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Recent Advances of Adsorbents: Materials, Characterization, Applications, Kinetics and Equilibrium Models

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 3462

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Dear Colleagues,

Adsorbents are compounds of substantial interest in interdisciplinary fields of science encompassing chemistry, physics, biology, environmental, and other areas. Among the different types of materials, adsorbents are the most stable, with several practical applications. They are also crucial for environmental applications owing to their suitability for pollutant removal, and adsorption may be used in a variety of other applications to incorporate solutes into materials. In addition, several characterization techniques are used to characterize adsorbents, mainly surface characterization techniques, which are also of interest in this volume. The kinetic and equilibrium models have also been widely used in recent papers on adsorption, as have the various ways of using and demonstrating them, whether with the help of software or new applications, which have also recently attracted attention.

The topics of interest in this Special Issue include but are not limited to:

Types of adsorbents;
Preparation, properties, and applications of adsorbents;
Advanced characterization techniques for adsorbents;
Functionalized of adsorbents;
Environmental applications of adsorbents;
Other applications of adsorbents;
Kinetics models;
Equilibrium models;
Software and applications for adsorption.

Dr. Edson C. Silva-Fiho
Dr. Josy Anteveli Osajima
Dr. Bartolomeu Cruz Viana
Dr. Roosevelt Delano de Sousa Bezerra
Guest Editors

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Keywords

adsorption
adsorbents
environmental remediation
characterization
applications
kinetic models
equilibrium models
software
application

Published Papers (2 papers)

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Research

12 pages, 2354 KiB

Open AccessArticle

Biochar Obtained from Caryocar brasiliense Endocarp for Removal of Dyes from the Aqueous Medium

by André L. F. C. Melo, Marcelo T. Carneiro, Ariane M. S. S. Nascimento, Alan I. S. Morais, Roosevelt D. S. Bezerra, Bartolomeu C. Viana, Josy A. Osajima and Edson C. Silva-Filho

Materials 2022, 15(24), 9076; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15249076 - 19 Dec 2022

Cited by 3 | Viewed by 1692

Abstract

Given the increase in environmental pollution, especially of water, the emergence of studies that seek to develop strategies to mitigate/treat such effects have gained prominence in the world scientific community. Among the numerous adsorption processes, those made from biochar production stand out. This study analyzed the adsorption properties of the blue methylene model dye in the aqueous solution of biochar and activated biochar developed from pequi (Caryocar brasiliense) endocarp. The biochar was characterized, before and after adsorption, by infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and thermogravimetric analysis (TG). The surface load of the materials was performed by the point of zero charge (pH_PZC) method. The study also included analyses of contact time parameters and adsorbed concentration in the adsorption process. Morphological analysis showed that a more significant and profound number of fissures and pores appeared in the activated biochar compared to the biochar. Residual mass analysis evidenced that biochar lost about 15% more mass than the activated biochar, indicating that activation occurred satisfactorily. The adsorption process was well adjusted by pseudo-second-order kinetics and Langmuir’s isothermal model. The activated biochar achieved an excellent adsorption capacity of 476.19 mg.g⁻¹, thus demonstrating to be a sound system for removing dyes from an aqueous medium. Full article

(This article belongs to the Special Issue Recent Advances of Adsorbents: Materials, Characterization, Applications, Kinetics and Equilibrium Models)

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14 pages, 6153 KiB

Open AccessEditor’s ChoiceArticle

Amino-Functionalized Titanate Nanotubes: pH and Kinetic Study of a Promising Adsorbent for Acid Dye in Aqueous Solution

by Débora A. Sales, Paloma N. S. Lima, Lucinaldo S. Silva, Thalles M. F. Marques, Suziete B. S. Gusmão, Odair P. Ferreira, Anupama Ghosh, Yuset Guerra, Alan Í. S. Morais, Roosevelt D. S. Bezerra, Edson C. Silva-Filho and Bartolomeu C. Viana

Materials 2022, 15(18), 6393; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15186393 - 15 Sep 2022

Cited by 1 | Viewed by 1417

Abstract

This work reports the functionalization of sodium titanate nanotubes with amine groups obtained from the reaction of titanate nanotubes with [3-(2-Aminoethylamino)propyl]trimethoxysilane, NaTiNT−2NH, and 3-[2-(2-Aminoethylamino)ethylamino]propyltrimethoxysilane, NaTiNT−3NH. It was verified that the crystalline and morphological structures of NaTiNT were preserved after the functionalization, spectroscopies showed that aminosilane interacted covalently with the surface of NaTiNT, and the incorporation of the aminosilane groups on the surface of NaTiNT can be confirmed. The adsorbent matrices NaTiNT−2NH and NaTiNT−3NH were used to remove the anionic dye from remazol blue R (RB) in aqueous medium, and the highest adsorption capacity was around 365.84 mg g

^{- 1}

(NaTiNT−2NH) and 440.70 mg g

^{- 1}

(NaTiNT−3NH) in the range of pH 5.0 to 10.0 and the equilibrium time was reached in 210 min (NaTiNT−2NH) and 270 min (NaTiNT−3NH). Furthermore, the Elovich model, which reports the adsorption in heterogeneous sites and with different activation energies in the chemisorption process, was the most appropriate to describe the adsorption kinetics. Thus, these adsorbent matrices can be used as an alternative potential for dye removal RB in aqueous solution. Full article

(This article belongs to the Special Issue Recent Advances of Adsorbents: Materials, Characterization, Applications, Kinetics and Equilibrium Models)

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