关键词: 表面, 界面, 废水, 滤纸, 双疏, 碱性盐水, 油

Abstract:

With the rapid development of industry and catering service industry, the discharge of oil bearing alkaline salt water is becoming more and more frequent, which poses a serious threat to ecological environment. In order to deal with oil pollution removal under complex water conditions, it is urgent to develop a cheap, degradable and efficient material for oily water treatment. By hydrothermal at low temperature and chemical liquid phase reduction technologies, hydrophobic copper/calcium carbonate (Cu/CaCO₃) layer was deposited on the surface of filter paper, and a modified filter paper with dual superlyophobic (hydrophobic under oil/oleophobic under water) property was obtained. The wettability, surface morphology and structure of the modified filter paper were analyzed by contact angle measuring instrument, scanning electron microscopy (SEM), infrared spectroscopy (FTIR) and X-ray photoelectricity spectroscopy (XPS). The water contact angle under oil and oil contact angle under water was 142° and 145°, respectively. After soaking in alkaline salt water for different time periods, there was no obvious change in the dual superlyophobic property of the modified filter paper. Through the wetting of oil or water, the filter paper could achieve effective separation of high density oil or low density oil in alkaline salt water only under gravity drive, and the separation efficiency was higher than 97.7%. After the separation for 20 times, the separation efficiency of the modified filter paper remained stable. The dual superlyophobic filter paper had the advantages of simple preparation process, low cost and degradability, and had potential application prospect in the separation of oil from alkaline high-salt wastewater.

Key words: surface, interface, waste water, filter paper, dual superlyophobic, alkaline salt water, oil