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Related Concept Videos

Coagulation01:06

Coagulation

453
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
453

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Study on the cell-collector-bubble interfacial interactions during microalgae harvesting using foam flotation.

Xifan Nie1, Haiyang Zhang2, Shaozhe Cheng1

  • 1Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the Total Environment
|October 15, 2021
PubMed
Summary
This summary is machine-generated.

N-cetyl-N-N-N-trimethylammonium bromide (CTAB) preferentially adsorbs onto bubbles, reversing their charge and enabling electrostatic attraction to microalgae cells for efficient harvesting via foam flotation.

Keywords:
AdsorptionCTABChlorella sorokinianaFoam flotationInterfacial mechanism

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Environmental Science

Background:

  • Foam flotation is a cost-effective method for microalgae harvesting.
  • The precise interfacial interactions between microalgae cells, collectors, and bubbles are not fully understood.
  • Existing hypotheses on microalgae foam flotation mechanisms require experimental validation.

Purpose of the Study:

  • To elucidate the interfacial mechanism of microalgae-collector-bubble interactions during foam flotation.
  • To quantify the adsorption of N-cetyl-N-N-N-trimethylammonium bromide (CTAB) on microalgae cells and bubbles.
  • To determine the role of CTAB in modifying surface charges and facilitating microalgae capture.

Main Methods:

  • Utilized cationic surfactant N-cetyl-N-N-N-trimethylammonium bromide (CTAB) as a collector.
  • Quantified CTAB adsorption on Chlorella sorokiniana cells and air bubbles.
  • Calculated zeta potential of cells and bubbles before and after CTAB adsorption.

Main Results:

  • Over 90% of CTAB adsorbed onto bubbles, reversing their surface charge from negative (-20 mV) to positive (6.1 mV).
  • Microalgae cells showed minimal CTAB adsorption (0-3%), with surface charge slightly shifting from -22.3 mV to -18.6 mV.
  • A mechanism involving hydrophobic insertion of CTAB tails into bubbles and electrostatic attraction between positively charged bubbles and negatively charged cells was proposed.

Conclusions:

  • CTAB primarily modifies bubble surface properties, not microalgae cell surfaces, for effective foam flotation.
  • The study proposes a clear mechanism for microalgae-CTAB-bubble interactions, driven by electrostatic attraction.
  • Understanding this mechanism can guide the development of improved collectors and devices for efficient microalgae harvesting.