Adsorption of CuCl2 on Mg-Al HTlc: Effect of EDTA and Addition Sequences

2012 ◽  
Vol 573-574 ◽  
pp. 150-154
Author(s):  
Yun Bo Zang ◽  
Nai Ying Wu
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Contact Time ◽  
Room Temperature ◽  
Copper Ions ◽  
Sorption Process ◽  
Langmuir Model ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Pseudo Second Order

In this study, removal of copper ions from aqueous solutions by synthetic Mg-Al-HTlc was investigated as a function of contact time, EDTA and addition sequences at room temperature. It is found that HTlc could reduced copper ions concentration effectively. The kinetics closely fit pseudo-second order kinetics with necessary time 9 h to reach equilibrium. The sorption process followed langmuir model. The maximum sorption capacity calculated was found to be 39.4 mg/g. The presence of EDTA and addition sequences could affect sorption of Cu(II) onto HTlc.

Development and application of carbon nanotubes reinforced hydroxyapatite composite in separation of Co(II) and Eu(III) ions from aqueous solutions

2018 ◽  
Vol 107 (1) ◽  
pp. 67-82 ◽  
Author(s):  
Reda R. Sheha ◽  
Saber I. Moussa ◽  
Mohamed A. Attia ◽  
Sedeeq A. Sadeek ◽  
Hanan H. Someda
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Contact Time ◽  
Packed Column ◽  
Maximum Sorption Capacity ◽  
Hydroxyapatite Composite ◽  
Maximum Sorption ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Abstract Multi-walled carbon nanotubes/strontium hydroxyapatite (MWCNT/SH) composite was synthesized, where CNTs were applied to improve the properties of HAP and increase the reinforcement of the composite. The composite CNTs/Sr-HAP and its precursor Sr-HAP were successfully applied in removal of Co(II) and Eu(III) ions from aqueous solutions. Sorption of Co(II) and Eu(III) onto the synthesized sorbents was investigated as a function of contact time and pH. The synthesized sorbents highly removed the studied radionuclides from their aqueous solutions with necessary time of 6 h to reach equilibrium. The maximum sorption capacity was 33.31 and 48.93 mg g−1 for Co(II) sorption onto Sr-HAP and CNTs/Sr-HAP composite at pH 4.5, while it was 115.74 and 127.11 mg g−1 for sorption of Eu(III) onto Sr-HAP and CNTs/Sr-HAP composite at pH 2.5, respectively. Desorption of Co(II) and Eu(III) from loaded samples was studied using various eluents and maximum recovery was obtained using FeCl3 and HCl solutions. Co(II) was completely separated from Eu(III) by a ratio of 85.1 % using Cd(NO3)2 as an eluent in CNTs/Sr-HAP composite packed column.

THE INFLUENCE OF CHITOSAN FLAKE DEACETYLATION DEGREE ON ORTHOPHOSPHATE SORPTION EFFICIENCY FROM AQUEOUS SOLUTIONS

2018 ◽  
Vol XXIII ◽  
pp. 33-44 ◽  
Author(s):  
Paula Bugajska ◽  
Urszula Filipkowska ◽  
Tomasz Jóźwiak ◽  
Małgorzata Kuczajowska-Zadrożna
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Ph Value ◽  
Sorption Process ◽  
Phosphorus Compounds ◽  
Desorption Process ◽  
Maximum Sorption Capacity ◽  
Deacetylation Degree ◽  
Maximum Sorption ◽  
Sorption From Aqueous Solutions

The article presents the effectiveness of orthophosphate sorption from aqueous solutions depending on the deacetylation degree of chitosan flakes. The first stage of the research was to determine the pH value at which the sorption process was the most effective (from the pH range 2–11). In the second stage, research was carried out to determine the maximum sorption capacities of chitosan with deacetylation degrees of 75%, 85% and 90% in relation to PO43-. The highest effectiveness of orthophosphate removal on chitosan, regardless of its deacetylation degree, was obtained at pH 4. At pH 2 and 3, the chitosan flakes dissolved. This study showed that the sorption effectiveness of phosphorus compounds depends on the deacetylation degree of chitosan. Along with the increase in deacetylation degree, the sorption capacity of chitosan also increases in relation to orthophosphates. It is related to the higher number of amino groups in the structure of chitosan, which are responsible for the sorption of pollutants in the form of anions. The maximum sorption capacity of chitosan-DD = 75% in relation to biogen was 5.13 mg/g, chitosan-DD = 85% was 5.65 mg/g, and chitosan-DD = 90% was 5.91 mg/g. After 60 minutes, the desorption process had begun and was most likely caused by an increase in the pH of the solution. Due to chitosan's ability to neutralise the sample and the associated risk of desorption, the time of sorbent contact with sewage cannot be longer than 60 minutes.

Sorption of Cd2+ Ions From Aqueous Solutions on Organic Wastes / Sorpcja Jonów Cd2+ Z Roztworów Wodnych Na Odpadach Organicznych

2015 ◽  
Vol 60 (3) ◽  
pp. 677-686
Author(s):  
Agnieszka Bożęcka ◽  
Stanisława Sanak-Rydlewska
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Organic Wastes ◽  
Langmuir Model ◽  
Natural Sorbent ◽  
Maximum Sorption Capacity ◽  
Walnut Shells ◽  
Maximum Sorption

Abstract This article presents the results of research on the Cd2+ ions sorption from model aqueous solutions on sunflower hulls, walnut shells and plum stones. The effect of various factors, such as mass of the natural sorbent, the pH, the time and the temperature was studied. The process of Cd2+ ions sorption on studied sorbents was described by the Langmuir model. The best sorption capacity has been achieved for sunflower hulls. The maximum sorption capacity for this material was 19.93 mg/g.

scholarly journals THE INFLUENCE OF THE DEACETYLATION DEGREE OF CHITOSAN IN THE FORM OF FLAKES ON THE EFFECTIVENESS OF NITRATES V SORPTION FROM AQUEOUS SOLUTIONS

2018 ◽  
Vol XXIII ◽  
pp. 88-96
Author(s):  
Tomasz Jóźwiak ◽  
Urszula Filipkowska ◽  
Paula Bugajska ◽  
Małgorzata Kuczajowska-Zadrożna ◽  
Artur Mielcarek
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Process Time ◽  
Effect Of Ph ◽  
Maximum Sorption Capacity ◽  
Degree Of Deacetylation ◽  
Deacetylation Degree ◽  
Maximum Sorption ◽  
Sorption From Aqueous Solutions

The influence of the degree of deacetylation of chitosan from the range of DD = 75–90% on the effectiveness of sorption of nitrates from aqueous solutions was investigated. The scope of the research included: determining the effect of pH on the effectiveness of N-NO3 binding on chitosan sorbents and determining the sorption capacity of chitosan sorbents with different degrees of deacetylation after 5, 15, 30 and 60 minutes. The effectiveness of sorption of nitrates on chitosan sorbents increased in the series DD=75% < DD=85% < DD=90%. Regardless of the degree of deacetylation, the sorption effectiveness of nitrates on chitosan was the highest at pH 4. The amount of nitrate-related sorbents was the highest after 30 min of sorption. A process time which was too long resulted in desorption of nitrates. The maximum sorption capacity for chitosan with the degree of deacetylation DD = 75, 85 and 90% was 0.59 mg N-NO3/g, 0.60 mg N-NO3/g and 0.87 mg N-NO3/g, respectively.

scholarly journals Sorption and Desorption Studies of Pb(II) and Ni(II) from Aqueous Solutions by a New Composite Based on Alginate and Magadiite Materials

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 340 ◽  
Author(s):  
Keltoum Attar ◽  
Hary Demey ◽  
Djamila Bouazza ◽  
Ana Sastre
Keyword(s):  
Composite Material ◽  
Contact Time ◽  
Langmuir Model ◽  
Dilute Solution ◽  
Maximum Sorption ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Order Rate Equation ◽  
Alginate Matrix ◽  
Nitrate Solutions

A new composite material based on alginate and magadiite/Di-(2-ethylhexyl) phosphoric acid (CAM-D2EHPA) was successfully prepared by previous impregnation of layered magadiite with D2EHPA extractant, and then immobilized into the alginate matrix. Air dried beads of CAM-D2EHPA were characterized by FTIR and SEM–EDX techniques. The sorbent was used for the separation of lead and nickel from nitrate solutions; the main parameters of sorption such as contact time, pH of the solution, and initial metal concentration were studied. The beads recovered 94% of Pb(II) and 65% of Ni(II) at pH 4 from dilute solutions containing 10 mg L−1 of metal (sorbent dosage, S.D. 1 g L−1). The equilibrium data gave a better fit using the Langmuir model, and kinetic profiles were fitted using a pseudo-second order rate equation. The maximum sorption capacities obtained (at pH 4) were 197 mg g−1 and 44 mg g−1 for lead and nickel, respectively. The regeneration of the sorbent was efficiently carried out with a dilute solution of HNO3 (0.5 M). The composite material was reused in 10 sorption–elution cycles with no significant differences on sorption uptake. A study with synthetic effluents containing an equimolar concentration of both metals indicated a better selectivity towards lead ions.

scholarly journals Application of Polyaniline Nano Composite for the Adsorption of Acid Dye from Aqueous Solutions

2012 ◽  
Vol 9 (3) ◽  
pp. 1266-1275 ◽  
Author(s):  
J.Raffiea Baseri ◽  
P.N. Palanisamy ◽  
P. Sivakumar
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Langmuir Model ◽  
Batch Adsorption ◽  
Adsorption System ◽  
Acid Dye ◽  
Order Model ◽  
Nano Composite ◽  
Pseudo Second Order ◽  
Acid Violet

In this research, Polyaniline coated sawdust (Polyaniline nano composite) was synthesized via direct chemical polymerization and used as an adsorbent for the removal of acid dye (Acid Violet 49) from aqueous solutions. The effect of some important parameters such as pH, initial concentration of dye, contact time and temperature on the removal efficiency was investigated in batch adsorption system. The adsorption capacity of PAC was high (96.84 %) at a pH of 3-4. The experimental data fitted well for pseudo second order model. Langmuir model is more appropriate to explain the nature of adsorption with high correlation coefficient. The Energy of activation from arrehenius plot suggested that the adsorption of AV49 onto PAC involves physisorption mechanism.

Removal of Mercury From Aqueous Solutions by ETS-4 Microporous Titanosilicate: Effect of Contact Time, Titanosilicate Mass and Initial Metal Concentration

2007 ◽  
Author(s):  
C. B. Lopes ◽  
M. Otero ◽  
Z. Lin ◽  
E. Pereira ◽  
C. M. Silva ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Sorption Process ◽  
Exchange Equilibrium ◽  
Toxic Heavy Metals ◽  
Experimental Conditions ◽  
Freundlich Isotherms ◽  
Pseudo Second Order ◽  
Microporous Titanosilicate

Mercury is one of the most toxic heavy metals present in the environment and therefore is extremely important develop new, simple and reliable techniques for its removal from aqueous solutions. A recent line of research within this context is the application of microporous materials. The use of these materials for removing heavy metals from solutions may become a potential clean-up technology in the field of wastewater treatment. In this work it is reported the application of microporous titanosilicate ETS-4 as ion exchanger to remove Hg2+ from aqueous solution. Under batch conditions, we studied the effect of contact time, titanosilicate mass and initial Hg2+ concentration. Only 5 mg of ETS-4 are required to purify 2 litres of water with 50 μg L−1 of metal. Under the experimental conditions, the initial Hg2+ concentration and ETS-4 mass have strong influence on the sorption process, and it is proved that 24 h are almost always sufficient to attain ion exchange equilibrium. Langmuir and Freundlich isotherms were used to fit equilibrium experimental results. The kinetics of mercury removal was reliably described by a pseudo second-order model. On the whole, ETS-4 shows considerable potential to remove Hg2+ from wastewaters.

Sorption of thallium(I) ions by peat

2013 ◽  
Vol 68 (10) ◽  
pp. 2208-2213 ◽  
Author(s):  
Artis Robalds ◽  
Maris Klavins ◽  
Liga Dreijalte
Keyword(s):  
Sorption Capacity ◽  
Batch Mode ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Pseudo Second Order ◽  
Copper Zinc ◽  
Industrial Use ◽  
Kinetics Of ◽  
Kinetics Of Sorption ◽  
Effective Sorbent

The increasing industrial use of thallium has raised the need for removal of this highly toxic element from wastewater. Thallium is more toxic than cadmium, copper, zinc, lead and mercury and as it is easily accumulated in humans, animals and plants, it poses a threat to both the environment and human health. Peat has been used as an effective, relatively cheap and easily available sorbent to treat waters containing heavy metals. In this study, peat was characterized and used as sorbent for the removal of Tl(I) ions from aqueous solution. The effect of initial Tl(I) concentration, pH, contact time, temperature and ionic strength was studied in batch mode. The maximum sorption capacity of peat reached 24.14 mg/g at 20 °C and initial Tl(I) concentration of 500 mg/L. Sorption capacity was found to be pH dependent and maximum uptake occurred at pH 10. Kinetic data revealed that sorption was relatively rapid – 82.8% of Tl(I) ions were sorbed in the first 10 min. The kinetics of sorption was analyzed using pseudo-first order and pseudo-second order models. Results show that peat can be used as an effective sorbent to remove Tl(I) ions from aqueous solutions.

An application research for near-surface repository of strontium-90 sorption kinetic model on mudrocks

Kerntechnik ◽  
2021 ◽  
Vol 86 (6) ◽  
pp. 404-410
Author(s):  
Y. Shi ◽  
W. Chen ◽  
H. Lin ◽  
Z. Gao ◽  
B. Yang ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Sorption Capacity ◽  
Rate Constant ◽  
Local Environment ◽  
Sorption Process ◽  
Sorption Kinetic ◽  
Near Surface ◽  
Maximum Sorption Capacity ◽  
Groundwater Environment ◽  
Maximum Sorption

Abstract In this study,90Sr was used as the test radionuclide to characterize the sorption kinetics and effects of initial 90Sr activity and remaining 90Sr in solid concentration were simulated for a near-surface repository. The study focused on the sorption characteristics of radionuclides in unsaturated groundwater environment (or vadose zone) is the important information for investigating the near-surface disposal of intermediate and low-level radioactive waste (ILLW). Moreover, the 90Sr sorption experiments reached equilibrium within 56 h, which fit to the first order sorption kinetic model, and the remaining 90Sr in mudrock samples showed obvious sorption equilibrium hysteresis, which fit to the second order sorption kinetic model. Before reaching the maximum sorption capacity, the sorption rate constant increases with 90Sr increasing; the distribution coefficient (Kd) of 56 h decreases with the remaining 90Sr decreasing. In addition, it showed that the slow sorption process dominated before the sorption reaches equilibrium. In fact, a reliable safety assessment methodology for on-going near-surface repository required a lot of the radionuclides parameters with local environment including the radionuclides sorption/desorption rate constant and maximum sorption capacity.

Co-Sorption Characteristics of Zn(II) and As(V) on Mixed Fe/Al-PILCs

2013 ◽  
Vol 681 ◽  
pp. 26-30
Author(s):  
Su Yuan Wu ◽  
Hong Zheng ◽  
Peter G. Weidler ◽  
Peng Cai
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Contact Time ◽  
Room Temperature ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Single System ◽  
Batch System ◽  
Maximum Sorption ◽  
Sorption Characteristics

Co-sorption characteristics of Zn(II) and As(V) on the mixed Fe/Al-PILCs was investigated in a batch system at room temperature. The effects of relevant parameters, such as pH value of solution, adsorbent dosage, initial Zn(II) and As(V) concentrations and contact time were examined, respectively. The results show that co-sorption capacities and co-sorption rates of Zn(II) and As(V) by Fe/Al-PILC are higher and faster than those of single Zn(II) or single As(V) by Fe/Al-PILC. Co-sorption isotherm data of Zn(II) and As(V) by Fe-Al-PILC were fitted well to Langmuir isotherm and the maximum sorption capacities of Zn(II) and As(V) on mixed Fe-Al-PILCs (Q0) are 16.98 mg/g and 16.29 mg/g, respectively, which are higher than those in single system. n>1 from Freundlich isotherm indicate that the sorption of Zn(II) and As(V) by Fe-Al-PILC is favorable. E values from D-R model indicate that the type of sorption of Zn(II) and As(V) by Fe-Al-PILC is physical. The results indicate that there is significant potential for Fe/Al-PILCs as an adsorbent material for Zn(II) and As(V) removal from aqueous solutions.

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