scholarly journals Equilibrium and kinetics study on removal of arsenate ions from aqueous solution by CTAB/TiO2 and starch/CTAB/TiO2 nanoparticles: a comparative study

2016 ◽  
Vol 15 (1) ◽  
pp. 58-71
Author(s):  
Pankaj Gogoi ◽  
Debasish Dutta ◽  
Tarun Kr. Maji
Keyword(s):  
Comparative Study ◽  
Tio2 Nanoparticles ◽  
Removal Rate ◽  
Ammonium Bromide ◽  
X Ray ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Equilibrium And Kinetics ◽  
Sorption Mechanisms

We present a comparative study on the efficacy of TiO2 nanoparticles for arsenate ion removal after modification with CTAB (N-cetyl-N,N,N-trimethyl ammonium bromide) followed by coating with starch biopolymer. The prepared nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), thermogravimetry, scanning electron microscopy (SEM) and electron dispersive X-ray analysis (EDX). The removal efficiency was studied as a function of contact time, material dose and initial As(V) concentration. CTAB-modified TiO2 showed the highest arsenate ion removal rate (∼99% from 400 μg/L). Starch-coated CTAB-modified TiO2 was found to be best for regeneration. For a targeted solution of 400 μg/L, a material dose of 2 g/L was found to be sufficient to reduce the As(V) concentration below 10 μg/L. Equilibrium was established within 90 minutes of treatment. The sorption pattern followed a Langmuir monolayer pattern, and the maximum sorption capacity was found to be 1.024 mg/g and 1.423 mg/g after starch coating and after CTAB modification, respectively. The sorption mechanisms were governed by pseudo second order kinetics.

scholarly journals Phosphate Removal Using Polyethylenimine Functionalized Silica-Based Materials

2021 ◽  
Vol 13 (3) ◽  
pp. 1502
Author(s):  
Maria Xanthopoulou ◽  
Dimitrios Giliopoulos ◽  
Nikolaos Tzollas ◽  
Konstantinos S. Triantafyllidis ◽  
Margaritis Kostoglou ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Removal Rate ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Equilibrium Studies ◽  
Maximum Sorption Capacity ◽  
Algae Blooms ◽  
Maximum Sorption ◽  
Phosphate Anions ◽  
Adsorbent Dose

In water and wastewater, phosphate anions are considered critical contaminants because they cause algae blooms and eutrophication. The present work aims at studying the removal of phosphate anions from aqueous solutions using silica particles functionalized with polyethylenimine. The parameters affecting the adsorption process such as pH, initial concentration, adsorbent dose, and the presence of competitive anions, such as carbonate, nitrate, sulfate and chromate ions, were studied. Equilibrium studies were carried out to determine their sorption capacity and the rate of phosphate ions uptake. The adsorption isotherm data fitted well with the Langmuir and Sips model. The maximum sorption capacity was 41.1 mg/g at pH 5, which decreased slightly at pH 7. The efficiency of phosphate removal adsorption increased at lower pH values and by increasing the adsorbent dose. The maximum phosphate removal was 80% for pH 5 and decreased to 75% for pH 6, to 73% for pH 7 and to 70% for pH 8, for initial phosphate concentration at about 1 mg/L and for a dose of adsorbent 100 mg/L. The removal rate was increased with the increase of the adsorbent dose. For example, for initial phosphate concentration of 4 mg/L the removal rate increased from 40% to 80% by increasing the dose from 0.1 to 2.0 g/L at pH 7. The competitive anions adversely affected phosphate removal. Though they were also found to be removed to a certain extent. Their co-removal provided an adsorbent which might be very useful for treating waters with low-level multiple contaminant occurrence in natural or engineered aquatic systems.

scholarly journals Magnetized Chitosan Nanocomposite as an Effective Adsorbent for the Removal of Methylene Blue and Malachite Green Dyes

2021 ◽  
Author(s):  
Fouzia Mashkoor ◽  
Abu Nasar
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Malachite Green ◽  
Batch Mode ◽  
X Ray ◽  
Maximum Sorption Capacity ◽  
Transmission Electron ◽  
Maximum Sorption ◽  
Equilibrium Data ◽  
Adsorption Equilibrium Data

Abstract Herein, a magnetically separable Fe3O4 decorated chitosan was facilely synthesized, systematically characterized, and subsequently employed as a versatile adsorbing material for the adsorption of malachite green and methylene blue dyes. The prepared adsorbent was characteristically examined through Fourier transform infra-red microscopy, scanning electron microscopy with energy-dispersive X-ray analysis, transmission electron microscopy X-ray diffraction, Brunauere-Emmette-Teller surface area analysis, thermogravimetric analysis, and vibrating-sample magnetometry techniques. The performance of adsorbent was studied in batch mode and the the time-dependent experimental data were analyzed with different kinetic models, and pseudo-IInd-order was provided the best fit for the adsorption of both the dyes with a high value of the regression coefficient. The adsorption equilibrium data of both the dyes was best explained by Langmuir isotherm, and the maximum sorption capacity of MG and MB was found to be 55.86 and 76.34 mg g-1, respectively. Thermodynamic analysis declared that the adsorption of MG and MB onto the MChi was endothermic and spontaneous in nature. Moreover, the adsorbent presented good reusability up to three successive ad-/de-sorption cycles, indicating that MChi is a promising applicant for the treatment of dye-containing wastewater.

scholarly journals Graphene Oxide/Polyvinyl Alcohol/Fe3O4 Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Thu Dieu Le ◽  
Luyen Thi Tran ◽  
Hue Thi Minh Dang ◽  
Thi Thu Huyen Tran ◽  
Hoang Vinh Tran
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Order Kinetic Model ◽  
Metal Treatment ◽  
Pseudo Second Order ◽  
Adsorption Of Co2

In this work, an effective nanocomposite-based adsorbent directed to adsorb cobalt (Co2+) ion was successfully synthesized from graphene oxide (GO), polyvinyl alcohol (PVA), and magnetite (Fe3O4) nanoparticles via a coprecipitation technique. The synthesized GO/PVA/Fe3O4 nanocomposite was applied for Co2+ ion removal with the optimized working conditions including 100 min of contact time, 0.01 g of adsorbent dosage, pH of 5.2, and 50°C of temperature. The investigation of adsorption kinetics showed that the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite followed the pseudo-second-order kinetic model with the rate constant k2 being 0.0026 (g mg−1·min−1). The Langmuir model is suitable to describe the adsorption of Co2+ ion onto the GO/PVA/Fe3O4 nanocomposite with the maximum sorption capacity (qmax) reaching 373.37 mg·g−1. The obtained results also indicated that the GO/PVA/Fe3O4 nanocomposite can adsorb/regenerate for at least 5 cycles with a little reduction in removal efficiency. Therefore, we believe that the GO/PVA/Fe3O4 nanocomposite could be used as a potential adsorbent for heavy metal treatment in terms of high adsorption capacity, fast adsorption rate, and recyclability.

scholarly journals A Highly Efficient Environmental-Friendly Adsorbent Based on Schiff Base for Removal of Cu(II) from Aqueous Solutions: A Combined Experimental and Theoretical Study

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5164
Author(s):  
Said Tighadouini ◽  
Othmane Roby ◽  
Smaail Radi ◽  
Zouhair Lakbaibi ◽  
Rafik Saddik ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Schiff Base ◽  
High Selectivity ◽  
Theoretical Study ◽  
X Ray ◽  
Maximum Sorption Capacity ◽  
Removal Of Heavy Metals ◽  
Maximum Sorption ◽  
Spectroscopy Studies ◽  
Adsorption Desorption

Removal of heavy metals from drinking water sources and rivers is of strategic health importance and is essential for sustainable ecosystem development, in particular in polluted areas around the globe. In this work, new hybrid inorganic-organic material adsorbents made of ortho- (Si-o-OR) or para-Schiff base silica (Si-p-OR) were synthesized and characterized in depth. These hybrid adsorbents show a high selectivity to Cu(II), even in the presence of competing heavy metals (Zn(II), Cd(II), and Pb(II)), and also demonstrate great reusability after five adsorption-desorption cycles. Maximum sorption capacity for Cu(II) was found for Si-o-OR (79.36 mg g−1) and Si-p-OR (36.20 mg g−1) in no less than 25 min. Energy dispersive X-ray fluorescence and Fourier transform-infrared spectroscopy studies demonstrate that this uptake occurs due to a chelating effect, which allows these adsorbents to trap Cu(II) ions on their surfaces; this result is supported by a theoretical study for Si-o-OR. The new adsorbents were tested against real water samples extracted from two rivers from the Oriental region of Morocco.

scholarly journals Removal of Salicylic and Ibuprofen by Hexadecyltrimethylammonium-Modified Montmorillonite and Zeolite

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 898
Author(s):  
Jiyeon Choi ◽  
Won Sik Shin
Keyword(s):  
Sorption Isotherms ◽  
Organic Carbon Content ◽  
Sorption Data ◽  
Maximum Sorption Capacity ◽  
Ideal Adsorbed Solution Theory ◽  
Modified Montmorillonite ◽  
Maximum Sorption ◽  
Competitive Model ◽  
Sorption Mechanisms ◽  
Positively Charged

The removal of salicylic acid (SA) and ibuprofen (IB) by sorption onto HDTMA-modified montmorillonite (HM) and zeolite (HZ) was investigated at pH 7. The single sorption data were fitted well by the Freundlich, Langmuir, Dubinin−Radushkevich (DR), and Polanyi−Dubinin−Manes (PDM) models (R2 > 0.94). The sorption affinity of Freundlich and the maximum sorption capacity of Langmuir and PDM models of pharmaceuticals onto HM were consistently higher than that of HZ mainly owing to the higher organic carbon content. In addition, the KF, qmL, and qm values were in the order of IB > SA owing to higher hydrophobicity and molar volume. Since the predominant speciation of SA and IB is anionic at pH 7 (>pKa), sorption onto HM occurs mainly by the two-dimensional surface adsorption onto the pseudo-organic medium in the HM, whereas the interaction of anionic pharmaceuticals with the positively charged “head” of HDTMA is responsible for HZ. Sorption isotherms were fitted well by the PDM model, which indicated that pore-filling was one of the dominating sorption mechanisms. The extended Langmuir model, modified Langmuir competitive model, and ideal adsorbed solution theory employed with Freundlich and Langmuir sorption models were applied to predict binary sorption. The effect of competition between the solutes was clearly evident in the characteristic curves; the maximum sorbed volume (qv.m) was reduced, and the sorbed volume (qv) had a wider distribution toward the sorption potential density.

scholarly journals Enhanced Removal of Lead by Chemically and Biologically Treated Carbonaceous Materials

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Mohamed E. Mahmoud ◽  
Maher M. Osman ◽  
Somia B. Ahmed ◽  
Tarek M. Abdel-Fattah
Keyword(s):  
Active Carbon ◽  
Isotherm Models ◽  
Infrared Analysis ◽  
Carbonaceous Materials ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Potential Applications ◽  
Microscope Imaging ◽  
Carbonaceous Sorbents ◽  
Sorption Mechanisms

Hybrid sorbents and biosorbents were synthesized via chemical and biological treatment of active carbon by simple and direct redox reaction followed by surface loading of baker’s yeast. Surface functionality and morphology of chemically and biologically modified sorbents and biosorbents were studied by Fourier Transform Infrared analysis and scanning electron microscope imaging. Hybrid carbonaceous sorbents and biosorbents were characterized by excellent efficiency and superiority toward lead(II) sorption compared to blank active carbon providing a maximum sorption capacity of lead(II) ion as 500 μmol g−1. Sorption processes of lead(II) by these hybrid materials were investigated under the influence of several controlling parameters such as pH, contact time, mass of sorbent and biosorbent, lead(II) concentration, and foreign ions. Lead(II) sorption mechanisms were found to obey the Langmuir and BET isotherm models. The potential applications of chemically and biologically modified-active carbonaceous materials for removal and extraction of lead from real water matrices were also studied via a double-stage microcolumn technique. The results of this study were found to denote to superior recovery values of lead (95.0–99.0±3.0–5.0%) by various carbonaceous-modified-bakers yeast biosorbents.

scholarly journals Application of Zeolite Nanofiltration for Removal of Heavy Metals from Urban Wastewater

2020 ◽  
Vol 1 (4) ◽  
pp. 7-12
Author(s):  
Azwan Morni
Keyword(s):  
Sorption Capacity ◽  
Hybrid Membrane ◽  
Transmembrane Pressure ◽  
Hydraulic Permeability ◽  
Nickel Ions ◽  
X Ray ◽  
Maximum Sorption Capacity ◽  
Low Concentrations ◽  
Removal Of Heavy Metals ◽  
Maximum Sorption

In this study, the adsorption and the filtration processes were coupled by a zeolite nanoparticle impregnated polysulfone (PSf) membrane which was used to remove the lead and the nickel cations from synthetically prepared solutions. The results obtained from X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis indicated that the synthesized zeolite nanoparticles, using the conventional hydrothermal method, produced a pure NaX with ultrafine and uniform particles. The performance of the hybrid membrane was determined under dynamic conditions. The results also revealed that the sorption capacity, as well as the water hydraulic permeability of the membranes, could both be improved by simply tuning the membrane fabricating conditions such as evaporation period of the casting film and NaX loading. The maximum sorption capacity of the hybrid membrane for the lead and nickel ions was measured as 682 and 122 mg/g respectively at the end of 60 min of filtration, under 1 bar of transmembrane pressure. The coupling process suggested that membrane architecture could be efficiently used for treating metal solutions with low concentrations and transmembrane pressures.

scholarly journals Preparation of Nanocomposite Heteropoly Metalate Based Graphene Oxide: Insight into Cadmium Adsorption

2017 ◽  
Vol 7 (3) ◽  
Author(s):  
Hanieh Fakhri
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Metal Ion ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Vis Spectroscopy ◽  
Maximum Sorption ◽  
Ft Ir ◽  
Cadmium Adsorption ◽  
Excellent Stability

We developed a facile strategy for preparation of heteropoly metalate/graphene oxide nanocomposite as a new ion exchanger for cadmium ion removal from aqueous solution. The synthesized nanocomposite was characterized by X-ray powder diffraction (XRD), UV-Vis spectroscopy, FT-IR spectroscopy and Raman spectroscopy. Our findings indicated that the combination of heteropoly metalate nanoparticles with graphene oxide results in an excellent performance for cadmium ions removal of aqueous solution. The experimental data demonstrated that the adsorption isotherm fitted well by Langmuir model with maximum sorption capacity of 47.85 mg/g. The removal behavior of this compound was evaluated by various parameters such as contact time, concentration of metal ion, pH of solution and temperature. In addition, the effect of interfering cations on the cadmium adsorption is investigated. Dubinin–Radushkevich model represented physical sorption occurred as bold mechanism that is confirmed by thermodynamic parameters. Also, the obtained data of the recycling experiment presented excellent stability after 4 consecutive cycles.  This study indicated heteropoly metalate supported graphene oxide with good performance for removal of cadmium can be used for treating polluted solution by other heavy metal.

scholarly journals Nickel Recovery from Aqueous Solution Using Crab Shell Particles

2005 ◽  
Vol 23 (4) ◽  
pp. 303-312 ◽  
Author(s):  
Kuppusamy Vijayaraghavan ◽  
Joseph Raj Jegan ◽  
Kandasamy Palanivelu ◽  
Manickam Velan
Keyword(s):  
Aqueous Solution ◽  
Crab Shell ◽  
Nickel Ion ◽  
Freundlich Model ◽  
Nickel Ions ◽  
Maximum Sorption Capacity ◽  
Nickel Recovery ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Shell Particles

The potential use of crab shell as a sorbent for the removal of nickel(II) ions from aqueous solution was investigated. The binding of nickel ions by crab shell was found to be affected significantly by pH, with the maximum sorption capacity being observed at pH 4.5. The sorption isotherm was well represented using the Freundlich model. Nickel(II) ion removal by crab shell was mainly influenced by the removal of calcium carbonate, proteins and chitin, indicating the importance of these components in nickel ion binding. Co-ions such as Cu2+, Co2+, Cd2+, Zn2+ and Mg2+ affected the Ni(II) ion removal efficiency of crab shell. The biosorbed Ni(II) ions were effectively eluted by various mineral acids, EDTA solutions and NH4OH. Of these, the sodium salt of EDTA (0.01 M) in NH4OH appeared to be the best eluant, being capable of desorbing more than 99% of the sequestered Ni(II) ions with insignificant damage to the shell particles. The biosorbent could be regenerated and re-used in five sorption—elution cycles.

scholarly journals Cationic Dye Removal Using Novel Magnetic/Activated Charcoal/β-Cyclodextrin/Alginate Polymer Nanocomposite

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 170 ◽  
Author(s):  
Sushma Yadav ◽  
Anupama Asthana ◽  
Rupa Chakraborty ◽  
Bhawana Jain ◽  
Ajaya Kumar Singh ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Activated Charcoal ◽  
Removal Rate ◽  
Polymer Nanocomposite ◽  
Water Soluble ◽  
Cationic Dye ◽  
Polymer Gel ◽  
X Ray ◽  
Equilibrium And Kinetics ◽  
Equilibrium Data

New magnetic iron oxide (Fe3O4)/activated charcoal (AC)/β-cyclodextrin (CD)/sodium alginate (Alg) polymer nanocomposite materials were prepared by direct mixing of the polymer matrix with the nanofillers. The obtained materials were utilized as nano-adsorbents for the elimination of methylene blue (MB), a hazardous water-soluble cationic dye, from aqueous solutions, and showed excellent regeneration capacity. The formation of the nanocomposites was followed by high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometry (EDX), Fourier-transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and adsorption of N2 at −196 °C. The rate of adsorption was investigated varying several factors, namely contact time, pH, amount of adsorbent and MB concentration on the adsorption process. Studies dealing with equilibrium and kinetics were carried out in batch conditions. The obtained results indicated that the removal rate of MB was 99.53% in 90 min. Langmuir’s isotherm fitted better to the equilibrium data of MB. Fe3O4/AC/CD/Alg polymer beads shows amazing adsorption capacities in the elimination of cationic dyes (2.079 mg/g for polymer gel beads and 10.63 mg g−1 for dry powder beads), in comparison to other adsorbent materials. The obtained adsorbent is spherical with hydrophobic cross-linked surface properties that enable an easy recovery without any significant weight loss of in the adsorbent used.

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