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Nanomaterials
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Multifunctional Nanostructures for Water Remediation
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Multifunctional Nanostructures for Water Remediation

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Environmental Nanoscience and Nanotechnology".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 2236

Special Issue Editors

Dr. Jing Wang

E-Mail Website
Guest Editor
Department of Food Science and Technology, Northwest University, Shaanxi, China
Interests: heavy metal; porous and 2D materials; adsorption; food safety control
Prof. Dr. Wenlu Li

E-Mail Website
Guest Editor
School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710072, China
Interests: nanomaterials; adsorption; aqueous stability; heavy metal

Special Issue Information

Dear Colleagues,

Pollution associated with anthropogenic species in water, such as heavy metals, organic pollutants, and micro/nanoplastics, is becoming a serious environmental problem not only because of the important damage it causes in the environment, leading to a loss of biodiversity, but also because it may severely threaten food ecosystems and induce harmful impacts on human health. As a consequence of the large external surface and higher dispersion on the surface, nanostructured materials enable either the novel modification of adsorbents and catalysts or the integration of biological and physicochemical processes for water remediation. The multifunctional nanostructures interact with pollutants through their solid–liquid interfaces; as a consequence, the interaction and the support of nanostructured materials are crucial factors that determine the overall nanoscale behaviors.

Considering the above, the present Special Issue of Nanomaterials aims to present the current state-of-the-art in the use of multifunctional nanostructures in water remediation—a field that includes either the novel modification of adsorbents and catalysts or the integration of biological and physicochemical processes through electrochemical, photochemical, adsorption, and ion exchange, among others. It also invites authors to contribute sustainable and emerging technologies based on various nanostructures for water treatment. In the present Special Issue, both academic and industrial researchers are encouraged to foster current knowledge and present new ideas for future nanostructured applications in water remediation.

Dr. Jing Wang
Prof. Dr. Wenlu Li
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. Nanomaterials 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 2900 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

  • multifunctional nanostructures
  • water remediation
  • adsorption
  • catalysis
  • biological and physicochemical processes

Published Papers (2 papers)

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Research

22 pages, 5345 KiB  
Article
Structural Properties of Graphene Oxide Prepared from Graphite by Three Different Methods and the Effect on Removal of Cr(VI) from Aqueous Solution
by Feng Gao, Lei Zhang, Libin Yang, Xuefei Zhou and Yalei Zhang
Nanomaterials 2023, 13(2), 279; https://doi.org/10.3390/nano13020279 - 9 Jan 2023
Cited by 4 | Viewed by 1538
Abstract
Herein, three types of graphene oxides (GOs, GO-M1, GO-M2 and GO-M3) have been successfully prepared from graphite by three different methods and utilized for the removal of Cr(VI) from aqueous solutions. Further, the effects of initial concentration and pH, adsorbent dosage, contact time [...] Read more.
Herein, three types of graphene oxides (GOs, GO-M1, GO-M2 and GO-M3) have been successfully prepared from graphite by three different methods and utilized for the removal of Cr(VI) from aqueous solutions. Further, the effects of initial concentration and pH, adsorbent dosage, contact time and temperature on the adsorption performance of GOs were investigated by batch adsorption experiments. Furthermore, the adsorption mechanisms for Cr(VI) adsorption by GOs are mainly the redox reaction and electrostatic attraction, while there are also pore filling, ion exchange and complexation involved in these adsorption processes. The adsorption kinetic and isotherm data indicate that these adsorption processes of GOs on Cr(VI) are dominantly monolayer chemisorption and equilibrium can be reached in 30 min. The saturation adsorption capacities (Qm, 298.15 K) of GO-M1, GO-M2 and GO-M3 for Cr(VI) are estimated to be 3.5412 mg⋅g−1, 2.3631 mg⋅g−1 and 7.0358 mg⋅g−1, respectively. Moreover, the adsorption thermodynamic study showed that these adsorption processes of Cr(VI) by the three types of GOs at 298.15 K to 323.15 K are endothermic, entropy-driven and thermodynamically spontaneous and feasible. Overall, these findings provided vital insights into the mechanism and application of Cr(VI) removal by GOs. Full article
(This article belongs to the Special Issue Multifunctional Nanostructures for Water Remediation)
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13 pages, 12110 KiB  
Article
Improved Photocatalytic Activity via n-Type ZnO/p-Type NiO Heterojunctions
by Ligang Ma, Xiaoqian Ai, Yujie Chen, Pengpeng Liu, Chao Lin, Kehong Lu, Wenjun Jiang, Jiaen Wu and Xiang Song
Nanomaterials 2022, 12(20), 3665; https://doi.org/10.3390/nano12203665 - 18 Oct 2022
Cited by 9 | Viewed by 1540
Abstract
The design and construct pn heterojunction to reduce the recombination rate of photogenerated electron-hole pairs can effectively improve photocatalytic activity. In this study, ZnO/NiO heterojunctions were fabricated by annealing a Zn/Ni metal organic framework precursor synthesized via coprecipitation. The effects of the precursor [...] Read more.
The design and construct pn heterojunction to reduce the recombination rate of photogenerated electron-hole pairs can effectively improve photocatalytic activity. In this study, ZnO/NiO heterojunctions were fabricated by annealing a Zn/Ni metal organic framework precursor synthesized via coprecipitation. The effects of the precursor annealing temperature on the microstructure, morphology, and optical properties of the ZnO/NiO nanocomposites were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis absorption spectroscopy. The results showed that the nanocomposite was composed of hexagonal wurtzite ZnO and cubic NiO, with the former being the dominant phase. Large ZnO nanoparticles were attached to small NiO nanoparticles, and a pn heterojunction interface was formed. The photodegradation performance of the nanomaterials was evaluated by monitoring the degradation of RhB under irradiation by ultraviolet light. The ZnO/NiO nanocomposites exhibited excellent photocatalytic activity when the annealing temperature was 550 °C. The photodegradation mechanism was also analyzed in detail, revealing that the heterojunction between the n-type ZnO and the p-type NiO played an important role in impeding the recombination of photogenerated electron-hole pairs and improving the photocatalytic efficiency. Full article
(This article belongs to the Special Issue Multifunctional Nanostructures for Water Remediation)
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