Disclosed is a visible light-activated photocatalytic coating composition comprising a visible light active photocatalytic material and an aqueous solvent.

Disclosed is a catalytic system for the reduction of carbon dioxide to carbon monoxide. The catalytic system includes an iridium (Ir) photosensitizer and a TiO.sub.2/Re(I) complex catalyst. No additional process is required to anchor the molecule-based dye compound on TiO.sub.2 in the synthesis of the catalytic system. This enables the synthesis of the catalytic system in a relatively easy manner for groups of photosensitizer candidates. In addition, the catalytic system can be utilized as a platform for more easily evaluating the abilities of photosensitizers. Furthermore, the catalytic system can find application in various fields due to its ability to selectively produce carbon monoxide gas with high efficiency.

The invention provides a solid material for air purification and disinfection and a preparation method and application thereof. The solid material includes: 50-60 wt. % of inorganic porous materials, 10-20 wt. % of nano titanium dioxide, 3-5 wt. % of fluorescent materials, 20-30 wt. % of sodium chlorite, 3-5 wt. % of sodium lignosulfonate, 1-10 wt. % of polyethylene glycol, and 1-10 wt. % of polyvinyl alcohol. The method for preparing the solid material includes: formulating the fluorescent material into a slurry by using a polyethylene glycol aqueous solution; uniformly mixing the nano titanium dioxide, the sodium lignosulfonate, and the fluorescent material formulated into the slurry, and then spraying the mixture on an inorganic porous material carrier to be uniformly adsorbed; and mixing the sodium chlorite with the above mixture for granulation to obtain the product. The solid material for air purification of the invention can be stored stably for a long time, and chlorine dioxide gas slowly released can degrade harmful substances in the air such as formaldehyde and kill bacteria in the air.

The present invention provides a joint method of cultivating microalgae combined with denitrating an industrial waste gas and a system useful for the same. The joint method comprises the steps of: (1) a step of cultivating microalgae; (2) a separation step of separating a microalgae suspension obtained from step (1) into a wet microalgae (microalgae biomass) and a residual cultivation solution; (3) a NOx absorbing/immobilizing step of denitrating an industrial waste gas with the residual cultivation solution obtained from step (2); wherein the nutrient stream absorbed with NOx obtained from step (3) is used to provide nitrogen source to the microalgae cultivation of step (1). During the microalgae cultivation, EM bacteria is added into the microalgae suspension. The microalgae is preferably Chlorella sp., Scenedesmus sp., Monoraphidium sp. or Spirulina sp.

A substance is treated using a device having: (a) a volute or cyclone head, (b) a throat connected to the volute or cyclone head, (c) a parabolic reflector connected to the throat, (d) a first wave energy source comprising a first electrode within the volute or cyclone head that extends through the outlet into the opening of the throat along the central axis, and a second electrode extending into the parabolic reflector and spaced apart and axially aligned with first electrode, and (e) a second wave energy source disposed inside the throat, embedded within the throat or disposed around the throat. The substance is directed to the inlet of the volute or cyclone head and irradiated with one or more wave energies produced by the first and second wave energy sources as the substance passes through the device.

A photocatalyst filter is provided. The photocatalyst filter includes: a base in which an internal space is formed. The internal space is permeable to fluid, and a plurality of photocatalyst beads are provided in the internal space, wherein a surface of the internal space is reflective.

The present invention relates to method for converting a sulfide of the following formula (I), such as yperite: R.sup.1SR.sup.2 (I) wherein R.sup.1 and R.sup.2, identical or different, are a (C.sub.1-C.sub.3)alkyl, (C.sub.2-C.sub.3)alkenyl, aryl, aryl-(C.sub.1-C.sub.3)alkyl, or aryl-(C.sub.2-C.sub.3)alkenyl group, said group being optionally substituted by one or several groups selected from a halogen atom, OR.sup.3, and NR.sup.4R.sup.5, and R.sup.3, R.sup.4, and R.sup.5 are, independently of one another, H or a (C.sub.1-C.sub.3)alkyl; into a sulfoxide of the following formula (II): R.sup.1SOR.sup.2 (II) wherein R.sup.1 and R.sup.2, are as defined above, wherein said method comprises oxidizing the sulfide of formula (I) in the presence of a catalyst. under an atmosphere comprising dioxygen, and under white or blue light irradiation, wherein the catalyst has the following formula (I): wherein Ar.sup.1, Ar.sup.2, Ar.sup.3, and Ar.sup.4 are, independently of one another, an aryl group optionally substituted by one or several groups selected from halogen, a (C.sub.1-C.sub.3)alkyl, OR.sup.6, and NR.sup.7R.sup.8, and R.sup.6, R.sup.7, and R.sup.8 are, independently of one another, H or a (C.sub.1-C.sub.3)alkyl. The present invention relates also to an air-filtering device comprising a catalyst of formula (I).

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The invention relates to a method for the production of a TiO.sub.2 material comprising: preliminary mixing a titanium alkoxide with an acid; adding water, a phase separator and of an N source to the mixture thereby obtaining a TiO.sub.2 gel; washing the TiO.sub.2 gel with isopropanol; drying and calcining the TiO.sub.2 gel to produce the material. The invention also relates to a TiO.sub.2 material exhibiting an absorbance in the visible spectrum and in particular a light absorption at 500 nm which is greater than 50% of the light absorption at 400 nm, and its use as photocatalyst for the degradation of pollutants in air or water and water splitting into H.sub.2, under radiation in the visible spectrum.

The present disclosure provides a photocatalyst filter that can efficiently decompose and eliminate ozone gas or VOC and has a low ventilation resistance. The photocatalyst filter includes a sheet-like filter substrate and a photocatalyst layer supported by the filter substrate. The photocatalyst layer exhibits a photocatalytic action by receiving light having a wavelength of 400 nm or more. The photocatalyst filter has an aperture ratio of 35% or more and 80% or less.

Some embodiments relate to the novel use of aerodynamic airfoil wing profiles in general and specifically aerodynamic horizontal wind turbine wings (wings or blades) covered with catalytic materials as an open-air catalytic reactor, and in particular as a scalable and effective means for atmospheric air treatment and removal of pollutants and other harmful gases. The catalytic material interacts with pollutants as air flows over the airfoil. The aerodynamic shape and the airflow pattern over such a shape increases the likelihood of a catalytic reaction. In addition, the typical use of airfoil wings is with air flowing over them. This is certainly the case in airfoil wings of wind turbines. The movement of the blades in huge quantities of air allows for effective processing of significant air volumes and thus a reduction of large quantities of harmful gases.