荧光 银胶 Eu(Ⅲ)
铕(III)三元活性配合物/丙烯酸凝胶的制备 认领
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作者 郑炳云 杨磊 《应用化工》 CAS CSCD 2014年第5期808-812,共5页
以氧化铕( Eu2 O3)、邻菲罗啉( phen)和丙烯酸( AA)为原料,制备了含铕( III)三元活性配合物Eu(AA)3 phen,与丙烯酸-丙烯酰胺凝胶体系进行 UV 共聚,制备了含铕水凝胶。研究了凝胶中 Eu(AA)3 phen 含量对其吸水性、温敏性... 以氧化铕( Eu2 O3)、邻菲罗啉( phen)和丙烯酸( AA)为原料,制备了含铕( III)三元活性配合物Eu(AA)3 phen,与丙烯酸-丙烯酰胺凝胶体系进行 UV 共聚,制备了含铕水凝胶。研究了凝胶中 Eu(AA)3 phen 含量对其吸水性、温敏性及荧光性能的影响,同时探讨了温度及溶胀时间对其荧光性能的影响。结果表明,随Eu(AA)3 phen 含量的增加,凝胶吸水率先增加后减少,荧光强度逐渐增强;对于特定的凝胶体系,其12 h 溶胀度随温度增加而增加,凝胶的荧光强度随溶胀时间和温度增加而减弱。当 Eu(AA)3 phen 的添加量为3.5%时,凝胶综合性能最佳:平衡溶胀度为631 g/ g,4 h 内吸水率达90%以上,荧光强度为175 a. u.。所研制的水凝胶在吸水及荧光性能方面对温度均具有良好的响应性。 展开更多
关键词 UV 固化 含铕水凝胶 荧光行为 温敏性 HYDROGEL containing EU(III)
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Surface complexation modeling of Eu(III) adsorption on silica in the presence of fulvic acid 认领
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作者 YE YuanLv CHEN ZongYuan +3 位作者 MONTAVON Gilles JIN Qiang GUO ZhiJun WU WangSuo 《中国科学:化学英文版》 SCIE EI CAS 2014年第9期1276-1282,共7页
Humic substances(HS) substantially affect heavy metal(M) adsorption on mineral surfaces. However, quantitative descriptions of ternary systems involving M, HS and mineral surfaces remain unclear. This study examines a... Humic substances(HS) substantially affect heavy metal(M) adsorption on mineral surfaces. However, quantitative descriptions of ternary systems involving M, HS and mineral surfaces remain unclear. This study examines adsorption in a model ternary system including Eu(III), fulvic acid(FA) and silica, and describes the adsorption of Eu(III) and FA by combining a double-layer model(DLM) and the Stockholm humic model(SHM). SHM explains the binding of H+ and Eu3+ to FA and the DLM for FA and Eu(III) adsorption on silica. Experimental results showed that the presence of FA promotes Eu(III) adsorption at acidic pH values, but decreases it at basic pH values, which indicates the formation of ternary surface complexes. Modeling calculations have shown that two ternary surface complexes are required to describe the experimental results in which Eu3+ acts as a bridge between the surface site and FA. The present study suggests that the discrete-site approach to HS is a promising method for interpreting the adsorption data for M, HS and mineral ternary systems. 展开更多
关键词 表面络合模型 吸附数据 铕(Ⅲ) 二氧化硅 黄腐酸 三元表面配合物 矿物表面 三元系统
Mechanism and microstructure of Eu(III) interaction with γ-MnOOH by a combination of batch and high resolution EXAFS investigation 认领
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作者 GAO Xing SHENG GuoDong HUANG YuYing 《中国科学:化学英文版》 SCIE EI CAS 2013年第11期1658-1666,共9页
In this paper,the macroscopic interaction method and high resolution EXAFS technique with a bent crystal analyzer were combined to study Eu(Ⅲ)interaction mechanism and microstructure withγ-MnOOH as a function of pH.... In this paper,the macroscopic interaction method and high resolution EXAFS technique with a bent crystal analyzer were combined to study Eu(Ⅲ)interaction mechanism and microstructure withγ-MnOOH as a function of pH.The results indicated that Eu(Ⅲ)interaction withγ-MnOOH was apparently dependent on pH but independent of ionic strength,suggesting the formation of inner-sphere surface complexation for Eu(Ⅲ)ontoγ-MnOOH.Results of EXAFS analysis indicated that Eu was surrounded by~9.0 O atoms in first coordination shell at REu–O≈2.40,and second shell of Mn atoms at REu–Mn≈3.60 was observed for the three adsorption samples.These findings suggested formation of a bidentate surface complex with Eu(Ⅲ)bonding by edge sharing to MnO6-octahedron on γ-MnOOH surface.Both the macroscopic interaction data and the molecular level evidence of Eu(Ⅲ)microstructure at the γ-MnOOH-water interface should be factored into better understanding the fate and mobility of Eu(Ⅲ)and related radionuclides in the natural soil and water environment. 展开更多
关键词 EXAFS技术 微观结构 相互作用 高分辨率 水锰矿 III Eu 铕(Ⅲ)
Eu(Ⅲ)在泥炭上的吸附行为研究 认领 被引量:1
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作者 刘峙嵘 张寰 +3 位作者 张思纬 文传玺 叶榕 吴振宇 《东华理工大学学报:自然科学版》 CAS 2013年第2期233-238,共6页
采用静态法研究了Eu(Ⅲ)在泥炭上的吸附行为。探讨了固液比、离子强度、pH、腐殖酸等因素对吸附的影响,并测定了不同温度下的吸附等温线。实验结果表明,pH对Eu(Ⅲ)吸附过程影响较大;离子强度有一定影响;低pH情况下腐殖酸会促进E... 采用静态法研究了Eu(Ⅲ)在泥炭上的吸附行为。探讨了固液比、离子强度、pH、腐殖酸等因素对吸附的影响,并测定了不同温度下的吸附等温线。实验结果表明,pH对Eu(Ⅲ)吸附过程影响较大;离子强度有一定影响;低pH情况下腐殖酸会促进Eu(Ⅲ)吸附的进行,高pH情况下腐殖酸会抑制吸附的进行;吸附反应的吉布斯自由能变小于零说明吸附过程自发进行;吸附过程符合Freundlich吸附模型。 展开更多
关键词 Eu(Ⅲ) 吸附 泥炭
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Determination of Apparent Formation Constants of Eu(III) with Humic Substances by Ion Selective Liquid Membrane Electrode 认领
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作者 Takayuki Sasaki Hatsumi Yoshida +2 位作者 Taishi Kobayashi Ikuji Takagi Hirotake Moriyama 《美国分析化学(英文)》 2012年第7期462-469,共8页
This is the novel measurement of the apparent formation constants of trivalent lanthanide with humic substances by potentiometric titration using an ion selective electrode (ISE) consisting of bis(diphenylphosphoryl)m... This is the novel measurement of the apparent formation constants of trivalent lanthanide with humic substances by potentiometric titration using an ion selective electrode (ISE) consisting of bis(diphenylphosphoryl)methane as an ionophore. The ISE prepared exhibited a Nernstian response to the Eu3+ concentration in the test solutions in the presence of humic acid and fulvic acid. The effect of the solution conditions, including the pH, initial metal and humic substance concentrations, and ionic strength, on the formation constants was examined. The present formation constants were compared with the reported data using solvent extraction method. 展开更多
关键词 APPARENT Formation Constant HUMIC Substance EU(III) ION SELECTIVE ELECTRODE Titration
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Synthesis of novel europium complexes and their photoluminescence properties 认领
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作者 史林芳 李艳伟 +2 位作者 曹华茹 关莹 马永纯 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2012年第1期 17-20,共4页
Two novel luminescent Eu(III) complexes with the formulas(NIP)Eu(DBM)3 1 and(ENIP)Eu(DBM)3 2(NIP=2-(naphtha-len-1-yl)-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-(naphthalen-1-yl)-1H-imidazo... Two novel luminescent Eu(III) complexes with the formulas(NIP)Eu(DBM)3 1 and(ENIP)Eu(DBM)3 2(NIP=2-(naphtha-len-1-yl)-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-(naphthalen-1-yl)-1H-imidazo [4,5-f] [1,10] phenanthroline,DBM= dibenzoylmethanato) were successfully synthesized and characterized by IR and elemental analysis.The UV-vis absorption spectra and pho-toluminescence properties of the complexes were investigated,and the irradiation at the absorption band between 300-400 nm of europium complexes either in solution or in the solid state led to the emission of a sharp red band at ~610 nm,a characteristic Eu3+ emission due to the transition of 5D0→7F2.Furthermore,the weak emission bands around 587 and 595 nm attributed to 5D0→7F0 and 5D0→7F1 transition were also displayed in the emission spectra.These results demonstrated that the Eu(III) ion was sensitized efficiently by the ligand and displayed photoluminescence with high intensity,narrow half-peak width,and monochromic light.The excited-state lifetimes of 1 and 2 were in the microsecond time scale,but the photoluminescence quantum yield of 2(0.03) was two times higher than that of 1(0.01) which should be at-tributed to the effect of the ethyl substituting in ENIP. 展开更多
关键词 EU(III) complex LUMINESCENT PROPERTY SECOND LIGAND RARE earths
Eu(III)在北山花岗岩上的吸附作用 认领 被引量:6
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作者 郭治军 陈宗元 +4 位作者 吴王锁 刘春立 陈涛 田文宇 黎春 《中国科学:化学》 CSCD 北大核心 2011年第5期907-913,共7页
用电位滴定法研究了甘肃北山花岗岩(BS03,600m)的酸、碱性质,用批式法研究了Eu(III)在该花岗岩上的吸附行为.实验结果表明:在离子强度I=0.1M的NaCl溶液中,北山花岗岩的pHPZNPC为9.4,当I增大至0.4M时,pHPZNPC为9.0.不同离子强度下... 用电位滴定法研究了甘肃北山花岗岩(BS03,600m)的酸、碱性质,用批式法研究了Eu(III)在该花岗岩上的吸附行为.实验结果表明:在离子强度I=0.1M的NaCl溶液中,北山花岗岩的pHPZNPC为9.4,当I增大至0.4M时,pHPZNPC为9.0.不同离子强度下花岗岩的电位滴定曲线与类似条件下蒙脱石的相仿.Eu(III)在北山花岗岩上的吸附分配比(Kd)随pH、离子强度和Eu(III)浓度的变化而变化.在低pH范围,Eu(III)的Kd值随离子强度的增大显著减小,而在高pH值范围,离子强度对Kd的影响甚微.用模型定量解释了Eu(III)在北山花岗岩上的吸附随pH、离子强度和Eu(III)浓度而变化的实验数据,该模型包含Eu3+与花岗岩发生的阳离子交换反应以及Eu(III)与花岗岩表面羟基发生两个内层表面配合反应(inner-sphere surface complexation reactions).用所建模型对离子强度为0.1M时Eu(III)在北山花岗岩上的吸附行为作了预测,并与文献报道的类似条件下Am(III)在北山花岗岩上的吸附实验数据作了比较. 展开更多
关键词 北山花岗岩 吸附 EU(III) 表面配位 构模
Eu(III) adsorption on rutile:Batch experiments and modeling 认领
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《中国科学:化学英文版》 SCIE EI CAS 2010年第12期2628-2636,共9页
Eu(III) adsorption on rutile was investigated as a function of contact time,pH,ionic strength and Eu(III) concentration by using a batch experimental method.The effects of carbonate,sulfate,and phosphate were also st... Eu(III) adsorption on rutile was investigated as a function of contact time,pH,ionic strength and Eu(III) concentration by using a batch experimental method.The effects of carbonate,sulfate,and phosphate were also studied.It was found that the kinetics of Eu(III) adsorption on rutile could be described by a pseudo-second-order model.The adsorption of Eu(III) on rutile is strongly pH-dependent,but relatively insensitive to ionic strength.A double layer model (DLM) with two inner-sphere Eu(III) surface complexes was applied to quantitatively interpret the adsorption of Eu(III) on rutile.There were no apparent effects of carbonate and sulfate on Eu(III) adsorption,whereas the presence of phosphate promoted Eu(III) adsorption on rutile.The surface complexes of Eu(III) on rutile were evidenced by X-ray photoelectron spectroscopy (XPS). 展开更多
关键词 EU(III) ADSORPTION RUTILE KINETICS surface COMPLEXATION modeling XPS
Sorption of Eu(Ⅲ) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques 认领 被引量:2
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《中国科学:化学英文版》 SCIE EI CAS 2010年第6期1420-1428,共9页
Bentonite has been extensively studied because of its strong sorption ability and low permeability.In this work,the Na-bentonite from Gaomiaozi County (China) has been characterized by XRD,FTIR and acid-base titratio... Bentonite has been extensively studied because of its strong sorption ability and low permeability.In this work,the Na-bentonite from Gaomiaozi County (China) has been characterized by XRD,FTIR and acid-base titration.The sorption of Eu(III) on Na-bentonite in the absence/presence of humic acid (HA) was studied at T = 25 ± 2 °C and in 0.01 mol/L NaClO4 solution.The effects of pH,HA,contact time and initial Eu(III) concentrations were also investigated.The results indicate that the sorption of Eu(III) on Na-bentonite was dependent on pH values.The presence of HA had little effect on Eu(III) sorption at low pH values,but decreased Eu(III) sorption at high pH values.X-ray absorption fine structure spectroscopy (XAFS) was applied to characterize the local structural environment of the adsorbed Eu(III) on bare Na-bentonite and HA-bentonite hybrids.The re- sults indicate that Eu(III) was bound to O atoms at a distance of about 2.39  at pH 4.15.The results are crucial for the evalua- tion of the sorption and migration of other trivalent lanthanides and actinides in bentonite as backfill materials. 展开更多
关键词 NA-BENTONITE EU(III) SORPTION HUMIC acid XAFS
静态法和X射线吸收精细结构光谱技术研究腐殖酸对Eu(Ⅲ)在高庙子膨润土上的吸附影响 认领 被引量:3
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作者 胡君 贺博 +5 位作者 谢治 盛国栋 陈长伦 李家星 陈义学 王祥科 《中国科学:化学》 CSCD 北大核心 2010年第5期567-576,共10页
膨润土由于其高吸附性和低渗透性而受到广泛的研究.在本文中,利用XRD、FTIR和酸碱滴定对我国内蒙古高庙子膨润土进行了详细的表征和分析.用静态法研究在温度为25±2℃和0.01mol/L NaClO4溶液中,pH值、腐殖酸、接触时间和Eu(Ⅲ)初... 膨润土由于其高吸附性和低渗透性而受到广泛的研究.在本文中,利用XRD、FTIR和酸碱滴定对我国内蒙古高庙子膨润土进行了详细的表征和分析.用静态法研究在温度为25±2℃和0.01mol/L NaClO4溶液中,pH值、腐殖酸、接触时间和Eu(Ⅲ)初始浓度对Eu(Ⅲ)在钠基膨润土上的吸附影响.研究结果表明Eu(Ⅲ)的吸附受pH值影响明显.在低pH值条件下,腐殖酸对Eu(III)的吸附影响微弱,而在高pH值条件下腐殖酸降低Eu(Ⅲ)的吸附.X射线吸收精细结构光谱(XAFS)技术对吸附在膨润土上的Eu(Ⅲ)局域微观结构研究结果表明,在pH为4.15条件下,Eu在膨润土上与其周围的氧原子间的距离大约为2.39.本文中的研究结果对于评估其他三价镧系和锕系元素在作为填充材料的膨润土上的吸附和迁移具有重要的意义. 展开更多
关键词 Na基膨润土 EU(III) 吸附 腐殖酸 X射线吸收精细结构 光谱(XAFS)技术
均苯四甲酸铕发光配合物的合成与表征 认领 被引量:3
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作者 任慧娟 洪广言 +2 位作者 宋心远 刘桂霞 鲁佳 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2005年第6期 943-945,共3页
在乙醇和水的混合溶剂中合成了均苯四甲酸(H4L)铕发光配合物.通过元素、化学分析、红外光谱确定其化学组成为Eu4/3L·7H2O.热分析表明,配合物在530℃以下稳定性较好,X射线衍射结果表明,配合物为晶体物质,扫描电镜照片表明配合物为... 在乙醇和水的混合溶剂中合成了均苯四甲酸(H4L)铕发光配合物.通过元素、化学分析、红外光谱确定其化学组成为Eu4/3L·7H2O.热分析表明,配合物在530℃以下稳定性较好,X射线衍射结果表明,配合物为晶体物质,扫描电镜照片表明配合物为块状物质,晶粒10 μm~20 μm,荧光光谱分析表明配合物在紫外光的激发下发出铕的特征荧光. 展开更多
关键词 均苯四甲酸 发光 配合物
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交联聚乙烯醇衍生物的合成及对Eu(Ⅲ)的吸附作用 认领
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作者 王艳 余安国 +1 位作者 谭昭怡 冯易君 《离子交换与吸附》 CAS CSCD 北大核心 2005年第1期 33-39,共7页
探讨了含有磷酸功能基的交联聚乙烯醇衍生物的合成路线,考察了它对Eu3+的吸附性能.讨论了丁醛用量,吸附酸度,洗脱,吸附流速以及共存离子干扰等影响,获得了良好的实验结果.
关键词 交联聚乙烯醇衍生物 三价铕 吸附
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