可再生重金屬吸附劑：有效去除污染水體中的重金屬

論文標題：Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water

作者：Andrew R. Barron et al

數字識別碼：10.1038/s41598-017-06734-7

《科學報告》發表的文章Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water展示了一種可用於解決水體重金屬污染問題的可再生負載型環氧化碳納米管吸附劑。

乾淨而豐富的水資源是社會繁榮的重要基石，然而，不斷增長的社會發展需求和變化無常的氣候正在耗盡來自河流和地表含水層中的水資源。與此同時，這些水源的質量也時刻受到有害污染物的威脅，其中重金屬污染受到越來越多的關注。最近，有學者提出氧化石墨烯（graphene oxide）可作為吸附劑用於治理水體，但這種方式需要固定相，同時還要保持高的比表面積。

在本篇文章中，來自美國萊斯大學的Andrew R. Barron及其團隊通過使多壁碳納米管在石英基底上生長的方法來製備並表徵了負載型環氧化碳納米管（SENT）。環氧化過程的引入為這種碳納米管提供了足夠的功能特性，使得其能夠對初始濃度為60-6000 ppm範圍內的模擬工業廢水中的多種重金屬離子（Cd2+，Co2+，Cu2+，Hg2+，Ni2+和Pb2+）進行吸附。 該研究結果顯示，SENT對於上述離子的吸附效率> 99.4％，吸附飽和濃度明顯高於石墨烯h酸化的多壁碳納米管。 同時，SENT吸附劑具有在溫和的條件可再生的特點，通過全球可用的家用化學品——醋，即可非常容易地實現SENT的再生。研究者通過計算指出， 1克SENT有可能將83,000 L被污染的水處理至世界衛生組織規定的限值，按照每人每日最低7.5 L的生活用水標準，這足以讓11,000人從中受益。

摘要：Although clean and abundant water is the keystone of thriving communities, increasing demand and volatile climate patterns are depleting rivers and aquifers. Moreover, the quality of such water sources is threatened by noxious contaminants, of which heavy metals represents an area of growing concern. Recently, graphene oxide (GO) has been suggested as an adsorbent; however, a support is desirable to ensure a high surface area and an immobile phase. Herein, we described the preparation and characterization of a supported-epoxidized carbon nanotube (SENT) via the growth of multi walled carbon nanotubes (MWNTs) onto a quartz substrate. Subsequent epoxidation provides sufficient functionality to enable adsorbent of heavy metals (Cd2+, Co2+, Cu2+, Hg2+, Ni2+, and Pb2+) from aqueous solution with initial concentrations (60–6000 ppm) chosen to simulate high industrial wastewater contamination. The SENT adsorption efficiency is >99.4% for all metals and the saturation concentration is significantly greater than observed for either GO or acid treated MWNTs. The SENT adsorbent may be readily regenerated under mild conditions using a globally available household chemical, vinegar. 1 g of SENT has the potential to treat 83,000 L of contaminated water down to WHO limits which would be sufficient for 11,000 people.

期刊介紹：Scientific Reportsis an online, open access journal from the publishers of Nature. We publish scientifically valid primary research from all areas of the natural and clinical sciences.

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