Copper Biosorption by Spent Coffee Ground: Equilibrium, Kinetics, and Mechanism

Abstract

The potential use of spent coffee ground (SCG) for the removal of copper has been investigated as a low‐cost adsorbent for the biosorption of heavy metals. Adsorption batch experiments were conducted to determine isotherms and kinetics. The biosorption equilibrium data were found to fit well the Freundlich model and an experimental maximum biosorption capacity of copper ions 0.214 mmol/g was achieved. The biosorption kinetics of SCG was studied at different adsorbate concentrations (0.1–1.0 mM) and stirring speeds (100–400/min). The results showed an increase in the copper ion uptake with raising the initial metal concentration and the kinetic data followed the pseudo‐second order rate expression. The effect of stirring speed was a significant factor for the external mass transfer resistance at 100/min and coefficients were estimated by the Mathews and Weber model. Biosorption of copper ions onto SCG was observed to be related mainly with the release of calcium and hydrogen ions suggesting that biosorption performance by SCG can be attributed to ion‐exchange mechanism with calcium and hydrogen ions neutralizing the carboxyl and hydroxyl groups of the biomass.

Physicochemical Characterization and Use of Heat Pretreated Commercial Instant Dry Baker's Yeast as a Potential Biosorbent for Cu(II) Removal

“…Based on these changes we could infer that the main ligand atoms that interacted with Cu(II) ions were O, N, and S. Therefore, hydroxyl, amino, carboxyl, carbonyl, and sulfhydryl groups present on the HPIBY biomass surface were responsible for Cu(II) ions biosorption. The importance of hydroxyl, amino, carboxyl, and carbonyl groups was also noticed in copper adsorption from aqueous solutions by diverse biosorbents, such as: chemically pretreated S. cerevisiae, Posidonia oceanica, peat, spent coffee ground, and rubber leaf powder [10,[45][46][47]. In addition, we found that sulfhydryl groups from cysteine rich peptides were involved in Cu(II) ions adsorption.…”

Adsorption of Ni2+ and Cd2+ from Water by Calcium Alginate/Spent Coffee Grounds Composite Beads

“…Therefore, the SCGs were pretreated with 0.1 M NaOH (Fisher Chemical, Fair Lawn, NJ, USA) to remove the soluble materials as described in Dávila-Guzmán, N.E. et al [19]. The SCGs were washed repeatedly with deionized water after the pre-treatment with NaOH until a value of pH close to 6 was achieved.…”

Comparison of activated carbon prepared from olive stones by microwave and conventional heating for iron (II), lead (II), and copper (II) removal from synthetic wastewater

“…Then, it would be very interesting to find out an application to reuse other precursors of activated carbon production especially from agricultural wastes, which are inexpensive, abundantly available, and renewable materials. From the literature, date bead , spent Coffee Ground , rice husks , almond shells , and sawdust were used to prepare activated carbons. Olive stone (OS) waste residue as a raw material for the production of activated carbon can be considered as one of the best candidate among the agricultural wastes because it is cheap and quite abundant, especially in Mediterranean countries; however, its utilization has not been fully explored.…”