Abstract
This work aimed at analyzing the petroleum adsorption capacity and the compressive strength of cellulose cryogels produced with the addition of 4 and 8% (w/w) sodium hydroxide (NaOH). Cryogels were produced from a 1.5% (m/m) suspension of cellulose microfibers, which originated from Pinus elliotti, in distilled water. The addition of NaOH increased the compression strength of cryogel by 30% when compared to cryogel without the reagent. Due to the 50% decrease in volume, the cryogel FLNB-8h (8% NaOH) has its petroleum adsorption capacity decreased in average by 58%, whereas the FLNB-4 (4% NaOH) cryogel had it only by 14%. The cellulose suspension which provided the best results for the properties of the cryogels tested had a 4% concentration of NaOH.
Highlights
Petroleum is one of the most important energy sources for humans
Sodium hydroxide (NaOH) P.A. was purchased from Neon Commercial, and crude oil was supplied by the Alberto Pasqualini Refinery (Canoas-RS)
The structure of the cryogel is directly related to the size and the distribution of the ice crystals which are formed during the freezing of the cellulose suspension
Summary
Accidents involving the spilling of petroleum and its derivatives often occur during the process of using it, resulting in loss of energy as well as in threats to the environment. Cryogels are a class of materials that can be used as adsorbents They are characterized by their highly porous structure, which gives the material low specific mass and high surface area. They can be produced from different materials, such as silica, alumina, rubber and cellulose derivatives [2]. The objective of the present work was to add sodium hydroxide to the cellulose cryogel, and to evaluate the compressive strength and oil adsorption capacity of the final product
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