Bolisetty Sreenath, Reinhold Noemi, Zeder Christophe, Orozco Monica N, Mezzenga Raffaele
ETH Zurich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, 8092 Zurich, Switzerland.
Chem Commun (Camb). 2017 May 23;53(42):5714-5717. doi: 10.1039/c7cc00406k.
We show the purification of arsenic-contaminated water using amyloid fibril-based membranes, which adsorb both the arsenate (+5) and arsenite (+3) oxidation forms at efficiencies of ∼99%. Binding isotherms indicate that amyloid fibrils possess multiple binding residues capable of strongly adsorbing arsenic ions via metal-ligand interactions, delaying the saturation of the membrane. We also show that these membranes can be reused for several cycles without any efficiency drop, and validate our technology in purifying real contaminated ground water by removing arsenic with an efficiency as high as 99.6%. These results make this technology promising for inexpensive, efficient and low-energy removal of arsenic from contaminated water.
我们展示了使用基于淀粉样纤维的膜对受砷污染的水进行净化，该膜对砷酸盐（+5价）和亚砷酸盐（+3价）这两种氧化态的吸附效率约为99%。结合等温线表明，淀粉样纤维拥有多个能够通过金属-配体相互作用强烈吸附砷离子的结合位点，从而延缓了膜的饱和。我们还表明，这些膜可以重复使用几个循环而不会出现任何效率下降，并通过去除砷的效率高达99.6%来验证我们的技术在净化实际受污染地下水方面的效果。这些结果使得这项技术有望用于从受污染水中廉价、高效且低能耗地去除砷。
