Preparation and Characterization of Fe3O4@nSiO2@mSiO2–NH2 Core–Shell Microspheres for Extracting Allura Red from Aqueous Solution

Allura red (AR) is a water-soluble synthetic colorant often used as an additive in the food industry, but excess AR can be harmful to human health. In this work, we report the development of a new removal method for AR by using amino-functionalized microspheres with Fe3O4 cores and twolayer shells composed of SiO2 particles and perpendicularly aligned mesoporous SiO2 (designated Fe3O4@nSiO2@mSiO2–NH2). The material exhibits good dispersibility in aqueous solutions and a high saturation magnetization of 45.68[Formula: see text]emu[Formula: see text]g[Formula: see text], and can be magnetically separated efficiently with an external magnet. Importantly, the material has great adsorption capacity of 29.6[Formula: see text]mg[Formula: see text]g[Formula: see text] for AR and the capacity for reuse with a simple treatment. The adsorption process is very fast and the kinetics data are consistent with a pseudo-second order model. Based on these, a rapid and efficient method for extraction and analysis of AR in water and soft drinks has been established.

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Application of Biochar to the Remediation of Pb-Contaminated Solutions

Sustainability ◽

10.3390/su10124440 ◽

2018 ◽

Vol 10 (12) ◽

pp. 4440 ◽

Cited By ~ 8

Author(s):

Maria Boni ◽

Agostina Chiavola ◽

Simone Marzeddu

Keyword(s):

Adsorption Process ◽

Chemical Characterization ◽

Complete Removal ◽

Order Model ◽

Equilibrium Conditions ◽

Sem Images ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Physical And Chemical

BIOTON® biochar, produced by a wood biomass pyrolysis process, which is usually applied as soil amendment, was investigated for a novel application, i.e., the adsorption of lead from contaminated solutions. The experimental activity included physical and chemical characterization of BIOTON®; and Scanning Electron Microscope (SEM) images to highlight its internal structure. The adsorption process was investigated through batch and column experiments. Adsorption kinetics showed very rapid achievement of equilibrium conditions, i.e., 50 mg/L and 100 mg/L initial Pb concentration at 2 h and 4 h, respectively. Complete removal also occurred within the same time. The Brunauer–Emmett–Teller model was a better fit for the equilibrium data of both Pb concentrations, whereas the kinetics were best represented by the pseudo second-order model. Column tests showed that the addition of biochar as an adsorbent media within the bed significantly extended the time of breakthrough and exhaustion, with respect to the column filled with soil only. The values found for the adsorption capacity of BIOTON®- versus lead-containing solutions were comparable to those reported for commercial adsorbents. Therefore, BIOTON® can be considered a valid option: It also offers the additional benefit of allowing the recovery of a residue, which alternately would need to be disposed of.

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Application of Biochar to the Remediation of Pb-Contaminated Solutions

10.20944/preprints201810.0730.v1 ◽

2018 ◽

Author(s):

Maria Rosaria Boni ◽

Agostina Chiavola ◽

Simone Marzeddu

Keyword(s):

Adsorption Process ◽

Chemical Characterization ◽

Complete Removal ◽

Order Model ◽

Equilibrium Conditions ◽

Sem Images ◽

Adsorption Capacities ◽

Equilibrium Data ◽

Pseudo Second Order

The BIOTON® biochar, produced by a wood biomass pyrolysis process, usually applied as a soil amendment, was investigated for a novel application, i.e. the adsorption of lead from contaminated solutions. The experimental activity firstly included the physical-chemical characterization of BIOTON®; SEM images were also obtained to highlight its internal structure. The adsorption process was investigated through batch and column experiments. Adsorption kinetics showed a very rapid achievement of the equilibrium conditions, i.e. at 2h and 4h for 50 mg/L and 100 mg/L initial Pb concentration, respectively. Complete removal also occurred within the same time. The Brunauer–Emmett–Teller model better fitted the equilibrium data for both Pb concentrations, whereas the kinetics were best represented by the pseudo second order model. The column tests showed that the addition of biochar as adsorbent media within the bed significantly extended the time of breakthrough and exhaustion, with respect to the column filled with soil only. The adsorption capacities of BIOTON® versus lead solutions was found to be comparable to that reported for commercial adsorbents. Therefore, BIOTON® can be considered a valid option, with the additional benefit to reduce the environmental impact since allows to recover a residue which alternately would need to be disposed of.

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Synthesis, characterization and adsorption capacity of lead(II) ions of Fe3O4/C core-shell structure materials

Vietnam Journal of Catalysis and Adsorption ◽

10.51316/jca.2021.026 ◽

2021 ◽

Vol 10 (2) ◽

pp. 43-48

Author(s):

Dang Le Hai ◽

Trang Luu Thu ◽

Hoang Tran Vinh ◽

Doanh Vu Viet ◽

Thu Le Dieu ◽

...

Keyword(s):

Aqueous Solution ◽

Magnetite Nanoparticles ◽

Shell Structure ◽

Adsorption Process ◽

Langmuir Model ◽

Core Shell ◽

Order Model ◽

Pseudo Second Order ◽

Core Shell Structure ◽

Model Expression

Core shell magnetite nanoparticles (Fe3O4@C) as adsorbent for lead ions from aqueous solution were synthesized. The characteristics of the modified materials were analysed. It could also be shown that the adsorption isotherms were well described by the Langmuir model. The kinetic of the adsorption process was found to follow the pseudo-second-order model expression. Thermodynamic studies indicated that the adsorption process was feasible, spontaneous and endothermic.

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Kinetics and Thermodynamics of Adsorption of Fluorides by ZeoSonNaFe

MRS Advances ◽

10.1557/adv.2019.469 ◽

2019 ◽

Vol 4 (59-60) ◽

pp. 3215-3221

Author(s):

Jessica López-Castillo ◽

G. Macedo-Miranda ◽

S. Martínez-Gallegos ◽

E. Ordoñez ◽

J. Illescas ◽

...

Keyword(s):

Adsorption Process ◽

Maximum Adsorption Capacity ◽

Significant Modification ◽

Order Model ◽

Fluoride Solution ◽

Kinetics And Thermodynamics ◽

Pseudo Second Order ◽

Best Fit

Abstract:The present study investigated the adsorption of fluorides in natural zeolites clinoptilolite-type, sourced in Sonora, Mexico, and modified with Fe. Characterization of the material was carried out along with determination of kinetic parameters varying time and concentration of reagents to calculate maximum adsorption capacity. To determine thermodynamic parameters temperature was varied for accurate characterization of the adsorption process. It was found that the zeolite fixed Fe in its structure without model significant modification, likewise when put in contact with a fluoride solution (F-), it was capable of taking up these ions through adsorption due to the interaction between the sorbato and the pollutant. The kinetics best fit Pseudo-second-order model with Qmax=0.91 mgg-1, therefore it indicates that the process is reversible, spontaneous and endothermic what can favor the reuse of the material.

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Study on the Formaldehyde Adsorption Kinetics of Dry Waters

Materials Science Forum ◽

10.4028/www.scientific.net/msf.809-810.907 ◽

2014 ◽

Vol 809-810 ◽

pp. 907-911

Author(s):

Jun Long Wang ◽

Jie Hou ◽

Ting Jiang ◽

Yong Jun He ◽

Yao Dong Liang

Keyword(s):

Adsorption Kinetics ◽

High Speed ◽

Adsorption Process ◽

Average Diameter ◽

Adsorption Rate ◽

Absorption Kinetics ◽

Order Model ◽

Pseudo Second Order ◽

Kinetics Of ◽

Formaldehyde Adsorption

Dry waters with an average diameter of 82 μm were prepared by a high speed mixed route. The formaldehyde absorption kinetics of dry waters was investigated by simulating indoor formaldehyde pollution in glass chamber. The results showed that pseudo-second order model could be used to simulate the adsorption process; the adsorption rate was highest in the initial 60 minutes; when the adsorption lasted for 180 minutes, the adsorption reached equilibrium.

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ADSORPTION AND KINETIC STUDIES OF A NATURAL DYE FROM CURCUMA LONGA L., ONTO BAMBOO YARN

Journal of Chemical Engineering and Industrial Biotechnology ◽

10.15282/jceib.v2i1.3802 ◽

2017 ◽

Vol 2 (1) ◽

pp. 13-26

Author(s):

Tengku Khamanur Azma Tg. Mohd Zamri ◽

Mimi Sakinah Abd Munaim ◽

Zularisam Ab Wahid

Keyword(s):

Adsorption Process ◽

Regression Coefficient ◽

Curcuma Longa ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Natural Dye ◽

Isotherm Models ◽

Order Model ◽

Dyeing Process ◽

Pseudo Second Order

Natural dye extracted from the rhizome of Curcuma longa L. were applied to bamboo yarns using exhaustion dyeing process. This study investigates the dyeing behaviour of Curcumin; the major color component isolated from rhizomes of Curcuma longa L.on bamboo yarn. Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models were used to test the adsorption process of curcumin on bamboo yarn. Comparison of regression coefficient value indicated that the Freundlich isotherm most fitted to the adsorption of curcumin onto bamboo yarn. Furthermore, the kinetics study on this research fitted the pseudo-second order model which indicates that the basis of interaction was chemical adsorption.

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Equilibrium and Kinetic Study of Lead and Copper Ion Adsorption on Chitosan-Grafted-Polyacrylic Acid Synthesized by Surface Initiated Atomic Transfer Polymerization

Molecules ◽

10.3390/molecules23092218 ◽

2018 ◽

Vol 23 (9) ◽

pp. 2218 ◽

Cited By ~ 6

Author(s):

Carlos Grande-Tovar ◽

William Vallejo ◽

Fabio Zuluaga

Keyword(s):

Adsorption Capacity ◽

Polyacrylic Acid ◽

Adsorption Process ◽

Kinetic Constant ◽

Copper Ion ◽

Toxic Metal ◽

Maximum Adsorption Capacity ◽

Order Model ◽

Equilibrium Studies ◽

Pseudo Second Order

In this work, we synthesized chitosan grafted-polyacrylic acid (CS-g-PA) through surface-initiated atom transfer radical polymerization (SI-ATRP). We also studied the adsorption process of copper and lead ions onto the CS-g-PA surface. Adsorption equilibrium studies indicated that pH 4.0 was the best pH for the adsorption process and the maximum adsorption capacity over CS-g-PA for Pb2+ ions was 98 mg·g−1 and for Cu2+ it was 164 mg·g−1, while for chitosan alone (CS), the Pb2+ adsorption capacity was only 14.8 mg·g−1 and for Cu2+ it was 140 mg·g−1. Furthermore, the adsorption studies indicated that Langmuir model describes all the experimental data and besides, pseudo-second-order model was suitable to describe kinetic results for the adsorption process, demonstrating a larger kinetic constant of the process was larger for Pb2+ than Cu2+. Compared to other adsorbents reported, CS-g-PA had comparable or even superior adsorbent capacity and besides, all these results suggest that the new CS-g-PA polymers had potential as an adsorbent for hazardous and toxic metal ions produced by different industries.

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Synthesis Fe3O4/Talc nanocomposite by coprecipition-ultrasonication method and advances in hexavalent chromium removal from aqueous solution

Adsorption Science & Technology ◽

10.1177/0263617420969112 ◽

2020 ◽

Vol 38 (9-10) ◽

pp. 483-501

Author(s):

Nguyen Thi Huong ◽

Nguyen Ngoc Son ◽

Vo Hoang Phuong ◽

Cong Tien Dung ◽

Pham Thi Mai Huong ◽

...

Keyword(s):

Aqueous Solution ◽

Adsorption Process ◽

Low Cost ◽

Batch Experiments ◽

X Ray Diffraction ◽

Order Model ◽

X Ray ◽

Pseudo Second Order ◽

Ft Ir ◽

Langmuir And Freundlich Equations

The Fe3O4/Talc nanocomposite was synthesized by the coprecipitation-ultrasonication method. The reaction was carried out under a inert gas environment. The nanoparticles were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), fourier-transform infrared spectroscopy (FT-IR) and vibrating sample magnetometry techniques (VSM), the surface area of the nanoparticles was determined to be 77.92 m2/g by Brunauer-Emmett-Teller method (BET). The kinetic data showed that the adsorption process fitted with the pseudo-second order model. Batch experiments were carried out to determine the adsorption kinetics and mechanisms of Cr(VI) by Fe3O4/Talc nanocomposite. The adsorption process was found to be highly pH-dependent, which made the material selectively adsorb these metals from aqueous solution. The isotherms of adsorption were also studied using Langmuir and Freundlich equations in linear forms. It is found that the Langmuir equation showed better linear correlation with the experimental data than the Freundlich. The thermodynamics of Cr(VI) adsorption onto the Fe3O4/Talc nanocomposite indicated that the adsorption was exothermic. The reusability study has proven that Fe3O4/Talc nanocomposite can be employed as a low-cost and easy to separate.

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Fluoride ion adsorption from wastewater using magnesium(II), aluminum(III) and titanium(IV) modified natural zeolite: kinetics, thermodynamics, and mechanistic aspects of adsorption

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2017.037 ◽

2017 ◽

Vol 8 (4) ◽

pp. 479-489 ◽

Cited By ~ 11

Author(s):

Zhijun Ma ◽

Qi Zhang ◽

Xingyuan Weng ◽

Changye Mang ◽

Liwei Si ◽

...

Keyword(s):

Natural Zeolite ◽

Adsorption Process ◽

Fluoride Ion ◽

Ion Adsorption ◽

Order Model ◽

Fluoride Ions ◽

Modified Zeolite ◽

Fluoride Adsorption ◽

Pseudo Second Order ◽

Modified Zeolites

Abstract Natural zeolite was modified using metal ions, including magnesium(II), aluminum(III) and titanium(IV). The modified zeolite was then used as an adsorbent for the investigation of the adsorption kinetics, isotherms, and thermodynamic parameters of fluoride ions in wastewater at various pHs and temperatures. The kinetics and thermodynamics for the removal of the fluoride ions onto the modified zeolite have also been investigated. The fluoride ion adsorption capacity of the three types of modified zeolites exhibited an increase, then decrease, with rising pH. The fluoride adsorption capacity of the modified zeolites decreased with an increase in temperature. The pseudo-second-order model is more suitable for describing the adsorption kinetic data than the pseudo-first-order model for modified zeolite and the adsorption process of the fluoride ions reveals pseudo-second-order kinetic behavior, respectively. It was found that the adsorption equilibrium data fit the Freundlich isothermal equation better than that of the Langmuir isothermal and Dubinin–Radushkevich (D–R) isothermal equations. Thermodynamic analysis suggests that the negative values of ΔG0 and ΔH0 further indicate that the fluoride adsorption process is both spontaneous and exothermic. The results of competitive adsorption tests suggest that the modified metal zeolite materials adsorb fluoride ions with high selectivity.

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Preparation of bio-based magnetic adsorbent and application for efficient removal of Cd(II) from water

Water Science & Technology ◽

10.2166/wst.2018.007 ◽

2018 ◽

Vol 77 (5) ◽

pp. 1313-1323 ◽

Cited By ~ 1

Author(s):

Jianjun Zhou ◽

Xionghui Ji ◽

Xiaohui Zhou ◽

Jialin Ren ◽

Yaochi Liu

Keyword(s):

Aqueous Solution ◽

Adsorption Process ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

Magnetic Adsorbent ◽

Order Model ◽

Efficient Removal ◽

Adsorption Ability ◽

Adsorption Sites ◽

Pseudo Second Order

Abstract A novel magnetic bio-adsorbent (MCIA) was developed, characterized and tested for its Cd(II) removal from aqueous solution. MCIA could be easily separated from the solution after equilibrium adsorption due to its super-paramagnetic property. The functional and magnetic bio-material was an attractive adsorbent for the removal of Cd(II) from aqueous solution owing to the abundant adsorption sites, amino-group and oxygen-containing groups on the surface of Cyclosorus interruptus. The experimental results indicated that the MCIA exhibited excellent adsorption ability and the adsorption process was spontaneous and endothermic. The adsorption isotherm was consistent with the Langmuir model. The adsorption kinetic fitted the pseudo-second-order model very well. The maximum adsorption capacity of Cd(II) onto MCIA was 40.8, 49.4, 54.6 and 56.6 mg/g at 293, 303, 313 and 323 K, respectively. And the MCIA exhibited an excellent reusability and impressive regeneration. Therefore, MCIA could serve as a sustainable, efficient and low-cost magnetic adsorbent for Cd(II) removal from aqueous solution.

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