Spent coffee grounds turned into a drug-trapping water filter
Kaya N, Yildiz Uzun Z, Seyfeli RC, Ceylan S
Phytoremediation
The coffee grounds you toss after your morning brew could one day help strip trace medications out of water before they reach rivers and the plants and fish living in them.
Researchers took used coffee grounds, the kind left over after brewing, and baked them into a charcoal-like material with a huge amount of internal surface area for trapping chemicals. When they tested it on water spiked with ibuprofen, the treated coffee waste soaked up over 93% of the drug, and it kept working well even after being reused four more times. It's a neat example of turning a common kitchen byproduct into a tool for cleaning up pharmaceutical pollution in water.
Key Findings
Activated hydrochar made from filter coffee waste achieved a surface area of 1591.89 m2/g, enabling up to 93.52% ibuprofen removal from water
Optimal removal occurred at pH 2.35, 28°C, and 91 minutes contact time with 0.1 g adsorbent per 50 mL of 50 mg/L ibuprofen solution
The material remained effective (80.45% removal) after four additional reuse cycles, and the process was spontaneous and endothermic (ΔH° = 16.99 kJ/mol)
chevron_right Technical Summary
Scientists turned leftover coffee grounds into a powerful filter material that pulled over 93% of the pain reliever ibuprofen out of water in lab tests, pointing to a cheap way to clean pharmaceutical traces from wastewater.
Abstract Preview
Original paper
Evaluation of chemically activated hydrochar from filter coffee waste for ibuprofen removal: process optimisation using response surface methodology.
In this study, hydrochars prepared by hydrothermal carbonization from filter coffee waste, which is released in large quantities from the coffee brewing and processing industries and is considered ...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Coffee is a beverage brewed from roasted, ground coffee beans. Darkly colored, bitter, and slightly acidic, coffee has a stimulating effect on humans, primarily due to its caffeine content, but decaffeinated coffee is also commercially available. There are also various coffee substitutes.