Alotaibi Khalid M, Shiels Lewis, Lacaze Laure, Peshkur Tanya A, Anderson Peter, Machala Libor, Critchley Kevin, Patwardhan Siddharth V, Gibson Lorraine T
Department of Pure and Applied Chemistry , WestCHEM , University of Strathclyde , 295 Cathedral Street , Glasgow , G1 1XL , UK . Email:
Department of Chemical and Process Engineering , University of Strathclyde , 75 Montrose Street , Glasgow , G1 1XJ , UK.
Chem Sci. 2017 Jan 1;8(1):567-576. doi: 10.1039/c6sc02937j. Epub 2016 Sep 13.
Iron has been used previously in water decontamination, either unsupported or supported on clays, polymers, carbons or ceramics such as silica. However, the reported synthesis procedures are tedious, lengthy (involving various steps), and either utilise or produce toxic chemicals. Herein, the use of a simple, rapid, bio-inspired green synthesis method is reported to prepare, for the first time, a family of iron supported on green nanosilica materials (Fe@GN) to create new technological solutions for water remediation. In particular, Fe@GN were employed for the removal of arsenate ions as a model for potentially toxic elements in aqueous solution. Several characterization techniques were used to study the physical, structural and chemical properties of the new Fe@GN. When evaluated as an adsorption platform for the removal of arsenate ions, Fe@GN exhibited high adsorption capacity (69 mg of As per g of Fe@GN) with superior kinetics (reaching ∼35 mg As per g sorbent per hr) - threefold higher than the highest removal rates reported to date. Moreover, a method was developed to regenerate the Fe@GN allowing for a full recovery and reuse of the adsorbent in subsequent extractions; strongly highlighting the potential technological benefits of these new green materials.
铁此前已用于水净化，既可以是无载体的，也可以负载在粘土、聚合物、碳或二氧化硅等陶瓷材料上。然而，报道的合成方法繁琐、耗时（涉及多个步骤），且要么使用要么会产生有毒化学品。在此，首次报道了一种简单、快速、受生物启发的绿色合成方法，用于制备负载在绿色纳米二氧化硅材料上的铁系材料（Fe@GN），以创造水修复的新技术解决方案。特别地，将Fe@GN用于去除砷酸根离子，作为水溶液中潜在有毒元素的模型。使用了几种表征技术来研究新型Fe@GN的物理、结构和化学性质。当作为去除砷酸根离子的吸附平台进行评估时，Fe@GN表现出高吸附容量（每克Fe@GN吸附69毫克砷）和优异的动力学性能（每克吸附剂每小时吸附约35毫克砷）——比迄今为止报道的最高去除率高三倍。此外，还开发了一种使Fe@GN再生的方法，从而能够在后续萃取中完全回收并重复使用吸附剂；这有力地突出了这些新型绿色材料的潜在技术优势。
