Department of Chemical Engineering, National Institute of Technology, Rourkela 769008, Odisha, India.
Department of Chemical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India.
J Colloid Interface Sci. 2019 Feb 1;535:50-57. doi: 10.1016/j.jcis.2018.09.088. Epub 2018 Sep 26.
Oil spills on the surfaces of bodies of water are now a great concern as they affect marine creatures and the ecosystem. Therefore, a facile technique for removal of oil from water is of much interest. In this study, superhydrophobic and superoleophilic coating is synthesized on stainless steel mesh via chemical etching using a mixture of FeCl and HCl followed by treatment with hexadecyltrimethoxysilane. Surface morphology analysis shows the presence of flower like microstructures on the surface after treatment. Superhydrophobic and superoleophilic properties have been achieved on stainless steel mesh with water static contact angle of 167° ± 3°, water tilting angle of 6° ± 1°, and oil static contact angle of nearly 0°. The coating shows excellent thermal, chemical and mechanical stability. Kerosene-water and hexane-water mixtures were successfully separated via a simple filtering process using coated steel mesh with a separation efficiency of more than 98%. This approach can be implemented on any shape or size of stainless steel mesh and will have industrial applications.
水面溢油现在是一个很大的关注点,因为它们会影响海洋生物和生态系统。因此,开发一种从水中去除油的简易技术具有很大的意义。在这项研究中,通过使用 FeCl 和 HCl 的混合物对不锈钢网进行化学蚀刻,然后用十六烷基三甲氧基硅烷处理,在不锈钢网上合成了超疏水和超亲油涂层。表面形貌分析表明,处理后表面存在花状微观结构。不锈钢网上实现了超疏水和超亲油性能,水静态接触角为 167°±3°,水倾斜角为 6°±1°,油静态接触角接近 0°。该涂层表现出优异的热稳定性、化学稳定性和机械稳定性。使用涂覆有不锈钢网的简单过滤过程,成功地将煤油-水和己烷-水混合物进行了分离,分离效率超过 98%。这种方法可以应用于任何形状或尺寸的不锈钢网,具有工业应用前景。
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