Preparation of chitosan functionalized polyamidoamine for the separation of trivalent lanthanides from acidic waste solution

2019 ◽  
Vol 107 (5) ◽  
pp. 415-422
Author(s):  
S. Pahan ◽  
S. Panja ◽  
D. Banerjee ◽  
P. S. Dhami ◽  
J. S. Yadav ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Water Solution ◽  
Sorption Process ◽  
Waste Solution ◽  
Maximum Sorption Capacity ◽  
Increasing Trend ◽  
Maximum Sorption ◽  
Langmuir Isotherm Model ◽  
Kinetics Of ◽  
Solution Kinetics

Abstract The manuscript deals with the sorption of Am(III) and Eu(III) from pH medium using chitosan functionalized with dendrimer like polyamidoamine (PAMAM) polymers up to third generation. The PAMAM polymers were introduced into chitosan by two step processes and were characterized by various instrumental techniques like FTIR, XRD, TG-DTA. The sorption process was highly pH dependent for both Am(III) and Eu(III) with increasing trend for higher pH of the solution. Kinetics of equilibration was found to be fast with equilibrium attained in 10 min for both the metal ions. Pseudo 2nd order kinetics mechanism was found to be followed for both Am(III) and Eu(III). The sorption process of Eu(III) was found to fit the Langmuir isotherm model with maximum sorption capacity of 6.01 mg/g. There was no effect on the generation of PAMAM Dendron on the efficiency, kinetics or sorption capacity for Am(III) as well as Eu(III). The synthesized different generation of PAMAM functionalized chitosan is a promising material for removal of actinides and lanthanides from waste water solution.

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.

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.

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 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.

A Study of the Adsorption of Ni2+ Ions by Modified Peanut Processing Wastes

2020 ◽  
Vol 24 (3) ◽  
pp. 39-43
Author(s):  
S.V. Sverguzova ◽  
I.G. Shaikhiev ◽  
L. Hunadi ◽  
I.V. Bomba
Keyword(s):  
Sorption Capacity ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Maximum Sorption Capacity ◽  
Model Solutions ◽  
Heat Treated ◽  
Sorption Purification ◽  
Maximum Sorption ◽  
Processing Wastes ◽  
Kinetics Of

The sorption purification of model solutions from Ni2+ ions was studied using, as sorption materials, ground peanut peel of the original and heat-treated at a temperature of 250 °C and 350 °C. Isotherms of adsorption of Ni2+ ions by sorption materials were constructed in the range of initial concentrations up to 1000 mg/dm3 of the initial and thermally modified peanut peel. Isotherms are processed in the framework of the Langmuir, Freundlich and BET models. The kinetics of adsorption of Ni2+ ions by the initial and heat-treated peanut peel was studied. It was experimentally determined that the maximum sorption capacity of the initial peanut peel at an initial concentration of Ni2+ 1000 mg/dm3 ions is 0.6 mmol/g, and for annealed at 250 and 350 ° C – 0.66 and 0.78 mmol/g, respectively.

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.

scholarly journals Removal of the herbicide 2,4-dichlorophenoxyacetic acid from water by using an ultrahighly efficient thermochemically activated carbon

2019 ◽  
Vol 73 (4) ◽  
pp. 223-237
Author(s):  
Danijela Bojic ◽  
Milos Kostic ◽  
Miljana Radovic-Vucic ◽  
Nena Velinov ◽  
Slobodan Najdanovic ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Sorption Capacity ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Activation Process ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
High Sorption ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Lagenaria Vulgaris

Lagenaria vulgaris activated carbon (LVAC) was synthesized from Lagenaria vulgaris biomass by treatment with diluted H2SO4 followed by thermo-chemical carbonization and overheated steam activation process and used for removal of the herbicide 2,4-dichlo-rophenoxyacetic acid (2,4-D). Fourier transform infrared spectroscopy (FTIR) indicated that 2,4-D is adsorbed in micropores of the very porous LVAC (665 m2 g-1). LVAC showed high sorption capacity as compared to many previously used sorbents at optimal conditions: the stirring rate of 300 rpm, the sorbent dose of 1.0 g dm-3 and pH from 2 to 7. The experimental maximum sorption capacity of LVAC was 333.3 mg g-1. The pseudo-second-order model and Chrastil model described the 2,4-D sorption kinetics by LVAC. Thermodynamic studies have indicated that the sorption process was endothermic, spontaneous and physical in nature. LVAC was shown to be an ultrahighly efficient sorbent for removal of 2,4-D from groundwater, which could be also recycled and reused.

Природные материалы для сорбционной очистки хром- и кадмийсодержащих инфильтратов полигонов ТБО

2019 ◽  
pp. 13-19
Author(s):  
A. Safonov ◽  
N. Andriushchenko ◽  
N. Popova ◽  
K. Boldyrev
Keyword(s):  
Sorption Capacity ◽  
Electron Acceptors ◽  
Bacterial Cells ◽  
Maximum Sorption Capacity ◽  
Sorption Material ◽  
Maximum Sorption ◽  
Properties Of Materials ◽  
Solid Waste Landfills ◽  
Sorption Characteristics

Проведен анализ сорбционных характеристик природных материалов (вермикулит, керамзит, перлит, цеолит Трейд ) при очистке кадмий- и хромсодержащих сточных вод с высокой нагрузкой по ХПК. Установлено, что цеолит обладает максимальными сорбционными характеристиками для Cd и Cr и наименьшим биологическим обрастанием. При использовании вермикулита и керамзита или смесей на их основе можно ожидать увеличения сорбционной емкости для Cd и Сr при микробном обрастании, неизбежно происходящем в условиях контакта с водами, загрязненными органическими соединениями и биогенами. При этом биообрастание может повысить иммобилизационную способность материалов для редоксзависимых металлов за счет ферментативных ресурсов бактериальных клеток, использующих их в качестве акцепторов электронов. Эффект микробного обрастания разнонаправленно изменял параметры материалов: для Cr в большинстве случаев уменьшение и для Cd значительное увеличение. При этом дополнительным эффектом иммобилизации Cr является его биологическое восстановление биопленками. Варьируя состав сорбционного материала, можно подбирать смеси, оптимально подходящие для очистки вод инфильтратов с полигонов твердых бытовых отходов с высокой нагрузкой по ХПК и биогенным элементам как при использовании in situ, так и в системах на поверхности.The analysis of the sorption characteristics of natural materials (vermiculite, expanded clay, perlite, Trade zeolite) during the purification of cadmium and chromium-containing leachate with a high COD load was carried out. It was determined that zeolite had the maximum sorption capacity for Cd and Cr and the lowest biological fouling. When using vermiculite and expanded clay or mixtures on their basis, one can expect an increase in the sorption capacity for Cd and Cr during microbial fouling that inevitably occurs during contacting with water polluted with organic compounds and nutrients. In this case biofouling can increase the immobilization properties of materials for redox-dependent metals due to the enzymatic resources of bacterial cells that use them as electron acceptors. The effect of microbial fouling changed the parameters of materials in different directions: for Cr, in most cases, downward, and for Cd, significantly upward. Moreover, chromium biological recovery by biofilms is an additional effect of immobilization. Varying the composition of the sorption material provides for selecting mixtures that are optimally suitable for the purification of leachates from solid waste landfills with high COD and nutrients load, both when used in situ and in surface systems.

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