Structural Modification of Colorants to Safeguard the Environment

A special issue of Colorants (ISSN 2079-6447).

Deadline for manuscript submissions: 31 December 2026 | Viewed by 1026

Special Issue Editor


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Guest Editor
School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
Interests: photophysics; optical spectroscopy; dye chemistry; kinetics; energy and electron transfer; physical chemistry
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Special Issue Information

Dear Colleagues,

Considering the long and sad history behind environmental pollution during textile dyeing, which continues to be a major problem, this volume will look into ways to prevent the escape of colorants into the water system. An accompanying problem has been the tremendous amount of water wasted during the dyeing treatment. New and innovative practices are being introduced into the industry, and we need to advance these ideas. This Special Issue aims to address the key features associated with the safe removal of undesirable colorants—from an interdisciplinary angle. The goal is to enhance our shared understanding of ways and means to affect the selective removal of certain colorants without damage to the substrate and without creating an environmental problem. Submissions from a broad range of disciplines are welcome.

The following are potential topics that can be included:

  • Photochemical treatment;
  • Extraction techniques;
  • Adsorption phenomena;
  • Chemical treatments;
  • Recovery, repair and reuse;
  • Textile wastewater remediation;
  • Catalysis and autocatalytic processes
  • Dyes without waste;
  • Spectroscopic analysis;
  • Enzymatic treatments;
  • Kinetics and reaction mechanisms;
  • Aging processes and discoloration phenomena;
  • Ecotoxicity and sustainable remediation.

We will start reviewing the submitted manuscripts upon submission. You may expect an overall quick turn-around time for early submissions. 

Prof. Dr. Anthony Harriman
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 250 words) can be sent to the Editorial Office for assessment.

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. Colorants is an international peer-reviewed open access quarterly 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 1000 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

  • photochemical treatment
  • adsorption
  • textile wastewater remediation
  • catalysis and autocatalytic processes
  • aging processes
  • discoloration

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Published Papers (1 paper)

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Research

28 pages, 6188 KB  
Article
Eggshell-Derived CaO-CuFe2O4 Nanocomposite for Sustainable and Highly Efficient Malachite Green Dye Removal
by Rocío Magdalena Sánchez-Albores, Clara López-Aguilar, Odín Reyes-Vallejo, Francisco Javier Cano, Johana De la Cruz-Ascencio, J. Escorcia-García, A. Cruz-Salomón and A. Ashok
Colorants 2026, 5(2), 11; https://doi.org/10.3390/colorants5020011 - 3 Apr 2026
Cited by 1 | Viewed by 677
Abstract
Water contamination by synthetic dyes such as malachite green (MG) remains a significant environmental and public health challenge due to their high toxicity, chemical stability, and resistance to biodegradation. In this study, a CaO-CuFe2O4 composite was synthesized through a sustainable [...] Read more.
Water contamination by synthetic dyes such as malachite green (MG) remains a significant environmental and public health challenge due to their high toxicity, chemical stability, and resistance to biodegradation. In this study, a CaO-CuFe2O4 composite was synthesized through a sustainable route using eggshells and orange peel as agro-industrial waste precursors. Comprehensive structural, spectroscopic and microscopic analyses confirmed the coexistence of a predominant CaO-based phase with spinel CuFe2O4, together with nanometric features, satisfactory elemental dispersion and practical magnetic recoverability. Under the experimental conditions employed, the composite exhibited high adsorption performance towards MG, reaching an equilibrium capacity of 2288.4 mg g−1 and 99.98% decolorization within 60 min. The kinetics were better described by the pseudo-second-order model, while the equilibrium behavior was more satisfactorily fitted by the Langmuir isotherm than by the Freundlich model. Thermodynamic analysis indicated that the adsorption process was favorable over the temperature range studied and became more pronounced at higher temperature. The results suggest that the adsorption behavior arises from the combined influence of surface chemistry, calcium-derived basic sites, ferrite-associated metal centers and interfacial accessibility, rather than from surface area alone. In addition, the material could be readily separated from aqueous solution using an external magnetic field, highlighting its practical post-treatment recoverability. Overall, this work demonstrates a viable waste valorization strategy for the development of a magnetically recoverable CaO-CuFe2O4 adsorbent for cationic dye removal. Beyond the specific case of MG, the study underscores the potential of agro-waste-derived hybrid oxides as application-relevant materials for water remediation. Full article
(This article belongs to the Special Issue Structural Modification of Colorants to Safeguard the Environment)
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