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Related Experiment Video

Updated: May 1, 2026

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites

Published on: November 28, 2014

Ball-Milled Spent Coffee Ground Biochar Effectively Removes Caffeine from Water.

Yicheng Yang¹, Yongshan Wan², Jianjun Chen³

¹Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA.

Water

|June 23, 2025

Summary

Spent coffee ground biochar, enhanced by ball milling, effectively removes caffeine from water. This sustainable material shows high adsorption capacity and efficiency in continuous flow systems.

Keywords:

adsorption ball milling biochar caffeine completely mixed flow reactor spent coffee ground

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Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions

Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions

Published on: October 2, 2018

Area of Science:

Environmental Science
Materials Science
Water Treatment

Background:

Caffeine is an emerging contaminant in aquatic ecosystems, posing environmental risks.
Spent coffee grounds (SCG) are abundant waste materials with potential for valorization.

Purpose of the Study:

To investigate the efficacy of SCG-derived biochars for caffeine adsorption.
To optimize biochar properties through pyrolysis and ball milling for enhanced caffeine removal.

Main Methods:

Spent coffee grounds were pyrolyzed at various temperatures (300, 450, 600 °C) to produce biochars.
Biochars were ball-milled to increase surface area and functional groups.
Batch and continuous flow experiments were conducted to assess caffeine adsorption.

Main Results:

Ball-milled biochars pyrolyzed at 450 °C (BMCG450) exhibited the highest caffeine adsorption capacity (82.65 mg/g).
Ball milling significantly increased biochar surface area and oxygen-containing functional groups.
Caffeine adsorption was influenced by pH and ionic strength, with optimal removal under specific conditions.

Conclusions:

Ball-milled SCG biochar (BMCG450) is a promising, cost-effective sorbent for caffeine removal from water.
The material demonstrates high adsorption efficiency in both batch and continuous flow setups.
This research offers a sustainable approach to managing caffeine pollution in aquatic environments.