The invention relates to a device and to a method for sequestering atmospheric carbon dioxide using at least one air capture module in conjunction with a biorcactor equipped with an autotrophic microorganisms.

The present invention provides a process of cultivating microalgae and a joint method of same jointed with denitration. During the microalgae cultivation, EM bacteria is added into the microalgae suspension. In the nutrient stream for cultivating microalgae, at least one of the nitrogen source, phosphorus source and carbon source is provided in the form of a nutrient salt. During the cultivation, the pH of the microalgae suspension is adjusted with nitric acid and/or nitrous acid. The joint method includes (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; and (3) a NOx absorbing/immobilizing step of denitrating an industrial waste gas with the residual cultivation solution obtained from step (2). The nutrient stream absorbed with NOx obtained from step (3) is used to provide nitrogen source to the microalgae cultivation of step (1).

Polymeric film of a semi rigid nature and with low opacity that contributes to environmental detoxification through the inclusion of titanium dioxide particles. It features photocatalytic properties within the range of visible light. The film permits the coating of surfaces such as windows by adhering to them and is thus easily removable. Versions in which the film includes at least one layer with electrochromic properties have been developed. It is intended for the chemicals and construction sectors.

The invention discloses a composite material used for catalyzing and degrading nitrogen oxide and its preparation method and application thereof. The invention of the hollow g-C.sub.3N.sub.4 nanospheres/reduced graphene oxide composite-polymer carbonized nanofiber material is prepared as follow: 1) the preparation of silica nanospheres; 2) the preparation of hollow g-C.sub.3N.sub.4 nanospheres; 3) the preparation of graphene oxide; 4) the preparation of surface modified hollow g-C.sub.3N.sub.4 nanoparticles preparation; 5) the preparation of composites; 6) the preparation of composite-polymer carbon nanofiber material. The raw materials used in the process is low cost and easy to get; the operation of the invention is simple and convenient without the use of expensive equipment in the whole process; the composite has high adsorption efficiency of ppb level nitrogen oxide with good repeatability.

An LED purifying and energy-saving lamp comprises a lamp body, a heat radiator, a light source assembly and an air purifying device, wherein the lamp body comprises a main body portion, an overflow table and a plurality of connecting blocks; the heat radiator, the light source assembly and the air purifying device are provided in the main body portion; the air purifying device is provided above the heat radiator; the light source assembly is provided inside the heat radiator; the upper part of the main body portion is connected to the bottom edge of the overflow table via the plurality of connecting blocks; the main body portion, the overflow table and the connecting blocks define a plurality of air outlets; and a shunting spur is convexly provided at the bottom of the overflow table toward the interior of the main body portion.

It is possible to obtain a visible light-responsive photocatalytic nanoparticle dispersion liquid containing copper-containing titanium oxide nanoparticles by subjecting an aqueous peroxotitanic acid solution containing a copper compound to hydrothermal reaction for crystallizing the aqueous solution by means of heat under high pressure. The visible light-responsive photocatalytic nanoparticle dispersion liquid thus obtained exhibits excellent dispersion stability of titanium oxide nanoparticles within a water-based dispersion medium even when left in a cold and dark indoor area for a long period of time, expresses photocatalytic activity even in visible light (400 to 800 nm) alone, and can easily create a photocatalytic thin film which is extremely transparent and exhibits excellent durability, and in which the state of copper coordination when exposed to heat or ultraviolet rays is stable and cannot be easily modified.

A CO.sub.2 recovery apparatus according to the present invention comprises: an absorption tower comprising a CO.sub.2 absorption unit in which an exhaust gas containing CO.sub.2 and a lean solution comprising an amino group-containing compound are brought into contact with each other to allow the lean solution to absorb CO.sub.2; a regeneration tower in which CO.sub.2 contained in a rich solution is separated to regenerate the rich solution; and a purification unit in which an amino group-containing compound in a CO.sub.2-removed exhaust gas obtained by removing CO.sub.2 in the CO.sub.2 absorption unit is removed from, wherein the purification unit comprises a catalytic unit in which a photocatalyst is supported on a carrier including a gap through which air can pass, an activation member which activates the photocatalyst, and a power supply unit. The activation member is a pair of electrodes comprising a first electrode and a second electrode.

Disclosed herein are methods of producing photocatalysts for degrading NOx. According to some embodiments of the present disclosure, the method comprises mixing a transitional metal or its oxide with a bone powder or a shell powder, followed by heating the mixture for at least 12 hours to dehydrate the mixture, and calcinating the dehydrated product for 1-5 hours. In certain embodiments, the bone powder is mixed with titanium dioxide at the weight ratio of 1:1. In certain embodiments, the shell powder is mixed with titanium dioxide at the weight ratio of 0.5:1 to 2:1 (w/w).

Provided are a freshness retaining agent that can be obtained by a simple method and exhibits excellent adsorption performance and antibacterial activity, a gas purification device including the freshness retaining agent, and a gas purification system. The freshness retaining agent is formed by adhering tea catechins to a surface and/or an inside of charcoal powders and adhering the charcoal powders to each other with clay interposed between the charcoal powders, thereby exhibiting excellent adsorption performance and antibacterial activity.

A novel photocatalytic oxidation system that combines long lifetime, high-power light emitting diodes (LEDs) with efficient, visible light-activated photocatalysts for the destruction of Volatile Organic Compounds (VOCs) and other pathogens in air and water flow systems under ambient conditions of temperature and pressure is described. The technology uses the combination of visible photocatalysts with robust visible LEDs, uniform side emission fiber optics, and efficient catalyst surface illumination technologies to create a photocatalytic oxidation unit for air and water purification. This combined approach leads to numerous performance benefits including high VOC conversion efficiency, compact reactor volume, low pressure drop, and the elimination of conventional ultraviolet (UV) mercury lamp logistics and hazards.