Where can someone get information about building a device that can capture carbon dioxide out of the air?

Google.

A very simple method is to use a carbon filter with a fan. Put the filter behind the fan, and it should suck the air and pass it through the filter, which will then release "clean" oxygen.

The simplest way would be to bubble the air through lime water. The CO2 reacts to form a precipitate of calcium carbonate, leaving CO2 free air as it exits.

You could also blow the air across solid lime, but you would have to recirculate it quite a bit to get the reaction to go to completion.

By lime I mean calcium hydroxide, Ca(OH)2

To liberate the oxygen from calcium carbonate, first react it with HCL to form pure CO2. Then heat the CO2 over a catalyst of iron doped zeolite and hydrogen to produce water and ethylene. A nonthermal plasma applied to ethylene will generate carbon soot and recover the hydrogen. Electrolysis of water gives back the extra hydrogen and produces oxygen.

That's all there is to it. No filters involved!

the authentic problem is that the gov't and media are making CO2 out to be a significant pollutant or toxin (a "undesirable guy"), while it needless to say isn't. A pollutant, legitimately, is a chemical substance it relatively is risky to residing structures, some thing like sulfar dioxide or carbon monoxide or benzene... often guy-made, inspite of the undeniable fact that there are exceptions...alongside with sulfur dioxide from volcanoes and rotting plant life. because it happens, CO2 is a organic subtance, expelled by making use of animals and flora, and absorbed by making use of photosynthetic flora in the time of one 0.5 of their respiration cycle. it is not poisonous, and have been one waiting to push a button and smash all of this chemical compount in minute, we'd be in a "international of injury," as our grant of oxygen could quickly disappear, and all life on the earth could succumb. people who rant approximately AGW (and ACC) are the two untutored in technological expertise or have some hidden schedule. they're rightly labled Alarmits. no longer withstanding the final want for admire of ecological standards (and a change far off from fossil fuels and nuclear capacity, and the will for rapid progression of option ability of propulsion), those human beings understand no longer of what they talk. There are a pair of dozen the clarification why the "international Warming" hypothesis isn't supported by making use of technological expertise. regrettably, just about all and sundry has "inebriated the Kool-help." in straightforward terms a number of the themes with this hypothesis: a million. Warming leads CO2 boost. 2. the biggest "greenhouse gasoline" is water vapor. 3. image voltaic activity is the main effective "driver" of temperature replace. 4. The statistics have been cherry-picked and manipulated in an important thank you to offer the curiously cataclysmic problem...which has no longer materialized. 5. The fashions used are complicated, contain significant assumptions, and are incorrect. 6. while the dire predictions are no longer fulfilled, the alarmists hem and haw and are available up with stupid excuses. Like religious cult-individuals, they INSIST on their factors, in the certainty of contradiction. 7. The Antarctic ice-%. has grown thicker over contemporary years, different than for one small section.

Plant a tree.

Try a green plant in a pot.