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Photocatalytic Nanoporous Thin Films
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Photocatalytic Nanoporous Thin Films

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 8446

Special Issue Editor

Dr. Ivana Grčić

E-Mail Website
Guest Editor
Faculty of Geotechnical Engineering, Department for Environmental Engineering, University of Zagreb, Hallerova Aleja 7, HR-42000 Varaždin, Croatia
Interests: advanced oxidation processes, water and wastewater treatment; environmental photocatalysis; chemical engineering; chemical kinetics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to introduce this Special Issue on “Photocatalytic Nanoporous Thin Films“.

Recent developments in photocatalytic coatings have pointed toward the paramount importance of further research and a shifting focus on scarcely covered aspects to achieve a desired technology readiness level. Driven by the current state of thin film development for photocatalytic degradation of water- and air-borne pollutants, the need to achieve high surface area, high catalyst load, optimal optical properties for application under solar irradiation, durability, and perfect adhesion at selected support have created certain demands for experimental and modeling activities.

This Special Issue will serve as a forum for papers in the following concepts:

  • Theoretical and experimental research, knowledge, and new conceptual design of photocatalytic nanoporous thin films;
  • Theoretical and numerical study of optical properties of photocatalytic thin films, including intrinsic phenomena of photon absorption and scattering; computer modeling and simulation to predict coating properties, performance, durability, and reliability in different environments;
  • Experimental study of water-borne pollutant degradation using photocatalytic thin films focused on either emerging contaminants or state-of-the-art photocatalytic reactors;
  • Experimental study related to air purification of various indoor and outdoor pollutants;
  • Development of complex mathematical models for pollutant degradation over irradiated photocatalytic thin films; including photon absorption rate, hydrodynamics and mass transfer consideration, yielding the intrinsic reaction rate constants necessary for scale-up;
  • Environmental risk analysis and life-cycle assesment for both real and hypothetical application of photocatalytic nanoporous thin films in various environments over a long period of time, considering the overall success of pollutant minimization due to applied techniques, waste production, and secondary pollution due to nanoparticle release or undesired reaction pathways, costs and other relevant information.

Dr. Ivana Grčić
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. Coatings is an international peer-reviewed open access monthly 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

  • thin films with enhanced activity
  • photocatalytic degradation of water- and air-borne pollutants
  • photon absorption and scattering in thin films
  • modeling and simulations
  • environmental aspects of nanoporous thin films

Published Papers (4 papers)

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Research

14 pages, 3024 KiB  
Article
Photocatalytic Oxidation of Amoxicillin in CPC Reactor over 3D Printed TiO2-CNT@PETG Static Mixers
by Kristina Miklec, Ivana Grčić, Lucija Radetić, Ivan Karlo Cingesar and Domagoj Vrsaljko
Coatings 2023, 13(2), 386; https://doi.org/10.3390/coatings13020386 - 08 Feb 2023
Cited by 2 | Viewed by 1899
Abstract
Antibiotics present common pollution in the environment, and they are often found in surface waters. Their presence or decomposition in water under natural sunlight can cause different unwanted consequences on the environment. In this paper, we report the application of 3D printed photocatalysts [...] Read more.
Antibiotics present common pollution in the environment, and they are often found in surface waters. Their presence or decomposition in water under natural sunlight can cause different unwanted consequences on the environment. In this paper, we report the application of 3D printed photocatalysts shaped as helix static mixers for tentative photocatalytic oxidation of antibiotic amoxicillin. The research was carried out in laboratory conditions in a semi-pilot-scale compound parabolic reactor (CPC) with static mixers made from PETG with TiO2 and MWCNT as fillers. The efficiency of 3D printed photocatalysts was evaluated in terms of amoxicillin decomposition kinetics using a pseudo-first-order kinetic model. The experimental results of amoxicillin decomposition and generated by-products were analyzed by using the Q-TOF LC/MS technique and presented using MassHunter Workstation. Full article
(This article belongs to the Special Issue Photocatalytic Nanoporous Thin Films)
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10 pages, 4367 KiB  
Article
Cathode Interlayer Engineering for Efficient Organic Solar Cells under Solar Illumination and Light-Emitting Diode Lamp
by Iacopo Sîm Benesperi
Coatings 2022, 12(6), 816; https://doi.org/10.3390/coatings12060816 - 10 Jun 2022
Cited by 2 | Viewed by 1914 | Retraction
Abstract
Organic solar cells (OSCs) have become a potential energy source for indoor light harvesting in recent years as they have witnessed a record power conversion efficiency (PCE) of over 30% under indoor lights. Among various strategies, interlayer engineering is one of the important [...] Read more.
Organic solar cells (OSCs) have become a potential energy source for indoor light harvesting in recent years as they have witnessed a record power conversion efficiency (PCE) of over 30% under indoor lights. Among various strategies, interlayer engineering is one of the important factors in improving the performance of OSCs. Here, we reported an efficient OSC based on PM6:Y6 photoactive layer showing an excellent PCE of ~22% and ~14% under light-emitting diode (LED, 1000-lx) and 1-sun (AM1.5 G) conditions, respectively. The performance of OSCs was optimized by systematically investigating the optical, electrochemical, and morphological characteristics of three different cathode interlayers (CILs) named as: PEIE, ZnO, and ZnO/PEIE (bilayer). The high transmittance (~90%), suitable work function (~4.1 eV), and improved surface morphology (RMS: 2.61 nm) of the bilayer CIL contributes in improving the performance of OSCs. In addition, the suppressed charge recombination and improved charge carrier transport are attributed to high shunt resistance and appropriate energy levels alignment between photoactive layer and bilayer CIL. The findings in the study might provide guidelines for designing novel interlayers in the development of efficient OSCs for different illumination conditions. Full article
(This article belongs to the Special Issue Photocatalytic Nanoporous Thin Films)
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15 pages, 1976 KiB  
Article
Dual Use of Copper-Modified TiO2 Nanotube Arrays as Material for Photocatalytic NH3 Degradation and Relative Humidity Sensing
by Tihana Čižmar, Ivana Grčić, Mario Bohač, Marta Razum, Luka Pavić and Andreja Gajović
Coatings 2021, 11(12), 1500; https://doi.org/10.3390/coatings11121500 - 06 Dec 2021
Cited by 7 | Viewed by 2339
Abstract
In this paper, we emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and a relative humidity sensor. The TiO2 nanotube arrays were obtained by anodization of the titanium layer prepared using radio frequency magnetron sputtering (RFMS) [...] Read more.
In this paper, we emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and a relative humidity sensor. The TiO2 nanotube arrays were obtained by anodization of the titanium layer prepared using radio frequency magnetron sputtering (RFMS) and modified with different copper concentrations (0.5, 1, 1.5, and 2 M) by a wet-impregnation method. The sample modified with 2 M Cu(NO3)2 solution showed the highest efficiency for the NH3 photocatalytic degradation and the most pronounced humidity response in comparison to the other studied samples. In order to investigate the structure and impact of Cu modification, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) were used. The photocatalytic activity and the kinetic study of ammonia oxidation were studied in a mini-photocatalytic wind tunnel reactor (MWPT), while relative humidity sensing was examined by impedance spectroscopy (IS). Higher NH3 oxidation was a direct consequence of the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation, which is correlated with the increase in the DC conductivity. Full article
(This article belongs to the Special Issue Photocatalytic Nanoporous Thin Films)
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12 pages, 3284 KiB  
Article
A Novel Accelerated Aging Test for Floats in a Floating Photovoltaic System
by Chun-Kuo Liu, Zhong-Ri Kong, Ming-Je Kao and Teng-Chun Wu
Coatings 2021, 11(11), 1283; https://doi.org/10.3390/coatings11111283 - 21 Oct 2021
Viewed by 1659
Abstract
Countries around the globe have recently been actively developing a new type of solar power system known as the floating photovoltaic (FPV) system. The FPV system is advantageous in terms of efficiency and is economic; however, the environmental conditions on the surface of [...] Read more.
Countries around the globe have recently been actively developing a new type of solar power system known as the floating photovoltaic (FPV) system. The FPV system is advantageous in terms of efficiency and is economic; however, the environmental conditions on the surface of water are harsher than on the ground, and regulations or standards of the long-term durability of the float are insufficient. As a result, this study aims to investigate the durability of the float through three types of accelerated aging tests, including the damp heat test, the ozone-aging test, and the ultraviolet (UV) aging test. After the 7-day damp heat test (80 °C/95% RH), the results revealed that four groups of high-density polyethylene (HDPE) extrusion specimens neither produced more oxygen-containing functional groups, according to Fourier-transform infrared (FTIR) spectrum analysis, nor became more easily broken by the tensile test. Furthermore, more oxygen-containing functional groups were produced after the 7-day ozone-aging test (80 °C/95% RH/500 ppm) than the 17-day UV-aging test (60 °C/0% RH/60 kW·h·m−2). On the contrary, UV aging would make HDPE specimens harder and more brittle than ozone aging. To conclude, both ozone- and UV-aging tests can evaluate the durability of the float quickly and efficiently. Full article
(This article belongs to the Special Issue Photocatalytic Nanoporous Thin Films)
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