Application In Organic Degradation Research Articles

Preparation of Nanofibrous Membrane With rGO/TiO2 Photocatalyst and Its Application in Organic Degradation

In this study, rGO, AgNO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3,</sub> and Y-type zeolite is successfully added to TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> by sol-gel method, and one-dimensional nanofibers are prepared by electrospinning. The properties of the photocatalyst are analyzed by SEM and XRD. The results prove that nanofibers are successfully prepared, and rGO, AgNO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> and Y-type zeolite is all added to the composite materials we prepared. The photocatalyst nanofibers of each component are subjected to degradation tests under visible light. The results show that the photodegradation efficiency of the composite material with 0.3 g Y-type zeolite, 0.5 g AgNO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> and 2mL rGO solution can reach 79%.

Facile fabrication of triphenylamine-based conjugated porous polymers and their application in organic degradation under visible light

A facile fabrication method was developed for the one-pot synthesis of 1,3,5-triformylbenzene (TFB)-4,4′4′′-triaminotriphenylamine (TPA) and 1,3,5-triformylbenzene-terephthalaldehyde (TA) under ambient conditions via a Schiff-base reaction.

Cationic S-doped TiO2/SiO2 visible-light photocatalyst synthesized by co-hydrolysis method and its application for organic degradation

Cationic S-doped TiO2 (S-TiO2)/SiO2 photocatalyst with visible-light response was synthesized by a simple co-hydrolysis method with thiourea (CH4N2S) as sulfur source and tetraethoxysilane (TEOS) as Si source. The catalytic activity was evaluated through degradation of nitrobenzene, p‑chlorophenol, and phenol under ultraviolet, artificial visible and solar light irradiations. The separability of S-TiO2/SiO2 catalyst was determined by gravity sedimentation. XPS, FTIR, TEM, UV–Vis DRS, XRD, PL, and N2 adsorption-desorption isotherms were used for the characterizations of S-TiO2/SiO2. The results showed that S-TiO2/SiO2 with appropriate S doping displayed excellent activity under ultraviolet, artificial visible and solar light irradiations, was easily separated from contaminants, and had good reusability. The added sulfur source was incorporated in the lattice of TiO2 by partially replacing Ti4+ ions at the cationic site. TiO2 with S6+ doping formed a structure with new energy levels above the valence band of TiO2 to extend the adsorption edge to 400–550 nm and to increase the surface hydroxyl amount of TiO2. New bonding between the SiO2 and TiO2 was formed to avoid the TiO2 removal during the waste water treatment. The performance of our S-TiO2/SiO2 catalyst guarantees its great practical application for the organic pollutant-contaminated waste water treatment.

Fabrication of cerium doped Ti/nanoTiO2/PbO2 electrode with improved electrocatalytic activity and its application in organic degradation

In this work, the rare earth cerium (Ce) doped Ti/nanoTiO2/PbO2 electrode (Ti/Ce-nanoTiO2/Ce-PbO2) was successfully prepared using sol-gel and electrodeposition. It was found that the cerium doped nano TiO2 as underlayer could not only increase electrocatalytic property but could also withstand corrosion of the electrode. The surface morphology and the structure of the prepared thin film were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. SEM images indicated that the surface of Ti/Ce-nanoTiO2/Ce-PbO2 electrode was more uniform and had smaller particles. Cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were also used to study electrocatalytic activity of electrodes. The large electrochemical active surface area and small charge transfer resistance resulted in the high electrocatalytic activity of Ti/Ce-nanoTiO2/Ce-PbO2. Electrocatalytic oxidation of methyl orange (MO) as a model dye wastewater in aqueous solution was studied to evaluate the potential applications of this electrode in environmental science. The chemical oxygen demand (COD) removal and average current efficiencies were about 96.6% and 14.6% for degrading 50mgL−1MO at a current density of 50mAcm−2 and treatment time of 120min. The good electrocatalytic performance of Ti/Ce-nanoTiO2/Ce-PbO2 makes it a promising anode as low-cost dimensionally stable anodes (DSAs) for treatment of organic pollutants in aqueous solution.

Preparation of Ti/PTFE-F-PbO 2 Electrode with a Long Life from the Sulfamic Acid Bath and Its Application in Organic Degradation

A polytetrafluoroethylene (PTFE)-doped PbO 2 electrode on a Ti substrate was prepared by galvanostatic method from the sulfamic acid bath (Ti/PTFE-F-PbO 2-I) or nitric acid bath (Ti/PTFE-F-PbO 2-II). Scanning Electron Microscopy revealed that the Ti/PTFE-PbO 2-I electrode had a more regular morphology with smaller size crystals than the Ti/PTFE-F-PbO 2-II electrode. On the basis of the results of both the accelerated electrolysis test and the empirical formula for estimating the service life of an electrode, the service life of the Ti/PTFE-PbO 2-I electrode was predicted to be more than 7 years under conventional electrolysis conditions (0.1 A·cm −2). During the treatment of 4-chlorophenol- contaminated water, the Ti/PTFE-PbO 2-I anode showed both a good electro-catalytic activity and high electrochemical stability, exhibiting an excellent potential application.

A novel PbO 2 electrode preparation and its application in organic degradation

PTFE (polytetrafluoroethylene)-doped β-PbO 2 (PTFE-β-PbO 2) electrode on Ti base (Ti/PTFE-β-PbO 2) or on ceramic base (ceramic/PTFE-β-PbO 2) was prepared by electrodeposition. Its accelerated lifetime was tested in 9.0 mol/L H 2SO 4 solution under a current density of 100.0 A dm −2. The experimental results showed that PTFE-β-PbO 2 electrode had a longer lifetime than common β-PbO 2. PTFE inlayed in β-PbO 2 could weaken the inner stress of the coating and help to get a smoother coating. Ceramic/PTFE-β-PbO 2 electrode had a longer accelerated lifetime (about 1338 h) than Ti/PTFE-β-PbO 2 electrode (about 827 h). The characteristics of ceramic/PTFE-β-PbO 2 anode in treating 4-chlorophenol-contaminated water indicated that it exhibited both good electro-catalytic activity and high electrochemical stability. This electrode has, then, a strong potential for future applications.