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Water
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Photocatalytical Behavior of Metal NPs over Wastewater Treatment
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Photocatalytical Behavior of Metal NPs over 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: closed (28 February 2022) | Viewed by 7437

Special Issue Editors

Dr. Awais Ahmad

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Guest Editor
Department of Chemistry, University of Lahore, Lahore, Pakistan
Interests: nanomaterials; photocatalysis; energy applicatons; coated composite materials; biosensor; electrochemical sensor
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Shahid Hussain

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
Interests: MOS-MOF-MXene nanomaterials; gas sensors; electrochemical supercapacitors; Li-S batteries
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Muhammad Bilal

E-Mail Website
Guest Editor
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian 223003, China
Interests: environmental biotechnology/engineering; nanotechnology; biocatalysis; enzyme engineering; immobilization; bioremediation of hazardous and emerging pollutants; liquid and solid waste management – valorization of agro-industrial wastes

Special Issue Information

Dear Colleagues,

Process of photocatalysis involves green chemistry, because all energy obtained from photons are utilized into chemical energy. In last few decades, an increase in use of photoreactors was emerged. In present era several modifications were brought for designing a diversified modification in those materials from which semiconductors could be formed, with efficient activity to be employed for photocatalysis of heterogenous materials. Based on modification, band gap, composition and charge transfer process semiconductors to be used in photocatalysis are categorized into four types. These include Z scheme, solid solutions, intrinsic semiconductors and electrical junction created between variant materials termed as heterojunction type II. Photocatalysis involves phenomena of oxidation. In this process, semiconductors capable of photocatalytic activity deteriorate contaminants that are organic in nature. These photocatalysts include zinc oxide and titanium oxide etc. Along with semiconductors, the agent with oxidizing properties like oxygen and a light source was mandatory for effective catalysis. When metal NPs react using photocatalysis their visble driven force and catalytical ehaviour ehanced and they act as promsing catalyzing agents.

This sort of research clinchs the scientiest to work for wastewater treatment because in 21th century the major issue is water contamination. So due to its cost effective this method get more promising effects and results in field of wastewater treatment.  In this special issue we will consider the papers who really hits the terms based on photocatalysis and wastewater treatment.

Dr. Awais Ahmad
Prof. Dr. Shahid Hussain
Prof. Dr. Muhammad Bilal
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. 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

  • photocatalysis
  • metal oxide NPs
  • enviromental remediation
  • dye degradation
  • heavy metal removal
  • antibiotics removal

Published Papers (2 papers)

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Research

12 pages, 3149 KiB  
Article
Antioxidant and Organic Dye Removal Potential of Cu-Ni Bimetallic Nanoparticles Synthesized Using Gazania rigens Extract
by Umer Younas, Afzaal Gulzar, Faisal Ali, Muhammad Pervaiz, Zahid Ali, Safia Khan, Zohaib Saeed, Mukhtiar Ahmed and Asma A. Alothman
Water 2021, 13(19), 2653; https://doi.org/10.3390/w13192653 - 26 Sep 2021
Cited by 21 | Viewed by 2714
Abstract
Copper-nickel bimetallic nanoparticles (Cu-Ni BNPs) were fabricated using an eco-friendly green method of synthesis. An extract of synthesized Gazania rigens was used for the synthesis of BNPs followed by characterization employing different techniques including UV/Vis spectrophotometer, FTIR, XRD, and SEM. Spectrophotometric studies (UV-Vis [...] Read more.
Copper-nickel bimetallic nanoparticles (Cu-Ni BNPs) were fabricated using an eco-friendly green method of synthesis. An extract of synthesized Gazania rigens was used for the synthesis of BNPs followed by characterization employing different techniques including UV/Vis spectrophotometer, FTIR, XRD, and SEM. Spectrophotometric studies (UV-Vis and FTIR) confirmed the formation of bimetallic nanoparticles. The SEM studies indicated that the particle size ranged from 50 to 100 nm. Analysis of the BNPs by the XRD technique confirmed the presence of both Cu and Ni crystal structure. The synthesized nanoparticles were then tested for their catalytic potential for photoreduction of methylene blue dye in an aqueous medium and DPPH radical scavenging in a methanol medium. The BNPs were found to be efficient in the reduction of methylene blue dye as well as the scavenging of DPPH free radicals such that the MB dye was completely degraded in just 17 min at the maximum absorption of 660 nm. Therefore, it is concluded that Cu-Ni BNPs can be successfully synthesized using Gazania rigens extract with suitable size and potent catalytic and radical scavenging activities. Full article
(This article belongs to the Special Issue Photocatalytical Behavior of Metal NPs over Wastewater Treatment)
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12 pages, 4175 KiB  
Article
Photocatalytic Dye Degradation and Biological Activities of Cu-Doped ZnSe Nanoparticles and Their Insights
by V. Beena, S. L. Rayar, S. Ajitha, Awais Ahmad, Faiza Jan Iftikhar, Khamael M. Abualnaja, Taghrid S. Alomar, Mohmed Ouladsmne and Shafaqat Ali
Water 2021, 13(18), 2561; https://doi.org/10.3390/w13182561 - 17 Sep 2021
Cited by 21 | Viewed by 2925
Abstract
Environmental nanotechnology has received much attention owing to its implications on environmental ecosystem, and thus is promising for the elimination of toxic elements from the aquatic surface. This work focuses on Cu-doped ZnSe nanoparticles using the co-precipitation method. The synthesized Cu-doped ZnSe nanoparticles [...] Read more.
Environmental nanotechnology has received much attention owing to its implications on environmental ecosystem, and thus is promising for the elimination of toxic elements from the aquatic surface. This work focuses on Cu-doped ZnSe nanoparticles using the co-precipitation method. The synthesized Cu-doped ZnSe nanoparticles were examined for structural, optical, and morphological properties with the help of XRD, FTIR, UV/vis diffuse reflection spectroscopy (DRS), FESEM, TEM, and XPS. The synthesized Cu-doped ZnSe nanoparticles revealed the presence of Cu2+ in the ZnSe lattice, which has been shown to take a predominant role for enhanced catalysis in the Cu-doped ZnSe nanoparticles. The synthesized Cu-doped ZnSe nanoparticles were investigated for their catalytic and antibacterial activities. The 0.1 M copper-doped ZnSe nanoparticles exhibited the highest rate of degradation against the methyl orange dye, which was found to be 87%. A pseudo-first-order kinetics was followed by Cu-doped ZnSe nanoparticles with a rate constant of 0.1334 min−1. The gram-positive and gram-negative bacteria were used for investigating the anti-bacterial activity of the Cu-doped ZnSe nanoparticles. The Cu-doped ZnSe nanoparticles exhibited enhanced photocatalytic and antibacterial activity. Full article
(This article belongs to the Special Issue Photocatalytical Behavior of Metal NPs over Wastewater Treatment)
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