The present disclosure relates to a carbon dioxide capture device comprising a first reactor and a second reactor both of which show a (photo)anode containing or connected to oxygen evolution and/or carbon dioxide evolution catalyst(s) and a (photo)cathode containing or connected to an oxygen reduction catalyst, wherein the first reactor comprises an anion exchange membrane placed between the porous (photo)anode and porous (photo)cathode, and the second reactor comprises a proton exchange membrane placed between the porous (photo)anode and porous (photo)cathode. On the porous (photo)cathode side of the first reactor there is a fluid inlet able to carry carbon dioxide, air and water, and on the side of the porous (photo)cathode of the second reactor there is a fluid outlet able to carry carbon dioxide and water.

A combined waste water and gas treatment system for efficiently decarbonizing and removing nitrogen, including a water feeding pump, a carbon capture device, an intermediate water tank, and an anaerobic ammonium oxidation reactor connected in sequence through pipelines, where the carbon capture device includes an anode chamber and a cathode chamber; an anode plate is arranged in the anode chamber; a cathode plate is arranged in the cathode chamber; a gas inlet pipe is further arranged at the cathode chamber; an air compressor is connected with the gas inlet pipe; a gas outlet pipe is arranged at a top of the carbon capture device; a water outlet in the intermediate water tank is fluidly communicated with a bottom end of the anaerobic ammonium oxidation reactor through a second water inlet pipe; the gas outlet pipe is fluidly communicated with the second water inlet pipe.

A carbon dioxide recovery system separates CO.sub.2 from gas containing CO.sub.2 via an electrochemical reaction. The carbon dioxide recovery system includes an electrochemical cell including a working electrode and a counter electrode. The working electrode includes CO.sub.2 adsorbent. The CO.sub.2 adsorbent adsorbs CO.sub.2 via an oxygen reduction reaction by using electrons supplied from the counter electrode to the working electrode when a first voltage is applied between the working electrode and the counter electrode. The oxygen reduction reaction produces active oxygen via reduction of O.sub.2. The CO.sub.2 adsorbent desorbs CO.sub.2 by discharging electrons from the working electrode to the counter electrode when a second voltage different from the first voltage is applied between the working electrode and the counter electrode. The CO.sub.2 adsorbent has a promoting function for promoting the oxygen reduction reaction.

A system and method for processing industrial waste gas based on a combination of photoelectrocatalysis and a biotrickling filter, including an industrial waste gas simulation generator, a photoelectrocatalytic reactor and at least one biotrickling filter. The industrial waste gas simulation device transports the industrial waste gas to the photoelectrocatalytic reactor through the buffer tank and the mixing tank by a fan. Then the industrial waste gas is degraded under the synergistic catalysis of the substances with high catalytic activity generated by the plasma reactor and the photocatalyst activated by the ultraviolet lamp.

An electrochemical reactor 70 is provided with a proton conductive solid electrolyte layer 75; an anode layer 76 arranged on the surface of the solid electrolyte layer and able to hold water molecules; a cathode layer 77 arranged on the surface of the solid electrolyte layer; and a current control device 73 controlling a current flowing through the anode layer and the cathode layer. The current control device reduces the current flowing through the anode layer and the cathode layer, when the water molecules held in the anode layer become smaller in amount.

A device controls levels of carbon dioxide and water in a controlled environment. The device comprises a first electrode chamber, which receives an input fluid comprising first concentrations of carbon dioxide and water and is configured to deliver a first output fluid having concentrations of carbon dioxide and water lower than the first concentrations to a first environment, and a second electrode chamber having an outlet configured to deliver a second output fluid having third concentrations of carbon dioxide and water to a second environment. A reduction catalyst layer in the first electrode chamber reduces carbon dioxide and water in the input fluid to form ionic carrier species, an ion-transporting membrane is positioned between the first and second electrode chambers and comprises carrier species, and an oxidation catalyst layer in the second electrode chamber oxidizes the ionic carrier species to form carbon dioxide and water.

An air purification system that includes a housing including a pedestal and an outer shell, wherein the outer shell is operable between an extended configuration and a compacted configuration, and includes a filter arranged within the housing along a flow path between an inlet and an outlet of the housing.

In various aspects, systems and methods are provided for integrating molten carbonate fuel cells with a fired heater for production of electrical power while also reducing or minimizing the amount of CO.sub.2 present in the flue gas generated by the fired heater. The molten carbonate fuel cells can be integrated for use with fired heater so that at least a portion of the flue gas from fired heater flows through cathodes of the fuel cells and at least a portion of the cathode exhaust is returned to a convection section of the fired heater.

An electrochemical reactor 70 is provided with a proton conductive solid electrolyte layer 75; an anode layer 76 arranged on the surface of the solid electrolyte layer and able to hold water molecules; a cathode layer 77 arranged on the surface of the solid electrolyte layer; and a current control device 73 controlling a current flowing through the anode layer and the cathode layer. The current control device reduces the current flowing through the anode layer and the cathode layer, when the water molecules held in the anode layer become smaller in amount.

A system and method for processing industrial waste gas based on a combination of photoelectrocatalysis and a biotrickling filter, including an industrial waste gas simulation generator, a photoelectrocatalytic reactor and at least one biotrickling filter. The industrial waste gas simulation device transports the industrial waste gas to the photoelectrocatalytic reactor through the buffer tank and the mixing tank by a fan. Then the industrial waste gas is degraded under the synergistic catalysis of the substances with high catalytic activity generated by the plasma reactor and the photocatalyst activated by the ultraviolet lamp.