3D Printing of Photocatalytic Filters Using a Biopolymer to Immobilize TiO₂Nanoparticles

Abstract

Titanium oxide-based photocatalytic filters were produced by Fused Deposition Modelling (FDM) using biopolymers obtained from renewable biomass resources. The thermoplastic route allows shaping composites through the immobilization of photoactive TiO 2 nanoparticles in an environmentally friendly bioplastic such as the polylactic acid (PLA). Composites with an inorganic charge of 30 wt% of TiO 2 nanoparticles (NPs) exhibit a 100% methyl orange (MO) degradation after 24 h of light exposition due to the extremely uniform dispersion of the nanophase within the polymer matrix in the FDM feedstock. Surface modification of TiO 2 NPs allows the optimization of the colloidal dispersion and stabilization of the inorganic charge in a PLA solution and hence, the optimal distribution of nano-photoactive points in the TiO 2 /PLA filaments and scaffolds. The proposed new route of processing improves the dispersion of nano-charges comparing with the traditional thermo-pressing routes used for mixing thermoplastics based composites, avoiding the thermal degradation of the polymer and providing a customised product. In this manuscript the evolution of photodegradation with the increase of TiO 2 content in the composite and the variation of the filter geometry was evaluated.

3D Printed Palladium Catalyst for Suzuki‐Miyaura Cross‐coupling Reactions

“…The technology of additive manufacturing, broadly known as three‐dimensional (3d) printing, has been evolving extensively in the last decades, and recently catalytically active 3d printed objects started to emerge . Indeed, 3d printing provides potential for creating objects not only with desired catalytic properties, but at the same time with required shapes, e. g. for batch or flow reactors with heterogeneous solid catalysts.…”

“…Indeed, 3d printing provides potential for creating objects not only with desired catalytic properties, but at the same time with required shapes, e. g. for batch or flow reactors with heterogeneous solid catalysts. A number of reports emerged recently on new catalysts for various reactions, produced by 3d printing with and without chemical post‐processing of the printed objects. Among these reports, the majority utilizes fused deposition modelling (FDM) or robocasting, selective laser melting (SLM), and in some cases stereolithography (SL) methods.…”

Metal 3D printing technology for functional integration of catalytic system

“…Recently, several research groups have also made considerable progress in catalyst preparation and reactor design 7 , 8 , 14 – 30 . The 3D printing techniques, such as direct ink writing (DIW) 15 – 24 , 28 , fused deposition modeling (FDM) 14 , 16 , 26 – 28 , stereolithography (SLA) 29 and selective laser sintering (SLS) 30 , were employed and developed to print the functional catalysts or reactors. The printed catalysts or reactors have exhibited many new and exciting trends for chemical synthesis and analysis.…”

“…1a) [4][5][6][7][8][9][10][11][12][13][14] . Recently, several research groups have also made considerable progress in catalyst preparation and reactor design 7,8,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] . The 3D printing techniques, such as direct ink writing (DIW) [15][16][17][18][19][20][21][22][23][24]28 , fused deposition modeling (FDM) 14,16,[26][27][28] , stereolithography (SLA) 29 and selective laser sintering (SLS) 30 , were employed and developed to print the functional catalysts or reactors.…”

Controlled SrR Delivery by the Incorporation of Mg Particles on Biodegradable PLA-Based Composites

“…Among the most cutting-edge preparation strategies for composite biomaterials, the colloidal route is an excellent alternative since it allows controlling the dispersion of the particles in the polymeric matrix during shaping, which enhances the final properties of the microstructures [ 27 , 28 ]. The colloidal approach is based on the control of the interparticle forces in the liquid media, which implies significant advantages in terms of correct phase distribution and final homogeneity of a composite.…”