Wettability Of Recycled 3D Printing Polymer Membrane With Candle Soot Coating For Oil/water Separation

Abstract

The evaluation of a membrane's wettability is crucial in improving the efficiency of oil/water separation; this can be achieved by calculating the liquid's contact angle with the surface. Creating hydrophobic surfaces for the purpose of separating oil from water has attracted a lot of attention recently. Nevertheless, the wettability behavior of three-dimensional (3D) printing membranes for oil and water separation is still under research. The objective of this study to determine the wettability characterization of 3D Printing polymer membrane with candle soot coating for oil/water separation. The research methodology included material characterization between scanning electron microscopy (SEM), surface roughness, porosity, and contact angle measurement on polyamide-12 (PA-12) membranes, coated with candle soot. Highest surface roughness value of 14.724 μm is recorded for coated recycled bottom surface membrane with 80Watt of laser power and 0.12 mm layer thickness. Meanwhile, the lowest value of surface roughness (9.9357 μm) is measured for non-coated virgin top surface membrane with 80Watt of laser power and 0.12 mm layer thickness. The value for membrane contact angle of coated virgin 70Watt top, virgin 70Watt bottom, recycled 70Watt top, recycled 70Watt bottom, virgin 80Watt top, virgin 80Watt bottom, recycled 80Watt top, recycled 80Watt bottom are 143.50, 148.20, 141.70, 147.30, 138.20, 145.40, 146.10, 151.80 respectively; for non-coated virgin 70Watt top, virgin 70Watt bottom, recycled 70Watt top, recycled 70Watt bottom, virgin 80Watt top, virgin 80Watt bottom, recycled 80Watt top, recycled 80Watt bottom, the measured contact angles are 137.80, 142.30, 137.80, 138.90, 136.90, 139.20, 144.10, 145.90, respectively. Based on SEM result, there are porous and melt characterization in every side of membrane depend the parameters that be used. The percentage for porosity result of coated membrane of virgin 70Watt, recycled 70Watt, virgin 80Watt, recycled 80Watt are 21.87%, 21.51%, 14.80%, 19.84%; as for non-coated virgin 70Watt, recycled 70Watt, virgin 80Watt, recycled 80Watt, the measured porosity are 20.18%, 19.95%, 13.78%, 16.51%. Results show that coated membrane performs the best which it can well separate water from oil. Recycled membrane has rough characterization naturally because it contains impurities from cooling and heating treatment before. Coating a membrane makes it rougher because the coating uses paraffin wax which it can hold coalescence of powder well. Moreover, paraffin wax has hydrophobic characterization itself and it can be higher contact angle measurement until superhydrophobic result with recycled membrane. Higher laser power also makes recycled membrane was more melting such as sapphire form which it can increase roughness. For conclusion, all of characterizations make air trap and behavior for creating a solid-water-air interface for super-hydrophobicity which it makes good separation of oil-water. Parameter production, coating, and material characteristic are important to consider to make good polymer membrane for oil/water separation.