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Filtration

Filtration

Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...

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Development of Lignin-Containing Cellulose Nanofibrils Coated Paper-Based Filters for Effective Oil-Water Separation.

Anna Mittag¹, Md Musfiqur Rahman², Islam Hafez²

¹Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA.

|January 21, 2023

Summary

Lignin-containing cellulose nanofibril (LCNF) modified filter papers effectively separate oil-water mixtures. Higher LCNF coat weights improve oil collection, with wet filters showing superior performance for efficient oil-water separation.

Keywords:

lignin-containing cellulose nanofibrils oil-water separation surface modification water filtration

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Area of Science:

Materials Science
Environmental Science
Chemical Engineering

Background:

Industrialization generates significant oil-water mixtures, necessitating advanced separation techniques.
Cellulose nanofibrils (CNFs) offer promising properties for oil-water separation due to their barrier capabilities.
Lignin-containing CNFs (LCNFs) are a sustainable, cost-effective alternative to CNFs with enhanced barrier properties.

Purpose of the Study:

To develop and evaluate LCNF-modified filter papers for oil-water emulsion separation.
To investigate the impact of LCNF coat weight on separation efficiency and filtration flux.
To compare the performance of wet versus dry LCNF-modified filters.

Main Methods:

Commercial filter papers were coated with LCNF suspensions using vacuum filtration to create modified filters.
LCNF-modified filters (both wet and dry) were tested for their ability to separate oil-water emulsions.
Filtration time and oil collection capabilities were analyzed in relation to LCNF coat weight.

Main Results:

A positive correlation was observed between LCNF coat weight and oil collection efficiency.
Filtration flux decreased with increasing LCNF coat weight, suggesting an optimal range.
Wet LCNF-modified filters demonstrated higher flux and oil separation efficiency than dry counterparts.

Conclusions:

LCNF-modified filter papers show significant potential for effective oil-water separation.
The LCNF coat weight is a critical factor influencing separation performance.
Wet LCNF-modified filters offer enhanced performance for oil-water separation applications.