Investigation of the pumice mineral adsorbent silanization for oil/water separation

Subject Areas :

Parveneh  Raeisi ¹ (School of chemical, petroleum and gas engineering, Iran university of science and technology)
Reza  Norouzbeigi ² (Ph.D. of Chemical Engineering, Separation Process and Material processing, Faculty of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Tehran, Iran)
Hadi  Shayesteh ³ (Ph.D. candidate in Chemical Engineering, Separation Process and Material processing, Faculty of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Tehran, Iran)

Received: 2021-07-17 Accepted : 2021-11-24 Published : 2022-02-20

Keywords: Pumice, Oil/water separation, Superhydrophobicity, Contact angle,

Abstract :

Providing acceptable and cost-effective environmental biomaterials that can remove the oily phase from the water is necessary. The aim of the present study was to prepare pumice, an oil adsorbent, and performance evaluation of the mineral material in oil/water separation. By applying one factor at a time method, the effect of the modifier type (octadecyl trichlorosilane and trimethylchlorosilane) and the modifier concentration (within a specific range) were evaluated for the pumice. The optimum water contact angle of pumice was obtained 159.2°±0.82°. Instrumental characterizations were performed to determine the properties of the adsorbents. Also, the presence of modifiers on the surface of the pumice was confirmed. The removal efficiency and flow rate of dichloromethane from water using pumice were 98.3% and 8422.38 Lm-2 h-1, respectively. Also, separation efficiency experimental in ten cycles was performed, and the separation efficiency was still above 92% after ten cycles of oil/water separation. On the other hand, with increasing separation cycles, the flux decreased from 8422.38 to 3445.52 Lm-2 h-1. The variation of water contact angle values vs. water immersion time was evaluated to examine the particles' durability. After 6 h, water contact angle decreased from 159.2° to 153.3°.

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