Related Experiment Video
Updated: May 14, 2026
08:01
Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
Spent Coffee Grounds as an Adsorbent Material for Metal Ions
1Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland.
Materials (Basel, Switzerland)
|May 13, 2026
Summary
Spent coffee grounds (SCGs) are a valuable bio-waste for removing metal ions from wastewater. This review explores SCGs
Area of Science:
- Environmental Science and Engineering
- Materials Science
- Green Chemistry
Background:
- Agricultural and food industry residues, like spent coffee grounds (SCGs), are key to the circular bioeconomy.
- SCGs are abundant lignocellulosic biomass, suitable for developing low-cost adsorbents.
- Metal-contaminated wastewater poses environmental risks, necessitating sustainable treatment solutions.
Purpose of the Study:
- To review recent research on applying SCGs for metal ion removal from aqueous systems.
- To comparatively evaluate the adsorption performance of raw and modified SCGs.
- To discuss operational parameters influencing metal adsorption efficiency.
Main Methods:
- Literature review of studies utilizing SCGs for metal ion adsorption.
- Comparative analysis of adsorption performance for raw, carbonized, and chemically functionalized SCGs.
- Discussion of key operational parameters (e.g., pH, temperature, contact time) affecting adsorption.
Main Results:
- SCGs demonstrate significant potential as low-cost adsorbents for various metal ions.
- Modification methods like carbonization and chemical functionalization can enhance SCGs' adsorption capacity.
- Operational parameters critically influence the efficiency of metal ion removal by SCGs.
Conclusions:
- Spent coffee grounds offer a sustainable and cost-effective solution for treating metal-contaminated wastewater.
- Optimized SCG modification and process conditions can maximize metal removal efficiency.
- Further research can advance the use of SCGs in industrial wastewater treatment applications.
More Related Videos
10:44Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for Cu(II) Through Microwave Pre-Pyrolysis
Published on: February 12, 2019
11:14Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Related Concept Videos
00:56Extraction: Advanced Methods
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
01:09Colloidal 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...
00:49Gravimetry: Inorganic And Organic Precipitating Agents
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
01:08Electrodeposition
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
01:17Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
01:06Coagulation
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...