scholarly journals Removal of Copper(II) Ions from Aqueous Solutions. I. Adsorption Studies Using Powdered Marble Wastes as Sorbent

2003 ◽  
Vol 21 (3) ◽  
pp. 285-296 ◽  
Author(s):  
S.E. Ghazy ◽  
S.E. Samra ◽  
A.M. Mahdy ◽  
S.M. El-Morsy
Keyword(s):  
Aqueous Solutions ◽  
Environmental Problem ◽  
Sorption Process ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Adsorption Models ◽  
First Order ◽  
Inorganic Sorbent ◽  
First Order Kinetics

Batch adsorption experiments of copper(II) ions from aqueous solutions on to powdered marble wastes (PMW) have been performed. The latter is an effective inorganic sorbent which is inexpensive, widespread and may represent an environmental problem. The main parameters influencing the sorption process, i.e. initial solution pH, sorbent and Cu2+ ion concentrations, stirring times and temperature, were examined. The results obtained revealed that the sorption of Cu2+ ions on to PMW was endothermic in nature and followed first-order kinetics. Moreover, it was well described by the Langmuir, Freundlich and Dubinin–Radushkevich (D–R) adsorption models over the concentration range studied. Under the optimum experimental conditions employed, the removal of ca. 100% Cu2+ ions was attained.

scholarly journals Adsorption of Pollutants from Aqueous Solutions Using Activated and Non-Activated Oak Shells: Parametric and Fractional Factorial Design Study. Part II. Removal of Phenol and Dyes

2003 ◽  
Vol 21 (2) ◽  
pp. 189-198
Author(s):  
Sameer Al-Asheh ◽  
Fawzi Banat ◽  
Rana Saeidi ◽  
Salam Abu Zaid
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Factorial Design ◽  
Fractional Factorial Design ◽  
Sorption Process ◽  
Fractional Factorial ◽  
Phenol Concentration ◽  
Blue Dye ◽  
Batch Adsorption ◽  
Solution Ph

As in Part I, non-activated (natural) and chemically activated oak shells were evaluated for their ability to remove phenol and Methylene Blue (as a typical dye component) from aqueous solutions. Batch adsorption experiments were conducted to investigate the effect of contact time, sorbent concentration, phenol concentration and the pH of the solution on the sorption process. Activated oak shells adsorbed more phenol than natural oak shells under the same conditions. A decrease in sorbent concentration or an increase in phenol concentration or solution pH resulted in an increase in phenol uptake by the oak shells. The uptake of Methylene Blue increased with decreasing sorbent concentration and with an increase in the dye concentration, but decreased significantly with solution pH. According to the fractional factorial design technique, the sorbent type employed (natural or activated) had the most significant influence on phenol or Methylene Blue uptake followed by sorbent concentration and then sorbate concentration. Interaction amongst the different operating variables played an important role in the uptake of phenol or Methylene Blue dye by the adsorbent considered.

scholarly journals Examination of the Effectiveness of Physical and Chemical Activation of Natural Bentonite for the Removal of Heavy Metal Ions from Aqueous Solutions

2002 ◽  
Vol 20 (2) ◽  
pp. 151-167 ◽  
Author(s):  
Fawzi Banat ◽  
Sameer Al-Asheh ◽  
Leena Abu-Aitah
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Chemical Activation ◽  
Sodium Dodecyl ◽  
Batch Adsorption ◽  
Initial Material ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Activated Bentonite

The ability of physically and chemically activated bentonite to adsorb copper and nickel ions from aqueous solutions was examined under various experimental conditions. Physically activated bentonite was obtained by thermal treatment of the initial material in an oven at 700°C (T-bentonite), while chemically activated bentonite was obtained in two ways, either by treatment of the initial material with sodium dodecyl sulphate (SDS) as an anionic surfactant to give SDS-bentonite or with aluminium hydroxypolycation as a pillaring agent to give Al-bentonite. Batch adsorption tests were undertaken to study the removal of Cu2+ and Ni2+ ions from aqueous solutions using the above-mentioned types of activated bentonite. The adsorption capacity of the bentonites towards both Cu2+ and Ni2+ ions followed the order: Al-bentonite > SDS-bentonite > T-bentonite > natural bentonite. The initial metal concentration, solution pH, temperature and salinity of the solution affected the adsorption capacity towards both metal ions. The uptake of Cu2+ ions increased with an increase in temperature (25–45°C) as well as with an increase in the initial pH of the solution (3–5). The uptake of Cu2+ and Ni2+ ions decreased significantly with an increase in the NaCl and KCl concentrations present in the aqueous solution. Sulphuric acid of 0.1 M concentration was found to be an effective desorbent for bentonite laden with heavy metals.

scholarly journals Adsorption of Pb2+ ions from aqueous solutions by gelatin/activated carbon composite bead form

2017 ◽  
Vol 36 (1-2) ◽  
pp. 355-371 ◽  
Author(s):  
Fareeda Hayeeye ◽  
Qiming J Yu ◽  
Memoon Sattar ◽  
Watchanida Chinpa ◽  
Orawan Sirichote
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Carbon Composite ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Composite Bead

Gelatin and activated carbon materials have been combined together to obtain a gelatin/activated carbon composite bead form which is ecofriendly, nontoxic, biocompatible, and inexpensive material. In this paper, gelatin/activated carbon adsorption for Pb2+ ions from aqueous solutions was studied experimentally under various conditions. The experimental conditions such as contact time, solution pH, and gelatin/activated carbon dosage were examined and evaluated by using batch adsorption experiments. The maximum adsorption capacity of gelatin/activated carbon for Pb2+ ions was obtained to be 370.37 mg g−1. This maximum capacity was comparable with that of commercial ion exchange resins and it was much higher than those of natural zeolites. The uptake process for Pb2+ ions was found to be relatively fast with 92.15% of the adsorption completed in about 5 min in batch conditions. The adsorption capacity was also strongly solution pH dependent. Adsorption was observed at pH value as low as 2.0 and maximum adsorption was achieved at a pH of approximately 5. The results indicated that the gelatin/activated carbon was effective to be used as an adsorbent for Pb2+ ions removal in wastewater treatment.

Kinetic of oxidation of methyl orange by vanadium(V) under conditions VO2+ and decavanadates coexist: Catalysis by Triton X-100 micellar medium

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Methyl Orange ◽  
Solution Ph ◽  
Vanadium Concentration ◽  
Limiting Behavior ◽  
First Order ◽  
First Order Kinetics ◽  
Ph Range ◽  
Kinetic Pattern ◽  
Triton X ◽  
Kinetics Of

The kinetics of oxidation of methyl orange by vanadium(V) {V(V)} has been investigated in the pH range 2.3-3.79. In this pH range V(V) exists both in the form of decavanadates and VO2+. The kinetic results are distinctly different from the results obtained for the same reaction in highly acidic solution (pH < 1) where V(V) exists only in the form of VO2+. The reaction obeys first order kinetics with respect to methyl orange but the rate has very little dependence on total vanadium concentration. The reaction is accelerated by H+ ion but the dependence of rate on [H+] is less than that corresponding to first order dependence. The equilibrium between decavanadates and VO2+ explains the different kinetic pattern observed in this pH range. The reaction is markedly accelerated by Triton X-100 micelles. The rate-[surfactant] profile shows a limiting behavior indicative of a unimolecular pathway in the micellar pseudophase.

Decomposition of 4,4'-(Diazoamino)-bis(5-methoxy-2-methylbenezenesulfonic Acid) in Solutions ofFD&C Red No. 40

1984 ◽  
Vol 67 (4) ◽  
pp. 844-845
Author(s):  
Naomi Richfield-Fratz
Keyword(s):  
Liquid Chromatography ◽  
Aqueous Solutions ◽  
Borate Buffer ◽  
Sodium Borate ◽  
First Order ◽  
First Order Kinetics ◽  
Color Additive ◽  
Sodium Borate Buffer

Abstract 4,4'-(Diazoamino)-bis(5-methoxy-2-methylbenzenesuIfonic acid), when present as a reaction by-product in FD&C Red No. 40, is shown to decompose rapidly in aqueous solutions of the color additive. The decomposition is halted by the addition of sodium borate buffer. Quantitationly liquid chromatography shows that decomposition is nonlinear with time and follows approximate first order kinetics.

scholarly journals Nanosized centers for mercury(II) ions adsorption on a surface of modified silica

2008 ◽  
Vol 6 (4) ◽  
pp. 581-591 ◽  
Author(s):  
Lyudmila Belyakova ◽  
Oleksandra Shvets ◽  
Diana Lyashenko
Keyword(s):  
Aqueous Medium ◽  
Batch Adsorption ◽  
Modified Silica ◽  
First Order ◽  
Chemically Modified ◽  
First Order Kinetics ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Second Order Equations

AbstractThe present work investigates the adsorptive interactions of Hg(II) ions in aqueous medium with hydroxylated silica, aminopropylsilica and silica chemically modified by β-cyclodextrin. Batch adsorption studies were carried out with various agitation times and mercury(II) concentrations. The maximum adsorption was observed within 15–30 min of agitation. The kinetics of the interactions, tested with the model of Lagergren for pseudo-first and pseudo-second order equations, showed better agreement with first order kinetics (k1 = 3.4 ± 0.2 to 5.9 ± 0.3 min−1). The adsorption data gave good fits with Langmuir isotherms. The results have shown that β-cyclodextrin-containing adsorbent has the largest adsorption specificity to Hg(II): K L = 4125 ± 205 mmol−1. “β-cyclodextrin-NO3-” inclusion complexes with ratio 1: 1 and super molecules with composition C42H70O35 ⊎ 3 Hg(NO3)2 are formed on the surface of β-cyclodextrin-containing silica.

scholarly journals Adsorption of Pollutants from Aqueous Solutions Using Activated and Non-Activated Oak Shells: Parametric and Fractional Factorial Design Study. Part I. Removal of Copper

2003 ◽  
Vol 21 (2) ◽  
pp. 177-188 ◽  
Author(s):  
Sameer Al-Asheh ◽  
Fawzi Banat ◽  
Nagham Al-Hamed
Keyword(s):  
Aqueous Solutions ◽  
Factorial Design ◽  
Contact Time ◽  
Fractional Factorial Design ◽  
Ion Uptake ◽  
Fractional Factorial ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Operating Variables

Non-activated and chemically activated oak shells were evaluated for their ability to remove Cu2+ ions from aqueous solutions. Batch adsorption experiments were conducted to investigate the effect of contact time, sorbent concentration, Cu2+ ion concentration and the pH of the solution on the sorption process. The Cu2+ ion uptake by oak shells increased with decreasing sorbent concentration or with an increase in Cu2+ ion concentration or solution pH. The fractional factorial design technique was applied in order to determine the average Cu2+ ion uptake, the contribution of each operating variable to the value of the uptake and the interaction among the operating variables when the sorbent type, sorbent concentration, Cu2+ ion concentration, pH, contact time and salt were all varied from one level to another. Application of this technique showed that the sorbent concentration had the largest influence on the value of the Cu2+ ion uptake followed by Cu2+ ion concentration and sorbent type. Interaction among the different operating variables played an important role in the adsorption process.

Thermal Degradation of Green Asparagus Texture

1997 ◽  
Vol 60 (3) ◽  
pp. 315-320 ◽  
Author(s):  
CARMEN RODRIGO ◽  
MIGUEL RODRIGO ◽  
SUSANA FISZMAN ◽  
TERESA SÁNCHEZ
Keyword(s):  
Single Point ◽  
Experimental Conditions ◽  
Cutting Resistance ◽  
First Order ◽  
First Order Kinetics ◽  
Press Method ◽  
The Wire ◽  
Shear Press ◽  
Kinetics Of ◽  
Green Asparagus

A cutting cell was developed to evaluate the texture of green asparagus by measuring its resistance to being cut with a wire. The cell was used in conjunction with a universal texturometer and improved on the single-point method of the Wilder fibrometer. Experimental conditions were determined for using the cell to measure the cutting resistance of asparagus subjected to different extents of heat treatment. Better discrimination between samples was obtained than with a Kramer cell. The fresh asparagus spears. were heated at temperatures between 70 and 100°C for different lengths of time and the kinetics of the degradation of texture was studied. A biphasic (two-component) behavior was observed with each component displaying first-order kinetics, The kinetic parameters calculated by measuring the texture with the wire cell (cutting at a position 5 em from the tip of the asparagus) were Eaa = 9.56 and Eab = 20.43 kcal/mol (activation energy for components A and B), and ka85 = 1.047 and kb85 = 0.057 min−1 (rate constants for A and B of asparagus heated at 85°C). When the texture was determined by measuring the shear force with a Kramer cell, the parameters estimated were Eaa = 23.41 and Eab = 18.32 kcal/mol, and ka85 = 0.25 and kb85 = 0.025 min−1 Both the wire cell cutting method and the Kramer shear-press method are suitable for evaluating the degree of thermal softening of green asparagus heated to temperatures between 70 and 100°C.

Über die Abnahme von Elektronenzentren in 60Co-γ-bestrahltem polykristallinem NaCl bei Adsorption von Gasen

1969 ◽  
Vol 24 (5) ◽  
pp. 796-802 ◽  
Author(s):  
J. R. Rabe ◽  
G. Joppien
Keyword(s):  
Sodium Chloride ◽  
Ionizing Radiation ◽  
Nitrogen Molecule ◽  
Color Centers ◽  
Experimental Conditions ◽  
Adsorbed Molecules ◽  
First Order ◽  
First Order Kinetics ◽  
Adsorption Of Gases

Abstract Ionizing radiation generates color centers in sodium chloride. On adsorption of gases on preir-radiated salt the concentration of electron centers decreases. Adsorbed azoethane partly decomposes forming nitrogen. About one to five electron centers disappear per nitrogen molecule formed depending on experimental conditions (temperature, amount of azoethane adsorbed and pretreatment of the salt). Electron centers disappear and nitrogen is formed with identical rates following first order kinetics. It is suggested that adsorbed molecules interacting with the surface cause electrons or holes to escape from their traps and eventually to recombine.

scholarly journals Adsorption of Pb2+, Cu2+ and Zn2+ Ions on to Waste Fluidized Catalytic Cracking (FCC) Catalyst

1998 ◽  
Vol 16 (8) ◽  
pp. 595-606 ◽  
Author(s):  
Tang Yubin ◽  
Chen Fangyan ◽  
Zhang Honglin
Keyword(s):  
Catalytic Cracking ◽  
Packed Bed ◽  
Batch Adsorption ◽  
Metallic Ions ◽  
Experimental Conditions ◽  
Adsorption Models ◽  
Fcc Catalyst ◽  
Fluidized Catalytic Cracking ◽  
Adsorption Data ◽  
Exchange Adsorption

Batch adsorption experiments of Pb2+ Cu2+ and Zn2+ ions on to waste fluidized catalytic cracking (FCC) catalyst were performed. The results obtained indicate that adsorption time, temperature and pH were the main factors influencing the adsorptive capacities. The adsorption data for each ion were well described by the Freundlich and Langmuir adsorption models. The mechanisms for the adsorption of Pb2+, Cu2+ and Zn2+ ions on to waste FCC catalyst involved ion-exchange adsorption of the three kinds of heavy metallic ions studied or the formation of hydroxo complexes. Under the experimental conditions employed, the removal of Pb2+, Cu2+ and Zn2+ ions attained values of 97.0%, 90.5% and 91.5%. respectively. In addition, dynamic adsorption of the respective ions on to a column of FCC catalyst was investigated together with studies of the regeneration of the adsorbent. The results of such column tests showed that Pb2+ ions can be effectively removed from aqueous solutions by waste FCC catalyst in a packed bed. The adsorbent was easily regenerated by the use of a flow of hydrochloric acid through the packed bed under the experimental conditions employed.

Sign in / Sign up

Export Citation Format

Share Document