Synthesis of Fe- or Ag-doped TiO2–MWCNT nanocomposite thin films and their visible-light-induced catalysis of dye degradation and antibacterial activity

Fabrication, functionalization and performance of doped photocatalysts for dye degradation and mineralization: a review

“…Iron or silver was doped into the titanium dioxide-multiwalled carbon nanotubes composites, and the subsequent decrease of the energy band gap favoured a more pronounced photocatalytic degradation of methylene blue under visible light conditions. Hossain et al (2018) attributed the excellent catalytic photodegradation capacity of the Ag-TiO 2 -multiwalled carbon nanotubes and Fe-TiO 2 -multiwalled carbon nanotubes composites to the following mechanistic processes: (1) adsorption and photoinduced absorption of electrons by the multiwalled carbon nanotubes and (2) trapping of electrons by the iron or silver inside the TiO 2 matrix, in supplement to the usual photocatalytic characteristics of titanium dioxide. In a very recent study by Wei et al (2019), an N-doped carbon nanotubes-FePO 4 composite has been successfully prepared using phosphate residue using surface modification and chemical vapour deposition.…”

“…Therefore, continuous research and material science and engineering efforts are deployed to formulate such materials which can unleash much acceptable and superior photocatalytic degradation performances by encompassing more and more of the dyes contained within a specific multi-dye system. Moreover, synthetic modifications occur in the form of doping the parent catalyst with specific heteroatoms (Yao et al 2016;Pham and Yeom 2016;Di et al 2017;Zeng et al 2017;Cao et al 2017;Nguyen and Ngo 2018;Qian et al 2018), in combining the catalyst with other compounds to generate composites with enhanced and adjustable catalytic properties such as improved interfacial surface areas and more favourable band gaps (Tanwar et al 2017;Hossain et al 2018;Azzam et al 2019) and enhanced electronic movement (Hu et al 2015;Saleh et al 2016;Sankar et al 2016;Chai et al 2017;Bhanvase et al 2017;Qian et al 2018;Zeng et al 2018).…”

Modified Titanium Dioxide for Photocatalytic Applications

“…The 2.5 wt%Pt-TiO 2 had showed the optimum catalytic performance and a reduction in the TiO 2 band gap energy from 3.00 to 2.34 eV with an enhanced electron storage capacity, leading to a minimization of the electron-hole recombination rate [34]. Noble metal nanoparticles such as Ag [35], Pt [34], Pd [36], Rh [37] and Au [38] have also been used to modify TiO 2 for photocatalysis and have been reported to efficiently hinder electron-hole recombination due to the resulting Schottky barrier at the metal-TiO 2 interface. The noble metal nanoparticles act as a mediator in storing and transporting photogenerated electrons from the surface of TiO 2 to an acceptor.…”

Introductory Chapter: Fundamentals of Semiconductor Photocatalysis

“…Three-dimensional nanostructures have interconnected networks of bulk materials and larger accessible surface areas with respect to their lower dimensional counterparts. The surface functionalities, controllable host-guest interactions, and size-selective sensing properties are enabled due to the spatial arrangement of particles within three-dimensional framework [4][5][6][7][8][9][10][11][12][13][14][15].…”

“…To support particles of TiO 2 on mesoporous silica, maintaining or improving its photocatalytic activity is not an easy task as, in addition to be strongly attached to the substrate for avoiding leakage, nanoparticles' size, location, and agglomeration should be controlled to have accessibility for adsorbates and incident photons [19][20][21][22]. Nanostructure of rare earth material is appropriate for these applications that can be synthesized with different methods, for example co-precipitation, hydrothermal, sol-gel, combustion, stearic acid route, pechini, cathode plasma, electrolysis, co-ions complexation, molten salt, and other approaches [13]. Rare-earth-based materials were used in different fields.…”