Seven TiO2 morphologies were synthesized and evaluated for photocatalytic oxidation (PCO) of methyl ethyl ketone (MEK) in air. Photocatalysts were fabricated via hydrothermal method and the preparation parameters were adjusted to keep the variations in photocatalysts’ crystallinity, crystal composition, and surface area in narrow ranges, thus, allowing a better understanding of the morphology-performance relationship. Based on the characterization results and data available in literature, possible morphological evolutions for different structures were put forward. MEK removal efficiency improved in the order of solid spheres

Role of titanium dioxide (TiO2) structural design/morphology in photocatalytic air purification

https://digital.csic.es/bitstream/10261/202167/1/highmembrane.pdf

High-pressure CO2/CH4 separation of Zr-MOFs based mixed matrix membranes

Ti3C2 MXene-modified Bi2WO6 nanoplates for efficient photodegradation of volatile organic compounds

While the removal of gaseous formaldehyde in breathing air via photocatalytic oxidation technology (POT) has shown great promise for pratical applications, the search of highly efficient and stable catalysts and mechanistic interpretations are highly desirable We synthesized a core-shell structured composite of CeO2 and layered double hydroxides (CeO2@LDHs) The degradation of gaseous formaldehyde was realized with high efficiency under visible light irradiation using a home-built continuous flow reaction device at an industrial reaction scale It was confirmed that the catalytic activity of LDHs after CeO2 complexation was significantly improved Under optimum reaction conditions, a formaldehyde conversion of 869 % was achieved by CeO2@LDHs after 300 min equilibrium (373 μg g–1 h–1) Kinetic study showed that the flow rate of gaseous formaldehyde had the largest influence on the degradation rate of formaldehyde, followed by the relative humidity and the light intensity with a descending order The rate equation and activation energy of photocatalytic degradation of formaldehyde were also obtained and discussed The catalytically active radicals and the reaction intermediates were detected on CeO2@LDHs, shedding light on the intepretation of the reaction mechanism Under the oxidation of hydroxyl and superoxide radicals and hot holes, gaseous formaldehyde was eventually degraded into carbon dioxide and water, as a result of the generation of formic acid, carbon hydrogen oxygen radicals ( CHO) and CO2– radicals The present study demonstrates a systematic logical flow from design, preparation and mechanistic understanding of efficient LDHs-based photocatalyst for the degradataion of gaseous formaldehyde under practical conditions

Kinetic and mechanistic analysis for the photodegradation of gaseous formaldehyde by core-shell CeO2@LDHs

Hydrogen sulfide (H2S) is regarded as a broad-spectrum poison associated with severe health consequences. Among the available treatment options, photocatalytic technology may be effectively applied to the production of hydrogen gas through the splitting of H2S molecules and the addition of 79.9 kJ mol−1 of energy. As a result, advanced photo-reactive media may provide a win-win strategy to treat the parent pollutant (H2S) while producing hydrogen gas. This review encompasses both TiO2 and non-TiO2 catalysts capable of operating under ultraviolet, visible, and solar light irradiation. The performances of photocatalysts are assessed in terms of quantum yield, space-time yield, and other operational variables, including mode of operation, irradiation time, and relative humidity. The concept of space velocity is used to compare photocatalysts in reference to benchmark parameters for the treatment of H2S. This review addresses current limitations and future prospects of the application of photocatalytic technology to efficiently mitigate H2S pollution.

Mojtaba Malayeri

Papers

Feasibility study, simulation and economical evaluation of natural gas sweetening processes – Part 1: A case study on a low capacity plant in iran

Modeling of volatile organic compounds degradation by photocatalytic oxidation reactor in indoor air: A review

Modeling of gas-phase heterogeneous photocatalytic oxidation reactor in the presence of mass transfer limitation and axial dispersion

Kinetic modeling of the photocatalytic degradation of methyl ethyl ketone in air for a continuous-flow reactor

Modeling of photocatalytic oxidation reactor for methyl ethyl ketone removal from indoor environment: Systematic model development and validation