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.

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.

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.

Characterization of Fe3O4@CS@NMDP magnetic nanoparticles with core–shell structure prepared by chemical cross-linking method

2017 ◽  
Vol 10 (05) ◽  
pp. 1750056 ◽  
Author(s):  
Huiping Shao ◽  
Jiangcong Qi ◽  
Tao Lin ◽  
Yuling Zhou ◽  
Fucheng Yu
Keyword(s):  
Magnetic Nanoparticles ◽  
Shell Structure ◽  
High Performance ◽  
Cross Linking ◽  
Composite Particles ◽  
Core Shell ◽  
The Core ◽  
Targeting Delivery ◽  
Core Shell Structure ◽  
Chemical Cross Linking

The core–shell structure composite magnetic nanoparticles (NPs), Fe3O4@chitosan@nimodipine (Fe3O4@CS@NMDP), were successfully synthesized by a chemical cross-linking method in this paper. NMDP is widely used for cardiovascular and cerebrovascular disease prevention and treatment, while CS is of biocompatibility. The composite particles were characterized by an X-ray diffractometer (XRD), a Fourier transform infrared spectroscopy (FT-IR), a transmission electron microscopy (TEM), a vibrating sample magnetometers (VSM) and a high performance liquid chromatography (HPLC). The results show that the size of the core–shell structure composite particles is ranging from 12[Formula: see text]nm to 20[Formula: see text]nm and the coating thickness of NMDP is about 2[Formula: see text]nm. The saturation magnetization of core–shell composite NPs is 46.7[Formula: see text]emu/g, which indicates a good potential application for treating cancer by magnetic target delivery. The release percentage of the NMDP can reach 57.6% in a short time of 20[Formula: see text]min in the PBS, and to 100% in a time of 60[Formula: see text]min, which indicates the availability of Fe3O4@CS@NMDP composite NPs for targeting delivery treatment.

Removal of Mercury from Wastewater by Adsorption Using Thiol-Functionalized Eggshell Membrane

2010 ◽  
Vol 113-116 ◽  
pp. 22-26 ◽  
Author(s):  
Xian Zhong Cheng ◽  
Cun Jie Hu ◽  
Kuang Cheng ◽  
Ben Mei Wei ◽  
Shen Cai Hu
Keyword(s):  
Adsorption Capacity ◽  
Functional Groups ◽  
Ph Value ◽  
Thioglycolic Acid ◽  
Eggshell Membrane ◽  
The Novel ◽  
Batch Experiments ◽  
Mercury Ions ◽  
Maximum Capacity ◽  
Removal And Recovery

The thiol-functionalized eggshell membrane (TF-ESM) was prepared by esterification between thioglycolic acid (CH2SHCOOH) and oxygen-containing functional groups on eggshell membrane (ESM). A promising potential biosorbent, TF-ESM, was used for the removal of toxic mercury in wastewater. Aqueous of mercury ions removing properties by TF-ESM were studied through batch experiments. The results indicated that the modified ESM has greatly enhanced the adsorption capacity for Hg2+, the maximum capacity was increased more than 3-fold in comparison with the unmodified ESM, from 19.4 mg g-1 to 71.9 mg g-1. The optimum of pH value for Hg adsorption was in the range of 2-8, which the removing rate over 96%. The results obtained show that the novel thiol-functionalized eggshell membrane performed well the removal and recovery of mercury from low concentration wastewaters.

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.

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.

Dye Adsorbent Prepared by Crosslinking of Poly(γ-glutamic acid) and Gelatin

2014 ◽  
Vol 989-994 ◽  
pp. 809-813
Author(s):  
Wei Wang ◽  
Shu Ping Liu ◽  
Hua Nan Guan ◽  
Jin Zhong Liang ◽  
Chong Tan
Keyword(s):  
Glutamic Acid ◽  
Rhodamine B ◽  
Ph Value ◽  
Dye Adsorption ◽  
Cross Linking ◽  
Adsorption Effect ◽  
Amide Bonds ◽  
Adsorption Performance ◽  
Adsorption Capability

The present paper describes the preparation of novel biodegradable adsorbent based on cross-linking of poly (γ-glutamic acid) (γ-PGA) and gelatin and characterization of its Rhodamine B dye adsorption capability. Cross-linking effect was measured with the effect of adsorbent adsorbing ionic dyes Rhodamine B. In the experiment, the various factors which had influence on the adsorption effect, including preparationtemperature, preparation pH value, concentrations of cross-linking agent, cross-linking time were analyzed. The results showed that the adsorbent had good adsorption performance after cross-linking. The adsorbent was characterized by fourier transform infrared spectrum (FTIR), revealing that there were amide bonds between gelatin and poly (γ-glutamic acid) by cross-linking reaction.

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.

Preparation and Adsorption Performance of Cu (II)-Imprinted ALG-CTS Complex Microspheres

2012 ◽  
Vol 268-270 ◽  
pp. 229-232 ◽  
Author(s):  
Wei Ying Zhang ◽  
Dan Chen ◽  
Xiao Li ◽  
Xiao Guang Ying
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ionic Interaction ◽  
Experimental Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Performance ◽  
Series Of Experiments ◽  
Equilibrium Adsorption Isotherm

We prepared alginate-chitosan (ALG-CTS) complexes through ionic interaction, and then obtained Cu (II)-imprinted alginate-chitosan complex microspheres (Cu-ALG-CTS) by coupling with ionic imprinting technology. To investigate the effects of experimental conditions on adsorption behavior, we performed a series of experiments including changing the initial concentration of Cu (II) ions and adsorption time. We found that the adsorption capacity increases with the initial concentration of Cu (II) ions. The Cu (II) ions adsorption reaches the maximum of 70.54mg/g after adsorbing for 13h when the initial concentration of Cu (II) ions is 60μg/ml. Cu-ALG-CTS shows much higher adsorption for Cu (II) ions than Zn (II) ions. And the adsorption kinetics and equilibrium adsorption isotherm were further studied.

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