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Coagulation

Coagulation

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...

Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Related Experiment Video

Updated: Dec 30, 2025

Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions

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Published on: July 3, 2025

Cross-Linked Double Network Graphene Oxide/Polymer Composites for Efficient Coagulation-Flocculation.

Shuyuan Lin¹, Qilong Li², Yujia Zhong¹

¹State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China.

Global Challenges (Hoboken, NJ)

|January 21, 2020

Summary

Researchers developed a novel graphene oxide/polymer hybrid coagulant/flocculant for wastewater treatment. This material effectively removes diverse pollutants simultaneously via a double-network hydrogel, offering a sustainable solution for water purification.

Keywords:

coagulation composites flocculation graphene oxide

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Area of Science:

Materials Science
Environmental Science
Nanotechnology

Background:

Hybrid coagulant/flocculants based on nanomaterials show promise for solid-liquid separation in water treatment.
Existing methods often struggle with simultaneous removal of diverse and complex pollutants.

Purpose of the Study:

To develop a graphene oxide/polymer-based hybrid coagulant/flocculant for efficient wastewater purification.
To achieve simultaneous precipitation of large-scale, multicomponent pollutants including dyes, heavy metals, and nanoparticles.

Main Methods:

Development of a bioinspired hybrid coagulant/flocculant using graphene oxide and polymer.
Utilizing Ca2+ crosslinking to form a double-network hydrogel at room temperature.
Application in the coagulation-flocculation-sedimentation process for wastewater treatment.

Main Results:

The hybrid material effectively precipitates large-scale, multicomponent pollutants simultaneously.
Successful purification of wastewater achieved through the developed coagulation-flocculation-sedimentation method.
Demonstrated formation of double-network hydrogel via bioinspired Ca2+ crosslinking.

Conclusions:

The developed graphene oxide/polymer hybrid coagulant/flocculant offers a novel and effective approach for wastewater purification.
This method provides a new strategy for preparing macroscopic assemblies of multicomponents with potential in various fields.
The room-temperature, simultaneous pollutant removal highlights the material's efficiency and environmental applicability.