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Special Issue "Nanomaterial Application in Environmental Monitoring and Water Treatment"

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

Deadline for manuscript submissions: 20 April 2024 | Viewed by 4130

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Special Issue Editor

Prof. Dr. Xing Chen

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Guest Editor

Industry and Equipment Technology Institute, Hefei University of Technology, Hefei 230009, China
Interests: nanocomposites for water pollution control; electrochemical sensing interfaces; industrial wastewater treatment

Special Issue Information

Dear Colleagues,

Improvements in living standards and the rapid development of industrialization have combined to increase the amount of pollutants, including large amounts of emerging pollutants, entering aqueous environments. There are urgent demands for efficient materials and technologies to carry out environmental monitoring and water treatment.

Many scientists have devoted themselves to studying nanomaterials in order to discover environmental applications based on their unique properties, such as their high specific areas, adequate activated sites, and high energy conversion efficiency. Various types of sensing interfaces and devices (fluorescent, Raman, colorimetric, electrochemical, electrical, etc.) have been designed for monitoring pollutants, such as persistent organic pollutants, heavy metal ions and pesticides, in aqueous environments. Additionally, nanomaterials demonstrate a huge potential for water treatment via adsorption and catalytic methods.

This Special Issue welcomes contributions devoted to the design, characterization, and application of novel nanomaterials for environmental monitoring and water treatment, especially and predominately those focused on nanomaterials with high efficiency, low cost, and potential practical applications.

Prof. Dr. Xing Chen
Guest Editor

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Keywords

nanostructured materials
sensitive nanomaterials
pollutant monitoring
nanocatalysts
advanced oxidation process
water treatment
wastewater treatment

Published Papers (3 papers)

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Research

17 pages, 10155 KiB

Open AccessArticle

Synthesis and Characterization of Porous MgO Nanosheet-Modified Activated Carbon Fiber Felt for Fluoride Adsorption

and

Nanomaterials 2023, 13(6), 1082; https://doi.org/10.3390/nano13061082 - 16 Mar 2023

Cited by 1 | Viewed by 954

Abstract

In the present work, the porous MgO nanosheet-modified activated carbon fiber felt (MgO@ACFF) was prepared for fluoride removal. The MgO@ACFF was characterized by XRD, SEM, TEM, EDS, TG, and BET. The fluoride adsorption performance of MgO@ACFF also has been investigated. The adsorption rate of the MgO@ACFF toward fluoride is fast; more than 90% of the fluoride ions can be adsorbed within 100 min, and the adsorption kinetics of MgO@ACFF can be fitted in a pseudo-second-order model. The adsorption isotherm of MgO@ACFF fitted well in the Freundlich model. Additionally, the fluoride adsorption capacity of MgO@ACFF is larger than 212.2 mg/g at neutral. In a wide pH range of 2–10, the MgO@ACFF can efficiently remove fluoride from water, which is meaningful for practical usage. The effect of co-existing anions on the fluoride removal efficiency of the MgO@ACFF also has been studied. Furthermore, the fluoride adsorption mechanism of the MgO@ACFF was studied by the FTIR and XPS, and the results reveal a hydroxyl and carbonate co-exchange mechanism. The column test of the MgO@ACFF also has been investigated; 505-bed volumes of 5 mg/L fluoride solution can be treated with effluent under 1.0 mg/L. It is believed that the MgO@ACFF is a potential candidate for a fluoride adsorbent. Full article

(This article belongs to the Special Issue Nanomaterial Application in Environmental Monitoring and Water Treatment)

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13 pages, 6235 KiB

Open AccessFeature PaperArticle

Evaluation of the Photocatalytic Activity of Distinctive-Shaped ZnO Nanocrystals Synthesized Using Latex of Different Plants Native to the Amazon Rainforest

Robert S. Matos

John M. Attah-Baah

Michael D. S. Monteiro

Rosane M. P. B. Oliveira

and

Nilson S. Ferreira

Nanomaterials 2022, 12(16), 2889; https://doi.org/10.3390/nano12162889 - 22 Aug 2022

Cited by 5 | Viewed by 1195

Abstract

ZnO nanocrystals with three different morphologies have been synthesized via a simple sol-gel-based method using Brosimum parinarioides (bitter Amapá) and Parahancornia amapa (sweet Amapá) latex as chelating agents. X-ray diffraction (XRD) and electron diffraction patterns (SAED) patterns showed the ZnO nanocrystals were a pure hexagonal wurtzite phase of ZnO. XRD-based spherical harmonics predictions and HRTEM images depicted that the nanocrystallites constitute pitanga-like (~15.8 nm), teetotum-like (~16.8 nm), and cambuci-like (~22.2 nm) shapes for the samples synthesized using bitter Amapá, sweet Amapá, and bitter/sweet Amapá chelating agent, respectively. The band gap luminescence was observed at ~2.67–2.79 eV along with several structural defect-related, blue emissions at 468–474 nm (V_O, V_Zn, Zn_i), green emissions positioned at 513.89–515.89 (h-

V_{O}^{+}

), and orange emission at 600.78 nm (

V_{O}^{+}

–

V_{O}^{+ +}

). The best MB dye removal efficiency (85%) was mainly ascribed to the unique shape and oxygen vacancy defects found in the teetotum-like ZnO nanocrystals. Thus, the bitter Amapá and sweet Amapá latex are effective chelating agents for synthesizing distinctive-shaped ZnO nanocrystals with highly defective and remarkable photocatalytic activity. Full article

(This article belongs to the Special Issue Nanomaterial Application in Environmental Monitoring and Water Treatment)

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16 pages, 5614 KiB

Open AccessArticle

Eco-Friendly NiO/Polydopamine Nanocomposite for Efficient Removal of Dyes from Wastewater

Marwa A. El-Ghobashy

Hisham Hashim

Moustafa A. Darwish

Mayeen Uddin Khandaker

and

Nanomaterials 2022, 12(7), 1103; https://doi.org/10.3390/nano12071103 - 27 Mar 2022

Cited by 8 | Viewed by 1783

Abstract

The rapid development of industries discharges huge amounts of wastewater that contain surface water. For this reason, we used NiO/polydopamine (NiO/PDA) nanocomposite as an efficient material for the removal of Methyl violet 2B from water. It was synthesized and then characterized by Fourier Transform Infrared (FT-IR) spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) analysis, Transmission Electron Microscopy (TEM), and Brunauer–Emmett–Teller (BET). The EDX analysis confirmed the presence of O, Ni, N, and C. The composite has an average particle size of 18 nm. Its surface area is 110.591 m²/g. It was found that the efficiency of dye removal by adsorption on NiO/PDA exceeded that of bare NiO. The adsorption capacity of NiO and NiO/PDA are 126 and 284 mg/g, respectively. The effects of adsorbent dose, dye concentration, and pH on the removal efficiency were examined. The efficiency increased with increasing the adsorbent dose and pH, but dropped from 85 to 73% within 30 min as the initial dye concentration was increased from 0.984 to 4.92 mg/L. Such a drop in the removal efficiency is due to the blocking of the surface-active sites of NiO/PDA, with the high population of dye molecules derived from the continuous increase in dye concentration. The adsorption results of the dye fitted well with the pseudo-second-order kinetics and Langmuir isotherm. The reusability data showed that NiO/PDA was stable across three adsorption–regeneration cycles, thus it can be considered a good recyclable and efficient adsorbent. Because of these results, it can be considered that this method can be applied for the treatment of wastewater. Full article

(This article belongs to the Special Issue Nanomaterial Application in Environmental Monitoring and Water Treatment)

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Special Issue "Nanomaterial Application in Environmental Monitoring and Water Treatment"

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