Initial Copper Concentration Research Articles

Electrochemical removal of copper from a simulated wastewater using a rotating tubular packed bed of woven screens electrode Removal of heavy metals using packed bed rotating electrode

Copper removal from a simulated wastewater was investigated by using rotating tubular packed bed of woven screens electrode as a cathode in a new design of electrochemical reactor. Effects of electrolysis operating parameters like current (0.5–2.5 A), rotation speed (150–750 rpm), and initial copper concentration (100–500ppm) were investigated. Optimization of process parameters was carried out by adopting response surface methodology (RSM) combined with Box–Behnken Design (BBD) where copper removal efficiency was selected as a response function. The results indicated that current has the main effect on the copper removal efficiency followed by rotation speed and concentration. The results of regression analysis revealed that the experimental data could be fitted to a second-order polynomial model with a value of determination coefficient (R2) equal to 0.9894 and Fisher test at value of 51.57 for. The optimum conditions of the process parameters based on RSM method were an initial copper concentration of 205 ppm, current of 2.5A, and rotation speed of 750 rpm utilizing cathode composed of screens with mesh no. 30 where a final copper concentration less than 2 ppm was obtained after 30 min.

Fixed-bed column study for deep removal of copper (II) from simulated cobalt electrolyte using polystyrene-supported 2-aminomethylpyridine chelating resin

This study presents the deep removal of copper (II) from the simulated cobalt electrolyte using fabricated polystyrene-supported 2-aminomethylpyridine chelating resin (PS-AMP) in a fixed-bed. The effects of bed height (7.0–14.0 cm), feed flow rate (4.5–9.0 mL/min), initial copper (II) concentration of the feed (250–1000 mg/L), feed temperature (25–40 °C) and the value of pH (2.0–4.0) on the adsorption process of the PS-AMP resin were investigated. The experimental data showed that the PS-AMP resin can deeply eliminate copper (II) from the simulated cobalt electrolyte. The bed height, feed flow rate, initial copper (II) concentration of the feed, feed temperature and feed pH value which corresponded to the highest removal of copper (II) were 7.0 cm with 35 mm of the column diameter, 4.5 mL/min, 40 °C, 1000 mg/L and 4.0, respectively. The breakthrough capacity, the saturated capacity of the column and the mass ratio of Cu/Co (g/g) in the saturated resin were correspondingly 16.51 mg/g dry resin, 61.72 mg/g dry resin and 37.67 under the optimal experimental conditions. The copper (II) breakthrough curves were fitted by the empirical models of Thomas, Yoon-Nelson and Adam-Bohart, respectively. The Thomas model was found to be the most suitable one for predicting how the concentration of copper (II) in the effluent changes with the adsorption time.

Removal of copper ions from aqueous solution using low temperature biochar derived from the pyrolysis of municipal solid waste

Sustainable methods to produce filter materials are needed to remove a variety of pollutants found in water including organic compounds, heavy metals, and other harmful inorganic and biological contaminants. This study focuses on the removal of Cu(II) from copper aqueous solutions using non-activated char derived from the pyrolysis of mixed municipal discarded materials (MMDM) using a new heat pipe-based pyrolysis reactor. Adsorption experiments were conducted by adding the char to copper solutions of varying concentration (50–250 mg/L) at a constant temperature of 30 °C. The effect of pH on copper adsorption onto the char was also investigated in the range of pH 3 to 6. Copper removal using the char was found to be heavily dependent on pH, adsorption was observed to decrease below a pH of 4.5. However, the initial copper concentration had a little effect on the sorption of copper at high concentration solutions (above 100 mg/L). Overall, the biochar showed an effective copper adsorption capacity (4–5 mg/g) when using copper solutions with a concentration below100 mg/L and pH >4.5. Copper removal using the char tended to follow the pseudo second order kinetic model. Langmuir isothermal model was shown to be the closest fitting isotherm using the linearized Langmuir equation. However, the variety of feedstock used to produce the char led to a variation in results compared to other studies of more specific feedstocks.

Oxidation of Thiosulfate with Oxygen Using Copper (II) as a Catalyst

Thiosulfate effluents are generated in the photography and radiography industrial sectors, and in a plant in which thiosulfates are used to recover the gold and silver contained in ores. Similar effluents also containing thiosulfate are those generated from the petrochemical, pharmaceutical and pigment sectors. In the future, the amounts of these effluents may increase, particularly if the cyanides used in the extraction of gold and silver from ores are substituted by thiosulfates, or if the same happens to electronic scrap or in metallic coating processes. This paper reports a study of the oxidation of thiosulfate, with oxygen using copper (II) as a catalyst, at a pH between 4 and 5. The basic idea is to avoid the formation of tetrathionate and polythionate, transforming the thiosulfate into sulfate. The nature of the reaction and a kinetic study of thiosulfate transformation, by reaction with oxygen and Cu2+ at a ppm level, are determined and reported. The best conditions were obtained at 60 °C, pH 5, with an initial concentration of copper of 53 ppm and an oxygen pressure of 1 atm. Under these conditions, the thiosulfate concentration was reduced from 1 g·L−1 to less than 20 ppm in less than three hours.

Preparation and characterization of poly aniline modified chitosan embedded with ZnO-Fe3O4 for Cu(II) removal from aqueous solution.

Poly aniline modified chitosan embedded with ZnO/Fe3O4 nanocomposites were synthesized using a precipitation method and applied to the removal of Cu(II) from aqueous solution. The synthesized nanocomposite was characterized by FT-IR, XRD, FESEM, TEM, EDS, TGA, BET and zeta-potential analyses. The adsorption batch experiments were conducted as a function of five effective parameters including pH, contact time, initial concentration of copper, temperature, and adsorbent dosage using a central composite design (CCD) in response surface methodology (RSM). Contour and surface plots were used to determine the interaction effects of main factors and optimum conditions of process. The regression equation coefficients were calculated and the data confirmed the validity of second-order polynomial equation for the removal of Cu(II) with novel absorbent. Analysis of variance (ANOVA) showed a high coefficient of determination value (R2) for copper removal being 0.99. The optimum level of the pH, temperature, initial concentration of copper, adsorbent dosage and contact time for maximum Cu(II) removal (94.51%) were found to be 6.5, 31 °C, 82 mg L-1, 0.81 g L-1, and 51 min, respectively. It was confirmed from XPS and EDS analyses that heavy metal ions were present on the surface of nanocomposite after adsorption. The adsorption equilibrium data fitted well with the Langmuir isotherm model and the adsorption process followed the pseudo-second-order and intra-particle diffusion kinetic model. The saturated adsorption capacity is found to be 328.4 mg/g. Thermodynamics analysis suggests that the adsorption process is endothermic, with increasing entropy and spontaneous in nature. Further recycling experiments show that nanocomposite still retains 95% of the original adsorption following the 5th adsorption-desorption cycle. The effects of coexist cation ions on the adsorption of Cu(II) was also investigated under optimal condition. All the results demonstrate that nanocomposite is a potential recyclable adsorbent for hazardous metal ions in wastewater.

Removal of Copper from Aqueous Solution Using Electrocoagulation: Importance of Stirring Effect

Electrocoagulation with aluminum and stainless steel electrodes was investigated. Electrocoagulation tests were performed to treat synthetic wastewater containing heavy metallic ions (Cu2+), with concentrations ranging from 100 to 600 ppm. Concentrations of the remaining copper and coagulant (Al3+), generated by electrochemical oxidation of the anode, were optimized by an experimental design methodology. The study was conducted using a Doehlert matrix. The factors considered are: the initial concentration of copper (CCu0); the stirring speed (N); the current density (J); and the electrolysis time (t). As for the response functions measured by atomic absorption, they imply the final concentration of the metallic ions of copper (Y1) and of the metallic ions of aluminum accumulated in the wastewater after electrocoagulation treatment (Y2). The isoresponse curves and the optimum path study of the two retained responses showed that the two optima were found to be opposite. In order to minimize the two responses and determine the conditions of electrocoagulation that satisfy the requirements of the Tunisian standard for effluent discharges NT-106-02 (≤1 ppm for copper and ≤ 10 ppm for aluminum), multicriteria optimization using the desirability function was achieved. In so doing, the determined optimal operating conditions for the process of electrocoagulation were: CCu0 = 421.43 ppm, N = 44.19 rpm, J = 656.41 mA dm−2 and t = 65.12 min, while the corresponding estimated response values were 0.25 ppm and 3.38 ppm for cooper and coagulant (Al3+), respectively. The removal efficiency over 98% was reached for copper. In addition, the results of the study demonstrate that a simultaneous increase of the current density and the stirring speed notably reduces not only the concentration of the remaining copper but also the treatment duration, without inducing a strong increase of the sludge.

Adsorption of copper ion from solution by polyethylenimine modified wheat straw

Wheat straw (WS) was modified by polyethylenimine (PEI) to enhance its adsorption capacity toward copper ions from solution through epichlorohydrin (ECH) as grafting agent and PEI-WS was the product. Adsorption property of PEI-WS toward Cu2+ was performed from solution in batch mode and fixed-bed column mode. The results showed that adsorption quantity became larger with the rise of solution pH, initial copper concentration while the co-existing ion had little effect. Adsorption quantity was to 48.6 mg/g from experiments at 293 K. Equilibrium experimental data were better fitted by Langmuir model while kinetic processes were better fitted by Elovich model. In column mode, effects of flow rate, bed depth and initial Cu2+ concentration on breakthrough curves were studied and Yan model was suitable to fit the results. Cu-loaded adsorbent was efficiently regenerated by 0.1 mol/L HCl solution. It is implied that PEI-WS be used to remove metal ions from aqueous solution.

Tin(II) 2-ethylhexanoate and ascorbic acid as reducing agents in solution ARGET ATRP: A kinetic study approach by mathematical modeling and simulation

The mechanism of activators regenerated by electron transfer (ARGET) associated with atom transfer radical polymerization (ATRP) has attracted attention because of the transition metal catalyst reduction in the conventional ATRP process. In this paper, a comprehensive mathematical model for solution ARGET ATRP technique is presented, following a distinct approach, in which reaction kinetics for the reducing agent is detailed. Tin(II) 2-ethylhexanoate and ascorbic acid were studied as reducing agents with copper(II) halide complex as a catalyst, and the ARGET mechanism for both of them was proposed and validated with experimental data available in the literature. The kinetic rate constants for such reducing agents (kr) were obtained by an optimization algorithm, and the molecular weights and dispersity were predicted using the method of moments. The higher the initial concentrations of copper (II) halide complex and reducing agent, the higher the number-average molecular weight and the lower the dispersity. Simulation results also confirm that the initial concentration of copper(II) halide complex is a critical parameter with higher sensitivity than the reducing agent in solution ARGET ATRP process.

Copper adsorptive removal from aqueous solution by orange peel residue carbon nanoparticles synthesized by combustion method using response surface methodology

In the present study, new and low-cost orange peel residue carbon nanoparticles as an adsorbent for the removal of copper ions was prepared. The orange peel residue carbon nanoparticles were synthesized by combustion technique by urea as fuel, and characteristics were analysed with BET, FESEM, and FTIR tests. FESEM and BET analysis display smaller particle size (100% below 30 nm), regular and narrow particle size distribution and higher specific surface area for combustion synthesized sample. The central composite design (CCD) under response surface methodology (RSM) by Design Expert software was employed to evaluate the effect of solution pH, initial copper concentration, contact time, and the ratio of fuel to adsorbent (F/A) on the removal efficiency of copper ions. Results of analysis of variance (ANOVA) showed that the initial copper concentration and pH were the most significant parameters for Cu2+ removal. The optimization of Cu2+ removal was carried out by four parameters (pH, the initial concentration of the Cu2+ solution, contact time and F/A) that were chosen in five surfaces. The numerical optimization showed that the optimum removal (94%) obtained at pH = 5, initial Cu2+ concentration = 36 ppm, contact time = 75 min, and F/A = 0.96. The experimental isotherm data were analysed using Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D–R) isotherms. The Temkin equation was found to be in good accordance with equilibrium data for Cu2+ adsorption onto OPCM. The results indicated that the orange peel nanoparticle is efficient and economical for Cu2+ ions removal from aqueous solution.

Copper uptake potential of Philippine giant bamboo (Dendrocalamus asper) under varied initial copper concentration, water hardness and pH

Copper is a commonly used metal in construction, engineering, agriculture and water treatment. Consequently, increased copper concentrations resulting in adverse environmental effects is inevitable. Phytoremediation using Dendrocalamus asper or Philippine giant bamboo (PGB) is a viable option for treatment of copper-contaminated media, but their copper uptake potential remains largely unexplored. As such, the copper uptake of PGB was evaluated under varying environmental conditions, namely initial copper concentration, water hardness and pH.Six-month old propagules were planted in artificially contaminated water in order to determine the copper uptake after 16 days of treatment. Using a Box-Behnken design of experiment, it was found that both initial copper concentration and pH have significant and proportional effects on copper uptake. However, due to possible speciation and/or competition, the optimum copper uptake occurred at 20 ppm Cu and pH 5 (as opposed to 7). A mathematical equation, bearing an R2 = 0.7097, was constructed as a possible model for copper uptake of PGB to understand when PGB phytoremediation is most effective. At copper concentrations lower than 3.81 ppm, higher pH is beneficial to copper uptake and vice versa. Overall, phytoremediation using D. asper or PGB is effective especially at low pH and elevated copper concentrations.

Electrical properties modulation in spray pyrolysed Cu2SnS3 thin films through variation of copper precursor concentration for photovoltaic application

Thin film of Cu2SnS3 (CTS), a truly inexpensive photovoltaic absorber is deposited by low cost and non-vacuum spray pyrolysis technique on glass substrates. As deposited CTS films are of p-type in nature, however they are characterised with undesirably high free carrier concentration which leads to a large amount of recombination. Such a high carrier concentration is successfully reduced from 1020 cm−3 to the order of 1018 cm−3 by varying the initial molar copper concentration in the precursor solution. A combined XRD and Raman spectroscopy analysis reveals that the coexistence of secondary Cu3SnS4 phase is responsible for the higher carrier concentration of the order of 1021 cm−3, due to its semi-metallic nature. The optical study of the film also shows the reduction in the band gap from 1.73 eV to 1.29 eV with the absorption coefficient of >104 cm-1. These features of the precursor optimised CTS film enable it as a promising photovoltaic absorber.

Characterization and mechanism of copper biosorption by a highly copper-resistant fungal strain isolated from copper-polluted acidic orchard soil.

In this paper, a highly copper-resistant fungal strain NT-1 was characterized by morphological, physiological, biochemical, and molecular biological techniques. Physiological response to Cu(II) stress, effects of environmental factors on Cu(II) biosorption, as well as mechanisms of Cu(II) biosorption by strain NT-1 were also investigated in this study. The results showed that NT-1 belonged to the genus Gibberella, which exhibited high tolerance to both acidic conditions and Cu(II) contamination in the environment. High concentrations of copper stress inhibited the growth of NT-1 to various degrees, leading to the decreases in mycelial biomass and colony diameter, as well as changes in morphology. Under optimal conditions (initial copper concentration: 200mgL-1, temperature 28°C, pH 5.0, and inoculum dose 10%), the maximum copper removal percentage from solution through culture of strain NT-1 within 5days reached up to 45.5%. The biosorption of Cu(II) by NT-1 conformed to quasi-second-order kinetics and Langmuir isothermal adsorption model and was confirmed to be a monolayer adsorption process dominated by surface adsorption. The binding of NT-1 to Cu(II) was mainly achieved by forming polydentate complexes with carboxylate and amide group through covalent interactions and forming Cu-nitrogen-containing heterocyclic complexes via Cu(II)-π interaction. The results of this study provide a new fungal resource and key parameters influencing growth and copper removal capacity of the strain for developing an effective bioremediation strategy for copper-contaminated acidic orchard soils.

Optimization of Cu (II) biosorption onto sea urchin test using response surface methodology and artificial neural networks

Copper biosorption potential of the biomass prepared from shells of sea urchin from aqueous solutions at optimum process conditions was studied. Response surface methodology and artificial neural network combined with central composite design were used for modeling and optimization of biosorption and to study interaction effects of process variables. A two-level three-factor face-centered central composite design was used for the experimental design. The influence of pH, initial copper concentration and biosorbent dosage on biosorption of copper was investigated. Prediction capacities of both models were compared and found that response surface methodology showed better prediction performance than artificial neural networks. Kinetic data were well fitted to second-order rate equation showing maximum biosorption capacity of 15.625 mg/g for 100 mg/l metal solution concentration. It was further confirmed by fitting the data to Elovich model. Biosorption mechanism was investigated using intra-particle diffusion and Boyd models. The optimum copper removal efficiency of the biosorbent was found as 89.09%.

Preparation of novel multi-walled carbon nanotubes nanocomposite adsorbent via RAFT technique for the adsorption of toxic copper ions

In the present work, polymer-coated multiwalled carbon nanotube (MWCNT) was prepared via RAFT method. First, a novel trithiocarbonate-based RAFT agent was prepared attached chemically into the surface of MWCNT. In addition, the RAFT co-polymerization of acrylic acid and acrylamide monomers was conducted through the prepared RAFT agent. In the next age, the surface morphology and chemical properties of the prepared components were fully examined by using FTIR, 1HNMR, SEM, TEM, XRD and TGA/DTG techniques. Finally, the modified MWCNT composite was employed as an excellent adsorbent for the adsorption of copper (II) ions. The results indicated that ion adsorption basically relies on adsorbing time, solution pH, initial copper concentration, and adsorbent dosage. Further, the adsorption kinetics and isotherm analysis demonstrated that the adsorption mode was fitted with the pseudo-second-order and Langmuir isotherm models, respectively. Based on the results of thermodynamic study, the ion adsorption process was endothermic and spontaneous. Finally, based on the experimental results, the surface functionalized MWCNT with hydrophilic groups could be successfully used as a promising selective adsorbent material in wastewater treatment.

Remediation of copper ions from aqueous solution using hybrid magadiite: kinetics, isotherm and mechanism of removal

This paper deals with the potential use of hybrid magadiite composite as an alternative adsorbent for the removal of copper ions. Na-magadiite was synthesized by the hydrothermal method. The hybrid magadiite was prepared by using pyrazolone as an organic ligand via dry impregnation technique from Na-magadiite. The hybrid magadiite composite is used in the removal of copper ions in sulphate media. The presence of an organic molecule in hybride magadiite is verified by thermogravimetric analysis and infrared spectroscopy. The X-ray diffraction pattern illustrates the intercalation of the organic ligand into Na-magadiite interlayers and the preservation of the structure after intercalation. The scanning electron micrograph images of modified Na-magadiite show the expansion of the basal spacing resulted in a breakup of the spherical nodules and the concomitant parallel arrangement of the platelets. In batch experiments, the influence of reaction time, kinetics, pH and the initial concentration of copper(II) were investigated. In the case of modified Na-magadiite, the kinetic model of extraction adapted is pseudo-second order. The metallic cation was extracted at a very low pH 1.9, and the capacity obtained is 330 mmol/kg, the complex formed is of the CuL2 type.

Separation of copper ion (Cu2+) from aqueous solution using tri‑n‑butyl phosphate and di‑2‑ethylhexyl phosphoric acid as extractants

In this study, separation of copper ion (Cu2+) from aqueous solution using two phosphorous based extractants (tri‑n‑butyl phosphate and di‑2‑ethylhexyl phosphoric acid) was aimed. The parameters monitored under the equilibrium study were initial copper concentration, extractant concentration, and pH. The copper concentration was taken in the range of 20 to 100ppm, the extractant composition in the organic phase was varied from 10 to 40vol% dissolving in toluene as an inactive diluent, and the pH effect was studied in the range of 1 to 11. The distribution coefficients were calculated, and a model equation was developed to estimate model parameters like the number of reacting molecules of the extractant and equilibrium constant using experimental results. In the kinetic study, the initial aqueous phase copper concentration, and the extractant concentration were changed, and initial rates of extraction were found out to develop a kinetic model and their parameters like rate constant and order of reaction.

Fabrication of polypyrrole composite on perlite zeolite surface and its application for removal of copper from wood and paper factories wastewater

The large volumes of water used in wood and paper industries produce substantial amounts of wastewater. These industries are among the most polluting ones in the world; there are large quantities of heavy metals (copper, iron, zinc, etc.) and dyes in the wastewater of these industries, and this wastewater has high levels of COD and BOD. We studied copper removal from the effluents of a wood and paper factory by using a polypyrrole composite consisting of natural Zeolite coated on Perlite (PPy/Perlite). The experiments were performed in a batch system in which effects of various parameters including pH, contact time, adsorbent dosage, and temperature on adsorption were studied. Moreover, SEM and FTIR were employed to identify the structure of the synthesized adsorbent. Results indicated that the maximum copper removal (95%) happened at pH=6, contact time of 12 minutes, and adsorbent dose of 0.4 g/100 mL of the wastewater. Furthermore, copper adsorption capacity of the PPy/Perlite adsorbent improved with increases in temperature and reached its peak at 40 °C. Values of the thermodynamic variables (ΔS, ΔH, ΔG) indicated that copper adsorption could occur in the temperature range of 293-323 Kelvin, and was spontaneous and endothermic. Equilibrium information in the studied range of the initial concentrations of copper and in the temperature range suitably matched the Freundlich isotherm. Evaluation of experimental information for studying the kinetics of copper adsorption by PPy/Perlite revealed that copper adsorption followed the pseudo-second-order kinetic model.

Comparative studies on copper adsorption by graphene oxide and functionalized graphene oxide nanoparticles

Abstract In this study, the graphene oxide (GO) was made from graphite powder via a modified Hummers method, then carboxylated to GO COOH in a mixture of a strong basic pH from mixing in the chloroacetic acid with NaOH. The GO and GO COOH were characterized by means of the HR-TEM, FTIR, XRD and zeta potential. On this basis, the Cu(II) was adsorbed onto the GO and GO COOH in aqueous solutions using the simple batch-adsorption mode. The amount of thus-removed Cu(II) was successfully varied, depending on the pH values, initial copper concentration, reaction time and reaction temperature. Under the ambient temperature at pH 6 over 60-min adsorption time, the highest removal efficiency of Cu2+ are 97 and 99.4%, respectively. The experimental data agree well with the Langmuir isotherm in both cases, and the maximum adsorption capacities of GO and GO COOH are 277.77 and 357.14 (mg/g), respectively. The metal adsorption of the GO COOH is better than other carbonaceous adsorbents, and is exothermic and spontaneous from the calculations of chemical thermodynamics. The effect of competing cations on adsorption of Cu(II) ions on GO and GO COOH was evaluated by mono and divalent metals. The reusability of GO and GO COOH were estimated and it was found that both adsorbents have good regeneration properties.

Removal of Cu (II) from Aqueous Solution Using Chromolaena Leaf Powder as Adsorbent

ABSTRACT This paper reports the feasibility of chromolaena odorata leaf powder as adsorbent forThis paper reports the feasibility of chromolaena odorata leaf powder as adsorbent forthe adsorption of Cu (II) metal ions from aqueous solutions at various conditions. Variousindustries discharges heavy metals in water bodies, affect the aquatic life, human health and overallecosystem adversely. So, it is needed to remove the heavy metals present in water using low costtechniques. In this direction, bio-sorption is identified. Batch experimental studies were carriedout for the removal of Cu (II) from waste water by adsorption on chromolaena odorata leaf powder.The effect of several process parameters like the agitation time, the adsorbent size, adsorbentdosage, initial copper concentration, and the effect of solution pH on adsorption are studied. BothLangmuir and Freundlich models for Cu (II) adsorption onto chromolaena odorata leaf powder areproved to be best fit based on high regression coefficient R2 value. The adsorption kinetic modelsfollow the second order. The maximum metal uptake observed at pH 6 for copper removal is10.416 mg/g.

Comparative study of sun-dried and oven-dried Malva sylvestris biomass for high-rate Cu(II) removal from wastewater

Abstract This study compared the sun- and oven-dried powdered Malva sylvestris for removing Cu(II) from aqueous solution. The fresh and Cu-loaded adsorbents characteristics were analyzed by Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller testing and scanning electron microscopy. The studied parameters that affect adsorption capacity were pH (2–7), initial copper concentration (50–150 mg/L), contact time (3–60 min), adsorbent dosage (1–20 g/L) and temperature (10–35 °C). The results showed that the maximum removal of Cu(II) was observed at pH 5 for both adsorbents. The amount of Cu(II) adsorbed onto both adsorbents increased as the contact time and the initial concentration of Cu(II) increased. The adsorbents exhibited the highest Cu(II) removal at a temperature of 35 °C. The adsorption data obtained at different temperatures was described well by the Langmuir isotherm (qm = 172.61–202.81 mg/g for oven-dried and 118.49–133.45 mg/g for sun-dried) and the pseudo second-order kinetic model (R2 = 0.999 and 0.993–0.997 for oven- and sun-dried, respectively). An electroplating wastewater sample was effectively treated using oven-dried powdered M. sylvestris. The adsorption efficiency of the oven- and sun-dried M. sylvestris after five reuses was 70.4% and 26.1%, respectively. Generally, the oven-dried adsorbent was shown to be more effective than the sun-dried for removal of Cu(II) from wastewater. The cost assessment indicated that the oven-dried M. sylvestris is a more economical adsorbent than sun-dried one.