عنوان
Water Harvesting from Air Using Nano-composites
نویسنده (گان)
Maghsoodlu,Mohammad ;Anbia,Mansoor;Koohsaryan,Esmat;Bahraminia,Soheil
چکیده مقاله
Recently, the World Economic Forum has addressed the water rarity as the greatest global risk in the near future. Among water sources distributed across the earth, only ca. 1.2% of all fresh waters (2.5%) is surface waters which 3% of its amount is present in the atmosphere. So, it seems to be necessary to investigate the novel strategies for supplying fresh water from different resources. Atmosphere surround us contains amounts of water vapor could be harvested from air. In this way, appropriate adsorbents with good structural quality such as high surface area, porous framework, mechanical and chemical stability and high water uptake performance play incredible role [1]. Amongst various adsorbents, zeolites are well-known solids with intrinsic hydrophilic feature depended on their Si to Al ratios [2]. So, the aim of this study is to investigate the adsorption ability of FAU zeolite framework for water vapor adsorption from air. At first, commercial granular FAU zeolite was purchased (Fig. 1). In order to prepare a composite, certain amount of zeolite was shook with 0.1M calcium chloride solution for 16 hours. The calcium impregnated FAU zeolite was then washed with deionized water several times and dried in an oven overnight. The amount of calcium ions in the zeolite channels is determined using inductively coupled plasma optical emission spectrometry (ICP-OES) and X-ray diffraction pattern (XRD) as well as scanning electron microscopy (SEM) images show the crystalline structure and octahedral morphology of FAU zeolite, respectively. To fulfill the water harvesting tests from air, an adsorption set-up including a sorbent reactor, humidity analyzer and a wet air cylinder has been designed. According to the high water sorption capacity of the composite, it could be a novel idea to gain fresh water from air even at low relative humidity using the proposed adsorbent.

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