Abstract
There is an increased interest in recycling valuable waste materials for usage in procedures with high added values. Silica microparticles are involved in the processes of catalysis, separation, immobilization of complexants, biologically active compounds, and different nanospecies, responding to restrictive requirements for selectivity of various chemical and biochemical processes. This paper presents the surface modification of accessible and dimensionally controlled recycled silica microfiber with titanium dioxide. Strong base species in organic solvents: methoxide, ethoxide, propoxide, and potassium butoxide in corresponding alcohol, activated the glass microfibres with 12–13 µm diameter. In the photo-oxidation process of a toxic micro-pollutant, cyclophosphamide, the new composite material successfully proved photocatalytic effectiveness. The present work fulfills simultaneously two specific objectives related to the efforts directed towards a sustainable environment and circular economy: recycling of optical glass microfibers resulted as waste from the industry, and their usage for the photo-oxidation of highly toxic emerging micro-pollutants.
Highlights
There is an increased interest in recycling valuable waste materials for usage in procedures with high added values
We propose to re-use silica microfibers – a valuable waste from the optical glass fibers industrial facilities, as support material for titanium dioxide to obtain a composite material through the sol-gel method: silica microfibers with adherent titanium dioxide deposits
The quartz microfibers used in this study represent a technical-economically accessible source being a by-product of the silica fiber industry whose use for obtaining advanced materials dedicated to various physicochemical processes: selective separations, controlled adsorption, combustion cells or photo-oxidation reactors would be a niche of valorization
Summary
There is an increased interest in recycling valuable waste materials for usage in procedures with high added values. Mainly known as an anticancer drug, cyclophosphamide is administrated frequently as an anti-inflammatory or immunolytic agent for rheumatoid arthritis[19], or nephrotic syndrome[20], systemic lupus erythematosus[21], or systemic sclerosis lung fibrosis[22] This important cytostatic compound administrated for autoimmune diseases, and cancer chemotherapy, as well as its metabolites, are released into effluents that reach surface and ground waters[23]. When the oxidative forces imbalanced the antioxidant system action of the body, oxidative stress occurs Such a detrimental body state is due to the presence of free radicals generated by the reactive oxygen metabolites. In the case of excess production of such highly reactive and unstable radicals, the body antioxidant defense mechanism is overwhelmed by the reactive oxygen species presence and the oxidative stress occurs[27]. The usage of cyclophosphamide was proved to generate oxidative stress, inducing cell apoptosis[26]
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