A new concept of low-cost direct air capture technology integrated with a fertilization system is proposed, as an alternative to the application of air derived CO 2 . A moisture swing sorbent can elevate the CO 2 concentration from 400 parts per million (ppm) to several thousand ppm, and this can be used to cultivate plants. Desorption isotherms were determined and are described well by a Langmuir model. The adsorption rate constant and the desorption rate constant were gained at 25 °C, 35 °C, and 45 °C under 1000 ppm concentration of CO 2 . In accelerated cultivation experiments, the effects of CO 2 concentration, light intensity, and spectrum on the CO 2 uptake rate of the plants were investigated. A multi-bed desorption system which is capable of providing a continuous and stable CO 2 supply for a greenhouse is demonstrated based on the desorption characteristic and CO 2 uptake feature of plants. An energy and cost assessment for the integrated system was performed and the results indicated that minimum energy requirements and cost estimate of CO 2 are 35.67 kJ/mol and 34.68 USD/t, respectively. This makes direct air capture a competitive and sustainable carbon source for agriculture.
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Hou et al. (2017) studied this question.