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sorption Behavior and mechanism of D113 Resin for Erbium

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Journal of Rare Earths 2007年第S1期25卷 169-174页

作者：姚彩萍 Department of Applied Chemistry Zhejiang Gongshang University

The sorption behavior and mechanism of a novel macroporous weak acid resin(D113 resin) for Er(Ⅲ) were investigated. The optimal sorption condition of D113 resin for Er(Ⅲ) was pH 6.42 in HAc-NaAc medium. The statically saturated sorption capacity was 272 mg·g-1 at 298 K in HAc-NaAc medium. The Er(Ⅲ) adsorbed on D113 resin could be reductively eluted by the mixed solution of HCl and NaCl. The elution percentage could reach 100%. The resin could be regenerated and reused without apparent decrease of sorption capacity. The apparent sorption rate constant was k298=1.98×10-5 s-1. The apparent activation energy was 8.60 kJ·mol-1. The sorption behavior of D113 resin for Er(Ⅲ) obeyed the Freundlich isotherm and Langmuir isotherm. The sorption parameters of thermodynamics were ΔH=44.0 kJ·mol-1, ΔS=223 J·mol-1·K-1, ΔG298 K=-22.3 kJ·mol-1, respectively. The molar coordination ratio of the functional group of D113 resin to Er(Ⅲ) was 3∶1. The sorption mechanism of D113 resin for Er(Ⅲ) was examined using chemical method and IR spectrometry.

关键词： D113 resin erbium sorption mechanism thermodynamics kinetics rare earths

sorption of lanthanide ions on biochar composites

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Journal of Rare Earths 2018年第11期36卷 1212-1220页

作者： Dorota Kotodyniska Justyna Bak Malwina Majdariska Dominika Fila Department of Inorganic Chemistry Faculty of ChemistryMaria Curie-Sktodowska UniversityM.Curie Sktodowska 5q.220-031 tublinPoland

sorption of lanthanum（Ⅲ）, cerium（Ⅲ and neodymium（Ⅲ） ions from the aqueous solutions of mixtures through adsorption on the biochar composites was investigated as a function of sorbent mass, pH, phase contact time and initial concentration of solutions at 295 K. The maximum removal of lanthanide ions takes place under the following conditions： 0.1 g of sorbent mass, pH 4 and 360 rain contact time for all studied initial concentrations of solutions. Kinetics of La（Ⅲ）, Ce（Ⅲ） and Nd（Ⅲ） ions sorption proceeded by a fast initial uptake reached equilibrium. This process was modelled by means of the pseudo first order, pseudo second order, intraparticle diffusion and Elovich models. The desorption of three lanthahide ions by nitric, hydrochloric and sulfuric acids at a concentration of 1 mol/L from biochar composites was also studied. In order to investigate the sorption mechanism FFIR, XRD and XPS analyses were performed after sorption of ions from the mixture.

关键词： Lanthanide ions Biochar composites sorption mechanism Zerovalent iron Rare earths

Diphenylarsinic acid sorption batch experiments and mechanisms in soils using EXAFS spectroscopy

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 31-42页

作者： Meng Zhu Yongming Luo Ruyi Yang Shoubiao Zhou Juqin Zhang Mengvun Zhang Peter Christie Elizabeth L.Rylott College of Environmental Science and Engineering.Anhui Normal University Wuhu 241002China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation Anhui Normal UniversityWuhu 241002China Centre for Novel Agricultural Products Department of BiologyUniversity of YorkYork YO105DDUK

Diphenylarsinic acid(DPAA)is a phenyl arsenic compound derived from chemical warfare *** and microscopic work on DPAA sorption will provide useful information in predicting the partitioning and mobility of DPAA in the soil-water ***,batch experiments and extended X-ray absorption fine structure(EXAFS)spectroscopy were used to investigate the sorption mechanisms of *** DPAA sorption data from 11 soil types was found to fit the Freundlich equation,and the sorption capacity,Kf,was significantly and positively correlated with oxalateextractable *** Kf values of eight of the 11 untreated soils(1.51113.04)significantly decreased upon removal of amorphous metal(hydr)oxides(0.51-13.37).When both amorphous and crystalline metal(hydr)oxides were removed from the untreated soils,the values either decreased or slightly increased(0.65-3.09).Subsequent removal of soil organic matter from these amorphous and crystalline metal(hydr)oxide-depleted samples led to ftirther decreases in A^f to 0.021.38,with only one exception(Sulfic Aquic-Orthic Halosols).These findings strongly suggest that ligand exchange reactions with amorphous metal(hydr)oxides contribute most to DPAA sorption on *** data provide further evidence that DPAA primarily formed bidentate binuclear(~C)and monodentate mononuclear(1 V)coring-sharing complexes with As-Fe distances of 3.34 and 3.66 A,respectively,on Fe(hydr)*** of these results with earlier studies suggests that 2C and 1 F complexes of DPAA may be favored under low and high surface coverages,respectively,with the formation of 1 V bonds possibly conserving the sorption sites or decreasing the steric hindrance derived from phenyl substituents.

关键词： Diphenylarsinic acid EXAFS Fe(hydr)oxide Soil organic matter sorption mechanism

Removal of fluoride from water using titanium-based adsorbents

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Frontiers of Environmental Science & Engineering 2010年第4期4卷 414-420页

作者： Zhijian LI Shubo DENG Xueying ZHANG Wei ZHOU Jun HUANG Gang YU Department of Environmental Science and Engineering POPs Research CenterTsinghua UniversityBeijing 100084China

Three adsorbents including TiO_(2),Ti-Ce,and Ti-La hybrid oxides were prepared to remove fluoride from aqueous *** Ti-Ce and Ti-La hybrid adsorbents obtained by the hydrolysis-precipitation method had much higher sorption capacity for fluoride than the TiO_(2) adsorbent prepared through *** earth(Ce and La)oxides and TiO_(2) exhibited a synergistic effect in the hybrid adsorbents for fluoride *** sorption equilibrium of fluoride on the three adsorbents was achieved within 4 h,and the pseudo-second-order model described the sorption kinetics *** sorption isotherms fitted the Langmuir model well,and the adsorption capacities of fluoride on the Ti-Ce and Ti-La adsorbents were about 9.6 and 15.1 mg·g^(-1),respectively,at the equilibrium fluoride concentration of 1.0 mg·L^(-1),much higher than the 1.7 mg·g^(-1) on the TiO_(2).The sorption capacities of fluoride on the three adsorbents decreased significantly when the solution pH increased from 3 to *** electrostatic interaction played an important role in fluoride removal by the three adsorbents,and Fourier transform infrared(FTIR)analysis indicated that the hydroxyl groups on the adsorbent surface were involved in fluoride adsorption.

关键词： fluoride adsorption titanium dioxide titanium-based adsorbent sorption mechanism

Preparation and Properties of A Novel Adsorbent for Selective Removal of Anions from Aqueous Solution

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Journal of Wuhan University of Technology(Materials Science) 2005年第3期20卷 57-59页

作者：江喆 School of Environmental Science and Engineering Kunming University of Science and Technology

Zeolite modified by lanthanum compounds would be an excellent wnter purification agent that can simultaneously remove both cations and anions in aqtwous solution. For this purpose, a novel adsorbent was prepared by loading lanthanide on the zeolite, and the optimum manufacturing conditions were achieved. The concentration of the modifying solution was 0.5M, in which zeolites .should be kept for 2 hours. The applicable solid/ liquor ratio was 1：25 nt pH10, and the sample was sintered at 600 ℃ for an hour. In addition, the adsorption capacity of modified zeolite for removing different anions from aqueous solution and its regeneration were ulso investigated. The results indicate that high performances uf the novel adsorbent make it possible to be manufactured in industy .

关键词： modified zeolite targeted anion sorption mechanism regeneration

sorption of Organic Compounds in Soil Organic Matter

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Journal of Northeast Agricultural University(English Edition) 2001年第1期8卷 72-80页

作者： XING Bao-shan,LIU Xiao-bing, SONG Chun-yu ( Heilongjiang Institute of Agricultural Modernization,Academia Sinica,Harbin, Heilongjiang 150040,P R C) ( Department of Plant and Soil Seinces, University of Massachussetts, Amherst, USA) Heilongjiang Institute of Agricultural Modernization Academia Sinica Department of Plant and Soil Seinces University of Massachussetts Heilongjiang Institute of Agricultural Modernization Academia Sinica

Soil organic matter(SOM)is the predominant component for sorption of hydrophobic organic compouds in soil and sorption by SOM ultimately affects chemical fate and availability in soil,and the degree of remedia- tion success of contaminated soils. This paper summarizes the latest development on sorption of organic com- pounds in soil (natural) organic matter,addresses four sorption mechanisms: surface adsorption,solid - phase Partitioning,dual-mode sorption,and fixed-pore sorption model,and presents future research directions as well.

关键词： sorption Soil organic matter sorption mechanism Organic compounds

Adsorption of Er(Ⅲ ) and Its mechanism on Diglycolamidic Acid Resin

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Journal of Rare Earths 2002年第5期20卷 492-496页

作者：熊春华沈秋仙 Department of Chemistry Lishui Teachers College Lishui 323000 China

The adsorption behavior and mechanism of a novel chelate resin, diglycolamidic acid resin (DAAR) for Er(Ⅲ) were investigated. The optima adsorption condition of DAAR for Er(Ⅲ) is pH 6.20 in HAc NaAc medium. The statically saturated adsorption capacity is 189 mg·g -1 resin at 298 K. The Er (Ⅲ) adsorbed on DAAR can be eluted reaching 100% by 2 mol·L -1 HCl used as eluant. The resin can be regenerated and reused without apparent decreasing of adsorption capacity. The apparent adsorption rate constant is k 298 =1.94×10 -5 s -1 . The apparent activation energy is 24.7 kJ·mol -1 . The adsorption behavior of DAAR for Er(Ⅲ) obeys the Freundlich isotherm. The thermodynamic adsorption parameters, enthalpy change Δ H of DAAR for Er(Ⅲ) is 24.1 kJ·mol -1 . The molar coordination ratio of the functional group of DAAR to Er (Ⅲ) is 3∶1. The adsorption mechanism of DAAR for Er (Ⅲ) was examined by using chemical method and IR spectrometry. The coordination compound is formed between oxygen atoms in the functional group of DAAR and Er(Ⅲ).

关键词： rare earths diglycolamidic acid resin erbium sorption mechanism

Kinetics and Thermodynamic Studies: Adsorption of Pb, Cr and Ni Ions from Spent Lubrication Oil (SLO) Using Acid Modified Clay

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American Journal of Analytical Chemistry 2021年第5期12卷 109-120页

作者： Felix Sughnen Atsar Donald Kukwa Raymond Ahule Wuana Beatrice Arwenyo Department of Chemistry Benue State University Makurdi Nigeria Department of Chemistry University of Agriculture Makurdi Nigeria Department of Chemistry Gulu University Gulu Uganda

Adsorption of Pb, Cr, and Ni ions from spent lubrication oil (SLO) by sulphuric acid modified clay (SAMC) was investigated considering the effect of contact time and temperature of the adsorption system. The removal percentage of the heavy metals was found to be temperature and contact time-dependent. Adsorption of the heavy metals increases with an increase in temperature and contact time with 95.0% - 100% adsorption recorded at the temperature of 331 K with the equilibration time of 12 hours. The thermodynamic and kinetics investigation of the adsorption process showed that the adsorption of these metals by the modified adsorbent is a spontaneous and endothermic physical adsorption process that followed the pseudo-second-order kinetic model.

关键词： Adsorption Heavy Metals sorption mechanism Pseudo-Second-Order Kinetic Model