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Innovative Chemical Technologies and Adsorbents for Environmental Pollution Removal and Wastes Recycling

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

Deadline for manuscript submissions: 31 July 2025 | Viewed by 3947

Special Issue Editor

Prof. Dr. Hee-Jeong Choi

E-Mail Website
Guest Editor
Department of Biomedical Sciences, Catholic Kwandong University, Beomil-ro 579 beon-gil, Gangneung-si 25601, Republic of Korea
Interests: adsorption; heavy metal removal; nanocomposition; degradation; hydrogen; fabricated materials

Special Issue Information

Dear Colleagues,

Adsorption is a well-established operation that is commonly utilized in water decontamination and has been considered for application in the separation and recovery of substances of economic importance or at risk of scarcity, such as phosphate and technology metals. Many innovative non-conventional adsorbents based on molecular or macromolecular architectures, of natural or synthetic origin, have been proposed to remove environmental pollutants from water and wastewater via liquid–solid adsorption processes.

The main objective of this Special Issue is to provide an overview of recent advances in the development and design of novel adsorbents with superior adsorption capacities for the removal of various pollutants in the environment, which may involve new preparation methods, material designs, characterization techniques, and analyses of the adsorption mechanisms and adsorption capacity of various pollutants.

Prof. Dr. Hee-Jeong Choi
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

  • adsorption
  • heavy metal removal
  • nanocomposition
  • photocatalysis
  • degradation
  • fabricated materials

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

23 pages, 4125 KiB  
Article
Effect of Beech Sawdust Conditions Modification on the Efficiency of the Sorption of Anionic and Cationic Dyes
by Paula Bugajska, Urszula Filipkowska and Tomasz Jóźwiak
Molecules 2024, 29(21), 5017; https://doi.org/10.3390/molecules29215017 - 23 Oct 2024
Viewed by 814
Abstract
The article presents studies on the effect of the modification method of beech sawdust on the sorption capacity of the anionic dye Reactive Black 5 (RB5) as well as the cationic dye Basic Violet 10 (BV10). In the studies, the pH value, the [...] Read more.
The article presents studies on the effect of the modification method of beech sawdust on the sorption capacity of the anionic dye Reactive Black 5 (RB5) as well as the cationic dye Basic Violet 10 (BV10). In the studies, the pH value, the dose of sawdust activated with epichlorohydrin and the dose of ammonia were determined for the efficiency of the removal of anionic and cationic dyes. In the next phase of the study, the pH and the dose of epichlorohydrin activator on the previously activated sorbent were determined. The modification proposed in the work, which consists in the amination of sawdust in direct reaction with ammonia, increased the efficiency of the sorption of anionic dyes. This reaction increased the positive charge on the surface of the sorbent by introducing –NH2 groups, which led to an increase in the electrostatic attraction between the sorbent and the anionic dye, but to a decrease in the interaction between the sorbent and the cationic dye. Full article
(This article belongs to the Special Issue Innovative Chemical Technologies and Adsorbents for Environmental Pollution Removal and Wastes Recycling)
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13 pages, 9521 KiB  
Article
Preparation of Perovskite-Type LaMnO3 and Its Catalytic Degradation of Formaldehyde in Wastewater
by Qingguo Ma, Pengcheng Huo, Kesong Wang, Ye Yuan, Songjiang Bai, Chentong Zhao and Wenzhuo Li
Molecules 2024, 29(16), 3822; https://doi.org/10.3390/molecules29163822 - 12 Aug 2024
Viewed by 1248
Abstract
Formaldehyde (HCHO) is identified as the most toxic chemical among 45 organic compounds found in industrial wastewater, posing significant harm to both the environment and human health. In this study, a novel approach utilizing the Lanthanum-manganese complex oxide (LaMnO3)/peroxymonosulfate (PMS) system [...] Read more.
Formaldehyde (HCHO) is identified as the most toxic chemical among 45 organic compounds found in industrial wastewater, posing significant harm to both the environment and human health. In this study, a novel approach utilizing the Lanthanum-manganese complex oxide (LaMnO3)/peroxymonosulfate (PMS) system was proposed for the effective removal of HCHO from wastewater. Perovskite-Type LaMnO3 was prepared by sol-gel method. The chemical compositions and morphology of LaMnO3 samples were analyzed through thermogravimetric analysis (TG), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The effects of LaMnO3 dosage, PMS concentration, HCHO concentration, and initial pH on the HCHO removal rate were investigated. When the concentration of HCHO is less than 1.086 mg/mL (5 mL), the dosage of LaMnO3 is 0.06 g, and n(PMS)/n(HCHO) = 2.5, the removal rate of HCHO is more than 96% in the range of pH = 5–13 at 25 °C for 10 min. Compared with single-component MnO2, the perovskite structure of LaMnO3 is beneficial to the catalytic degradation of HCHO by PMS. It is an efficient Fenton-like oxidation process for treating wastewater containing HCHO. The LaMnO3 promoted the formation of SO4•− and HO•, which sequentially oxidized HCHO to HCOOH and CO2. Full article
(This article belongs to the Special Issue Innovative Chemical Technologies and Adsorbents for Environmental Pollution Removal and Wastes Recycling)
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18 pages, 3166 KiB  
Article
Adsorption of Cu(II) and Ni(II) from Aqueous Solutions Using Synthesized Alkali-Activated Foamed Zeolite Adsorbent: Isotherm, Kinetic, and Regeneration Study
by Eliška Svobodová, Zdeněk Tišler, Kateřina Peroutková, Kateřina Strejcová, Jan Abrham, Josef Šimek, Zahra Gholami and Mohammadtaghi Vakili
Molecules 2024, 29(10), 2357; https://doi.org/10.3390/molecules29102357 - 16 May 2024
Cited by 8 | Viewed by 1415
Abstract
Water pollution, particularly from heavy metals, poses a significant threat to global health, necessitating efficient and environmentally friendly removal methods. This study introduces novel zeolite-based adsorbents, specifically alkali-activated foamed zeolite (AAFZ), for the effective adsorption of Cu(II) and Ni(II) ions from aqueous solutions. [...] Read more.
Water pollution, particularly from heavy metals, poses a significant threat to global health, necessitating efficient and environmentally friendly removal methods. This study introduces novel zeolite-based adsorbents, specifically alkali-activated foamed zeolite (AAFZ), for the effective adsorption of Cu(II) and Ni(II) ions from aqueous solutions. The adsorbents’ capabilities were comprehensively characterized through kinetic and isotherm analyses. Alkaline activation induced changes in chemical composition and crystalline structure, as observed via XRF and XRD analyses. AAFZ exhibited a significantly larger pore volume (1.29 times), higher Si/Al ratio (1.15 times), and lower crystallinity compared to ZZ50, thus demonstrating substantially higher adsorption capacity for Cu(II) and Ni(II) compared to ZZ50. The maximum monolayer adsorption capacities of ZZ50 and AAFZ for Cu(II) were determined to be 69.28 mg/g and 99.54 mg/g, respectively. In the case of Ni(II), the maximum monolayer adsorption capacities for ZZ50 and AAFZ were observed at 48.53 mg/g and 88.99 mg/g, respectively. For both adsorbents, the optimum pH for adsorption of Cu(II) and Ni(II) was found to be 5 and 6, respectively. Equilibrium was reached around 120 min, and the pseudo-second-order kinetics accurately depicted the chemisorption process. The Langmuir isotherm model effectively described monolayer adsorption for both adsorbents. Furthermore, the regeneration experiment demonstrated that AAFZ could be regenerated for a minimum of two cycles using hydrochloric acid (HCl). These findings highlight the potential of the developed adsorbents as promising tools for effective and practical adsorption applications. Full article
(This article belongs to the Special Issue Innovative Chemical Technologies and Adsorbents for Environmental Pollution Removal and Wastes Recycling)
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