Features of adsorption processes for wastewater treatment from zinc ions

2021 ◽  
Vol 6 (2) ◽  
pp. 64-68
Author(s):  
Ihor Petrushka ◽  
◽  
Oksana Bratus ◽  
Kateryna Petrushka ◽  
◽  
...  
Keyword(s):  
Sorption Process ◽  
Adsorption Properties ◽  
Zinc Ions ◽  
Optimal Conditions ◽  
Solid Complex ◽  
Monomolecular Layer ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Adsorption Processes ◽  
Langmuir And Freundlich Models

The results of adsorption properties of complex natural sorbents in relation to the neutralization of zinc ions from wastewater are presented. The adsorption isotherm of Zn2+ ions on complex sorbents (clinoptilolite-shungite) (1:1) according to Langmuir and Freundlich models is constructed, the type of adsorption isotherms according to S. Brunauer classification is established. The value of the maximum sorption capacity of Gmax complex sorbents for Zn2+ ions is calculated. The peculiarities of the sorption process of zinc ions with the formation of a monomolecular layer based on the calculated coefficients of the Langmuir and Freundlich were found. The optimal conditions for the dependence of the degree of absorption of Zn2+ ions by complex sorbents on the duration of the sorption process are determined. The ratio "solid (complex sorbent) - liquid" was determined experimentally.

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.

scholarly journals Sorption of vanadium (V) and nickel (II) on amorphous silic

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 253-260
Author(s):  
O. A. Timoshchik ◽  
◽  
E. A. Shchelokova ◽  
A. G. Kasikov ◽  
M. V. Bryukhanova ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Amorphous Silica ◽  
Sorption Process ◽  
Process Time ◽  
Optimal Conditions ◽  
Metal Sorption ◽  
Maximum Sorption ◽  
Metallurgical Slags

The sorption of vanadium (V) and nickel (II) from aqueous solutions on amorphous silica obtained from metallurgical slags of the Kola MMC is considered, and the optimal conditions for the metal sorption process are determined. It is established that the maximum sorption of metals is achieved at pH 2.0–4.0, at a temperature of 40 °C and a process time of 60 minutes for nickel and 90 minutes for vanadium.

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.

Technology of Obtaining Sorbents Based on Metal Dust and Carbonized Biopolymers for Purification of Surface and Waste Water From Oil and Oil Products

2020 ◽  
Vol 24 (3) ◽  
pp. 24-28
Author(s):  
L.N. Olshanskaya ◽  
M.A. Chernova ◽  
O.A. Aref'eva ◽  
E.M. Bakanova ◽  
E.V. Yakovleva ◽  
...  
Keyword(s):  
Waste Water ◽  
Sorption Process ◽  
Product Layer ◽  
Contaminated Water ◽  
Sorption Equilibrium ◽  
Gas Treatment ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Metal Dust ◽  
Oil And Oil Products

The results on the production of composite magnetosorbents (CMS) based on agricultural wastes (uncontaminated steel gas treatment dust – PGSN, sunflower husk, paraffin) for the treatment of contaminated water from oil and its products and minimizing the environmental impact of petrochemical enterprises are presented. Biotesting at two test sites (crustaceans Daphnia magna and algae Scenedesmus quadricauda) allowed us to establish that PSGN is non-toxic and can be used as a component of magnetosorbents. The resulting materials showed good physicochemical properties. It was shown that CMC have high hydrophobicity – the contact angle of contact was 125–137 degrees; buoyancy of the material for 96 hours did not decrease below 97–99 %; CMC had a low water absorption of 0.132–0.114 g/g. The oil intensity of the sorbents was 6.0 ± 0.15 g/g. Sorption equilibrium was achieved during the first 10–20 minutes contact of the material with oil and oil productsand remained constant. It has been established that the sorption process is influenced by the nature and thickness of the oil product layer. The maximum sorption capacity is achieved with a film thickness of 3.5 ± 0.15 mm.

Two-pot oxidative preparation of dicarboxylic acid containing cellulose for the removal of Beryllium (Be2+) from aqueous solution.

2020 ◽  
Vol 16 ◽  
Author(s):  
Vedat Tolga Özdemir ◽  
Himmet Mert Tuğaç ◽  
Özgür Arar
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Initial Step ◽  
Sorption Process ◽  
Hydroxyl Groups ◽  
Solution Ph ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Aldehyde Groups ◽  
Kinetics Of

Background: Cellulose is one of the most abundant, non-toxic, and renewable natural biopolymers. The presence of hydroxyl groups in cellulose leads to further modification of it. Preparation and modification of cellulose-based sorbents and their applications on water treatment gained traction in recent years. Objective: A low-cost and eco-friendly biosorbent was designed and fabricated by introducing the acetate functional groups into cellulose for removing Beryllium (Be2+) from an aqueous solution. The so rption of Be2+ on acetate containing cellulose was evaluated for varying sorbent doses and initial solution pH values. Method: The sorbent was prepared by a two-step oxidation process. In the initial step, cellulose reacted with NaIO4 and aldehyde groups were introduced to cellulose. In the second step, newly obtained aldehyde groups were oxidized to create acetate groups. Results: The kinetics of the sorption process showed that Be2+ uptake reached equilibrium in 3 minutes. The sorption isotherm was well fitted in the Langmuir model, and maximum sorption capacity was 4.54 mg/g. Moreover, the thermodynamic studies demonstrated that Be2+ sorption is spontaneous and exothermic. Furthermore, the prepared sorbent can be regenerated by using 0.1 M HCl or H2SO4 solutions. Conclusion: Removal of Be2+ is pH dependent and it is favorable at high solution pH. The kinetics of the prepared sorbent is rapid and equilibrium attained in 3 minutes. The prepared sorbent can be regenerated with 0.1 M acid solution with > 99% efficiency.

Kinetics and adsorption equilibrium of some radionuclides on polyaniline/SiO2 composite

2021 ◽  
Vol 109 (2) ◽  
pp. 85-97
Author(s):  
Abeer E. Kasem ◽  
Ezzat A. Abdel-Galil ◽  
Nabil Belacy ◽  
Nagwa A. Badawy
Keyword(s):  
Adsorption Equilibrium ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Sorption Behavior ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Abstract The sorption kinetics and equilibrium isotherms of zirconium, uranium, and molybdenum ions onto synthetic polyaniline/SiO2 composite (PAn/SiO2) have been studied using batch-sorption techniques. This study was carried out to examine the sorption behavior of the PAn/SiO2 for the removal of Zr(IV), U(VI), and Mo(VI) ions from an aqueous solution. The influence of some parameters on the sorption process was also studied. The maximum sorption for Zr(IV), U(VI), and Mo(VI) ions was achieved at 60 min shaking time. Langmuir isotherm model is the most representative for discussing the sorption process with a maximum sorption capacity of 24.26, 21.82, and 13.01 mg/g for Zr(IV), U(VI), and Mo(VI) ions, respectively. Kinetic modeling revealed that the sorption of all ions follows the pseudo-second-order kinetic model. The results demonstrated that both the external and intra-particular diffusion are taken into account in determining the sorption rate. Thermodynamic parameters like ΔG°, ΔH°, and ΔS° for the sorption process were evaluated. The synthetic composite has been successfully applied for the removal and recovery of U(VI) ions from real solution (monazite leachate) using a chromatographic column packed with PAn/SiO2 composite with a breakthrough capacity equal to 239.70 mg/g.

scholarly journals Malachite Green Removal by Activated Potassium Hydroxide Clove Leaf Agrowaste Biosorbent: Characterization, Kinetic, Isotherm, and Thermodynamic Studies

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Dyan Hatining Ayu Sudarni ◽  
Uyiosa Osagie Aigbe ◽  
Kingsley Eghonghon Ukhurebor ◽  
Robert Birundu Onyancha ◽  
Heri Septya Kusuma ◽  
...  
Keyword(s):  
Malachite Green ◽  
Potassium Hydroxide ◽  
Low Cost ◽  
Cost Effective ◽  
Sorption Process ◽  
Water Soluble ◽  
Maximum Sorption Capacity ◽  
Effective Removal ◽  
Maximum Sorption

Although several approaches have been explored for the removal of dyes and other toxic materials from water as well as the entire environment, notwithstanding, researchers/scientists are still pursuing novel, low-cost, and eco-friendly biosorbents for the effective removal of such contaminants. Herein, clove leaves (CL) were utilized as a biosorbent for the sequestration of malachite green (MG) from a water-soluble solution. The CL was subsequently activated using potassium hydroxide (KOH) and characterized using the FTIR and FESEM to determine the functional groups on the activated clove leaves (CL-KOH) and the morphology of the adsorbent. The adsorption of MG was observed to be relatively dependent on the dosage of sorbent utilized, initial MG concentration, and sorption process contact time. The adsorption process of MG to CL was ideally described using the Dubinin–Radushkevich and Elovich models with the determination of maximum sorption capacity of approximately 131.6 mg·g-1. Furthermore, the thermodynamic parameters calculated showed that the adsorption of MG to the adsorbent was exothermic with the process involving physical sorption as well as chemical sorption processes with negligible adsorption energy. In conclusion, the study has revealed that the CL is a cost-effective biosorbent with high adsorption efficiency for the sequestration of MG from a water-soluble solution and can be recycled for further usage.

scholarly journals Metal Doping Silicates as Inorganic Ion Exchange Materials for Environmental Remediation

2021 ◽  
Author(s):  
Mamdouh Mohamed Abou-Mesalam ◽  
Mohamed Ragab Abass ◽  
Essam Saleh Zakaria ◽  
Ali Mostafa Hassan
Keyword(s):  
Ion Exchange ◽  
Environmental Remediation ◽  
Sorption Process ◽  
Distribution Coefficients ◽  
Maximum Sorption Capacity ◽  
Inorganic Ion ◽  
Liquid Solutions ◽  
Maximum Sorption ◽  
Langmuir Isotherm Model

Abstract Titano-silicate (TiSi) and in-situ dopped composites were obtained by precipitation technique. The composition of these materials was established by IR, XRD, TGA&DTA, and XRF. The capacity for Co(II), & Cd(II) ions revealed that Co-TiSi & Cd-TiSi is a higher capacity than those obtained for TiSi by 1.81, & 1.41 values, respectively. To explore the separation potentiality of Co-TiSi for studied cations distribution coefficients in HNO3 were estimated. Langmuir isotherm model is the most representative for discussing the sorption process with a maximum sorption capacity of 16.02, and 10.96 mg/g for Co(II), & Cd(II) ions, respectively. Co-TiSi is suitable for the column technique for the recovery of studied cations. The investigation proved that Co-TiSi composite is suitable for the uptake of the studied ions from liquid solutions and could be considered as potential material for the refining of effluent polluted with these ions.

The Use of Biomass of Apricot Kernels as a Material for the Extraction of Methylene Blue from Aqueous Media

2020 ◽  
Vol 24 (11) ◽  
pp. 36-40
Author(s):  
S.V. Sverguzova ◽  
Yu.A. Vinogradenko ◽  
I.G. Shaikhiev ◽  
R.Z. Galimova ◽  
E.S. Antyufeeva ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Aqueous Media ◽  
Correlation Coefficients ◽  
Sorption Process ◽  
Maximum Sorption Capacity ◽  
Sorption Material ◽  
Sorption Energy ◽  
Maximum Sorption ◽  
Apricot Kernels ◽  
Kernel Cca

The possibility of using a sorption material based on apricot kernels for the extraction of methylene blue (MG) dye from aqueous media is considered. The maximum sorption capacity of the material was established – 0.58 mmol/g (185.6 mg/g). The obtained isotherm was processed within the framework of monomolecular and polymolecular adsorption models. The equations that most accurately describe the isotherm are determined, and the correlation coefficients are calculated. It has been shown that the sorption isotherm of the MG dye by the crushed apricot kernel (CCA) is best described by the Langmuir (R2 = 0.9724) and Dubinin-Radushkevich (R2 = 0.9818) models. However, when comparing the plots of the function A = f(Ce) of the sorption processes of the dye by the CCA sorbent according to the models under study with the experimental dependence, it was found that the sorption process is most accurately described by the sorption models of Dubinin-Radushkevich and Temkin. Using the equations of the Langmuir and Dubinin-Radushkevich models, the thermodynamic parameters of the process were calculated: the sorption energy (E = 8.066 kJ/ mol) and the Gibbs energy (∆Go = -8.597 kJ/mol).

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.

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