Functionalization of Zeolite NaP1 for Simultaneous Acid Red 18 and Cu(II) Removal

The efficiency of azo dye Acid Red 18 (AR18) and Cu(II) ions simultaneous removal from an aqueous solution on NaP1CS and NaP1H was investigated, taking into account the effect of the phase contact time, pH, initial concentration, temperature, and interfering ions presence. Zeolite denoted as NaP1CS was modified by chitosan (CS) and zeolite denoted as NaP1H was modified by hexadecyltrimethylammonium bromide (HDTMA). In order to characterize sorption properties of NaP1CS, the obtained sorbent was characterized using Fourier transform infrared spectroscopy (FTIR) and nitrogen adsorption/desorption (ASAP). The kinetic parameters were determined by means of the pseudo first order (PFO), pseudo second order (PSO), and intraparticle diffusion (IPD) kinetic models. To present the adsorption data, three different isotherm models (Langmuir, Freundlich and Dubinin-Radushkevich) were used. The desorption process was also examined. It was found that for sorbent NaP1CS the pseudo second order (PSO) kinetic model and the Langmuir isotherm fitted best the experimental data. Moreover, it was noted that the acidic pH is appropriate to achieve the best sorption properties of NaP1CS for Cu(II) and NaP1H for AR18 and Cu(II). The thermodynamic parameters indicate an endothermic process. The most effective solution for the desorption process was found to be 1 M HCl. The results indicate that simultaneous removal of dye AR18 and Cu(II) on modified zeolite NaP1CS or NaP1H is possible and proceeds with a very good efficiency. The obtained zeolites could effectively adsorb AR18 an Cu(II) simultaneously, but their adsorption abilities were rather different.

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Investigation of competitive adsorption and desorption of heavy metals from aqueous solution using raw rock: Characterization kinetic, isotherm, and thermodynamic

MATEC Web of Conferences ◽

10.1051/matecconf/202134801016 ◽

2021 ◽

Vol 348 ◽

pp. 01016

Author(s):

Rajaa Bassam ◽

Marouane El Alouani ◽

Nabila Jarmouni ◽

Jabrane Maissara ◽

Mohammed El Mahi Chbihi ◽

...

Keyword(s):

Heavy Metals ◽

Adsorption Process ◽

Freundlich Isotherm ◽

Langmuir Model ◽

Second Order ◽

Isotherm Models ◽

Desorption Process ◽

Pseudo Second Order ◽

Rock Characterization ◽

Metals Adsorption

Heavy metals are the most dangerous inorganic pollutants Due to their bioaccumulation and their nonbiodegradability, for this, several studies have focused on the recovery of these metals from water using different techniques. In this context, our study consists of evaluating an efficient and eco-friendly pathway of competitive recovery of heavy metals (Cd, Cr and As) from aqueous solutions by adsorption using raw rock. This adsorbent was characterized before and after the adsorption process by several techniques. The multi-metals adsorption process in the batch mode was undertaken to evaluate the effect of adsorbent mass, contact time, pH, Temperature, and initial heavy metals concentration. The kinetic data were analyzed using the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models. According to the modeling of the experimental results, the adsorption kinetics of heavy metals were adapted to the pseudo-second-order model. The adsorption isotherms were evaluated by the Langmuir and Freundlich isotherm models. The experimental isotherm data of heavy metals were better fitted with the Langmuir model rather than Freundlich isotherm models. The maximum experimental adsorption capacities (Qmax) predicted by the Langmuir model are 15.23 mg/g for Cd (II), 17.54 mg/g for Cr (VI) and 16.36 mg/g for As (III). The values of thermodynamic parameters revealed that the heavy metals adsorption was exothermic, favorable, and spontaneous in nature. The desorption process of heavy metals showed that this raw rock had excellent recycling capacity. Based on the results, these untreated clays can be used as inexpensive and environmentally friendly adsorbents to treat water contaminated by heavy metals.

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Chiral poly(amide-imide)/ZnS nanocomposite as a new adsorbent for simultaneous removal of cationic dyes from aqueous solution

High Performance Polymers ◽

10.1177/0954008320939144 ◽

2020 ◽

pp. 095400832093914

Author(s):

Maryam Sadeghi ◽

Zahra Rafiee

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

High Efficiency ◽

Second Order ◽

Isotherm Models ◽

Simultaneous Removal ◽

Base Interaction ◽

X Ray ◽

Operational Variables ◽

Pseudo Second Order

A new adsorbent, poly(amide-imide)/zinc sulfide nanocomposite (PAI/ZnS NC), was fabricated and identified by Fourier-transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, field emission-scanning electron microscopy, and transmission electron microscopy. Then, the obtained NC was applied for the simultaneous removal of auramine O (AO) and rhodamine B (RB) dyes from aqueous solution via the interactions of hydrogen bonding, π– π stacking, and Lewis acid–base interaction. The effects of operational variables including pH, PAI/ZnS NC mass, AO and RB concentration, and sonication time on removal efficiency were examined and optimized values were found to be 8.0, 16 mg, 11 mg L−1, and 6 min, respectively. The adsorption capacities of PAI/ZnS NC for the removal of AO and RB dyes were found to be 70.92 and 91.74 mg g−1, respectively. Ultraviolet–visible spectrophotometer was used to determine the amount of residual dye in solution. Fitting the experimental equilibrium data to isotherm models such as Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich reveals the suitability of the Langmuir model with high correlation coefficients ( R 2 = 0.998 for AO and R 2 = 0.999 for RB). Pseudo-first-order, pseudo-second-order, intraparticle diffusion, and Elovich kinetic models applicability was tested and the pseudo-second-order equation controls the kinetics of the adsorption process. Furthermore, this study establishes that PAI/ZnS NC can be successfully applied as a low-cost adsorbent and conserve its high efficiency after nine cycles for the removal of AO and RB dyes.

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Sorption of Ce(III) by Silica SBA-15 and Titanosilicate ETS-10 from Aqueous Solution

Water ◽

10.3390/w13223263 ◽

2021 ◽

Vol 13 (22) ◽

pp. 3263

Author(s):

Inga Zinicovscaia ◽

Nikita Yushin ◽

Doina Humelnicu ◽

Dmitrii Grozdov ◽

Maria Ignat ◽

...

Keyword(s):

Nitrogen Adsorption ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

X Ray Diffraction ◽

Maximum Sorption Capacity ◽

Maximum Sorption ◽

Pseudo Second Order ◽

Ph Range ◽

Adsorption Desorption

The adsorption capacity of two sorbents, silica SBA-15 and titanosilicate ETS-10, toward Ce(III) was tested. The obtained sorbents were characterized using X-ray diffraction, nitrogen adsorption-desorption, Scanning electron microscopy, and Fourier-transform infrared spectroscopy. The effects of solution acidity, cerium concentration, time of contact, and temperature on Ce(III) sorption were investigated. The maximum Ce(III) removal by silica SBA-15 was achieved at pH 3.0 and by titanosilicate ETS-10 at a pH range of 4.0–5.0. The Freundlich, Langmuir, and Temkin isotherm models were applied for the description of equilibrium sorption of Ce(III) by the studied absorbents. Langmuir model obeys the experimentally obtained data for both sorbents with a maximum sorption capacity of 68 and 162 mg/g for silica SBA-15 and titanosilicate ETS-10, respectively. The kinetics of the sorption were described using pseudo-first- and pseudo-second-order kinetics, Elovich, and Weber–Morris intraparticle diffusion models. The adsorption data fit accurately to pseudo-first- and pseudo-second-order kinetic models. Thermodynamic data revealed that the adsorption process was spontaneous and exothermic.

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Kinetics and equilibrium of the sorption of bisphenol A by carbon nanotubes from wastewater

Water Science & Technology ◽

10.2166/wst.2013.373 ◽

2013 ◽

Vol 68 (6) ◽

pp. 1306-1314 ◽

Cited By ~ 25

Author(s):

J. Bohdziewicz ◽

G. Kamińska

Keyword(s):

Carbon Nanotubes ◽

Bisphenol A ◽

Nitrogen Adsorption ◽

Second Order ◽

Synthetic Wastewater ◽

Competitive Sorption ◽

Outer Diameter ◽

Graphene Layers ◽

Pseudo Second Order ◽

Sorption Potential

The aim of this study was to determine the sorption potential of carbon nanotubes (CNTs) to bisphenol A (BPA) contained in synthetic wastewater whose composition corresponds to biologically treated effluents. These nanotubes differed in their outer diameter, the number of graphene layers and the presence of modifying functional groups. Based on the nitrogen adsorption–desorption isotherms, mensuration of the specific surface area and pore size distribution was undertaken. The porous structure of the CNTs was bidispersive; the majority consisted of micropores, there was an average fraction of mesopores, and macropores did not occur. On the basis of common kinetics models (pseudo-first-order and pseudo-second-order models), a trial of modelling the kinetics of BPA sorption onto nanotubes was undertaken. The experimental data were well fitted only to the pseudo-second-order models. The kinetics study indicated that adsorption of BPA on CNTs proceeded very fast, with the majority of the adsorbate being adsorbed in the first few seconds. The sorption capacity of nanotubes to BPA was the highest for single-walled CNTs. A decrease in the sorption potential of the nanotubes for higher pH values occurred as a result of the deprotonation of the BPA and formation of bisphenolate anions, consequently leading to a decrease of π–π (hydrophobic) interaction and enhancing electrostatic repulsion. Overall, these results unequivocally confirm the ideal performance and potential of nanotubes for removal of micropollutants from synthetic wastewater. Replicating the conditions occurring in real wastewater allows us to expect a high sorption of BPA in real competitive sorption systems.

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Kinetic and equilibrium studies of fluoride sorption onto surfactant-modified smectites

Clay Minerals ◽

10.1180/claymin.2012.047.4.03 ◽

2012 ◽

Vol 47 (4) ◽

pp. 429-440 ◽

Cited By ~ 7

Author(s):

S. Gamoudi ◽

N. Frini-Srasra ◽

E. Srasra

Keyword(s):

Aqueous Solution ◽

Thermodynamic Parameters ◽

Adsorption Kinetics ◽

Equilibrium Constants ◽

Second Order ◽

Operating Conditions ◽

Polluted Water ◽

Isotherm Models ◽

Fluoride Ions ◽

Pseudo Second Order

AbstractThe use of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent studies. In the present work, a Tunisian smectite modified with two cationic surfactants was used as an adsorbent to examine the adsorption kinetics, isotherms and thermodynamic parameters of fluoride ions from aqueous solution. Various pH values, initial concentrations and temperatures have been tested. Two simplified kinetic models, first-order and pseudo-second-order, were used to predict the adsorption rate constants. It was found that the adsorption kinetics of fluoride onto modified smectites at different operating conditions can best be described by the pseudo-second-order model. Adsorption isotherms and equilibrium adsorption capacities were determined by the fitting of the experimental data to well known isotherm models including those of Langmuir and Freundlich. The results showed that the Langmuir model appears to fit the adsorption better than the Freundlich adsorption model for the adsorption of fluoride ions onto modified smectites. The equilibrium constants were used to calculate thermodynamic parameters, such as the change of free energy, enthalpy and entropy. Results of this study demonstrated the effectiveness and feasibility of organoclays for the removal of fluoride ions from aqueous solution.

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The Equilibrium, Kinetics, and Thermodynamics Studies of the Sorption of Methylene Blue from Aqueous Solution Using Pulverized Raw Macadamia Nut Shells

Journal of Analytical Methods in Chemistry ◽

10.1155/2020/8840666 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Joshua N. Edokpayi ◽

Samson O. Alayande ◽

Ahmed Adetoro ◽

John O. Odiyo

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Surface Area ◽

Low Cost ◽

Aqueous Media ◽

Group Analysis ◽

Second Order ◽

Isotherm Models ◽

Macadamia Nut ◽

Pseudo Second Order

In this study, the potential for pulverized raw macadamia nut shell (MNS) for the sequestration of methylene blue from aqueous media was assessed. The sorbent was characterized using scanning electron microscopy for surface morphology, functional group analysis was performed with a Fourier-transform infrared spectrometer (FT-IR), and Brunauer–Emmett–Teller (BET) isotherm was used for surface area elucidation. The effects of contact time, sorbent dosage, particle size, pH, and change in a solution matrix were studied. Equilibrium data were fitted using Temkin, Langmuir, and Freundlich adsorption isotherm models. The sorption kinetics was studied using the Lagergren pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The feasibility of the study was established from the thermodynamic studies. A surface area of 2.763 m2/g was obtained. The equilibrium and kinetics of sorption was best described by the Langmuir and the pseudo-second-order models, respectively. The sorption process was spontaneous (−ΔG0=28.72−31.77 kJ/mol) and endothermic in nature (ΔH0=17.45 kJ/mol). The positive value of ΔS0 (0.15 kJ/molK) implies increased randomness of the sorbate molecules at the surface of the sorbent. This study presents sustainable management of wastewater using MNS as a potential low-cost sorbent for dye decontamination from aqueous solution.

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Removal of acetaminophen (ACT) from aqueous solution by using nanosilica adsorbent: experimental study, kinetic and isotherm modeling

Pigment & Resin Technology ◽

10.1108/prt-06-2019-0057 ◽

2020 ◽

Vol 49 (1) ◽

pp. 55-62

Author(s):

Akbar Eslami ◽

Zahra Goodarzvand Chegini ◽

Maryam Khashij ◽

Mohammad Mehralian ◽

Marjan Hashemi

Keyword(s):

Removal Rate ◽

Synthesis Method ◽

Freundlich Isotherm ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Content Type ◽

Bet Analysis ◽

Pseudo Second Order

Purpose A nanosilica adsorbent was prepared and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and BET. Design/methodology/approach The optimum conditions for the highest adsorption performance were determined by kinetic modeling. The adsorbent was used for the adsorption of acetaminophen (ACT), and the parameters affecting the adsorption were discussed like pH, initial concentration, contact time and adsorbent dosage. The adsorbent have been characterized by SEM, XRD and BET analysis. The kinetic models including pseudo-first-order and pseudo-second-order with Langmuir and Freundlich isotherm models were applied to investigate the kinetic and isotherms parameters. Findings The adsorption of ACT increased to around 95% with the increase of nanosilica concentration to 30 g/L. Moreover, the adsorption process of ACT follows the pseudo-second-order kinetics and the Langmuir isotherm with the maximum adsorption capacity of 609 mg/g. Practical implications This study provided a simple and effective way to prepare of nanoadsorbents. This way was conductive to protect environmental and subsequent application for removal of emerging pollutants from aqueous solutions. Originality/value The novelty of the study is synthesizing the morphological and structural properties of nanosilica-based adsorbent (specific surface area, pore volume and size, shape and capability) and improving its removal rate through optimizing the synthesis method; and studying the capability of synthesis of nanosilica-based adsorbent for removal of ACT as a main emerging pharmaceutical water contaminant.

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Modified Spruce Sawdust for Sorption of Hexavalent Chromium in Batch Systems and Fixed-Bed Columns

Molecules ◽

10.3390/molecules25215156 ◽

2020 ◽

Vol 25 (21) ◽

pp. 5156

Author(s):

Dororthea Politi ◽

Dimitrios Sidiras

Keyword(s):

Sulfuric Acid ◽

Adsorption Capacity ◽

Hexavalent Chromium ◽

Diethylene Glycol ◽

Fixed Bed ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

Order Kinetic Model ◽

Pseudo Second Order

This study investigated the potential use of spruce sawdust that was pretreated with diethylene glycol and sulfuric acid for the removal of hexavalent chromium from wastewater. The sawdust pretreatment process was conducted at different temperatures and times. The adsorbent was characterized by quantitative saccharification, scanning electron microscopy, and Brunauer–Emmet–Teller surface area analysis. Adsorption capacity was studied for both batch and column processes. The experimental adsorption isotherms were simulated using seven isotherm models, including Freundlich and Langmuir models. By using the Langmuir isotherm model, the maximal Cr(VI) adsorption capacity of organosolv-pretreated spruce sawdust (qm) was 318.3 mg g−1. Furthermore, the kinetic data were fitted to Lagergren, pseudo-second-order, and intraparticle diffusion models, revealing that the adsorption of Cr(VI) onto spruce sawdust pretreated with diethylene glycol and sulfuric acid is best represented by the pseudo-second-order kinetic model. Three kinetic models, namely, the Bohart–Adams model, Thomas model, and modified dose–response (MDR) model, were used to fit the experimental data obtained from the column experiments and to resolve the characteristic parameters. The Thomas adsorption column capacity of the sawdust was increased from 2.44 to 31.1 mg g−1 upon pretreatment, thus, demonstrating that organosolv treatment enhances the adsorption capability of the material.

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Binary Isotherm Modeling for Simultaneous Desulfurization and Denitrogenation of Model Fuel by Zinc Loaded Activated Carbon

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2015-0216 ◽

2016 ◽

Vol 15 (3) ◽

Cited By ~ 2

Author(s):

Sandeep Kumar Thaligari ◽

Vimal Chandra Srivastava ◽

Basheswar Prasad

Keyword(s):

Activated Carbon ◽

Liquid Nitrogen ◽

Sulfur Compound ◽

Binary Solution ◽

Nitrogen Adsorption ◽

Isotherm Models ◽

Simultaneous Removal ◽

Nitrogenous Compound ◽

Isotherm Study ◽

Model Fuel

Abstract In the present study, simultaneous removal of the dibenzothiophene (an aromatic refractory sulfur compound) and quinoline (an aromatic refractory nitrogenous compound) from model fuel was performed using the zinc impregnated granular activated carbon (Zn-GAC). Textual properties of the adsorbent were determined by liquid nitrogen adsorption technique. Binary isotherm study revealed that the quinoline adsorption onto Zn-GAC was more favored in comparison to dibenzothiophene. Various multi-component isotherm models were used for representing the isotherm data from binary solution. Modified Redlich-Peterson model best represented the isotherm data.

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Parametric, equilibrium and kinetic studies on the removal of mercury using ion exchange resin

Water Practice & Technology ◽

10.2166/wpt.2017.037 ◽

2017 ◽

Vol 12 (2) ◽

pp. 305-313 ◽

Cited By ~ 2

Author(s):

N. Rajamohan ◽

M. Rajasimman

Keyword(s):

Freundlich Isotherm ◽

Kinetic Studies ◽

Strong Acid ◽

Ion Exchange Resin ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

Acid Cation ◽

Pseudo Second Order ◽

Langmuir Constants

This experimental research was an investigation into removal of mercury by using a strong acid cation resin, 001 × 7. Parametric experiments were conducted to determine the optimum pH, resin dosage, agitation speed and the effect of change in concentration in the range of 50–200 mg/L. High resin dosages favoured better removal efficiency but resulted in lower uptakes. Equilibrium experiments were performed and fitted to Langmuir and Freundlich isotherm models. Langmuir model suited well to this study confirming the homogeneity of the resin surface. The Langmuir constants were estimated as qmax = 110.619 mg/g and KL = 0.070 L/g at 308 K. Kinetic experiments were modeled using Pseudo second order model and higher values of R2 (>0.97) were obtained. The Pseudo second order kinetic constants, namely, equilibrium uptake (qe) and rate constant (k2), were evaluated as 59.17 mg/g and 40.2 × 10−4 g mg−1 min−1 at an initial mercury concentration of 100 mg/L and temperature of 308 K.

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