Doping of Chlorine from a Neoprene Adhesive Enhances Degradation Efficiency of Dyes by Structured TiO2-Coated Photocatalytic Fabrics

Abstract

We demonstrate that using neoprene as a binder during the fabrication of TiO2-coated fabrics enhances the rates of photodegradation of dyes by the fabrics. The neoprene binder simultaneously modifies the surface of the TiO2 particles with Cl and dopes the TiO2 with Cl, without requiring high temperatures or other harsh laboratory treatments. The adsorption of chlorine on the surface and doping of the lattice with chlorine were confirmed by X-ray photoelectron spectroscopy. The chloride ions adsorbed onto the TiO2 surface introduces a negative surface charge that enhances electrostatic adsorption of cationic dyes, and greatly improves the self-sensitizing degradation performance of the dyes. Chloride ions replace lattice oxygen atoms in TiO2, inducing lattice oxygen vacancies, that reduce the apparent band gap of the TiO2 particles, enhancing its absorption of visible light, and further increasing the photocatalytic activity of the composite-coated fabric. The degradation rates of RhB and MB over 50 min were 95.2% and 96.0%, respectively. The degradation rate for MO reached 95.4% after 180 min. We also show that •OH and •O2− are active agents in the dye-degradation mechanism. Moreover, the photocatalytic performance of the composite-coated fabric was unchanged after eight cycles of photocatalytic degradation of RhB, demonstrating that the photocatalyst-coated fabrics was highly recyclable.

Magnetic Graphene Oxide/Chitin Nanocomposites for Efficient Adsorption of Methylene Blue and Crystal Violet from Aqueous Solutions

“…5,6 Substantially, most of the cationic dyes are difficult to degrade because of their aromatic structure and xenobiotic properties that are related to mutagenic and carcinogenic properties. 7 Certainly, scientific research communities have developed numerous technologies such as biological processes, membrane processing, advanced oxidation processes, chemical and electrical techniques, coagulation, chemical precipitation, and adsorption for the removal of dyes from water effluents. 8−13 Adsorption in comparison to other techniques is a more efficient and non-destructive approach, owing to its low consumption of energy, simple design and operation, high efficiency, environmental friendliness, and cost-effective nature.…”

Impact of Reaction Parameters and Water Matrices on the Removal of Organic Pollutants by TiO2/LED and ZnO/LED Heterogeneous Photocatalysis Using 365 and 398 nm Radiation

“…The very slow conversion [ 82 ] and its negligible h VB + scavenging effect of Cl − in TiO 2 suspensions were reported [ 38 ]. Opposite to the TiO 2 , the Cl − are adsorbed well on the ZnO surface, having a positive charge [ 83 , 84 , 85 ] and enhancing the formation rate of ROS due to the hindered recombination of photoinduced e CB − and h VB + [ 83 ]. Significant conversion of Cl − by h VB + to HClO has been reported in some cases [ 82 , 86 , 87 ].…”

Visible light photocatalytic degradation of organic dyes using W‐modified TiO2/SiO2 catalyst

“…This implies that the dyes are continuously degraded during the photocatalytic processes through the chromophore destruction. [39,42] The TOC test is also used to examine the MB, RhB, MO and CR dyes mineralization during photocatalytic decomposition (Figure 11). With initial equal concentrations of 40 mg.L -1 MB, RhB, MO and RhB dyes, after 60 minutes of dark adsorption, the equilibrium of the dyes was determined as 18.85 mg.L -1 , 22.09 mg.L -1 , 22.12 mg.L -1 and 28.74 mg.L -1 which correspond to TOC0e values of 11.97 mg.L -1 , 17.76 mg.L -1 , 10.18 mg.L -1 and 502.95 mg.L -1 .…”