scholarly journals INVESTIGATION OF THE THERMODYNAMIC CHARACTERISTICS OF THE EXTRACTION OF COPPER IONS FROM AQUEOUS SOLUTIONS USING ACTIVATED CARBON

2021 ◽  
pp. 68-73
Author(s):  
И.К. Гиндулин ◽  
В.В. Юрченко
Keyword(s):  
Adsorption Process ◽  
Activated Carbons ◽  
Copper Ions ◽  
Thermodynamic Characteristics ◽  
Optimal Level ◽  
Nanoporous Materials ◽  
Carbon Adsorbents ◽  
Kinetic Characteristics ◽  
Copper Adsorption ◽  
Adsorption Activity

Изучение термодинамических и кинетических характеристик позволяет более эффек- тивно использовать углеродные адсорбенты в технологических процессах, чем поддерживается тех- нология их использования на оптимальном уровне. В работе изучалась адсорбционная активность углеродных нанопористых материалов, рассчитывались кинетические характеристики процесса ад- сорбции, термодинамические характеристики (энергия Гиббса, энтальпия, константа адсорбции) адсорбции ионов меди на активных углях, полученных на установках (модульная пиролизная реторт- ная установка) и УВП (углевыжигательная печь). Установлено, что процесс идёт самопроизвольно, характер адсорбционного взаимодействия экзотермический. Адсорбционные равновесие достигается меньше чем за 15 мин. The study of thermodynamic and kinetic characteristics allows more efficient use of carbon adsorbents in technological processes. Thus, keeping their use at an optimal level. The adsorption activity of carbon nanoporous materials was studied, the kinetic characteristics of the adsorption process, thermodynamic characteristics (Gibbs energy, enthalpy, adsorption constant) of copper adsorption on activated carbons obtained at MPRP and CK installations were calculated in this work. It was found that the process is spontaneous (G <0). The nature of the adsorption behavior is exothermic. Adsorption equilibrium is achieved in less than 15 minutes.

scholarly journals Adsorption of 1,2-Dichlorobenzene from the Aqueous Phase onto Activated Carbons and Modified Carbon Nanotubes

2021 ◽  
Vol 22 (23) ◽  
pp. 13152
Author(s):  
Martyna Jurkiewicz ◽  
Robert Pełech
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Phase ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Internal Standard ◽  
Carbon Adsorbents ◽  
Hydroxyl Groups ◽  
Flame Ionization Detection ◽  
Flame Ionization ◽  
Modified Carbon Nanotubes

This study aimed to describe the adsorption process of ortho-dichlorobenzene (o-DCB) onto activated carbons (ACs) and modified carbon nanotubes (CNTs) from the aqueous phase. The starting material NC_7000 carbon nanotubes were modified by chlorination (NC_C) and then by the introduction of hydroxyl groups (NC_C_B). The concentration of o-DCB in solutions was performed by UV-VIS spectrophotometry. After adsorption, the activated carbons were regenerated by extraction with organic solvents such as acetone, methanol, ethanol, and 1-propanol; the carbon nanotubes were regenerated by methanol. The degree of adsorbate recovery was determined by gas chromatography (GC) with flame ionization detection, using ethylbenzene as an internal standard. The equilibrium isotherm data of adsorption were satisfactorily fitted by the Langmuir equations. The results indicate that carbon adsorbents are effective porous materials for removing o-DCB from the aqueous phase. Additionally, activated carbons are more regenerative adsorbents than carbon nanotubes. The recoveries of o-DCB from ACs were in the range of 76–85%, whereas the recoveries from CNTs were in the range of 23–46%. Modifications of CNTs affect the improvement of their adsorption properties towards o-DCB compared to unmodified CNTs. However, the introduction of new functional groups on carbon nanotube surfaces makes the regeneration process less effective.

scholarly journals Carnauba straw powder treated with bentonite for copper adsorption in aqueous solution: isothermal, kinetic and thermodynamic study

2020 ◽  
Vol 82 (10) ◽  
pp. 2178-2192
Author(s):  
Jéssyca E. S. Pereira ◽  
Alfredo J. F. Silva ◽  
Paula F. P. Nascimento ◽  
Ruan L. S. Ferreira ◽  
Eduardo L. Barros Neto
Keyword(s):  
Adsorption Process ◽  
Copper Ions ◽  
Order Model ◽  
Copper Adsorption ◽  
Synthetic Solution ◽  
Pseudo Second Order ◽  
Isothermal Kinetic ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Kinetic And Thermodynamic Study

Abstract In this work, the natural and modified carnauba powder from the addition of bentonite was evaluated for the adsorption of Cu(II) ions in synthetic solution. The results showed that the carnauba powder treated with bentonite (CPTB) showed a better percentage of removal of Cu(II) ions when compared to natural carnauba powder (NCP). The best results for both adsorbents were obtained with pH 5. The adsorption kinetics was governed by the pseudo-second-order model for both bioadsorbents studied. While the isothermal behavior was governed by the Langmuir model and showed that the adsorption capacity of the CPTB for Cu(II) was 21.98 mg·g−1. The interaction of the metal and CPTB was also investigated by means of thermodynamic parameters showing that the adsorption process is not spontaneous, although the values of ΔG° decrease with the increase in temperature from 20 to 40 °C and endothermic causing an increase in the degree of disorder at the solid/liquid interface. The results showed that the CPTB is a material with potential adsorbent for the removal of copper ions.

scholarly journals A chitosan fiber as green material for removing Cr(VI) ions and Cu(II) ions pollutants

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shujie Zhang ◽  
Yating Zhang ◽  
Lisong Fu ◽  
Mengke Jing
Keyword(s):  
Metal Ions ◽  
Adsorption Process ◽  
Ph Value ◽  
Copper Ions ◽  
Physical Adsorption ◽  
Thermodynamic Characteristics ◽  
Fiber Material ◽  
Thermal Reaction ◽  
Order Kinetic ◽  
Chromium Ions

AbstractThe application shell uses cellulose as a green and recyclable fiber material, which has great value in the field of water treatment environment. Varying factors, including pH value, dosage of CS, reaction time and original Cr(VI) ions and Cu(II) ions were studied to investigate the Cr(VI) and Cu(II) ions removal efficiency. The obtained shell trichlorocellulose has better permeability to copper ions, which is mainly due to the different oxide states of copper ions and chromium ions in a pH environment, which lead to different combinations. The price of shell cellulose neutralization is relatively low. Metal ions have better absorption properties. The kinetic and thermodynamic characteristics of the adsorption process of copper ions by chitosan yarns were discussed. The adsorption process of copper ions conformed to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption of copper ions by the yarn is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. Compared with chromium ions, chitosan fibers have better adsorption of copper ions, which is mainly because the amino groups in chitosan fibers can have good chelation with copper ions. SEM, FTIR, XRD were used to characterize the adsorption of copper ions by chitosan fibers, and the mechanism of the adsorption of metal ions by chitosan fibers was explored.

scholarly journals Carbon Adsorbents from Spent Coffee for Removal of Methylene Blue and Methyl Orange from Water

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3996
Author(s):  
Inga Block ◽  
Christina Günter ◽  
Alysson Duarte Rodrigues ◽  
Silvia Paasch ◽  
Peter Hesemann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Methyl Orange ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Waste Product ◽  
Dye Adsorption ◽  
Aqueous Sodium Hydroxide ◽  
Carbon Adsorbents ◽  
Aqueous Sodium

Activated carbons (ACs) were prepared from dried spent coffee (SCD), a biological waste product, to produce adsorbents for methylene blue (MB) and methyl orange (MO) from aqueous solution. Pre-pyrolysis activation of SCD was achieved via treatment of the SCD with aqueous sodium hydroxide solutions at 90 °C. Pyrolysis of the pretreated SCD at 500 °C for 1 h produced powders with typical characteristics of AC suitable and effective for dye adsorption. As an alternative to the rather harsh base treatment, calcium carbonate powder, a very common and abundant resource, was also studied as an activator. Mixtures of SCD and CaCO3 (1:1 w/w) yielded effective ACs for MO and MB removal upon pyrolysis needing only small amounts of AC to clear the solutions. A selectivity of the adsorption process toward anionic (MO) or cationic (MB) dyes was not observed.

scholarly journals Factors Affecting Efficiency of Biosorption of Fe (III) and Zn (II) by Ulva lactuca and Corallina officinalis and Their Activated Carbons

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3421
Author(s):  
Mahy M. Ameen ◽  
Abdelraouf A. Moustafa ◽  
Jelan Mofeed ◽  
Mustapha Hasnaoui ◽  
Oladokun Sulaiman Olanrewaju ◽  
...  
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Algal Biomass ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Thermodynamic Characteristics ◽  
Ulva Lactuca ◽  
Isotherm Models ◽  
Green Algal ◽  
Corallina Officinalis

The removal of heavy metals from industrial waste has become crucial in order to maintain water quality levels that are suitable for environmental and species reproductive health. The biosorption of Zn+2 and Fe+3 ions from aqueous solution was investigated using Ulva lactuca green algal biomass and Corallina officinalis red algal biomass, as well as their activated carbons. The effects of biosorbent dosage, pH, contact time, initial metal concentration, and temperature on biosorption were evaluated. The maximum monolayer capacity of Ulva lactuca and Corallina officinalis dry algal powder and algal activated carbon was reached at pH 5 and 3 for Zn+2 and Fe+3, respectively, while the other factors were similar for both algae, which were: contact time 120 min, adsorbent dose 1 g, temperature 40 °C and initial concentrations of metal ion 50 mg·L−1. The batch experimental data can be modelled using the Langmuir and Freundlich isotherm models. Thermodynamic characteristics revealed that the adsorption process occurs naturally and is endothermic and spontaneous. For the adsorption of Zn+2 and Fe+3 ions, the value of G° was found to be negative, confirming the practicality of the spontaneous adsorption process, which could be helpful for remediation in the era of temperature increases.

STUDY OF THE ADSORPTION ACTIVITY OF THE BIOFILMS OF THE IRONAND MANGANESE-OXIDIZING BACTERIA IN RELATING TO COPPER IONS CU2+ AND LEAD PB2+

2020 ◽  
Vol 21 (2) ◽  
pp. 73-76
Author(s):  
V.S. SHIMANOVA ◽  
◽  
L.V. LEONOVA ◽  
I.A. BULATOV ◽  
I.V. ANANINA ◽  
...  
Keyword(s):  
Copper Ions ◽  
Adsorption Activity

scholarly journals Fly Ash Coated with Magnetic Materials: Improved Adsorbent for Cu (II) Removal from Wastewater

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 63
Author(s):  
Maria Harja ◽  
Gabriela Buema ◽  
Nicoleta Lupu ◽  
Horia Chiriac ◽  
Dumitru Daniel Herea ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Synthetic Wastewater ◽  
Bet Surface Area ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Copper Adsorption ◽  
X Ray

Fly ash/magnetite material was used for the adsorption of copper ions from synthetic wastewater. The obtained material was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area, and vibrating sample magnetometer (VSM). Batch adsorption experiments were employed in order to investigate the effects of adsorbent dose, initial Cu (II) concentration and contact time over adsorption efficiency. The experimental isotherms were modeled using Langmuir (four types of its linearization), Freundlich, Temkin, and Harkins–Jura isotherm models. The fits of the results are estimated according to the Langmuir isotherm, with a maximum adsorption capacity of 17.39 mg/g. The pseudo-second-order model was able to describe kinetic results. The data obtained throughout the study prove that this novel material represents a potential low-cost adsorbent for copper adsorption with improved adsorption capacity and magnetic separation capability compared with raw fly ash.

scholarly journals Evaluation of Porous Carbon Adsorbents Made from Rice Husks for Virus Removal in Water

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1280
Author(s):  
Vu Duc Canh ◽  
Seiichiro Tabata ◽  
Shun Yamanoi ◽  
Yoichi Onaka ◽  
Toshiyuki Yokoi ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Activated Carbons ◽  
Carbon Adsorbents ◽  
Rice Husks ◽  
Porous Carbons ◽  
Inorganic Pollutants ◽  
Steam Activation ◽  
Virus Removal ◽  
Silica Removal ◽  
Effective Removal

Porous carbons are well-known efficient adsorbents for a variety of organic and inorganic pollutants; however, they have difficulty in virus removal. In this study, novel porous carbons (NPCs) (NPC-A, NPC-B, and NPC-C) derived from rice husks were compared with commercially available activated carbons (ACs) for their ability to remove MS2 bacteriophages (MS2) in a batch experiment. NPC-A was produced by the silica removal process. NPC-B was prepared with an additional steam activation applied to NPC-A. NPC-C was obtained with an additional acid rinse applied to NPC-B. The NPCs (particularly NPC-C) exhibited effective removal of up to 5.3 log10 of MS2, which was greater than that of less than 2.7 log10 obtained by other ACs under 10 g/L during the same contact time (60 min). The pore size distribution of the porous carbon adsorbents was found to influence their virus removal performance. The adsorbents with a larger proportion of pores ranging from 200–4500 nm in diameter were able to achieve higher virus removal rates. Thus, NPCs (particularly NPC-C), which had a larger volume of pores ranging from 200–4500 nm in size, demonstrated the potential for use as efficient adsorbents for removing viruses during water purification.

Methods of Obtaining and Physicochemical Properties of Modified Carbonaceous Sorbents

2021 ◽  
Vol 1045 ◽  
pp. 117-126
Author(s):  
Olena Svietkina ◽  
Olga Netiaga ◽  
Hanna Tarasova ◽  
Ievgenii Ustymenko ◽  
Edgar Caseres Cabana
Keyword(s):  
Physicochemical Properties ◽  
Porous Structure ◽  
Radiation Resistance ◽  
Adsorption Process ◽  
Chemical Nature ◽  
Carbon Adsorbents ◽  
Electrophysical Properties ◽  
Active Carbons ◽  
Carbonaceous Sorbents ◽  
Peculiar Nature

The variety of practical problems solved in recent years with the help of sorption methods requires expanding the range of used adsorbents. Active carbons are very promising porous adsorbents. Due to a whole complex of valuable properties of a highly developed porous structure, a variety of the chemical nature of the surface, special electrophysical properties, as well as chemical, thermal and radiation resistance, various active carbons are widely used for the absorption of gaseous and dissolved substances. The peculiar nature of carbon adsorbents contributes to the fact that solutes on coal can be adsorbed by completely different; mechanisms, their sorption may be due to the different nature of the forces involved in the adsorption process. The purpose of the work is to obtain multipurpose sorbents; to study methods of modification of carbonaceous sorbents from ash waste, as well as their physicochemical properties

Experimental Study on Adsorption of Gasoline Vapor on Activated Carbon at High Concentration

2013 ◽  
Vol 807-809 ◽  
pp. 549-552 ◽  
Author(s):  
Chen Lu Zhao ◽  
Wei Qiu Huang ◽  
Ying Xia Wang ◽  
Li Shi
Keyword(s):  
Temperature Rise ◽  
Activated Carbons ◽  
Thermodynamic Characteristics ◽  
High Concentration ◽  
Vapor Adsorption ◽  
Gasoline Vapor ◽  
Adsorption Capacities ◽  
Bed Temperature ◽  
Relationship Of ◽  
The Relationship

Dynamic and thermodynamic characteristics of gasoline vapor adsorption at 0.3 mol/mol on different activated carbons (ACs) were investigated. The adsorption capacities of AC1 and AC3 were 0.295 g/g and 0.189 g/g at 20 oC, and 0.284 g/g and 0.165 g/g at 30 °C, respectively. Bed temperature rise was up to 50°C to 60°C in the adsorption of gasoline vapor at 0.3 mol/mol.The heat effect formula for high concentration vapor adsorption was deduced to evaluate the relationship of the adsorption capacity of the activated carbons, the mole fraction of the inlet gasoline vapor, the recovery efficiency of the gasoline vapor with the temperature rise.

Sign in / Sign up

Export Citation Format

Share Document