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Hydrophilic and Compressible Aerogel: A Novel Draw Agent in Forward Osmosis
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acsami.7b10229 Mingchuan Yu 1 , Hanmin Zhang 1 , Fenglin Yang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acsami.7b10229 Mingchuan Yu 1 , Hanmin Zhang 1 , Fenglin Yang 1
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Forward osmosis (FO) technology is an efficient route to obtain purity water for drinking from wastewater or seawater. However, there are some challenges in draw solution to limit its application. We first introduce a novel sodium alginate–graphene oxide (SA-GO) aerogel as draw agent for highly efficient FO process. The GO nanosheets covalently cross-linked to SA matrix to form a three-dimensional and highly porous aerogel to provide excellent water flux and operation stability, together with the property of compressibility served by SA-GO aerogel resulting in easy water production and regeneration process. When deionized water was used as the feed solution, the SA-GO aerogel exhibited a higher water flux (15.25 ± 0.65 L m–2 h–1, abbreviated as LMH) than that of 1 mol L–1 NaCl (1 M), and there was no nonreverse osmosis phenomenon. The water fluxes were stabilized in the range of 5–6.5 LMH during recycle process of absorbing and releasing water as high as 100 times. It also had a great desalination capacity (water flux was 7.49 ± 0.61 LMH) with the seawater (Huanghai coast) as the feed solution. Moreover, the water production and regeneration process of the SA-GO aerogel can be rapidly and cost-effectively accomplished with low-strength mechanical compression (merely 1 kPa). The results present that the SA-GO aerogels as a promising, innovative draw agent can make the FO process simpler, more efficient, and lower energy consumption. It can be a potential material for hydration bags to fast and repeatable product fresh water from saline water or wastewater.
中文翻译：
亲水性和可压缩气凝胶：正向渗透的新型吸引剂
正渗透（FO）技术是从废水或海水中获取纯净水用于饮用的有效途径。但是，抽签解决方案在限制其应用方面存在一些挑战。我们首先介绍一种新型海藻酸钠-氧化石墨烯（SA-GO）气凝胶，作为高效FO工艺的牵引剂。GO纳米片共价交联到SA基质上，形成三维高孔隙度的气凝胶，可提供出色的水通量和操作稳定性，以及SA-GO气凝胶具有的可压缩性，从而易于制水和再生。当使用去离子水作为进料溶液时，SA-GO气凝胶的水通量（15.25±0.65 L m –2 h –1，缩写为LMH）比1 mol L –1高。NaCl（1 M），并且没有非反渗透现象。在吸收和释放高达100倍的水的循环过程中，水通量稳定在5–6.5 LMH的范围内。它也具有很大的淡化能力（水通量为7.49±0.61 LMH），以海水（黄海沿岸）为进料溶液。此外，SA-GO气凝胶的水生产和再生过程可以通过低强度机械压缩（仅为1 kPa）快速而经济地完成。结果表明，SA-GO气凝胶作为一种有前途的创新牵引剂可以使FO工艺更简单，更有效且能耗更低。它可能是保湿袋从盐水或废水中快速，可重复使用的产品淡水的潜在材料。
更新日期：2017-09-20
中文翻译：
亲水性和可压缩气凝胶：正向渗透的新型吸引剂
正渗透（FO）技术是从废水或海水中获取纯净水用于饮用的有效途径。但是，抽签解决方案在限制其应用方面存在一些挑战。我们首先介绍一种新型海藻酸钠-氧化石墨烯（SA-GO）气凝胶，作为高效FO工艺的牵引剂。GO纳米片共价交联到SA基质上，形成三维高孔隙度的气凝胶，可提供出色的水通量和操作稳定性，以及SA-GO气凝胶具有的可压缩性，从而易于制水和再生。当使用去离子水作为进料溶液时，SA-GO气凝胶的水通量（15.25±0.65 L m –2 h –1，缩写为LMH）比1 mol L –1高。NaCl（1 M），并且没有非反渗透现象。在吸收和释放高达100倍的水的循环过程中，水通量稳定在5–6.5 LMH的范围内。它也具有很大的淡化能力（水通量为7.49±0.61 LMH），以海水（黄海沿岸）为进料溶液。此外，SA-GO气凝胶的水生产和再生过程可以通过低强度机械压缩（仅为1 kPa）快速而经济地完成。结果表明，SA-GO气凝胶作为一种有前途的创新牵引剂可以使FO工艺更简单，更有效且能耗更低。它可能是保湿袋从盐水或废水中快速，可重复使用的产品淡水的潜在材料。
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