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Nanomaterials for the Removal of Pollutants from Water/Wastewater Applications

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 5922

Special Issue Editor


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Guest Editor
Nanotechnology and Catalysis Research Centre, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
Interests: nanomaterials; photocatalysts; wastewater treatment; water splitting; CO2 reduction and environmental remediation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Water is the most important resource used in daily routines for all living organisms. However, the high use of water has led to water scarcity worldwide. In addition, water is contaminated by various gases, microorganisms, and other toxins (chemicals and heavy metals) during rainfall and as water flows from one body of water to another, leading to water pollution. Hence, effective wastewater treatment is required for economic growth in the current water-resource-constrained era. Wastewater treatment methods should have the advantages of a compact design and should be highly effective in terms of both quality and cost. Researchers have been motivated to explore their ideas in nanomaterial science following advancements in the field. This Special Issue aims to cover the many different types of nanomaterials that can effectively treat contaminated water (containing metal toxins, and other organic and inorganic impurities) because of their special characteristics such as a larger surface area and the ability to function at low concentrations. Although approaches using nanostructured catalytic membranes, nanosorbents, and nano-photocatalysts are effective and environmentally friendly for removing pollutants from wastewater, there is a need for more energy and money invested into clean wastewater.

Dr. Suresh Sagadevan
Guest Editor

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Keywords

  • nanomaterials
  • nano-adsorbents
  • nano-catalysts
  • nano-membranes
  • wastewater treatment

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Published Papers (2 papers)

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Research

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23 pages, 92102 KiB  
Article
Remediation of Methylene Blue Dye from Wastewater by Using Zinc Oxide Nanoparticles Loaded on Nanoclay
by Nisha Choudhary, Virendra Kumar Yadav, Huma Ali, Daoud Ali, Bader O. Almutairi, Simona Cavalu and Ashish Patel
Water 2023, 15(7), 1427; https://doi.org/10.3390/w15071427 - 6 Apr 2023
Cited by 10 | Viewed by 2995
Abstract
Dyes are one of the major environmental pollutants throughout the world, leading to pollution and numerous diseases. Though several techniques have been applied for the remediation of dyes, most of them are ineffective. The authors developed a halloysite clay/zinc oxide nanocomposite (HC/ZnONC) via [...] Read more.
Dyes are one of the major environmental pollutants throughout the world, leading to pollution and numerous diseases. Though several techniques have been applied for the remediation of dyes, most of them are ineffective. The authors developed a halloysite clay/zinc oxide nanocomposite (HC/ZnONC) via a chemical route in the present study. The nanocomposite and its constituents, i.e., raw halloysite clay (HC) and zinc oxide nanoparticles (ZnONPs) (synthesized using the same chemical method) were analyzed for their detailed properties by sophisticated instruments. The field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) analysis showed spherical-shaped ZnONPs with an average size of 54.9 nm and tube-like shapes of HC with a diameter ranging from 40–200 nm and a length at the micron scale, while the nanocomposite had incorporated ZnONPs in their tube-like structures. Ultraviolet-Diffuse Reflectance Spectroscopic (UV-DRS) study revealed the photocatalytic ability of the nanocomposite with a band of 3.08 eV. A high surface area of 60.25 m2/g and the microporous and mesoporous nature of the nanocomposite were confirmed by the Brunauer–Emmet–Teller (BET) surface area analyzer. Finally, the developed nanocomposite was used for the remediation of methylene blue from the aqueous solutions, and the efficiency of removal varied from 90 to 97%. Full article
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Review

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15 pages, 2235 KiB  
Review
Processing of Carbon-Based Nanomaterials for the Removal of Pollutants from Water/Wastewater Application
by Rashmi Singh, Melvin S. Samuel, Madhumita Ravikumar, Selvarajan Ethiraj, Venkatesan Savunthari Kirankumar, Mohanraj Kumar, R. Arulvel and Sagadevan Suresh
Water 2023, 15(16), 3003; https://doi.org/10.3390/w15163003 - 20 Aug 2023
Cited by 6 | Viewed by 2581
Abstract
In both the inorganic and organic worlds, carbon-based nanomaterials, such as benzene, diamond, graphite, fullerene, and carbon nanotubes, are abundant. In science laboratories, carbon is the focal point of activity. In this overview, the synthesis, characteristics, and several uses of graphene—including energy conversion, [...] Read more.
In both the inorganic and organic worlds, carbon-based nanomaterials, such as benzene, diamond, graphite, fullerene, and carbon nanotubes, are abundant. In science laboratories, carbon is the focal point of activity. In this overview, the synthesis, characteristics, and several uses of graphene—including energy conversion, energy storage, electronics, and biosensing—were explored with a focus on ecologically friendly production techniques. This article also discusses recent advancements in the detection and treatment of organic contaminants and heavy metals utilizing nanomaterials. In this article, we outline some recent developments in the creation of innovative nanomaterials and nanostructures and methods for treating organic contaminants and heavy metals in water. The essay presents the current state of the field and, in our opinion, should be helpful to anybody interested in nanomaterials and related materials. Full article
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