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Advanced Nanomaterials for Water and Wastewater Treatment
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Advanced Nanomaterials for Water and Wastewater Treatment

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

Deadline for manuscript submissions: 25 September 2025 | Viewed by 2901

Special Issue Editor

Dr. Chandran Krishnaraj

E-Mail Website
Guest Editor
Department of Food Science and Technology, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju 54896, Republic of Korea
Interests: advanced nanomaterials for waste water treatment; nanomaterials for drinking water treatment; nanomembranes; nanomaterials for water reuse; nanosensor for water quality.

Special Issue Information

Dear Colleagues,

Water is the universal solvent capable of dissolving a wide variety of substances, making it a crucial component in many chemical reactions. It is a vital component of all living organisms, making up approximately 60% of an adult human’s body weight. Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume (about 96.5%). But only small portions of water are available for use in the form of groundwater (1.7%), with the rest remaining in the form of glaciers and the ice caps of Antarctica and Greenland (1.7%) and in the air as vapor, clouds and precipitation (0.001%). But a small portion of water is also highly contaminated due to various reasons attributed to physical, chemical and biological pollution. There are a number of water treatment methods available for treating water pollution. However, a low cost, efficient method is very important. Nanotechnology is being increasingly used in water treatment to improve efficiency, effectiveness, and sustainability. Some applications include nanofiltration membranes, nanoparticles for contaminant removal, nanostructured materials for catalysis, nano-biosensors for water quality monitoring, nanotechnology for water disinfection, nanocomposite materials for water treatment, nano-enabled advanced oxidation processes, nanotechnology for desalination, nanotechnology for wastewater treatment and nanotechnology for water reuse.

This Special Issue aims to gather the latest research on advanced nanomaterials for water treatment highlighting innovative technologies to treat water contamination using advanced nanomaterials. Topics of interest include, but are not limited to, the following:

  • Advanced functional nanomaterials for wastewater treatment;
  • Advanced functional nanomaterials for drinking water treatment;
  • Advanced functional nanomaterials for water reuse;
  • Nanofiltration membranes for water treatment;
  • Nano-biosensors for water quality monitoring.

Dr. Chandran Krishnaraj
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. Water 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 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

  • advanced nanomaterials for waste water treatment
  • nanomaterials for drinking water treatment
  • nanomembranes
  • nanomaterials for water reuse
  • nanosensors for water quality

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Published Papers (2 papers)

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Research

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14 pages, 2881 KiB  
Article
An Efficient Photocatalytic Material, rGO-TiO2, That Can Be Industrially Produced: Fabrication and Structural Characterization
by Nan Xiong, Yansen Guo, Yanyan Nie, Yuqing Yao, Zhemian Ying, Wei Zhang, Renduo Liu, Xiaoling Wu, He Zhou, Limin Zhou, Ying Wang, Jian He and Long Yan
Water 2025, 17(2), 161; https://doi.org/10.3390/w17020161 - 9 Jan 2025
Viewed by 880
Abstract
As a well-known photocatalyst, TiO2 still suffers from rapid electron–hole recombination and limited visible light absorption. To overcome these challenges, the combination of graphene and TiO2 has been proposed. However, traditional methods such as ball milling and hydrothermal synthesis face limitations, [...] Read more.
As a well-known photocatalyst, TiO2 still suffers from rapid electron–hole recombination and limited visible light absorption. To overcome these challenges, the combination of graphene and TiO2 has been proposed. However, traditional methods such as ball milling and hydrothermal synthesis face limitations, including high energy consumption and complex procedures. Here, we develop a simple and industrially feasible method to prepare reduced graphene oxide (rGO)-coated TiO2 nanoparticles, referred to as rGO-TiO2 composites. The optimized rGO-TiO2 composites exhibit an enhanced photocatalytic degradation of rhodamine B (RhB) under simulated sunlight conditions, about 99.95% for 4% rGO-TiO2 within 80 min. The first-order reaction rate constant (k) of 4% rGO-TiO2 (0.0867 min−1) is 5.42 times higher than that of nano TiO2 (0.0135 min−1). The key reactive species involved in the degradation process are identified. Additionally, the effects of pH and NaCl concentration on the degradation efficiency of rGO-TiO2 are also investigated. The 4% rGO-TiO2 composite exhibits an excellent photocatalytic activity within the pH range of 3.87–11.89, and the NaCl concentration does not affect its photocatalytic efficiency. After characterization, the enhanced photocatalytic activity is ascribed to the introduction of rGO and the generation of surface oxygen vacancies (OV) and Ti3+ in TiO2 crystals. Full article
(This article belongs to the Special Issue Advanced Nanomaterials for Water and Wastewater Treatment)
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Review

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36 pages, 6613 KiB  
Review
Recent Advances in the Synthesis, Characterization, and Application of Carbon Dots in the Field of Wastewater Treatment: A Comprehensive Review
by Yaxuan Xiao, Zelong Wang, Jingran Fu, Jing Zhang, Qiulai He, Haijun Lu, Qiaohong Zhou and Hongyu Wang
Water 2025, 17(2), 210; https://doi.org/10.3390/w17020210 - 14 Jan 2025
Cited by 3 | Viewed by 1664
Abstract
Carbon dots (CDs), as a revolutionary nanomaterial, exhibit unique advantages in terms of wastewater treatment, offering new opportunities for the development of water treatment technologies due to their simple synthesis methods, excellent biocompatibility, tunable optical properties, and favorable environmental performance. This review systematically [...] Read more.
Carbon dots (CDs), as a revolutionary nanomaterial, exhibit unique advantages in terms of wastewater treatment, offering new opportunities for the development of water treatment technologies due to their simple synthesis methods, excellent biocompatibility, tunable optical properties, and favorable environmental performance. This review systematically discusses the synthesis methods, structural characteristics, and application progress of carbon dots in wastewater treatment, highlighting several key findings. (1) Excellent adsorption performance: CDs can effectively remove heavy metal ions, dyes, and organic pollutants from water. (2) Outstanding photocatalytic performance: Some carbon-dot-enhanced photocatalytic systems can efficiently remove pollutants under visible light. (3) Exceptional selective detection ability: CDs are capable of highly sensitive detection of heavy metals and organic pollutants in water, with the detection limits reaching the nanomolar level. (4) Enhanced membrane separation performance: The high water flux and excellent selectivity of carbon-dot-modified membranes make them suitable for efficient water treatment and water quality separation. (5) Enhancement of biological treatment: In biological treatment systems, CDs can significantly improve the microbial activity and electron transfer efficiency to enhance the efficiency of biological degradation processes. (6) Sustainable utilization of waste as a raw material and regeneration of CDs are conducive to reducing the cost of preparation of CDs. These findings indicate that CDs have broad application potential in wastewater treatment. Furthermore, this review looks ahead to the future development directions of CDs in wastewater treatment, proposing potential innovations in catalytic performance enhancement, cost control, and practical applications, aiming to provide important references and guidance for future research and industrial application of CDs in wastewater treatment. Full article
(This article belongs to the Special Issue Advanced Nanomaterials for Water and Wastewater Treatment)
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