Environmentally safe and cost-effective microplastic isolation using a salt-sugar flotation approach.

Area of Science:

• Environmental Science
• Environmental Chemistry
• Green Chemistry

Background:

• Microplastics are pervasive environmental pollutants with detrimental impacts on ecosystems.
• They act as vectors for hazardous contaminants, affecting soil fauna, plants, and water bodies.
• Conventional microplastic remediation using density separation with salts is expensive and has drawbacks.

Purpose of the Study:

• To develop an environmentally benign, cost-effective flotation medium for microplastic remediation.
• To evaluate the efficacy of common salt and table sugar solutions for microplastic separation.

Main Methods:

• Tested three cost-effective salt solutions: food-grade common salt, table sugar, and a 1:1 salt-sugar solution.
• Assessed the efficiency of these solutions in separating microplastics using density separation.
• Compared the performance of the salt-sugar solution to AR-grade sodium chloride.

Main Results:

• The 1:1 food-grade salt-sugar solution demonstrated efficiency comparable to AR-grade sodium chloride.
• This eco-friendly solution achieved 100% separation efficiency for low-density microplastics.
• It showed 43.3-76.7% separation efficacy for high-density microplastics in spiked samples.

Conclusions:

• A 1:1 common salt and table sugar solution is an effective and safe microplastic remediation medium.
• This method offers a cost-effective alternative to conventional salt-based remediation.
• The developed flotation media is environmentally benign and suitable for safe disposal.