Advanced Ceramics for Environmental Remediation: Session I
Sponsored by: ACerS Engineering Ceramics Division
Program Organizers: Alberto Vomiero, Lulea University of Technology; Elisa Moretti, Ca' Foscari University of Venice; Tofik Shifa, Ca'Foscari University of Venice; Clara Santato, Polytechnique Montreal
Monday 8:00 AM
October 10, 2022
Room: 411
Location: David L. Lawrence Convention Center
Session Chair: Elisa Moretti, Ca' Foscari University of Venice; Alberto Vomiero, Lulea University of Technology
8:00 AM Invited
2-D and Layered Oxides for Environmental Catalysis Applications: Scott Misture1; 1Alfred University
Oxide nanosheets derived from bulk layered oxides are promising for use in catalysis and energy storage. Starting from highly crystalline materials, we demonstrate that layered oxides can be activated via proton exchange or chemomechanically exfoliated to produce stable suspensions of nanosheets that can be flocculated through the addition of acids and salts. Homogeneous flocculation or gelation of the nanosheets yields either macroporous solids with surface areas reaching ~200 m2/g or mesoporous structures comprising primarily restacked nanosheets. Control over point defects becomes critical for tuning the photocatalytic and electrocatalytic kinetics. The talk will demonstrate how a range of 2-D or layered transition metal oxides can be optimized for various reactions related to hydrogen and CO2.
8:20 AM Invited
Dyes and Antibiotics Degradation through Advanced Inorganic Nanostructures: Progress and Limitations of a Materials Science Approach: Isabella Concina1; 1Luleå University of Technology
Testified by an impressive number of investigations, the seek for photoactive nanomaterials to be applied as catalysts for water remediation is engaging since long the community of materials scientists.This lecture focuses on the critical presentation of some recent results on semiconductor-supported catalysis and photocatalysis, with particular reference to core-shell metal oxides, Prussian blue analogues and metalorganic framework/microporous polymer composites, to degrade dyes and antibiotics. We will discuss aspects of materials design, catalytic performance analysis, role of light-induced reactive oxygen species. Emphasis will be given to analyze the successful leaps forward in materials architecture and pollutants removal, but also to point out at relevant limitations of the current approach to this field, strategic for the scientific community to contribute to find solutions to human-related environmental pollution.
8:40 AM Invited
Inorganic Materials for Phosphorus Capture and the STEPS Center: Jacob Jones1; 1North Carolina State University
Phosphorus (P) is key nutrient in fertilizers. Yet it is sourced from non-renewable resources, is inefficiently utilized, and accumulates in terrestrial systems such as soils and freshwater resources, causing harmful algal blooms and fish kills. Current technologies for removing environmental P are insufficient and have ill-defined impacts. For example, P can be scavenged from water with Phoslock® particles, but the long-term fate of P and La in the environment is unknown. Here, we introduce results from systematic immersion experiments of inorganic materials (e.g., metal oxides and carbonates) in synthetic and real wastewater aqueous matrices. Mechanisms of P capture are elucidated using interrupted XRD and TEM experiments. We will also introduce a recently-funded NSF Science and Technology Center, the Science and Technologies for Phosphorus Sustainability (STEPS) Center. STEPS is a convergence research center that addresses challenges in phosphorus sustainability by integrating disciplinary contributions across the physical, life, social, and economic sciences.
9:00 AM Cancelled
Multifunctional Materials for Emerging Technologies: Federico Rosei1; 1INRS Centre for Energy, Materials and Telecommunications
This presentation focuses on structure property/relationships in advanced materials, emphasizing multifunctional systems that exhibit multiple functionalities. Such systems are then used as building blocks for the fabrication of various emerging technologies. In particular, nanostructured materials synthesized via the bottom–up approach present an opportunity for future generation low cost manufacturing of devices. We focus in particular on recent developments in solar technologies that aim to address the energy challenge, including third generation photovoltaics, solar hydrogen production, luminescent solar concentrators and other optoelectronic devices. [1-22]. References[1] Adv.Func.Mater.22,3914(2012); [2] Chem.Comm.49,5856(2013); [3] Nature Phot.9,61(2015); [4] Nano Energy 27,265(2016); [5] Small 12,3888(2016); [6] Adv.En.Mater.6,1501913(2016); [7] Adv.Sci.3,1500345(2016); [8] Small 11,5741(2015); [9] J.Mater.Chem.A 3,2580(2015); [10] Nano Energy 34,214(2017); [11] Nano Energy 35,92(2017); [12] Adv.Func.Mater.27,1401468(2017); [13] Adv.En.Mater.8,1701432(2018); [14] Nature Phot.12,271(2018); [15] Nano Energy 55,377(2019); [16] Appl.Cat.B 250,234(2019); [17] Adv.Func.Mater.29,1904501(2019); [18] Appl.Cat.B 264,118526(2020); [19] Adv.Func.Mater.30,1908467(2020); [20] J.Mater.Chem.A 8,20698(2020); [21] Nano Energy 79,105416(2021); [22] Nano Energy 81,105626(2021).
9:20 AM
Greener Synthesis of Porous Two-dimensional Nanomaterials and Their Applications in Water Treatment: Bhavya Joshi1; Fayyaz Memon1; Khalil Ahmed1; Shaowei Zhang1; 1University of Exeter
Two-dimensional (2-D) nanomaterials have found their applications in water-treatment , due to their exceptional specific surface area, and superior biological, mechanical, and physio-chemical properties. However, the reagents used for their synthesis are noxious to human health and hazardous to environment. This study reports on two greener approaches based on “Encapsulation” and “Hydrothermal Treatment”, to the synthesis of graphene and 2-D-nano-sized MoS2 , respectively. Both of the materials synthesised were tested against organic dyes and other emerging contaminants and showed 96% rhodamine-b dye removal and 85% Ciprofloxacin removal. Detailed batch tests were done to examine the effects of adsorption time, adsorbent dosages, solution Ph and temperature. Adsorption mechanism was also investigated via thermodynamic calculations, adsorption kinetics, and isotherm modelling. The results indicated that the two 2-D nanomaterials prepared using the greener methods reported here could be potentially used as promising adsorbents for removal of organic pollutants from waste-water.
9:40 AM Invited
Optimization of 1D Core-shell Heterostructures for Gas Sensing: Nicola Pinna1; 1Humboldt-Universitaet Zu Berlin
Hierarchical core-shell heterostructures composed of p-,n-type and insulating metal oxide shells deposited onto carbon nanotubes (CNTs) were synthesized using atomic layer deposition. Precisely controlled films of alternating metal oxides were uniformly deposited onto the inner and outer walls of the CNTs.The morphological, microstructural and electrical characteristics of the as prepared core-shell heterostructures were thoroughly investigated. The electrical resistance measurements highlighted the large influence of the metal oxides thickness and charge carriers types on increasing of many order of magnitude the baseline resistance of the core-shell heterostructures with various thicknesses of the metal oxide shell layers, suggesting that the conductivity of the sensors is dominated by Schottky barrier junctions across the n-p interfaces.The behavior of our sensors was investigated for low concentrations of volatile organic compounds and pollutants.The gas sensing response of the heterostructures showed a strong dependence on the thickness of the metal oxide shell layers and the typeof heterostructures...
10:00 AM Break
10:20 AM Invited
Utilizing Band Diagrams to Engineer the Performance of Photocatalytic Processes: Kirk Bevan1; Botong Miao1; Asif Iqbal1; 1McGill University
In this talk we present an overview of the crucial role that semiconductor band diagrams can play in understanding and engineering photocatalytic systems. Focusing on the photo-anode, we begin by exploring how the operation of semiconductor/oxide based photocatalytic devices can be understood in a similar framework to solid-state Schottky diodes. From this it is then demonstrated how photocatalysis operates as a competition between recombination and reaction processes. We shall then briefly explore how this modeling approach can be utilized to understand the operation of photocatalytic devices. We will consider a recent case study, combining both theory and experiment, regarding the impact of surface oxidation on the interfacial operation of tantalum nitride photoanodes. Finally, we close by discussing how these insights can be applied towards engineering environmental chemistry associated applications.
10:40 AM
Nanofibrous Oxide Ceramics: Manufacturing and Applications: Riley Yager1; Rachel Day1; Tabitha Berry1; Arielle Griffin1; Andrei Stanishevsky1; 1University of Alabama at Birmingham
This presentation discusses recent developments in fabrication and applications of highly porous nanofibrous ceramic (NFC) materials in catalysis, filtration, thermal insulation, sensors, and other applications. Fabrication of NFC shapes with tailored microarchitecture and properties represents the major challenge in their technology. The use of high-yield, scalable spinning methods can address those challenges and increase the efficiency of nanofibers production. Several NFC systems with 76–99.97% porosity are discussed in details, including nanocrystalline zirconia/titania and alumina/silica nanofibrous materials with different compositions that have been prepared from precursor fibers obtained by an uncommon, high-throughput, free-surface alternating force electrospinning process. The pecularities of NFC materials calcination and sintering protocols are reviewed. The study shows, in part, that highly porous NFC can be prepared at relatively low sintering temperatures and exhibit good mechanical durability, machinability, thermal and chemical stability in flat and tubular membrane structures for various catalytic schemes.