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Application of Nanotechnology and Nanomaterials in Removal of Heavy Metals,...
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Special Issue "Application of Nanotechnology and Nanomaterials in Removal of Heavy Metals, Dyes, or Emerging Pollutants from Wastewater"

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 2201

Special Issue Editors

Dr. Lai Yee Lee

E-Mail Website
Guest Editor
Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, 43500 Semenyih, Selangor Darul Ehsan, Malaysia
Interests: nanotechnology and nanomaterials for environmental pollution control; water and wastewater treatment focusing on pharmaceuticals, heavy metals and dyes removal; air pollution control focusing on VOCs removal; thermochemical conversion of agricultural wastes into biofuel
Prof. Dr. Suyin Gan

E-Mail Website
Guest Editor
Department of Chemical and Environmental Engineering, University of Nottingham Malaysia, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia
Interests: biofuel/biomass processing technologies; combustion and emissions of biofuels; water and soil remediation
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Sivakumar Manickam

E-Mail Website
Guest Editor
Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan BE1410, Brunei
Interests: nanotechnology; ultrasound; pharmaceuticals; water treatment; extraction

Special Issue Information

Dear Colleagues,

This Special Issue, “Application of Nanotechnology and Nanomaterials in Removal of Heavy Metals, Dyes, or Emerging Pollutants from Wastewater”, aims to present novel results of nanotechnology and nanomaterials applications in the removal of water pollutants such as heavy metals, dyes, pharmaceuticals or emerging pollutants.

Water contamination caused by the discharge of heavy metals, dyes and other emerging pollutants is a serious environmental issue impacting all life forms. Nano-based treatment technologies have been demonstrated to have promising removal efficiencies towards the aforementioned pollutants, such as adsorption and photocatalysis. Nonetheless, the removal efficiency of the systems is influenced by the selection of removing medium. Lately, the application of nanotechnology and nanomaterials in separation processes has attracted much attention and enthusiasm from the scientific community due to the intrinsic properties of nanomaterials which can facilitate new removal mechanisms for the aqueous pollutants.

Therefore, it is my pleasure to invite you to contribute your research works to this Special Issue, which is dedicated to novel nanomaterials development for the removal of aqueous pollutants. Your contribution to this Special Issue will be extremely helpful to those working in a wide range of disciplines encompassing environmental and engineering, as well as researchers and practitioners within the water and wastewater treatment sectors.

Dr. Lai Yee Lee
Prof. Dr. Suyin Gan
Prof. Dr. Sivakumar Manickam
Guest Editors

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. Separations is an international peer-reviewed open access monthly 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 2600 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
  • synthetic dye
  • pharmaceutical residue
  • nanomaterials
  • nanotechnology
  • water and wastewater treatment
  • oxidation
  • photocatalysis

Published Papers (3 papers)

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Research

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Article
Fast Procedure for Removing Silver Species in Waters Using a Simple Magnetic Nanomaterial
by
Yésica Vicente-Martínez
,
Moisés Ruiz-Mendieta
,
Manuel Caravaca-Garratón
,
Manuel Hernández-Córdoba
and
Ignacio López-García
Separations 2023, 10(7), 398; https://doi.org/10.3390/separations10070398 - 10 Jul 2023
Viewed by 597
Abstract
The increase in the production and use of disinfectants containing silver atoms (in both its ionic and nanomeric forms) in their formulation, due to the global pandemic situation caused by COVID-19, has increased the presence of silver species in wastewater. Moreover, silver atoms [...] Read more.
The increase in the production and use of disinfectants containing silver atoms (in both its ionic and nanomeric forms) in their formulation, due to the global pandemic situation caused by COVID-19, has increased the presence of silver species in wastewater. Moreover, silver atoms are now considered as emerging pollutants in water. In this work, we propose a novel method for the instantaneous and simultaneous removal of ionic and nanomeric silver in water samples, using a previously unpublished methodology consisting of the in situ formation of magnetic nanoparticles in the aqueous samples to be treated. While the nanoparticle precursors react to form them, the silver atoms present in the sample are adsorbed onto them due to a strong electrostatic interaction. As the final nanoparticles are magnetic, they can be easily removed from the aqueous medium using a magnet, leaving the samples free of silver species. The innovative feature of the method is that the adsorbent is synthesized in situ, within the sample to be treated, making the approach a low-cost, easy-to-perform solution. Temperature, contact time, dose of Fe3O4, and concentration of nanomeric and ionic silver were investigated. The results showed that at 50 °C, 100% of both silver species were removed from the water samples simultaneously. The surface of Fe3O4 was characterized before and after the application of the removal process using energy-dispersive X-ray spectroscopy and Field Emission scanning electron microscopy. Adsorption kinetics and equilibrium isotherms studied reveal a Langmuir-type physicochemical process. The procedure has been applied to different water samples (river and drinking water) with excellent results, making the method a new standard for the removal of ionic and nanomeric silver. In addition, the nanoparticles formed could be recycled and reused for other analytical and decontamination purposes. Full article
(This article belongs to the Special Issue Application of Nanotechnology and Nanomaterials in Removal of Heavy Metals, Dyes, or Emerging Pollutants from Wastewater)
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Article
Remediation of Amitriptyline Pharmaceutical Wastewater by Heteroatom-Doped Graphene Oxide: Process Optimization and Packed-Bed Studies
by
Wan Ting Tee
,
Jasmine Chua
,
Jia En Yong
,
Billie Yan Zhang Hiew
,
Suyin Gan
and
Lai Yee Lee
Separations 2023, 10(7), 392; https://doi.org/10.3390/separations10070392 - 03 Jul 2023
Viewed by 703
Abstract
Amitriptyline residue released into the aquatic ecosystem can have detrimental consequences on marine organisms and human wellbeing via consumption of polluted water. With a uniquely large surface area and abundant functionalities, graphene oxide adsorption offers a remediation solution for such water pollution. This [...] Read more.
Amitriptyline residue released into the aquatic ecosystem can have detrimental consequences on marine organisms and human wellbeing via consumption of polluted water. With a uniquely large surface area and abundant functionalities, graphene oxide adsorption offers a remediation solution for such water pollution. This study focused on synthesizing a novel graphene-based adsorbent via ice-templating of boron-doped graphene substrate. The batch adsorption performance of the as-synthesized adsorbent was explored by central composite design (CCD), while its potential large-scale application was evaluated with a packed-bed column study. The CCD optimized conditions of 12.5 mg dosage, 32 min adsorption time, 30 °C operating temperature and 70 ppm concentration produced the highest removal efficiency of 87.72%. The results of the packed-bed study indicated that continuous adsorption of amitriptyline was best performed at a graphene bed of 3.5 cm in height, with 100 ppm of the pharmaceutical solution flowing at 2 mL/min. Furthermore, the breakthrough curve was effectively portrayed by the Log Bohart–Adams model. The as-synthesized adsorbent showed a high regeneration potential using ethanol eluent via multiple adsorption–desorption cycles. The results suggest the boron-doped graphene adsorbent in packed-bed as a highly effective system to remediate amitriptyline in an aqueous environment. Full article
(This article belongs to the Special Issue Application of Nanotechnology and Nanomaterials in Removal of Heavy Metals, Dyes, or Emerging Pollutants from Wastewater)
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Article
Application of ZnO/WO3 Composite Nanofiber Photocatalysts in Textile Wastewater Treatment
by
Yongxin Xu
,
Hui Yan
and
Tiwei Chen
Separations 2023, 10(6), 339; https://doi.org/10.3390/separations10060339 - 31 May 2023
Viewed by 536
Abstract
Semiconductor photocatalysis technology is an environmentally friendly and efficient emerging technology. This method can use sunlight as a driving force to quickly decompose organic pollutants in water bodies. Zinc oxide (ZnO) and tungsten oxide (WO3) photocatalysts can absorb sunlight and participate [...] Read more.
Semiconductor photocatalysis technology is an environmentally friendly and efficient emerging technology. This method can use sunlight as a driving force to quickly decompose organic pollutants in water bodies. Zinc oxide (ZnO) and tungsten oxide (WO3) photocatalysts can absorb sunlight and participate in photocatalytic degradation reactions due to their relatively narrow band gap. Highly photosensitive WO3 nanofibers and ZnO/WO3 composite nanofibers were fabricated via the electrospinning method. When 100 mg/L of rhodamine B (Rh B) solution was used as the degradation substrate, the degradation efficiencies of WO3 and ZnO/WO3 for Rh B dye were 70% and 90%, respectively, after a photocatalytic reaction of 120 min. The surface morphology, crystal structure, and optical properties of ZnO/WO3 composite nanofibers and WO3 nanofibers were characterized by SEM, XRD, XPS, and UV-vis absorption spectra, and the experimental results were analyzed and explained using different mechanisms. The results show that ZnO/WO3 composite nanofibers have better UV-visible light absorption performance, and the sample has a higher UV-visible light utilization rate. This was mainly due to the fact that a P-N heterojunction was formed in the semiconductor composite, and the electron–hole pair could realize rapid separation under the drive of a built-in electric field force, which promoted the migration of carrier. Therefore, the photocatalytic activity of the ZnO/WO3 catalyst was significantly higher than that of the WO3 catalyst, which promoted rapid improvement of the photocatalytic degradation efficiency of the Rh B dye. Full article
(This article belongs to the Special Issue Application of Nanotechnology and Nanomaterials in Removal of Heavy Metals, Dyes, or Emerging Pollutants from Wastewater)
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