Adsorption of Strontium from Aqueous Solution Using Collagen Fiber Immobilized Tannins

2013 ◽  
Vol 726-731 ◽  
pp. 2107-2110 ◽  
Author(s):  
Han Zhou ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Collagen Fiber ◽  
Sorption Process ◽  
Ftir Analysis ◽  
Optimum Conditions ◽  
Absorption Data ◽  
Initial Concentration ◽  
Experimental Parameters ◽  
Optimum Ph

The removal of strontium from aqueous solution with collagen fiber immobilized tannins was studied. The effects of several experimental parameters such as pH, dosage, temperature, contact time and initial concentration of strontium on removal efficiency of strontium were investigated to determine the optimum conditions of strontium sorption process. The adsorbent was characterized by SEM and FTIR analysis. The results of regression analysis indicated that temperature parameters were not individually statistically significant for Sr2+ adsorption. However, the efficiency of strontium adsorption increased with the increase in pH and dosage. The adsorption capacity was increased with increasing initial concentration of Sr2+. The removal efficiency of Sr2+ was 49% at optimum pH of 6 and initial concentration of 20mg/L. Moreover, the absorption data were fitted well to the Langmuir sorption isotherm model.

scholarly journals Poly (furfural-acetone) as New Adsorbent for Removal of Cu(II) from Aqueous Solution: Equilibrium Study

2010 ◽  
Vol 7 (1) ◽  
pp. 157-165 ◽  
Author(s):  
Tariq S. Najim
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Sorption Process ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Initial Concentration ◽  
Equilibrium Study ◽  
Optimum Ph ◽  
Percent Removal

The batch removal of Cu(II) from aqueous solution using poly (furfural-acetone), (PFA) as adsorbent was investigated in this study. The influences of initial Cu(II) ion concentration (10 to 120 ppm), pH (4-8) and contact time have been reported. Adsorption of Cu(II) is highly pH-dependent and the result indicate that the optimum pH for the removal was found to be 6. At this pH a small amount of PFA, 2 g/L, could remove as much as 97% of Cu(II) from a solution of initial concentration 10 ppm. It was observed that an increase in initial concentration of Cu(II) leads to decrease in percent removal of Cu(II) and increase in amount of Cu(II) adsorbed per unit mass of PFA. The adsorption process of Cu(II) is tested with four isotherm models, Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D-R). It was found that all models were applicable and the maximum adsorption capacity was found to be 13.66 mg/g. From the isotherm constants it was confirmed that, the sorption process was physisorption.

Comparative Bio-sorption of Cadmium and Nickel Ions from Aqueous Solution onto Fibers of Date Palm using Fluidized Bed Column

2019 ◽  
Vol 70 (5) ◽  
pp. 1507-1512
Author(s):  
Baker M. Abod ◽  
Ramy Mohamed Jebir Al-Alawy ◽  
Firas Hashim Kamar ◽  
Gheorghe Nechifor
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Date Palm ◽  
Operating Conditions ◽  
Initial Concentration ◽  
Bed Height

The aim of this study is to use the dry fibers of date palm as low-cost biosorbent for the removal of Cd(II), and Ni(II) ions from aqueous solution by fluidized bed column. The effects of many operating conditions such as superficial velocity, static bed height, and initial concentration on the removal efficiency of metal ions were investigated. FTIR analyses clarified that hydroxyl, amine and carboxyl groups could be very effective for bio-sorption of these heavy metal ions. SEM images showed that dry fibers of date palm have a high porosity and that metal ions can be trapped and sorbed into pores. The results show that a bed height of 6 cm, velocity of 1.1Umf and initial concentration for each heavy metal ions of 50 mg/L are most feasible and give high removal efficiency. The fluidized bed reactor was modeled using ideal plug flow and this model was solved numerically by utilizing the MATLAB software for fitting the measured breakthrough results. The breakthrough curves for metal ions gave the order of bio-sorption capacity as follow: Cd(II)]Ni(II).

scholarly journals Evaluation of removal efficiency of residual diclofenac in aqueous solution by nanocomposite tungsten-carbon using design of experiment

2017 ◽  
Vol 76 (6) ◽  
pp. 1466-1473 ◽  
Author(s):  
M. H. Salmani ◽  
M. Mokhtari ◽  
Z. Raeisi ◽  
M. H. Ehrampoush ◽  
H. A. Sadeghian
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Design Of Experiment ◽  
High Efficiency ◽  
Carbon Powder ◽  
Batch Adsorption ◽  
Effective Parameters ◽  
Initial Concentration ◽  
Carbon Nanocomposite ◽  
Maximum Removal

Wastewater containing pharmaceutical residual components must be treated before being discharged to the environment. This study was conducted to investigate the efficiency of tungsten-carbon nanocomposite in diclofenac removal using design of experiment (DOE). The 27 batch adsorption experiments were done by choosing three effective parameters (pH, adsorbent dose, and initial concentration) at three levels. The nanocomposite was prepared by tungsten oxide and activated carbon powder in a ratio of 1 to 4 mass. The remaining concentration of diclofenac was measured by a spectrometer with adding reagents of 2, 2′-bipyridine, and ferric chloride. Analysis of variance (ANOVA) was applied to determine the main and interaction effects. The equilibrium time for removal process was determined as 30 min. It was observed that the pH had the lowest influence on the removal efficiency of diclofenac. Nanocomposite gave a high removal at low concentration of 5.0 mg/L. The maximum removal for an initial concentration of 5.0 mg/L was 88.0% at contact time of 30 min. The results of ANOVA showed that adsorbent mass was among the most effective variables. Using DOE as an efficient method revealed that tungsten-carbon nanocomposite has high efficiency in the removal of residual diclofenac from the aqueous solution.

scholarly journals Acid Blue 25 Removal by using Electro-Persulfate Process

2020 ◽  
Author(s):  
Zeinab Ghorbani
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Salt Concentration ◽  
Dye Removal ◽  
Industrial Effluents ◽  
Sodium Persulfate ◽  
Initial Concentration ◽  
Acid Blue 25 ◽  
Sulfate Process ◽  
Acid Blue

This study aimed to investigate the efficiency of the electro-persulfate process in removing acid blue 25 from aqueous solution. In order to optimize the parameters, the OFAT method was used, and the effect of three main parameters, including pH, sodium persulfate salt concentration, and current intensity was investigated. According to the results, the optimal removal efficiency of 94% in 60 minutes was obtained under conditions of pH=5, the initial concentration of sodium persulfate=250 mg / L, and the current=500 mA. According to the results of this study, the electro-persulfate process sulfate process can be an efficient process for dye removal from industrial effluents.

Investigation of Titania Addition into Tar Sands for Removal of Phenol from Aqueous Solutions

2006 ◽  
Vol 41 (1) ◽  
pp. 94-99 ◽  
Author(s):  
Lua'y Zeatoun ◽  
Munjed Al-Sharif ◽  
Abeer Al-Bsoul
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Sorption Process ◽  
The Other ◽  
Solution Temperature ◽  
Equilibrium Isotherm ◽  
Activation Temperature ◽  
Tar Sands ◽  
Initial Concentration ◽  
Initial Phenol Concentration

Abstract Tar sands were found to remove significant amounts of phenol from aqueous solution in the presence of titania; about 70% at an initial concentration of 10 ppm. Batch sorption experiments showed that phenol uptake was increased with either an increase in initial phenol concentration, percentage of titania in the sorbent or pre-activation temperature. On the other hand, the presence of soft ions such as sodium, Na+, or potassium, K+, or the increase of solution temperature suppressed the uptake of phenol. Physical pre-activation of the tar sands influenced the adsorption process positively. The sorption process appears to be exothermic and relatively fast; the equilibrium isotherm data were well represented by either Langmuir or Freundlich models.

CHEMICALLY MODIFIED KAPOK SAWDUST AS ADSORBENT OF METHYL VIOLET DYE FROM AQUEOUS SOLUTION

2016 ◽  
Vol 78 (9) ◽  
Author(s):  
Widi Astuti ◽  
Triastuti Sulistyaningsih ◽  
Masni Maksiola
Keyword(s):  
Aqueous Solution ◽  
Methyl Violet ◽  
Correlation Coefficients ◽  
Quasi Equilibrium ◽  
Batch Studies ◽  
Initial Concentration ◽  
Chemically Modified ◽  
Experimental Parameters ◽  
Equilibrium Data ◽  
Isotherm Equations

In this study, chemically modified Kapok sawdust was used as an adsorbent for the removal of methyl violet from aqueous solution. Batch studies were performed to address various experimental parameters including pH, contact time, and initial concentration for the removal of this dye. Effective pH for methyl violet removal was 5. A greater percentage of dye was removed with a decrease in the initial concentration of dye. Quasi-equilibrium reached in 30 min. Equilibrium isotherms were analyzed by Langmuir, Freundlich, and Redlich-Peterson isotherm equations using correlation coefficients and two different error functions. Freundlich equation is found to best represent the equilibrium data for methyl violet-modified Kapok sawdust system.

Phosphate Removal from Aqueous Solution Using Fly Ash Modified with Fe-Cu Bimetal Oxide

2013 ◽  
Vol 438-439 ◽  
pp. 42-45 ◽  
Author(s):  
Ke Xu ◽  
Xu Luo ◽  
Chun Guang Li ◽  
Jun Ling Niu
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Removal Efficiency ◽  
Langmuir Isotherm ◽  
Phosphate Removal ◽  
Experimental Results ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Ph Range ◽  
Modified Fly Ash

In this work the adsorption of phosphate using the Fe-Cu bimetal oxide modified fly ash was studied. The experimental results showed that phosphate could be effectively removed in the pH range between 4 and 10. The removal percentage of phosphate reached maximum at pH 6.0. The adsorption of phosphate by the modified fly ash was rapid, and the adsorption percentage of phosphate could reach 91.20% in 5 minutes. The removal efficiency of phosphate increased with the increase of adsorbent dosage and the decrease of the initial concentration. The adsorption of phosphate could be described well by Langmuir isotherm, the Langmuir constant Q0 was 26.03mg/g.

scholarly journals Research on the Degradation of Oxacillin in Water by Strong Ionization Discharge

2021 ◽  
Author(s):  
Rongjie Yi ◽  
Qi Zhang ◽  
Chengwu Yi
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Theoretical Basis ◽  
Input Voltage ◽  
Initial Concentration ◽  
Treatment Conditions ◽  
Effective Removal ◽  
Initial Ph ◽  
Strong Ionization Discharge ◽  
By Products

The degradation of oxacillin in aqueous solution by strong ionization dielectric barrier discharge (DBD) was explored. The effects of input voltage, initial pH, initial concentration of solution and hydroxyl (·OH) inhibitor on the removal efficiency of OXA were investigated. The results showed that the removal efficiency of OXA with initial concentration of 20mg/L reached 91.5% under the optimal treatment conditions of 3.8 kV and 7.3 pH. With the higher voltage and the lower initial concentration, the removal effect was better. The pH of the solution has little effect on the removal efficiency, and the removal effect is the best in neutral aqueous solution. The inhibition effect of TBA was stronger than that of CO32- and HCO3-. Moreover, ·OH was the main active substance in the process of strong ionization discharge, which played a major role in the removal of OXA. In addition, two main by-products were identified, the transformation pathways including hydroxylation (+16 Da), decarboxylation (-44 Da) were observed. This study provided a theoretical basis for the effective removal of antibiotics in water by strong ionization discharge.

scholarly journals Evaluate the effectiveness of the UV/ persulfate process to remove catechol from solution aqueous

2021 ◽  
Keyword(s):  
Data Analysis ◽  
Aqueous Solutions ◽  
Uv Radiation ◽  
Removal Efficiency ◽  
Design Of Experiment ◽  
Contact Time ◽  
Batch Reactor ◽  
Acidic Ph ◽  
Optimum Conditions ◽  
Optimum Ph

<p>Catechol is used as an antioxidant, fungicide, and polymerization inhibitors in a variety of industries such as petrochemical. Catechol must be removed from effluents before it enters to environment. This study aimed to investigate combined UV radiation and persulfate process in removal of catechol from aqueous solutions. All experiments were performed in a batch reactor. Data analysis were done with Design of Experiment (DoE) software. The effects of various variables such as pH, initial persulfate concentration, and initial Catechol concentration were investigated. The findings indicated with increases in persulfate concentration and decrease in catechol concentrations, the removal efficiency increased. Acidic pH and UV radiation were the leading factors in removal of catechol. The optimum pH, persulfate concentration, and catechol concentration were obtained 7, 0.04 M, and 100 mg l-1, respectively. More removes of catechol was achieved in optimum conditions within contact time of 60 min. The synergic effects of UV and persulfate radical were about 88%. Approximately 60% of catechol was mineralized within contact time of 60 min. Persulfate radicals resulting from UV/S2O82- were the main effective oxidants in removal and mineralization of catechol. Owing to high removal efficiency of persulfate compounds which are, also, abundant and inexpensive, these can be applied in removal of persistent organic pollutants from aqueous solutions.</p>

scholarly journals Uptake of Pb(II) Ions from Simulated Aqueous Solution via Nanochitosan

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 862 ◽  
Author(s):  
Camellia Zareie ◽  
Saeideh Kholghi Eshkalak ◽  
Ghasem Najafpour Darzi ◽  
Mazyar Sharifzadeh Baei ◽  
Habibollah Younesi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Sorption Process ◽  
Absorption Capacity ◽  
Absorption Data ◽  
Force Microscopy ◽  
Atomic Force ◽  
Low Molecular Weight Chitosan ◽  
Pseudo Second Order ◽  
Sorption Parameters

In this work, nanochitosan (NC) was prepared through ionic gelation using low molecular weight chitosan and maleic acid (MA). The synthesized NC was characterized by atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). During preparation, the particle size of the material depended on parameters such as concentration of chitosan and pH of the aqueous solution. After controlling the mentioned parameters, NC smaller than 100 nm was prepared. The chitosan and prepared NC were employed for the adsorption of Pb(II) from an aqueous solution in the form of a batch system. Among the sorption parameters, pH showed the strongest effect on the sorption process and removal of the maximum number of Pb(II) ions was obtained at pH value of 6. Pseudo-first-order and pseudo-second-order models were used to track the kinetics of the adsorption process. Langmuir and Freundlich’s isotherms were subjected to the absorption data to evaluate absorption capacity. NC proved to be an excellent adsorbent with a remarkable capacity to eliminate Pb(II) ions from aqueous solutions at multiple concentrations. The NC also showed better performance with a comparatively easier preparation process than in other reported work.

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