Manufacture of a Hydrophobic Silica Nanoparticle Composite Membrane for Oil-Water Emulsion Separation

Abstract

The superhydrophobic composite membrane was successfully manufactured by a sol-gel method by drying the surrounding pressure. Tetraethylorthosilicate (TEOS) was used as a hydrophobic agent, while waterglass was used as a source of silica. The effect of the water to waterglass ratio (noted at 16:1 and 19:1) was evaluated to study the hydrophobic properties of the silica film coated composite membrane surface. By measuring the water contact angle on the film surface, the highest contact angle was found to occur at the ratio of 19:1, which is 143.86°. The stability of the composite membrane was also investigated by immersing the membrane in water until day 6. The results show that the synthesized composite membrane has good stability until day 6. The hydrophobicity of the surface of the silica film membrane was found to be unaffected by immersion time. Furthermore, the hydrophobicity increased after 6 days due to the interaction of alkyl groups with the humidified environment, and the surface was more stable in hydrophobicity (i.e., the contact angle of water is 153.79°). In addition, hydrophobic properties were obtained, confirming that this film has the potential to be applied to the separation of oil-water emulsions.

Synthesis of Silica Coating Derived from Geothermal Solid Waste Modified with 3-Aminopropyl Triethoxysilane (APTES) and Silver Nano Particles (AgNPs)

“…However, the use of 10 mL water volume led to a contact angle of 45.08°. These results are in accordance with previous researchers concerning the effect of the ratio of water to glass with TEOS as a modifying agent 41) . The resulting contact angle increased and also decreased to 143.86±0.43° and 141.70±0.63°, respectively.…”

“…This causes the hydrophobic structure of silica to be weak. When the silica pores containing ethanol are dried, the ethanol evaporates along with Si-NH2, thereby reducing surface hydrophobicity 41) .…”

Fabrication and Characterization of S-Benzyldithiocarbazate Schiff Base Microcrystals by a Reprecipitation Method for Enhanced Antibacterial Activity

“…In recent times, nanotechnology has been integrated in many parts of our everyday lives. The fabrication of organic and inorganic nano-and microcrystals is one area of growing interest from the perspectives of both fundamental science and applications (Poerwadi et al, 2020;Strokova et al, 2020). However, organic microcrystals have received little attention so far because of difficulties with their characterization and the thermal instability of most of the organic compounds.…”

Effects of Fly Ash Loading on the Characteristics of PVC-based Cation Exchange Membranes for Reverse Electrodialysis

“…Polyvinyl chloride (PVC) is a versatile thermoplastic polymer that shows appropriate chemical and biological resistances for water applications (Giwa et al, 2019). Inorganic nanoparticles are frequently incorporated into polymeric membrane matrixes to increase the membranes' performance, including functionality and thermal, chemical, and mechanical stability (Poerwadi et al, 2020). Developments in ion exchange membranes with the introduction of inorganic nanoparticles using aluminum oxide (Hosseini et al, 2012), titanium oxide (Nemati et al, 2015), and iron oxide (Hong and Chen, 2014) have been reported.…”