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. 2022 May 17;12(24):14976-14985.
doi: 10.1039/d2ra01349e.

Pretreatment of coir lignocellulose for preparation of a porous coir-polyurethane composite with high oil adsorption capacity

Phan Huy Hoang  1 , Hoang Tien Dat  1 , Thai Dinh Cuong  1 , Le Quang Dien  1
Affiliations

Pretreatment of coir lignocellulose for preparation of a porous coir-polyurethane composite with high oil adsorption capacity

Phan Huy Hoang et al. RSC Adv. .

Abstract

In this present work, different treatment methods of coir biomass were investigated to improve the oil sorption capacity. The treated coir material was then used to fabricate an efficient porous coir-polyurethane composite sorbent by incorporating coir into a polyurethane matrix. The new composite possessed an open cell structure with high porosity and high oil sorption efficiency. The suitable technical parameters of the coir treatment process were selected as: hot water treatment at 170 °C for 120 minutes. After treatment under this suitable condition, treated coconut fiber exhibited an oil adsorption capacity of 4.1 g g-1, with an increase of 78.3% compared to that of the original coconut fiber. Furthermore, the application of the as-fabricated porous composite sorbent for oil treatment was examined under various conditions. It was observed that the oil uptake capacity of the new composite sorbent was high, up to 15.2 g g-1 when 20% treated coir material with a particle size of 1 mm was added into the polyurethane matrix. Several advantages of the new porous composite sorbent obtained from coir biomass and polyurethane such as low cost, being eco-friendly, ready availability and high buoyancy make it an efficient sorbent material for oil spill treatment.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. Preparation of coir sample from coconut shell.
Fig. 2
Fig. 2. Adsorption test carried out at room temperature: (A) treated-coir biomass placement on the oil surface, (B) porous coir–polyurethane composite sorbent placement on the oil surface and (C) illustration of oil adsorption experiment.
Fig. 3
Fig. 3. Oil adsorption of treated coir material from different treatment methods.
Fig. 4
Fig. 4. SEM images of (A) initial coir biomass and (B) coir biomass after hot water treatment.
Fig. 5
Fig. 5. Effect of coir biomass size on oil adsorption capacity of the composite sorbent (15% w/w of coir biomass).
Fig. 6
Fig. 6. Effect of content of coir biomass on oil adsorption capacity of the composite sorbent (size of coir material of 1 mm).
Fig. 7
Fig. 7. Optical image of pristine PU foam (A), coir–PU composite (B) and SEM image of porous coir–PU composite (C).
See this image and copyright information in PMC

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