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The effect of CuO coatings on the electrokinetic properties of stone wool fibres determined by streaming potential measurements

机译：CuO涂层对石棉纤维电动性能的影响流势测量确定

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Commercial stone wool fibres were modified with copper(II) oxide coatings. This oxide is widely used in processes of surface modification for filter materials to improve its bacterial retention. The microorganisms are already susceptible to low concentrations of copper in contrast to humans for which copper is an inert material in the concentration range. Additionally, the coatings changed the electrokinetic properties of the fibres. As a result, the isoelectric point (IEP) of the untreated fibres was shifted from acidic towards a more basic pH range. A positive or no charge on the surface of the fibres allows them to be a substrate for the positively charged adsorbents of negatively charged waterborne contaminants with the use of electrostatic adsorption. The coatings were prepared by dip coating with the use of two different coating precursors: the aqueous suspension of CuO nanoparticles and aqueous solutions of copper(II) nitrate trihydrate or copper(II) acetate or a mixture of thereof. The zeta potential of the modified fibres was determined by a streaming potential method. The adhesion of the coatings was tested by flushing and ultrasonication of the modified fibres. The isoelectric point of the fibres was shifted towards a more basic pH range for all precursors with the largest impact of the copper(II) nitrate trihydrate precursor. This coating changed the IEP of the fibres from 4.1 to 8.3 pH value. The highest calculated coverage of the coatings was in the range of 54% and was obtained by using copper(II) nitrate trihydrate/CuO nanoparticles precursor. Although, we do not predict such modified fibres to act as a standalone water filter, we believe they have the potential to be an excellent support material for active adsorbents. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：用铜（II）氧化物涂层改性商业石棉纤维。该氧化物广泛用于过滤材料的表面改性方法，以改善其细菌保留。微生物易于与铜是浓度范围中惰性材料的人类对比的低浓度铜。另外，涂层改变了纤维的电动性质。结果，未处理纤维的等电点（IEP）从酸性朝向更基本的pH范围转移。纤维表面上的阳性或没有电荷允许它们是具有静电吸附的带负电荷的水性污染物的带正电荷吸附剂的基材。通过使用两种不同的涂层前体浸涂制备涂层：CuO纳米颗粒的水性悬浮液和铜（II）硝酸铜三水合物或乙酸铜（II）的乙酸盐或其混合物。通过流电位法测定改性纤维的ζ电位。通过冲洗和超声处理来测试涂层的粘附性。纤维的等电点朝向更大的pH范围的所有前体移位，所有前体具有铜（II）硝酸锶三水合物前体的最大影响。该涂层从4.1至8.3 pH值改变了纤维的IEP。所计算的涂层的覆盖率在54％的范围内，并通过使用铜（II）硝酸三水合物/ CuO纳米颗粒前体获得。虽然我们没有预测这种改性纤维作为独立的水过滤器，但我们认为它们具有用于活性吸附剂的优异支持材料。 （c）2016 Elsevier Ltd和Techna Group S.R.L.版权所有。

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