Fe3O4@C Matrix with Tailorable Adsorption Capacities for Paracetamol and Acetylsalicylic Acid: Synthesis, Characterization, and Kinetic Modeling

In this study Fe3O4@C matrix was obtained by combustion method and used hereafter as adsorbent for paracetamol and acetylsalicylic acid removal from aqueous solutions. The Fe3O4@C matrix was characterized by electronic microscopy, X-ray diffraction, thermal analysis, Fourier-transform infrared spectroscopy, and magnetic measurements. Two kinetic models of pseudo first-order and pseudo-second-order for both paracetamol and acetylsalicylic acid were studied. The experimental data were investigated by Langmuir, Freundlich, and Redlich–Peterson adsorption isotherm models. The adsorption followed the Redlich–Peterson and pseudo-second-order models with correlation coefficients R2 = 0.98593 and R2 = 0.99996, respectively, for the adsorption of paracetamol; for the acetylsalicylic acid, the adsorption followed the Freundlich and pseudo-second-order model, with correlation coefficients R2 = 0.99421 and R2 = 0.99977, respectively. The equilibrium was quickly reached after approximately 1h for the paracetamol adsorption and approximately 2h for acetylsalicylic acid adsorption. According to the Langmuir isotherm, the maximum adsorption capacity of the magnetic matrix was 142.01 mg·g−1 for the retention of paracetamol and 234.01 mg·g−1 for the retention of acetylsalicylic acid. The benefits of using the Fe3O4@C matrix are the low cost of synthesis and its easy and fast separation from solution by using an NdBFe magnet.

Download Full-text

Adsorptive Removal of Amido Black 10B from Aqueous Solution using Stem Carbon of Ricinus communis as Adsorbent

Asian Journal of Chemistry ◽

10.14233/ajchem.2019.21813 ◽

2019 ◽

Vol 31 (5) ◽

pp. 1071-1076

Author(s):

Rajvir Kaur ◽

Harpreet Kaur

Keyword(s):

Aqueous Solution ◽

Ricinus Communis ◽

Low Cost ◽

Correlation Coefficients ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Amido Black 10B ◽

Amido Black ◽

Langmuir Isotherm Model ◽

Pseudo Second Order

In the present work the efficiency of activated carbon made from stems of Ricinus communis (CRC) has been studied for removal of anionic dye- Amido black 10B from aqueous solution. The adsorbent has been characterized with scanning electron microscopy (SEM) and Fourier transformer infrared (FT-IR). The effects of various experimental parameters such as contact time, adsorbent dose, initial dye concentrations, pH, concentration of salt and temperature have been studied. Langmuir, Freundlich and Tempkin isotherm models have been used for describing the adsorption process. Of these, Langmuir isotherm model has best fitted the experimental data with a maximum adsorption capacity of 7.12 mg/g. Kinetics studies indicate that the adsorption of Amido black 10B has favoured toward pseudo-second-order model with high correlation coefficients. Thermodynamics parameters confirmed that the adsorption has been found to be spontaneous and endothermic in nature. These results suggested that CRC has a potential low-cost adsorbent for the removal of toxic dye Amido black 10B.

Download Full-text

Adsorption Kinetics for the Removal of Hazardous Dye Congo Red by Biowaste Materials as Adsorbents

Journal of Chemistry ◽

10.1155/2013/628582 ◽

2013 ◽

Vol 2013 ◽

pp. 1-12 ◽

Cited By ~ 51

Author(s):

Sumanjit Kaur ◽

Seema Rani ◽

Rakesh Kumar Mahajan

Keyword(s):

Congo Red ◽

Low Cost ◽

Correlation Coefficients ◽

Freundlich Isotherm ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Experimental Conditions ◽

Order Kinetic Model ◽

Pseudo Second Order

The present work aims to investigate the removal of dye congo red from aqueous solutions by two low-cost biowaste adsorbents such as ground nut shells charcoal (GNC) and eichhornia charcoal (EC) under various experimental conditions. The effect of contact time, ionic strength, temperature, pH, dye concentration, and adsorbent dose on the removal of dye was studied. The kinetic experimental data were fitted to pseudo-first order, pseudo-second order, intraparticle diffusion, Elovich model, and Bangham’s model. Results imply that adsorption of congo red on these adsorbents nicely followed the second order kinetic model and maximum adsorption capacity was found to be 117.6 and 56.8 mg g−1for GNC and EC at 318 K, however it increases with increase in temperature for both adsorbents. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Temkin, Dubinin and Radushkevich, and Generalized Isotherms. Freundlich isotherm described the isotherm data with high-correlation coefficients. The results of the present study substantiate that biowaste material GNC and EC are promising adsorbents for the removal of the dye congo red.

Download Full-text

Chromium (VI) Adsorption on Activated Lignin

Chemical Product and Process Modeling ◽

10.2202/1934-2659.1339 ◽

2009 ◽

Vol 4 (1) ◽

Cited By ~ 2

Author(s):

Nassima Tazerouti ◽

Moussa Amrani

Keyword(s):

Adsorption Isotherm ◽

Adsorption Capacity ◽

Contact Time ◽

Analytical Data ◽

Correlation Coefficients ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Chromium Vi ◽

Pseudo Second Order

Activated lignin, having a surface area of 1023 m2 g-1, has been prepared from lignin sulfate that was treated by 30% H2O2 and carbonized at 300°C in order to test the chromium (VI) adsorption from aqueous solution. The influence of contact time, pH, initial concentration of adsorbent and adsorbate and temperature on the adsorption capacity was investigated. The maximum removal of Cr(VI) was found to be 92.36% at pH=2 and a contact time of 80 min. Optimal concentration of lignin and Cr(VI) was found to be 3.8 gL-1 and 180mg L-1, respectively. The adsorption kinetics was examined with pseudo-first-order and pseudo-second-order equations. The analytical data fit well to the pseudo-second-order equation, and the rate of removal of chromium was found to speed up by increasing the temperature. Activation energy for the adsorption process was found to be 18.19 KJ mol-1. The Langmuir-Freundlich adsorption isotherm models were applied to describe the isotherm and its constants for the adsorption of Cr(VI) on lignin. These constants and correlation coefficients of the isotherm models were calculated and compared with each other. Results indicated that Cr(VI) uptake could be described by the Langmuir adsorption isotherm. The maximum adsorption capacity (qmax) of Cr(VI) on lignin was 75.75 mg g-1 at a temperature of 40°C. The dimensionless equilibrium parameter (RL) signified a favorable adsorption of Cr(VI) on lignin and was found to be between 0.0601 and 0.818 (0L<1). The thermodynamic parameters such as ?G°, ?S°, and ?H° were calculated and it has been found that the reaction was spontaneous and endothermic in nature. This study indicates that lignin has the potential to become an effective and economical adsorbent for the removal of Cr(VI) from waste water.

Download Full-text

Kinetics of lead ion biosorption from aqueous solution onto lyophilized Aspergillus niveus

Water Practice & Technology ◽

10.2166/wpt.2010.020 ◽

2010 ◽

Vol 5 (1) ◽

Cited By ~ 6

Author(s):

Hülya Karaca ◽

Turgay Tay ◽

Merih Kıvanç

Keyword(s):

Adsorption Capacity ◽

Correlation Coefficients ◽

Freundlich Isotherm ◽

Second Order ◽

Lead Ions ◽

Lead Ion ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Aspergillus Niveus ◽

Pseudo Second Order

The biosorption of lead ions (Pb2+) onto lyophilized fungus Aspergillus niveus was investigated in aqueous solutions in a batch system with respect to pH, contact time and initial concentration of the ions at 30 °C. The maximum adsorption capacity of lyophilized A. niveus was found to be 92.6 mg g−1 at pH 5.1 and the biosorption equilibrium was established about in 30 min. The adsorption capacity obtained is one of the highest value among those reported in the literature. The kinetic data were analyzed using the pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion equations. Kinetic parameters, such as rate constants, equilibrium adsorption capacities, and related correlation coefficients for the kinetic models were calculated and discussed. It was found that the adsorption of lead ions onto lyophilized A. niveus biomass fit the pseudo-second-order kinetic model well. The Langmuir and Freundlich isotherm parameters for the lead ion adsorption were applied and the Langmuir model agreed better with the adsorption of lead ions onto lyophilized A. niveus.

Download Full-text

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.

Download Full-text

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.

Download Full-text

Adsorption of heavy metals from aqueous solutions by Mg–Al–Zn mingled oxides adsorbent

Water Science & Technology ◽

10.2166/wst.2016.329 ◽

2016 ◽

Vol 74 (7) ◽

pp. 1644-1657 ◽

Cited By ~ 8

Author(s):

Mona El-Sayed ◽

Gh. Eshaq ◽

A. E. ElMetwally

Keyword(s):

Heavy Metals ◽

Metal Ion ◽

Second Order ◽

Ion Concentration ◽

Precipitation Method ◽

Isotherm Models ◽

Infrared Spectrometry ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Pseudo Second Order

In our study, Mg–Al–Zn mingled oxides were prepared by the co-precipitation method. The structure, composition, morphology and thermal stability of the synthesized Mg–Al–Zn mingled oxides were analyzed by powder X-ray diffraction, Fourier transform infrared spectrometry, N2 physisorption, scanning electron microscopy, differential scanning calorimetry and thermogravimetry. Batch experiments were performed to study the adsorption behavior of cobalt(II) and nickel(II) as a function of pH, contact time, initial metal ion concentration, and adsorbent dose. The maximum adsorption capacity of Mg–Al–Zn mingled oxides for cobalt and nickel metal ions was 116.7 mg g−1, and 70.4 mg g−1, respectively. The experimental data were analyzed using pseudo-first- and pseudo-second-order kinetic models in linear and nonlinear regression analysis. The kinetic studies showed that the adsorption process could be described by the pseudo-second-order kinetic model. Experimental equilibrium data were well represented by Langmuir and Freundlich isotherm models. Also, the maximum monolayer capacity, qmax, obtained was 113.8 mg g−1, and 79.4 mg g−1 for Co(II), and Ni(II), respectively. Our results showed that Mg–Al–Zn mingled oxides can be used as an efficient adsorbent material for removal of heavy metals from industrial wastewater samples.

Download Full-text

Simultaneous Adsorption of Cr(VI) and Phenol from Binary Mixture Using Iron Incorporated Rice Husk: Insight to Multicomponent Equilibrium Isotherm

International Journal of Chemical Engineering ◽

10.1155/2016/7086761 ◽

2016 ◽

Vol 2016 ◽

pp. 1-11 ◽

Cited By ~ 4

Author(s):

Ankur Gupta ◽

Chandrajit Balomajumder

Keyword(s):

Experimental Data ◽

Rice Husk ◽

Low Cost ◽

Binary Solution ◽

Multicomponent System ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Model ◽

Adsorption Isotherm Models ◽

Pseudo Second Order

Fe modified rice husk was prepared as a low cost biosorbent for the removal of Cr(VI) and phenol both singly and in combination from single and binary simulated synthetic waste water. Rice husk was modified by treating with FeSO4·7H2O. The results showed that impregnation of iron onto the surface of rice husk improved the adsorption capability of both Cr(VI) and phenol. The effects of process parameters for multicomponent system such as pH, adsorbent dose, and contact time onto the percentage removal of both Cr(VI) and phenol were investigated. The experimental data for the adsorption of both Cr(VI) and phenol onto the surface of Fe modified rice husk applied to various kinetic and adsorption isotherm models. Multicomponent isotherm models such as Nonmodified Langmuir, Modified Langmuir, Extended Langmuir, Extended Freundlich, Competitive Nonmodified Redlich Peterson, Competitive Modified Redlich Peterson were applied. The results show that Extended Freundlich model best described the experimental data for both Cr(VI) and phenol from binary solution. Pseudo second-order model agreed well with Cr(VI) while pseudo first-order model agreed well with phenol. Maximum adsorption capacity in synthetic binary solution of Cr(VI) and phenol was found to be 36.3817 mg g−1for Cr(VI) and 6.569 mg g−1for phenol, respectively.

Download Full-text

Equilibrium, kinetic and thermodynamic studies of mercury adsorption on almond shell

Water Science & Technology ◽

10.2166/wst.2012.767 ◽

2012 ◽

Vol 65 (8) ◽

pp. 1341-1349 ◽

Cited By ~ 12

Author(s):

Shokooh Sadat Khaloo ◽

Amir Hossein Matin ◽

Sahar Sharifi ◽

Masoumeh Fadaeinia ◽

Narges Kazempour ◽

...

Keyword(s):

Adsorption Capacity ◽

Low Cost ◽

Second Order ◽

Ion Concentration ◽

Physical Parameters ◽

Maximum Adsorption Capacity ◽

Almond Shell ◽

Pseudo Second Order ◽

Uptake Process ◽

Reaction Equations

The application of almond shell as a low cost natural adsorbent to remove Hg2+ from aqueous solution was investigated. Batch experiments were carried out to evaluate the adsorption capacity of the material. The chemical and physical parameters such as pH, sorbent amount, initial ion concentration, and contact time were optimized for the maximum uptake of mercury onto the solid surface. Adsorption isotherms were expressed by Langmuir and Freundlich adsorption models, and the experimental data were found to fit the Langmuir model rather than the Freundlich. The maximum adsorption capacity obtained from the Langmuir isotherm was 135.13 mg/g. A kinetic study was carried out with pseudo-first-order and pseudo-second-order reaction equations and it was found that the Hg2+ uptake process followed the pseudo-second-order rate expression. The thermodynamic values, ΔG0, ΔH0 and ΔS0, indicated that adsorption was an endothermic and spontaneous process. The potential of this material for mercury elimination was demonstrated by efficient Hg2+ removal from a synthetic effluent.

Download Full-text

A Study of The Equilibrium, Kinetics, and Thermodynamics of Malachite Green Dye Adsorption Onto Lignin

10.21203/rs.3.rs-1009760/v1 ◽

2021 ◽

Author(s):

Vani Gandham ◽

UMA Addepally ◽

Bala Narsaiah T

Keyword(s):

Malachite Green ◽

Group Analysis ◽

Dye Adsorption ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adequate Treatment ◽

Pseudo Second Order ◽

Kinetics And Isotherms

Abstract Malachite Green (MG), a cationic synthetic dye is considered hazardous when discharged into the water bodies without any adequate treatment. It can affect the multiple segments of the environment leading to irreversible persistent changes. So, there is a need for remediation with cost-effective method to remove dyes from effluents. Adsorption is one such technique to remove dyes from wastewater and is effective and economical. The present study describes the removal of MG cationic dye from wastewater using eco-friendly and biodegradable lignin extracted from hydrothermally treated rice straw by adsorption process. Functional group analysis and morphological characterisation was done to the extracted lignin after quantification. The maximum percent removal of MG 92 ± 0.2 % was observed from a series of batch experiments at optimum process parameters of: contact time 80 min, initial dye concentration 50 ppm, lignin dosage 0.25g, pH 7, temperature 300c and with 100 rpm agitation speed. The adsorption kinetics and isotherms were determined for the experimental data using four kinetic models (pseudo-first-order, second order, pseudo-second-order and intra-particle diffusion model) and two isotherm models (Langmuir and Freundlich). The results suggested that the kinetics data fit to the pseudo-second-order kinetic model with the maximum adsorption capacity 36.7 mg/g and the two isotherm models were applicable for the adsorption of MG onto the lignin. Additionally, the thermodynamic parameters ΔSo, ΔHo and ΔGo were evaluated. Therefore, lignin which is an environmental friendly and low cost carbon material that can be used as an adsorbent for dye removal.

Download Full-text