molecules-logo

Journal Browser

Journal Browser

Novel Adsorbents for Environmental Pollutants' Removal

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Applied Chemistry".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 2851

Special Issue Editor


E-Mail Website
Guest Editor
Hai Yun Feng Jing, 55 Qingshan Road, Qingzhen, Guiyang, China
Interests: novel adsorbents; environmental pollutants removal; synthesis and self-assembly; characterization; low dimensional carbon based nanocomposites; metal-organic framework derived nanohybrids; adsorption isotherm; adsorption thermodynamics and kinetics; applications of artificial intelligence and molecular modeling

Special Issue Information

Dear Colleagues,

This Special Issue invites the submission of original research articles and critical reviews relating to novel adsorbents for the removal of environmental pollutants. Environmental pollution is one of the most imminent dangers and challenges humanity currently faces, and adsorption is one of the most efficient ways for removing the pollutants. The present Special Issue is focused on potentially effective adsorbents for the removal of environmental pollutants including persistent organic pollutants, heavy metals, polyaromatic hydrocarbons, nitrogen and phosphorus nutrients, hazardous dyes, toxic surfactants, pharmaceuticals and personal care products, phthalate esters, toxic gases, and greenhouse gases. Novel adsorbents, e.g., low-dimensional carbon-based nanocomposites and metal–organic framework-derived nanohybrids in combination with traditional adsorbents, such as silica gel, activated carbon and alumina, zeolite and polymers, can be designed, fabricated via synthesis, surface modification or self-assembly, and characterized using various methods, e.g., scanning electron microscopy, transmission electron microscopy, scanning probe microscopy, X-ray diffraction, nitrogen adsorption, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, infrared/Raman spectroscopy, synchrotron-based near-edge X-ray absorption fine structure spectroscopy, spallation neutron source, spherical aberration correction high-resolution scanning transmission microscopy, and atomic probe tomography. Close attention should be paid to the study of surface and interface properties, pore size and shape, and the active sites of these adsorbents.

Pollutants removal processes via adsorption can be described and evaluated with adsorption isotherms, thermodynamics and kinetics with the aid of linear or non-linear model-fitting techniques. With regard to adsorption mechanisms, physical or chemical adsorption, selectivity, and monolayer or multilayer modes should be clarified. In addition, the regeneration and recovery processes of adsorbents should be carefully taken into consideration. In connection with experimental design approaches (such as response surface methodology, and orthogonal design), cutting-edge artificial intelligence tools, e.g., back-propagation neural network, fuzzy neural network, genetic algorithm, particle swarm optimization, decision tree, convolutional neural networks (deep learning), and generative large models, are highly promising technologies to facilitate the study of adsorptive processes and their optimization. Quantum mechanics, molecular dynamics and Monte Carlo simulation are also useful methods for modeling the interactions between adsorbent and adsorbate molecules.

Studies exploring novel adsorbents from renewable resources and with magnetic properties useful for solid–liquid separation are especially welcomed. These can significantly cut the cost of adsorbents and reduce the energy consumed in adsorptive processes, thus conforming to the current theme of green development. In addition, scale-up applications based on laboratory results are encouraged in order to push forward the practical uses of newly developed adsorbents to tackle the increasingly pressing issue of environmental pollution.

Prof. Dr. Jiwei Hu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • novel adsorbents
  • environmental pollutants removal
  • synthesis and self-assembly
  • characterization
  • low dimensional carbon-based nanocomposites
  • metal-organic framework-derived nanohybrids
  • adsorption isotherm
  • adsorption thermodynamics and kinetics
  • applications of artificial intelligence and molecular modeling

Published Papers (3 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

14 pages, 2866 KiB  
Article
Fabrication of an Fe-Doped ZIF-67 Derived Magnetic Fe/Co/C Composite for Effective Removal of Congo Red
by Yu Cao, Zeming Dai, Xuan Zhou, Yuting Lin and Jianhua Hou
Molecules 2024, 29(9), 2078; https://doi.org/10.3390/molecules29092078 - 30 Apr 2024
Viewed by 415
Abstract
The dyes in printing and dyeing wastewater are harmful to the human body and the environment. It is essential to develop practical and effective adsorbents to deal with them. In this study, an Fe-doped, ZIF-67 derived Fe/Co/C composite material with strong magnetism was [...] Read more.
The dyes in printing and dyeing wastewater are harmful to the human body and the environment. It is essential to develop practical and effective adsorbents to deal with them. In this study, an Fe-doped, ZIF-67 derived Fe/Co/C composite material with strong magnetism was successfully synthesized. The effects of pH, initial concentration, and adsorption time on the properties of the adsorbent were investigated. To further improve the removal efficiency and enhance the practicality, potassium peroxymonosulfate (PMS) was added to the system due to its Fenton-like effect. Then, an Fe/Co/C composite was used with PMS to remove Congo red (CR) with a 98% removal of 250 mg·L−1. Moreover, for its high saturation magnetization of 85.4 emu·g−1, the Fe/Co/C composite can be easily recovered by applying a magnetic field, solving the problem that powdery functional materials are difficult to recover and, thus, avoiding secondary pollution. Furthermore, since the composite material was doped before carbonization, this synthetic strategy is flexible and the required metal elements can be added at will to achieve different purposes. This study demonstrates that this Fe-doped, ZIF-67 derived magnetic material has potential application prospects for dye adsorption. Full article
(This article belongs to the Special Issue Novel Adsorbents for Environmental Pollutants' Removal)
Show Figures

Graphical abstract

15 pages, 2875 KiB  
Article
Orientation Growth of N-Doped and Iron-Based Metal–Organic Framework and Its Application for Removal of Cr(VI) in Wastewater
by Yan Chen, Chao Lei, Yong-Gang Zhao, Ming-Li Ye and Kun Yang
Molecules 2024, 29(5), 1007; https://doi.org/10.3390/molecules29051007 - 26 Feb 2024
Viewed by 819
Abstract
A series of NH2-functionalized nano-sized magnetic metal–organic frameworks (MOFs) were prepared in this study for Cr(VI) removal from wastewater. It was observed that not only the morphological, i.e., orientation growth of N-doped and iron-based metal–organic frameworks, but also the adsorption of [...] Read more.
A series of NH2-functionalized nano-sized magnetic metal–organic frameworks (MOFs) were prepared in this study for Cr(VI) removal from wastewater. It was observed that not only the morphological, i.e., orientation growth of N-doped and iron-based metal–organic frameworks, but also the adsorption of magnetic MOFs is largely related to the used amount of ammonium hydroxide in preparation. For example, with increasing amounts of ammonium hydroxide used in preparation, the morphology of magnetic MOFs changed from spherical to cube and triangular cone. Moreover, the maximum adsorption capacity of spherical-magnetic MOFs, cubic-magnetic MOFs and triangular cone-magnetic MOFs could be up to 204.08 mg/g, 232.56 mg/g and 270.27 mg/g, respectively. Under optimal conditions, the adsorption process of magnetic MOFs for Cr(VI) was consistent with the pseudo-second-order rate equation (R2 = 1) and Langmuir isotherm model (R2 > 0.99). Therefore, magnetic MOFs developed in this work offered a viable option for the removal of Cr(VI) from wastewater. Full article
(This article belongs to the Special Issue Novel Adsorbents for Environmental Pollutants' Removal)
Show Figures

Figure 1

22 pages, 2950 KiB  
Article
The Impact of N/O-Functional Groups on the Sorption Capabilities of Activated Carbons Derived from Furfuryl Alcohol
by Agnieszka Kałamaga and Rafał J. Wróbel
Molecules 2024, 29(5), 987; https://doi.org/10.3390/molecules29050987 - 24 Feb 2024
Viewed by 799
Abstract
This work describes the effect of nitrogen and oxygen functional groups on the sorption properties of activated carbons produced from furfuryl alcohol. The poly(furfuryl) alcohol underwent carbonization in nitrogen, ammonia, and ammonia and air (in a 3:2 proportion) atmospheres at 600 °C for [...] Read more.
This work describes the effect of nitrogen and oxygen functional groups on the sorption properties of activated carbons produced from furfuryl alcohol. The poly(furfuryl) alcohol underwent carbonization in nitrogen, ammonia, and ammonia and air (in a 3:2 proportion) atmospheres at 600 °C for 4 h. The resulting materials were subsequently activated in a carbon dioxide atmosphere for 1 h at temperatures of 700 °C, 800 °C, 900 °C, and 1000 °C. The X-ray photoelectron spectroscopy (XPS) findings suggest that ammoxidation is superior to amination in terms of nitrogen doping. The maximum nitrogen concentration achieved after ammoxidation was 25 at.%, which decreased to 4 at.% after activation. Additionally, it was observed that oxygen functional groups have a greater impact on porous structure development compared to nitrogen functional groups. The materials activated through carbonization under an ammonia/air atmosphere attained the highest oxygen concentration of roughly 19 at.% as confirmed by XPS. The materials were evaluated for their sorption capacities for carbon dioxide and ethylene, which were 2.2 mmol/g and 2.9 mmol/g, respectively, at 30 °C. Full article
(This article belongs to the Special Issue Novel Adsorbents for Environmental Pollutants' Removal)
Show Figures

Figure 1

Back to TopTop