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.

Adsorption of Two Heavy Metal Ions on Dry Garlic Stem

2011 ◽  
Vol 396-398 ◽  
pp. 2443-2446
Author(s):  
Neng Zhou ◽  
Zhen Zhou ◽  
Yuan Qin ◽  
Chu Jie Zeng ◽  
Zu Qiang Huang
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Heavy Metal Ions ◽  
Adsorption Rate ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Experimental Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature

This study reported the feasibility of adsorption of heavy metals using dry garlic stem, an environmentally-friendly and natural adsorbent．Using batch adsorption technique, the efficiency of the adsorbent was studied under different experimental conditions by varying parameters such as pH, initial concentration and contact time. The results show that at pH 2.03, adsorption temperature 35°C, the adsorption time 90 min and the amount of garlic stem 1.0 g, Pb2+ have the maximum adsorption capacity. The maximum adsorption capacity of the Pb2+ on garlic stem is 28.42 mg/g and the adsorption rate is 94.74%. At pH 4.05, the adsorption time 120 min and the amount of garlic stem 1.0, Cu2+ have the maximum adsorption at the same temperature. The maximum adsorption of the Cu2+ is 20.90 mg/g and the adsorption rate is 69.75%. The dry garlic stem was found to be efficient in removing lead and copper from aqueous solution as compared to other adsorbents already used for the removal of these ions.

Adsorption of Cr(VI) from Aqueous Solution by Ethylenediaminetetraacetic Acid-Chitosan-Modified Metal-Organic Framework

2020 ◽  
Vol 20 (3) ◽  
pp. 1660-1669 ◽  
Author(s):  
Yu-Ying Deng ◽  
Xin-Feng Xiao ◽  
Dan Wang ◽  
Bo Han ◽  
Yu Gao ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Single Molecule ◽  
Ethylenediaminetetraacetic Acid ◽  
Metal Organic Framework ◽  
Concentration Effects ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Metal Organic ◽  
Organic Framework

Cu-BTC was synthesised by hydrothermal method in this study to adsorb and remove the toxic heavy metal hexavalent chromium Cr(VI) in water. The EDTA-chitosan/Cu-BTC was prepared by the surface modification of Cu-BTC with EDTA-modified chitosan. The initial concentration effects of adsorbed chromium solution, adsorbent dosage, adsorption time, adsorption temperature and pH of chromium solution on adsorption capacity were estimated using the single-factor optimisation experiment. Results show that the adsorption capacity of the modified composite was higher than that of Cu-BTC. Cu-BTC and EDTA-chitosan/Cu-BTC exhibited significant adsorption of Cr(VI) under acidic conditions in water and basically independent of temperature. Their adsorption processes conformed with the pseudo-second-order model. The Langmuir adsorption isotherm model obtained the adsorption isotherm, which indicated that the adsorption process was single molecule adsorption. Isotherm fitting obtained the maximum adsorption amounts of Cr(VI) for Cu-BTC and EDTA-chitosan/Cu-BTC at 27.32 and 46.51 mg·g-1, respectively. Factor and principal component analyses show that the main factors affecting the adsorption of Cr(VI) in the EDTA-chitosan/Cu-BTC composites are pH, initial concentration and adsorption time. Therefore, EDTA-chitosan-modified Cu-BTC was a more feasible metal-organic framework material than Cu-BTC because of better adsorption performance, which can be used for adsorption removal of Cr(VI) in water.

Adsorption of Cr(VI) from Aqueous Solution by two Kinds of Pillared Bentonites

2013 ◽  
Vol 690-693 ◽  
pp. 1037-1040
Author(s):  
Zhen Wang ◽  
Ze Sheng Cheng ◽  
Yu Liu ◽  
Na Na Bo ◽  
Shu Ping Li
Keyword(s):  
Aqueous Solution ◽  
Sem Analysis ◽  
Optimum Conditions ◽  
Experimental Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Performance ◽  
Better Than

The hydroxy-aluminum pillared bentonite(OH-Al-bent) and aluminum pillared bentonite(Al-bent) were synthesized and characterized by XRD and SEM analysis. The yield of products and the adsorbent capabilities for Cr(Ⅵ) from aqueous solution were investigated, and the optimal experimental conditions including adsorption time, reagent dosage, the initial concentration of Cr(Ⅵ) and PH that might influent the adsorption performance were also investigated. It was observed that the adsorption capabilities of OH-Al-bent was better than Al-bent. The efficiency of Cr(Ⅵ) removal were better when the dosage of the sorbent was higher. And a reagent dosage of 7g/L, adsorption time of 60min, PH of 4 were selected as an optimum conditions.

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.

scholarly journals THE STUDY OF ADSORPTION CAPACITY ON BONE CHAR IN WASTEWATER TREATMENT CONTAINED ARSENIC ION

2020 ◽  
Vol 39 (03) ◽  
Author(s):  
VO THANH CONG ◽  
DO QUY DIEM ◽  
NGUYEN VAN SON
Keyword(s):  
Wastewater Treatment ◽  
Optimal Condition ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Bone Char ◽  
Positive Research ◽  
Arsenic Adsorption ◽  
Experimental Performance ◽  
Adsorption Time ◽  
Initial Concentration

Wastewater treatment is one of the urgent and important issues in environmental protection. Nowadays, many methods to treat wastewater in industry were found to which adsorption applied as an effective method. Among possible adsorbents, bone char appeared to be of important application especially for heavy metals. In this study, we are applied char bone char sample as an adsorbent at optimal condition on previous investigation to adsorb arsenic ion (type of As5+ ion) contained in wastewater. The detail in experimental performance, the initial concentration, capacity adsorption, and adsorption time at optimal condition of arsenic ion solution were examined. The results of arsenic adsorption process were found that the optimization of initial concentration to be As5 sample with adsorption capacity of 0.124 mg arsenic ion/g bone char at time of 60 minute. In addition, the optimal adsorption time on As5 sample was also determined as 90 minutes with capacity adsorption of 0.02 mg arsenic ion/ g bone char. The positive research results of the adsorption on bone char have pointed out a possible application of bone char as an adsorbent in future.

scholarly journals Fabrication of Highly Porous Polymeric Nanocomposite for the Removal of Radioactive U(VI) and Eu(III) Ions from Aqueous Solution

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2940
Author(s):  
Tansir Ahamad ◽  
Mu. Naushad ◽  
Mohd Ubaidullah ◽  
Saad Alshehri
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Water Solution ◽  
High Surface ◽  
Basic Medium ◽  
Batch Adsorption ◽  
Regeneration Ability ◽  
Contaminated Water ◽  
Polymeric Nanocomposite

In the present study, a polymeric nanocomposite, CoFe2O4@DHBF, was fabricated using 2,4 dihydroxybenzaldehyde and formaldehyde in basic medium with CoFe2O4 nanoparticles. The fabricated nanocomposite was characterized using FTIR, TGA, XRD, SEM, TEM, and XPS analyses. The analytical results revealed that the magnetic nanocomposite was fabricated successfully with high surface area 370.24 m2/g. The fabricated CoFe2O4@DHBF was used as an efficient adsorbent for the adsorption of U(VI) and Eu(III) ions from contaminated water. pH, initial concentration, adsorption time, and the temperature of the contaminated water solution affecting the adsorption ability of the nanocomposites were studied. The batch adsorption results exposed that the adsorption capacity for the removal of U(VI) and Eu(III) was found to be 237.5 and 225.5 mg/g. The adsorption kinetics support that both the metal ions follow second order adsorption kinetics. The adsorption isotherm well fits with the Langmuir adsorption isotherm and the correlation coefficient (R2) values were found to be 0.9920 and 0.9913 for the adsorption of U(VI) and Eu(III), respectively. It was noticed that the fabricated nanocomposites show excellent regeneration ability and about 220.1 and 211.3 mg/g adsorption capacity remains with U(VI) and Eu(III) under optimum conditions.

Preparation and Utilization of Lignin Ionic Adsorbent for the Removal of Cr(VI) from Aqueous Solution

2012 ◽  
Vol 588-589 ◽  
pp. 47-50
Author(s):  
Ze Sheng Cheng ◽  
Zhen Wang ◽  
Yu Liu ◽  
Na Na Bo
Keyword(s):  
Aqueous Solution ◽  
Quaternary Ammonium ◽  
Organic Medium ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Alkali Lignin ◽  
Adsorption Performance ◽  
Lignin Modification ◽  
As Adsorption ◽  
Better Than

Alkali lignin, Modification, Quaternary ammonium salt, Cr(Ⅵ), Anion adsorbent Abstract. LIA(lignin ionic adsorbent) was synthesized by modified alkali lignin after reaction with epichlorohydrin and dimethylamine or diethylamine by using the modifying agents of N-methylmorpholine (NMM) in the presence of organic medium of N,N-dimethylformamide(DMF). The LIA was characterized by FTIR spectroscopy and elements analysis， the yield of products and the adsorbent capabilities for Cr(Ⅵ) from aqueous solution were also exploited. The factors that might influent the adsorption performance were investigated, such as adsorption time, reagent dosage and the initial concentration of Cr(Ⅵ). It was found that the efficiency of Cr(Ⅵ) removal were better when the amount of the sorbent was increased. But the removal efficiency was reduced as the initial concentration of Cr(Ⅵ) increased. The contrast result of the two synthesis processes also proved the yields of sample 3 (modified alkali lignin using diethylamine) was higher than sample 2 (modified alkali lignin using dimethylamine). And the adsorption capabilities of sample 3 were also better than sample 2.

Multi Wall Carbon Nanotube Surface Modification and Adsorption Performance of Cu2+

2013 ◽  
Vol 295-298 ◽  
pp. 1227-1230 ◽  
Author(s):  
Reyila Abuduwayiti ◽  
Cheng Tun Qu ◽  
Tao Yu ◽  
Bo Yang
Keyword(s):  
Carbon Nanotubes ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Effect Factors ◽  
Initial Concentration ◽  
Mixed Acid ◽  
Adsorption Performance ◽  
Capacity Change ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Mixed acid processed Multi-walled carbon nanotubes （MWCNTs）were used as adsorbent to adsorb Cu2+ in artificial wastewater in this . In this study, the effect factors of Cu2+ adsorption capacity, such as initial concentration of Cu2+, absorbent contact time and dosage, etc were investigated respectively in the solution at neutral pH. The results show that population of -OH is increased on surface of mixed acid processed MWCNTs; and at condition of 30 °C, pH 6，as the increase in concentration and contact time, there is an increase in adsorption capacity of two adsorbents(processed and unprocessed)，and the Cu2+ adsorption rate increased with the increase in adsorbent dosage. In addition, the considered adsorption capacity change was obtained when processed MWCNTs was used.

Study on Adsorption of Methylene Blue by the Montmorillonite/poly(γ-Glutamic Acid) Composite

2012 ◽  
Vol 554-556 ◽  
pp. 333-338
Author(s):  
Cai Ning Zhang ◽  
Xu Man Wang
Keyword(s):  
Methylene Blue ◽  
Glutamic Acid ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Experimental Results ◽  
Methylene Blue Solution ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Ph Values ◽  
Blue Solution

The composite was prepared with montmorillonite (MMT) and poly(γ-glutamic acid) (γ-PGA). Applied the composite as the sorbent, methylene blue as the adsorbate, the influences of the initial concentrations of methylene blue, adsorption time and pH values of the solution on the adsorption capacity of methylene blue by the composite were studied. The experimental results showed that the adsorption capacity of methylene blue by MMT/γ-PGA composite both increased with the increasing of initial concentration of methylene blue and the prolonging of adsorption time, and then approached saturation respectively. The adsorption capacity of methylene blue by MMT/γ-PGA composite increased with the increasing of pH values of methylene blue solution. Meanwhile, the study of adsorption mechanism demonstrated that the adsorption of methylene blue by MMT/γ-PGA composite was Langmuir type, and the adsorption equation wasΓ=0.204c/(1+0.381C).

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.

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