Sorption Of Cu Research Articles

Prospective life cycle assessment for sustainable synthesis design of organic/inorganic composites for water treatment

Considering a sustainable approach to the production of novel materials used for water treatment processes, this study presents the development and implementation of prospective life cycle assessment (LCA) as an environmental support tool to identify and quantify the potential environmental impacts during the design, synthesis and testing of innovative organic/inorganic composites for heavy metal ions removal. This research explores two layer-by-layer syntheses routes to develop silica//polyethylenimine (PEI) microparticles with similar characteristics but different efficiencies in the sorption of Cu2+ ions from water and it investigates how scenario-based LCA may be used to forecast potential environmental impacts and sustainability hot spots during the design and synthesis phases. Furthermore, the study explores different approaches to critical LCA elements (e.g. functional units, system limits, design scenarios, and uncertainty analysis).The LCA uses a cradle-to-gate approach for the laboratory scale synthesis and testing processes of inorganic/organic composites, for which chemicals and energy production processes were considered in the life cycle inventory (LCI). Life cycle impact assessment (LCIA) was performed with ReCiPe 2016 at midpoint in 3 steps: at first, initial environmental profiles were generated to evaluate the environmental impacts of the two silica/polymer composites syntheses routes; secondly 3 alternative eco-design scenarios were investigated for replacing some of the chemicals and finally, a scenario-based sensitivity analysis was performed to investigate how inventory data impacts the environmental profiles. The environmental profiles of the two syntheses routes have shown that the B synthesis strategy leads to lower environmental impacts, with the exception of the toxicity related categories, where the initial PEI complexation with Cu2+ ions leads to higher environmental impacts. The eco-design scenarios have demonstrated that by changing the silica support particle with inert quartz microparticles would greatly increase impacts, while changing the initial PEI complexation ion from Cu2+ to another metal would decrease the toxicity related impacts. A sensitivity analysis has recorded significant coefficients of variability for 10 out of 18 impact categories, meaning high uncertainty for these impact values and has identified the silica source as the most important variability contributor.

Mathematical Modeling of the Process of Sorption of Copper Ions (Cu2+) on Chitin and Chitosan Biocomplexes Isolated from the Mycelium of the Fungus Aspergillus Niger

The study of ion sorption of Cu2+ on fungi isolated from mycelium Aspergillus niger chitin- and chitosanglucan complexes showed that these biopolymers have a fairly high sorption ability. As a result of mathematical modeling found that the theoretical models of Langmuir, Freundlich and Temkin are adequate, with a high coefficient of determination (R2 = 0.97–0.99) describe equilibrium sorption of Cu2+ on the studied biocomplexes. An analysis of the sorption parameters obtained from the regression equation shows that the mechanism of sorption of Cu2+ on chitin- and chitosan-containing complexes has a more complex character that differs from the theoretical premises of classical theories and, presumably, is based on the processes of ion exchange and complexation.

Utilization of olive pomace in nano MgO modification for sorption of Ni(II) and Cu(II) metal ions from aqueous solutions

Magnesium oxide nanoparticles were synthesized and modified by olive pomace (NMOOP700) as a novel sorbent and characterized using Fourier Transform Infrared Spectra, Scanning Electron Microscope, Transmission Electron Microscope, X-ray Diffraction, Differential Thermal Analysis and Thermal Gravimetric Analysis. Sorption of Cu (II) or Ni (II) ions were achieved taking into account important parameters including initial pH of the medium, contact time, initial metal ion concentration and temperature. A comparative study between Magnesium oxide nanoparticles and NMOOP700 material for the sorption of Cu (II) or Ni (II) ions was implemented. The obtained data revealed that the sorption process is significantly improved using NMOOP700. The monolayer capacity of Ni (II) and Cu (II) metal ions on NMOOP700 at pH 5 were found to be 149.93 ± 4.4 and 186.219 ± 6.3 mg/g, respectively. Findings of the present work highlight the potential use of NMOOP700 as a novel and effective sorbent material for the removal of Cu (II) or Ni (II) ions from the liquid phase.

Exploration of an Extracellular Polymeric Substance from Earthworm Gut Bacterium (Bacillus licheniformis) for Bioflocculation and Heavy Metal Removal Potential

The present study shows the potential of an extracellular polymeric substance (EPS) produced by Bacillus licheniformis strain KX657843 isolated from earthworm (Metaphire posthuma) gut in the sorption of Cu(II) and Zn(II) and in flocculation. After harvesting bacterial cells from sucrose supplemented denitrifying culture medium, the EPS was extracted following ethanolic extraction method. The Fourier Transform Infrared Spectroscopy (FTIR) and 1H and 13C Nuclear Magnetic Resonance (NMR) of EPS revealed its functional groups, electronegative constituents, unsaturated carbon, and carbonyl groups. The negatively charged functional groups of carbohydrates and protein moiety of the EPS endowed it with heavy metal binding capacity through electrostatic interactions. The highest flocculation activity (83%) of EPS was observed at 4 mg L−1 and pH 11. The metal sorption by EPS increased with increasing pH. At pH 8, the EPS was able to remove 86 and 81% Cu(II) and Zn(II), respectively, from a 25 mg L−1 metal solution. 94.8% of both the metals at 25 mg L−1 metal solutions were removed by EPS at EPS concentration of 100 mg L−1. From Langmuir isotherm model, the maximum sorption capacities of EPS were calculated to be 58.82 mg g−1 for Cu(II) and 52.45 mg g−1 for Zn(II). The bacterial EPS showed encouraging flocculating and metal sorption properties. The potential to remove Cu(II) and Zn(II) implies that the EPS obtained from the earthworm gut bacteria can be used as an effective agent for environmental remediation of heavy metals and in bioflocculation.

Corrigendum to Enhanced sorption of Cu(II) ions from aqueous ions from aqueous solution by ionic liquid impregnated nano-silic and nano-alumina particles (Chem. Ind. Chem. Eng. Q. 23(2) (2017) 207-216)

The authors regret that Figure 6, Table 3, and some statements of the originally published article, must be corrected while the other parts of the article remain unchanged. <br><br><font color="red"><b> Link to the corrected article <u><a href="http://dx.doi.org/10.2298/CICEQ160121034G">10.2298/CICEQ160121034G</a></b></u>

Co-precipitative Preparation of a Sulfonated Cellulose-magnetite Hybrid Sorbent for the Removal of Cu2+ Ions.

A novel sulfonated cellulose-magnetite (Fe3O4) composite sorbent was prepared and applied for the removal of Cu2+ ions from an aqueous solution. It was characterized by infrared spectroscopy, X-ray fluorescence, elemental analysis, SEM, VSM and X-ray photoelectron spectroscopy. The effect of the sorbent dose, initial solution pH, and temperature on Cu2+ removal were studied. The removal of the Cu2+ was completed in 15 min, and the sorption kinetics of Cu2+ was found to follow a pseudo-second-order kinetic model. An equilibrium test demonstrated that sorption of Cu2+ onto a hybrid sorbent agreed well with the Langmuir adsorption model for a maximum adsorption capacity of 4.2 mg/g. Moreover, the optimum pH for Cu2+ removal was found to be ≥4. Furthermore, the thermodynamic parameters reveal the feasibility, spontaneity and endothermic nature of the sorption process. In addition, Cu2+ ions can be desorbed from the sorbent with a 0.5 M H2SO4 solution.

Natural and Chemically Modified Post-Mining Clays—Structural and Surface Properties and Preliminary Tests on Copper Sorption

The structural and surface properties of natural and modified Pliocene clays from lignite mining are investigated in the paper. Chemical modifications are made using hydrofluoric acid (HF), sulfuric acid (H2SO4), hydrochloric acid (HCl), nitric acid (HNO3), sodium hydroxide (NaOH), and hydrogen peroxide (H2O2), at a concentration of 1 mol/dm3. Scanning electron microscopy is used to detect the morphology of the samples. Nitrogen adsorption isotherms were recorded to determine the specific surface area (SSA), mesoporosity, microporosity, and fractal dimensions. The raw clay has an SSA of 66 m2/g. The most promising changes in the structural properties are caused by modifications with HF or H2SO4 (e.g., the SSA increased by about 60%). In addition, the raw and modified clays are used in preliminary tests with Cu(II) sorption, which were performed in batch static method at initial Cu(II) concentrations of 25, 50, 80, 100, 200, 300, and 500 mg/dm3 in 1% aqueous suspensions of the clayey material. The maximum sorption of Cu(II) on the raw material was 15 mg/g. The structural changes after the modifications roughly reflect the capabilities of the adsorbents for Cu(II) adsorption. The modifications with HF and H2SO4 bring a similar improvement in Cu(II) adsorption, which is around 20–25% greater than for the raw material. The structural properties of investigated clays and their adsorptive capabilities indicate they could be used as low-cost adsorbents (e.g., for industrial water pretreatment).

Kinetics and equilibriums adsorption of Cu (II) ion by chitosan and cross-linked chitosan-bentonite

The sorption of Cu (II) particle from aqueous solution onto chitosan and cross-connected chitosan-bentonite (CTS-BTN) as adsorbent were conducted in batch conditions. The impact of different test parameters: starting pH, sorption time was assessed. Equilibrium studies have been completed to decide the limit of chitosan and CTS-BTN for Cu (II) particle. The Langmuir and Freundlich isotherm models were used in the examination of the trial information as linearized conditions. It was discovered that the isotherm information were all around portrayed by the Langmuir isotherm. Chitosan and CTS-BTN showed an adsorption capacity of 125 mg/g and 142.86 mg/g, respectively. The constant of adsorption rate was investigation utilizing a pseudo first order and a pseudo second order model. The pseudo second order model brought about the best fit with test information (R2= 0,991 for CTS and R2= 0,995 for CTS-BTN), additionally giving a constant rate k2, ads= 8.85 x 10-5 g/mg min for CTS and 3.72 x 10-4 g/mg min for CTS-BTN. Recommending that this model could be used in design and applications.Keywords: adsorption; Cu(II) ion; chitosan; cross-linked; isotherm; kinetics

Sorption of d-metal cations by keratin from aqueous solutions

The Cu2+, Cd2+, Ni2+ and Zn2+ metal ions sorption by wool keratin was evaluated from the thermodynamic and kinetic points of view. The experimental data had a very good fit with Langmuir, Freundlich and Dubinin-Radushkevich isotherm models, and the best coefficient of determination was deduced by Langmuir isotherm having value 0.99. The process kinetics was evaluated by intraparticle diffusion model, pseudo-first and pseudo-second order kinetic models, the latter showing the highest correlation with the experimental data. The temperature effect on sorption of Cu2+, Ni2+, Cd2+ and Zn2+ ions from aqueous solutions was determined within a range of adsorption temperatures (283–353 K). The endothermic effect of heavy metal ions sorption by zwitter-ionic form of wool keratin (+H3N-)W(−COO−) indicates that there is a superposition of the sorption process which runs with participation of amino- and carboxyl groups. Acidic keratin groups in the anionic form are involved in the sorption of metal cations, and the amino groups being in the cationic H-form are participated in the sorption of anions to form salt structures [SO42−(+H3N-)2]W[(−COO)2M]. A competitive sorption between doubly- and singly-charged metal cations (M2+/2M+) according to the ion exchange mechanism on the same acid sorption centers of the sorbent was observed. FTIR analysis demonstrated the formation of complexes between Cu2+ and keratin sorption centers that involve terminal free carboxyl groups of amino acids of wool. The chelate structures with metal complexes on acidic sorption sites were computed with the methods of quantum chemistry on modeled compounds, by adhering to chemistry’s best practices.

Facile Synthesis of Calcite-Impregnated Hydrochar with High Sorption Capacity for Cu(II) from Aqueous Solution.

Calcite-impregnated hydrochar (Ca-HC) was successfully synthesized by a one-step hydrothermal method and used as an adsorbent for Cu(II) remediation. Characterization techniques showed that Ca-HC contained calcite and oxygen-containing functional groups. A series of Cu(II) sorption experiments onto Ca-HC showed that the initial Cu(II) concentration, contact time, sorption temperature, and initial pH of the solution influenced the sorption of Cu(II). The actual achievable sorption capacity of Ca-HC for Cu(II) was 130.57 mg g–1 at 303 K, and the sorption process obeyed the Langmuir model and pseudo-second-order kinetic equation. The precipitation and surface complexation rather than ion exchange were mainly ascribed to the removal of Cu(II) onto Ca-HC. The calcite provided the active site to produce posnjakite precipitation during the sorption process and enhance the sorption capacity of the hydrochar. Therefore, these results demonstrated that Ca-HC is an effective sorbent that can remove Cu(II) from water.

Cu(II) Sorption Performance of Novel Chitosan/Ter-(vinyl pivalate-maleic anhydride-N-tert-butylacrylamide) Microcapsules

In this study, first, the ter-polymerization reaction between vinyl pivalate (VP), maleic anhydride (MA), and N-tert-butylacrylamide (NTBA) was done in inert atmosphere (N2). FT-IR and 1HNMR spectroscopy was applied to study the chemical composition of the obtained ter-polymers. MA content of the ter-polymers was determined by following the chemical titration method. Second, novel chitosan/ter-(vinyl-pivalate-maleic-anhydride-N-tert-butylacrylamide) microcapsules were synthesized. In microcapsule production, chitosan polymer served as a matrix for acrylamide ter-polymers with four different molar ratios. The microcapsules were characterized by FT-IR and SEM analyses. Cu(II) sorption efficiency of the microcapsules were tested at different pH levels, temperature, sorbent dosage, and metal ion concentration. Comparison with blank chitosan microbeads revealed that incorporation of acrylamide ter-polymers into the cross-linked chitosan matrix increased the metal sorption. Sorption capacities of the sorbents were recorded; blank chitosan microbeads: 67.03 mg g−1, and chitosan/acrylamide ter-polymer microcapsules: in range of 75.39–98.64 mg g−1. The findings demonstrated chitosan/acrylamide ter-polymer microcapsules can be utilized in sorption of Cu(II) ions in water treatment

Sorption of Cu2+ and Zn2+ Ions by Humic Acids of Tundra Peat Gley Soils (Histic Reductaquic Cryosols)

Sorption properties of humic acid (HA) preparations extracted from the peaty horizon of peat gley tundra soil (Histic Reductaquic Cryosols) are characterized. The kinetic and thermodynamic sorption parameters of Cu2+ and Zn2+ ions by HAs are calculated. The sorption of the study heavy metal ions by HA preparations is estimated to be truly approximated by the pseudo-first-order response equation. The negative values of the Gibbs energy change at temperatures of 298.0 К and 314.3 К for Сu2+ (–26.2 and –24.5 kJ/mol, respectively) and Zn2+ ions (–22.2 and –22.0 kJ/mol, respectively) attest to the possibility of self-sorption of the study ions within the considered temperature range. Changes in the sorption enthalpy values (–33.1 kJ/mol for Cu2+ ions and –4.5 kJ/mol for Zn2+ ions) characterize both reactions as exothermal reactions. As the temperature rises, the sorption equilibrium constant for Сu2+ ions considerably decreases, whereas it does not change significantly for Zn2+ ions. The decreasing sorption equilibrium constants with the rise in temperature point to the equilibrium shift towards desorption. This is a characteristic feature of physical sorption that indicates possible existence of two fixation mechanisms of ions on the surface of HA preparations, namely, physical sorption and сhemisorption.

Heavy metal pollution at mine sites estimated from reflectance spectroscopy following correction for skewed data

The heavy metal concentration of soil samples often exhibits a skewed distribution, especially for soil samples from mining areas with an extremely high concentration of heavy metals. In this study, to model soil contamination in mining areas using reflectance spectroscopy, the skewed distribution was corrected and heavy metal concentration estimated. In total, 46 soil samples from a mining area, along with corresponding field soil spectra, were collected. Laboratory spectra of the soil samples and the field spectra were used to estimate copper (Cu) concentration in the mining area. A logarithmic transformation was used to correct the skewed distribution, and based on the sorption of Cu on spectrally active soil constituents, the spectral bands associated with iron oxides were extracted from the visible and near-infrared (VNIR) region and used in the estimation. A genetic algorithm was adopted for band selection, and partial least squares regression was used to calibrate the estimation model. After transforming the distribution of Cu concentration, the accuracies (R2) of the estimation of Cu concentration using laboratory and field spectra separately were 0.94 and 0.96. The results indicate that Cu concentration in the mining area can be estimated using reflectance spectroscopy following correction of skewed distribution.

Performance Evaluation of Coal Fly Ash Based Zeolite A for Heavy Metal Ions Adsorption of Wastewater

One of the environmental characteristics of chemical industries is producing wastewater effluent that containing heavy metals, which are hazardous to the aquatic life and the human health. The purpose of this research is to evaluate the use of zeolite A as a sorbent for the heavy metal ions removal from wastewater. Zeolite A was synthesized from coal fly ash by fusion-hydrothermal method by the authors contains cation exchange capacity of 5.05 meq/g. This study used a series of artificial wastewater containing one and mixed heavy metal ions (Cu (II) and Zn (II)). The result showed that wastewater containing one heavy metal ion was almost fully adsorbed, for instance percentage sorption of Cu (II) and Zn (II) ions were 95.61 % and 92.15 %. On the other hand, for binary system, the percentage sorption slightly decreased becoming 91.51 % with the increase the amount of Zn (II) ion in solution. Based on kinetic data, sorption of Cu (II) and Zn (II) ions is controlled by pseudo-second order. In addition, adsorption isotherm follows Langmuir model. From this study, it is confirmed that zeolite A has a good possibility to be used as sorbent of heavy metal ions removal in wastewater.

Silica functionalized by pyridinecarboximidamides as a novel sorbent of heavy metals ions

ABSTRACT Two novel sorbents, obtained as a result of surface modification of silica gel for the Cu(II), Co(II) and Ni(II) removal from aqueous solutions were proposed. For the modification, 3-chloropropyltrimethoxysilane, N’-hydroxy-N,N-dioctylpyridine-3-carboximidamide and N’-hydroxy-N,N-dioctylpyridine-4-carboximidamides were used. A series of basic tests on the sorption of Cu(II), Co(II) and Ni(II) were carried out and the presented results indicated that the novel sorbents were able to remove all tested metals ions from the aqueous solutions, and the removal efficiency was dependent on the functionalised agent structure, dosage, metal ions concentration and pH. The Langmuir model also assumed that a monolayer sorption occurred.

Sorption studies of toxic cations on ginger root adsorbent

This research reports the feasibility of using pristine ginger root (PGR), base treated ginger root (BTGR) and acid treated ginger root (ATGR) adsorbents to simultaneously remove Cu(II), Pb(II) and Ni(II) ions from aqueous solution under different experimental parameters by batch method. Different system parameters such as the effect of metal concentration, time dependent studies and temperature effect were evaluated. The sorption trend indicated that the pretreated adsorbents; ATGR and BTGR had better performance than PGR. The sorption of Cu(II), Ni(II) and Pb(II) ions onto BTGR is 16.3, 18.9 and 17.6 mg/g onto ATGR is 15.3, 18.6 and 17.5 mg/g and onto PGR is 1.8, 1.9 and 1.9 mg/g respectively. The overall Cu/Ni/Pb ions sorption trend for the adsorbents is BTGR > ATGR > PGR. Freundlich isotherm best describes all the sorption processes in this work. The sorption rate results of Ni(II) ions was much faster than those of Pb(II) and Cu(II) in all the adsorbents. The good unity fits of PSO data suggests that Cu(II), Ni(II) and Pb(II) is better described by this model and the sorption mechanism is based on electrostatic interactions and adsorption sites. The ΔG° data gave negative values for all samples; suggesting that the sorption processes were spontaneous. The positive ΔS° figures indicated that the degree of freedom for Cu(II), Ni(II) and Pb(II) ions was not restricted on PGR, ATGR and BTGR adsorbents.

Sorption of Ni(II), Pb(II) and Cu(II) ions from aqueous solutions by cellulose grafted with poly(HEMA-co-AAc): Kinetic, isotherm and thermodynamic study

New cellulose-based Cell-g-HEMA-co-AAc copolymer was prepared through potassium persulfate initiated free radical polymerization of vinyl monomers hydroxyethyl methacrylate (HEMA) and acrylic acid (AAc) onto cellulose for the adsorptive uptake of a toxic Ni(II), Pb(II) and Cu(II) ions from aqueous solution. Maximum Pg (316.0) and GE (147.7%) for the grafting of AAc was obtained at 1.5 M ratios w.r.t. the concentration of the HEMA. Evidence of incorporation of new functional groups on cellulose after grafting was provided by FTIR, TGA/DTA, XRD and FESEM techniques. The maximum percent uptake (Pu) for Ni(II) and Pb(II) metal ions was observed 74.7% and 78.7% at pH 5.0. For Cu(II) ions 60.4% uptake was recorded at optimized pH 6.0. Cell-g-HEMA-co-AAc copolymer showed the preferential sorption of metal ions in order of Pb(II) > Ni(II) > Cu(II) at optimized conditions of 6 h of contact time and 30 °C temperature. From kinetic studies, the sorption of Ni(II) and Pb(II) metal ions was found to occur through chemisorption following pseudo-second-order kinetics model, whereas Cu(II) ions preferred physisorption and pseudo-first-order kinetics. A high determinant coefficient (R2) for the Langmuir model suggested monolayered sorption of metal ions. Negative values of ΔG° confirmed that the sorption of Ni(II) and Pb (II) on Cell-g-HEMA-co-AAc was thermodynamically favorable and highly spontaneous as compared to sorption of Cu(II) ions.

Thermodynamic spectral and kinetic analysis of the removal of Cu(II) from aqueous solution by sodium carbonate treated rice husk

A new adsorbent for removing copper ions from aqueous solutions has been developed and characterized. The present study deals with the sorption of Cu(II) from aqueous solution on chemically pretreated sodium carbonate-treated rice husk (SCRH). The physico-chemical characteristics of rice husks were investigated to analyze their suitability to adsorb Cu(II) ions from water and wastewater. The raw rice husk (RRH), SCRH and Cu(II) adsorbed rice husk were analyzed by SEM-EDAX analysis. FTIR spectroscopy was also applied to identify functional groups, capable of adsorbing metal ions. Batch kinetic studies were conducted for the adsorption of Cu(II) on SCRH. It has been observed that 92.9–96.0% removal of Cu(II) is achieved at 4.8 mg of Cu(II)/g of adsorbent, adsorbent dose of 10 g L–1 and initial Cu(II) concentration of 10 mg L–1 in a temperature range of 15–50 °C. It was observed that the adsorption of Cu(II) on SCRH followed pseudo second-order kinetic and time to achieve equilibrium was found to be 60 min. The maximum uptake (97%) of Cu (II) was observed at pH 6. In this paper, an attempt has also been made to develop simple and readily understandable thermodynamic parameters related to sorption process at the equilibrium for understanding the adsorption mechanism. The Gibbs free energy ΔG° values for the adsorption processes of Cu(II) at 15, 30, 40 and 50 °C were calculated as –6.16, –6.84, –8.01 and –8.53 kJ mol–1, respectively. The negative value of ΔG° indicates spontaneity of adsorption. The values of ΔH° and ΔS° for Cu(II) adsorption were calculated as 14.37 kJ mol–1 and 70.92 J K–1 mol–1, respectively. The activation energy for the adsorption of Cu(II) was found to be 9 kJ mol–1 which is a characteristic for diffusion limited processes.

Differences in Engineered Nanoparticle Surface Physicochemistry Revealed by Investigation of Changes in Copper Bioavailability During Sorption to Nanoparticles in the Aqueous Phase.

Sorption of chemical substances to nanoparticles (NPs) in the aqueous phase strongly influences NP physicochemisty, and investigations of these complex interactions can provide important insights into the environmental fate of NPs. The objective of the present study was to use differences in copper (Cu) bioavailability to investigate aqueous-phase sorption with NPs that had different physicochemical characteristics (silicon [Si], perovskite, and titanium dioxide NPs [TiO2 NPs]). Sorption of Cu with NPs was assessed by the presence of adsorbent in water and onto the NP surface after ultracentrifugation, and by changes in Cu bioavailability under static conditions during exposure of larval zebrafish, as well as under conditions of continuous agitation during exposure of the alga Chlorella vulgaris. The presence of TiO2 NPs reduced total Cu in the water column and Cu bioavailability (measured by growth inhibition, mortality, and metallothionein 2 gene expression), confirming Cu sorption to TiO2 NPs. Nanoparticle surface area was the most important factor that affected Cu sorption, as indicated by less bioavailable Cu in the presence of smaller TiO2 NPs. The surface area effect was consistent regardless of exposure conditions (alga, continuous agitation; zebrafish, static water) and was further supported by the fact that the lowest total Cu concentration in the water column was found in the presence of the smallest NP. The results differed with other NP types, for example, silicon NPs, in which Cu sorption was indicated by analytical chemistry, but sorption was not sufficient to significantly alter Cu bioavailability. The bioavailability tests did not indicate Cu sorption with perovskite NPs. The results demonstrate that surface area critically influences sorption, that Cu sorption as measured by bioavailability is not affected by agitation or static conditions, and that Cu sorption differs among types of NPs, indicating differences in their surface physicochemistry. Environ Toxicol Chem 2019;9999:1-11. © 2019 SETAC.

Interaction of Aqueous Cu2+ Ions with Granules of Crushed Concrete

The sorption of Cu2+ ions from synthetic wastewater using crushed concrete demolition waste (CCDW) which collected from a demolition site was investigated in a batch sorption system. Factors influencing on sorption process such as shaking time (0-300min), the initial concentration of contaminant (100-750mg/L), shaking speed (0-250 rpm), and adsorbent dosage (0.05-3 g/ml) have been studied. Batch experiments confirmed that the best values of these parameters were (180 min, 100 mg/l, 250 rpm, 0.7 g CCDW/100 ml) respectively where the achieved removal efficiency is equal to 100%. Sorption data were described using four isotherm models (Langmuir, Freundlich, Redlich-Peterson, and Radke-Prausnitz). Results proved that the pure adsorption and precipitation are the main mechanisms for removal of copper ions from aqueous solution onto CCDW and sorption data can be represented by Langmuir and Radke-Prausnitz model. The copper ion was successfully removed from aqueous solution during batch experiments using CCDW in the particle size range 2–1 mm. Scanning electron microscopy detected that the removal of Cu2+ was found to arise from surface precipitation.