Synthesis and photocatalytic application of TiO 2 nanoparticles immobilized on polyacrylonitrile nanofibers using EDTA chelating agents

Enhanced photocatalytic degradation of organic dyes by ultrasonic-assisted electrospray TiO2/graphene oxide on polyacrylonitrile/β-cyclodextrin nanofibrous membranes

“…The removal rates may be affected by the overload of the nanofibrous membrane sites by large amounts of dye [26] , however. Chaúque et al reported the similar results [66] . They attributed the results to the high affinity of dye molecules for the surface of the calcined TiO 2 -ethylenediaminetetraacetic acid-ethylenediamine-PAN nanofibrous composites and the ROS generated on the surface of the nanofibrous composites due to UV radiation exposure.…”

“…The pH value of the solution affects the photocatalytic degradation of dye molecules from two aspects: i) the adsorption-desorption equilibrium of the dye molecule on the surface of nanofibrous membranes depends on pH, and ii) The pH value of the dye solution will affect the generation of reactive oxygen species (ROS) in the photocatalytic degradation of dyes on nanofibrous membranes, and it can also affect the adsorption capacity by changing the surface active site of the adsorbent materials and the aqueous chemistry of the dye molecule [66] . The PAN/β-CD/TiO 2 /GO composite nanofibrous membrane (TiO 2 :GO = 8:2, ultrasonic time = 45 min) was selected to evaluate the effect of pH value on the degradation rates of the MB and MO dyes ( Fig.…”

TiO2–Based Nanofibrous Membranes for Environmental Protection

“…To chemically attach the nanoparticles of titanium dioxide to the surface of nanofibers of polyacrylonitrile (PAN), Chaúque et al used ethylenediamine (EDA) and ethylenediaminetetraacetic acid (EDTA) as chelating agents. The accommodation of titanium dioxide nanoparticles attachment was achieved by reducing surface imines, amine, and carboxylic groups [91]. The attachment can be achieved by physico-chemical interactions, for example electrostatic attraction, hydrogen bonding, chelating and ester-like linkage, and bidentate bridging [91].…”

“…The accommodation of titanium dioxide nanoparticles attachment was achieved by reducing surface imines, amine, and carboxylic groups [91]. The attachment can be achieved by physico-chemical interactions, for example electrostatic attraction, hydrogen bonding, chelating and ester-like linkage, and bidentate bridging [91]. The improvement of methyl orange adsorption was achieved by the existence of combined electrostatic and non-electrostatic forces and thus, through photocatalytic degradation and adsorption the removal of methyl orange was improved [91].…”

Anatase Nanocrystals Covalently Functionalized with EDTA-diol: Interaction with Aromatic Sulfur

“…Functionalizing the nanoparticles’ surface is a common way to improve material properties due to the high energy and unsaturation of the surface bonds, providing ample ways to make new bonds with the organic ligands. The ligands can be bound to the metal oxides through coordinate/covalent bonds, hydrophobic interactions, electrostatic attraction, or van der Waals forces, depending upon the physical or chemical methods used to functionalize the nanoparticles’ surfaces. − The ligands can be bound to nanoparticles’ surface through physisorption or chemisorption. − The use of organic ligands, e.g., carboxylic acids, thiols, amines, alcohols (glycols, polyols), alkoxides, and silanes, to functionalize the surface prevents the cohesion of nanoparticles by forming a hydrophilic coating, as metal oxides tend to agglomerate due to the lack of stability and thus, they are unstable in an aqueous medium. − Another important aspect of surface functionalization is to render the nanoparticles’ surface compatible with biological phases, as most metal oxides are not intrinsically compatible with the biological systems . Thus, surface modification of the oxides increases dispersity, biostability, and biocompatibility.…”