BACKGROUND: Low oxygen content and high density of airborne fine particulates in closed environments are serious problems threatening people's health. Herein a novel concept of using microalgae for air purification is proposed, and approaches, including the construction of a condensed microalgae film and the use of hydrogel, to realize this concept in a real-world application are discussed. RESULTS: The results demonstrated that moisture loss, which limited O 2 production and fine particulates removal, is a serious technical barrier to the durable use of this air purifier. With the addition of hydrogel, moisture loss of microalgae film in 8 h was reduced to 24.76%. Comparison of the contributions of hydrogel and microalgae indicated that in this air purifier, microalgae mainly contributed to fine particulates removal while hydrogel enhanced the performance of microalgae film by alleviating the moisture loss. Studies on the mechanisms proved that fine particulates removal by microalgae film is mainly driven by negative surface charge on microalgae cells. CONCLUSIONS: This study showed that qa microalgae-film based air purifier performed well in oxygen production and fine particulates removal. In a real-world application, to properly operate this air purifier, moisture content and pH value of the microalgae film should be strictly controlled.
Bibliographical noteFunding Information:
This study was supported by the National Natural Science Foundation of China (51668044), the Key Research Development Program of the Jiangxi Province of China (20161BBH80029, 20171BBG70036 and 20181BBH80004), the Talent Program for Distinguished Young Scholars of Jiangxi Province of China (20171BCB23015), and the Key Science and Technology Research Program of Department of Education of the Jiangxi Province of China (150029).
© 2018 Society of Chemical Industry
- air purification
- chlorella sp
- fine particulates