Study on Synthesis and Properties of Spinel Structure Li1+xMn2-xO4 for Lithium Ion-Sieve Precursor

2013 ◽  
Vol 437 ◽  
pp. 560-563
Author(s):  
Shi Tao Song ◽  
Su Xia Wu ◽  
You Shun Peng ◽  
Xue Fang Zheng ◽  
Qi Lian
Keyword(s):  
Adsorption Capacity ◽  
Spinel Structure ◽  
Ph Value ◽  
Lithium Ion ◽  
Molar Ratio ◽  
Ion Adsorption ◽  
Solid State Method ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Structure Morphology

Spinel structure Li1+xMn2-xO4 materials for lithium ion-sieve precursor were synthesized by high temperature solid state method and their adsorption properties were improved by adjusting the molar ratio of lithium to manganese. The structure, morphology and adsorption performance of the synthetic samples were characterized by XRD, SEM, and lithium ion adsorption experiments. The influences of pH value and adsorption time on adsorption capacity were discussed. The results showed that the Li1.3Mn1.7O4 material had the largest adsorption capacity and it reached up to 24.06 mg·g-1 when the pH value was 12 and the adsorption time was 10 h.

Adsorption Characteristics of Hg2+ Ions Using Fe3O4/Chitosan Magnetic Nanoparticles

2011 ◽  
Vol 291-294 ◽  
pp. 72-75 ◽  
Author(s):  
Bo Lin Liang
Keyword(s):  
Magnetic Nanoparticles ◽  
Adsorption Capacity ◽  
Uniform Distribution ◽  
Ph Value ◽  
Cross Linking ◽  
Mercury Ions ◽  
Dialdehyde Starch ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Chemical Cross Linking

Fe3O4/chitosan magnetic nanoparticles were prepared by chemical cross-linking technique, using dialdehyde starch as a crosslinker, and the adsorption performance of the adsorbent toward Hg2+ was investigated. The adsorption capacity of mercury ions was greatly affected by pH value, adsorption doses and adsorption time. Results indicated that optimal adsorption conditions were pH value, 6, adsorption doses, 140 mg.L-1, adsorption time, 20 min, and the adsorption capacity was 25.12 mg.g-1. The well-defined nanoparticles with a uniform distribution were observed.

The Preparation of Lithium Ion Sieve and Determination of its Adsorption Performance Parameters

2013 ◽  
Vol 706-708 ◽  
pp. 353-356
Author(s):  
Jiu Chen Jia ◽  
Li Fang Chen ◽  
Yong Xin Qi ◽  
Xiao Dong Luan ◽  
Hua Wen Wang ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Adsorption Capacity ◽  
Loss Rate ◽  
Lithium Ion ◽  
Performance Parameters ◽  
Adsorption Experiment ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Equilibrium Adsorption Capacity

This paper chose LiMn2O4 as ion-sieve. In the ion-sieve precursor pickling experiment, the elution effects of hydrochloride, nitric acid and sulfate were compared and hydrochloride was proved the suitable eluent. By changing the acidity of pickling time, the lithium evacuation rate and the manganese solution loss rate basically achieved balance after pickling for 5 h. The static adsorption experiment suggested that when the pH was 12.5 and adsorption time was 30 h, the equilibrium adsorption capacity was 19.71 mg/g.

Study on the Adsorption Performance of Zn(II) over Bentonite

2013 ◽  
Vol 575-576 ◽  
pp. 276-279
Author(s):  
Guo Xiang Pan ◽  
Ya Jing Zhang ◽  
Da Gan Chai ◽  
Yan Fei Yu
Keyword(s):  
Kinetic Equation ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Ph Value ◽  
Langmuir Equation ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Initial Ph ◽  
Increasing Process ◽  
Adsorption Activation Energy

Bentonite is applied in the simulative waste water containing Zn (II) ions in this paper, and the influences of initial pH value, temperature, adsorption time, Zn (II) concentration on the adsorption performance have been tested, and thermodynamic and kinetic equation are fitted. The results show that Zn (II) adsorption capacity increases firstly and then tends to balance as the pH increases. The higher the temperature is, the better adsorption capacity is. Zn (II) adsorption occurs within 60 minutes. Langmuir equation is used to fit adsorption thermodynamic equation, which indicates that the adsorption can occur spontaneously, and it is an endothermic and entropy increasing process. In addition, a kinetic equation is more suitable for the description of Zn (II) adsorption mechanism, and adsorption activation energy calculated is 6.90 kJ/mol.

Adsorption of Cu(II) Ions from an Aqueous Solution by Cross-Linked Carboxymethyl Konjac Glucomannan

2011 ◽  
Vol 239-242 ◽  
pp. 2310-2316 ◽  
Author(s):  
Chun Mei Niu ◽  
Shao Ying Li ◽  
Dong Huang
Keyword(s):  
Adsorption Capacity ◽  
Copper Nitrate ◽  
Konjac Glucomannan ◽  
Ion Adsorption ◽  
Adsorption Time ◽  
Isotherm Equation ◽  
Langmuir Isotherm Equation ◽  
Effects Of Ph ◽  
The Relationship ◽  
Carboxymethyl Konjac Glucomannan

Crosslinked Carboxymethyl Konjac Glucomannan(CMKGM) with substitution degrees ofcarboxymethyl group（DS）0.265, 0.457 and 0.586 were prepared through reaction of monochloroacetic acid, konjac glucomannan(KGM) and epichlorohydrin and used to adsorb Cu(II) from the aqueous solutions of copper nitrate. The effects of pH, adsorbent dose, initial concentration of Cu(II), adsorption time and temperature on adsorption capacity were investigated. The results showed that adsorption capacity increased with an increasing DS of the carboxymethyl groups. Equilibrium adsorption time was 20 min or so and was independent on DS. The adsorption followed Langmuir isotherm equation. Ligand ion adsorption between carboxymethyl group and Cu(II) was thought to be predominate in the process of adsorption according to the relationship between DS and thermodynamic parameters. CMKGM can be used as cheaper and more effective adsorbents.

Adsorption Property of MgAl-NO3 Layered Double Hydroxides to Methyl Orange

2013 ◽  
Vol 750-752 ◽  
pp. 1738-1741
Author(s):  
Jian Hui Yan ◽  
Lu Hong Zhang ◽  
You Gen Tang ◽  
Li Zhang
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Hydrothermal Method ◽  
Layered Double Hydroxides ◽  
Adsorption Property ◽  
Molar Ratio ◽  
Adsorption Performance ◽  
Ft Ir ◽  
Double Hydroxides

MgAl-NO3 LDHs were prepared by hydrothermal method. The as-prepared samples were characterized by SEM, XRD and FT-IR. The adsorption performance of MgAl-NO3 LDHs to methyl orange (MO) was studied. The effects of Mg/Al molar ratio on the adsorption performance of MgAl-NO3 LDHs were investigated. The results showed that the highest adsorption capacity of 499.98mg/g was obtained when the Mg/Al molar ratio was at 2.5:1.

Synthesis of LiFePO4/C Composite Cathode Materials by Solid State Method Using Mixed Iron Sources

2013 ◽  
Vol 734-737 ◽  
pp. 2541-2544
Author(s):  
Wei Wang ◽  
Zheng Zhang ◽  
Dao Wushuang Shi ◽  
Xing Quan Liu
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Molar Ratio ◽  
Electrochemical Performances ◽  
Solid State Method ◽  
State Reduction ◽  
Solid State Reduction

The olivine LiFePO4/C composite cathode materials for lithium-ion batteries were synthesized by solid state reduction method using mixed iron sources. The effects of different temperatures on the electrochemical performance of as-synthesized cathode materials were investigated and analyzed. The crystal structures and the electrochemical performances were characterized by SEM, galvanostatical charge-discharge testing and AC-impedance, respectively. The results demonstrated that the LiFePO4/C composite cathode material synthesized at 710°C and with 1/2(FeC2O4·2H2O/Fe2O3) molar ratio of mixed iron sources has the better electrochemical performance, it has a discharge capacity of 126.1mAh/g at 0.2C and the capacity is kept at 113.8mAh/g after 20 cycles.

Adsorption Study of Carbonate Hydroxylapatite for Hexavalent Chromium Ion from Aqueous Solution at Different Carbon Content

2011 ◽  
Vol 233-235 ◽  
pp. 1560-1563
Author(s):  
Hai Rong Yin ◽  
Ming Zhen Yang ◽  
Tao Wang ◽  
Min Ge Feng
Keyword(s):  
Aqueous Solution ◽  
Carbon Content ◽  
Adsorption Capacity ◽  
Hexavalent Chromium ◽  
Ph Value ◽  
Adsorption Study ◽  
Adsorption Time ◽  
Chromium Ion ◽  
Carbonate Hydroxylapatite

The adsorption of Cr6+ from aqueous solution by carbonate hydroxylapatite (CHAP) with different carbon content synthesized by precipitation. The CHAP was characterized and analyzed by TEM、FTIR and XRD. And adsorption was effected by the pH value、CHAP usage、adsorption time and other factors. The results show that under certain conditons, adsorption capacity enhanced with the carbon content increasing.

scholarly journals Effect of PVP Coating on LiMnBO3 Cathodes for Li-Ion Batteries

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5528
Author(s):  
Bolong Hong ◽  
Xiangming He ◽  
Huihua Yi ◽  
Chenglin Hu
Keyword(s):  
High Capacity ◽  
Lithium Ion ◽  
Particle Growth ◽  
Li Ion Batteries ◽  
Ion Diffusion ◽  
Solid State Method ◽  
Structure Morphology ◽  
Carbon Additives ◽  
Li Ion ◽  
Lithium Ion Diffusion

LiMnBO3 is a potential cathode for Li-ion batteries, but it suffers from a low electrochemical activity. To improve the electrochemical performance of LiMnBO3, the effect of polyvinyl pyrrolidone (PVP) as carbon additive was studied. Monoclinic LiMnBO3/C and LiMnBO3-MnO/C materials were obtained by a solid-state method at 500 °C. The structure, morphology and electrochemical behavior of these materials are characterized and compared. The results show that carbon additives and ball-milling dispersants affect the formation of impurities in the final products, but MnO is beneficial for the performance of LiMnBO3. The sample of LiMnBO3-MnO/C delivered a high capacity of 162.1 mAh g−1 because the synergistic effect of the MnO/C composite and the suppression of the PVP coating on particle growth facilitates charge transfer and lithium–ion diffusion.

Adsorption of Cesium from Aqueous Solution by Modified Montmorillonite

2013 ◽  
Vol 395-396 ◽  
pp. 591-594
Author(s):  
Si Man Liu ◽  
Yong Zhou Quan
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Influence Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Cesium Ions ◽  
Modified Montmorillonite ◽  
Adsorption Temperature ◽  
As Adsorption

The modified montmorillonite is used to adsorb cesium ions from aqueous solution. The influence factors such as adsorption time, adsorption temperature, adsorption pH, adsorbent dosage and initial concentration was studied in the experiment. The results show the optimum adsorption time is 100 min, the best adsorption temperature is 50 °C, and pH value is 10. When the concentration of cesium ions is 160 mg/L, the adsorption capacity can be up to 9.217 mg/g.

The Study of Modified Straw Carbon and Absorbing Phenol in Wastewater

2014 ◽  
Vol 889-890 ◽  
pp. 1613-1616
Author(s):  
Jian Li Yang ◽  
Mei Li Du ◽  
Wei Yan
Keyword(s):  
Hydrogen Peroxide ◽  
Ph Value ◽  
Wastewater Discharge ◽  
Phenol Content ◽  
Liquid Ratio ◽  
Adsorption Time ◽  
Adsorption Performance ◽  
Performance Results ◽  
Solid Liquid

The straw carbon is made by straw stalk (carbon plant corn, wheat, etc) gasified and dry distillated in 1,200°C. The experiment disscusses performance of straw carbon absorbing phenol in different conditions (time, dosage, temperature, pH value), and modified straw carbon in different conditions to improve its adsorption performance. Results show that the best conditions for straw carbon absorbing phenol is: amount ratio of phenol and straw carbon is 0.84mg/g (C phenol = 30mg/L), temperature is 35°C, pH value is 9, the best adsorption time is 5h.The optimal modified conditions is: modified with hydrogen peroxide, solid-liquid ratio is 1:1. The phenol content in simulation wastewater is only 0.47mg/L after absorbed by modified straw carbon. It is in line with GB 8978-1996 wastewater discharge standards.

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