Sorption Of Zinc Research Articles

Synthesis and appraisal of a hydroxyapatite/pectin hybrid material for zinc removal from water.

A simple method to modify hydroxyapatite and pectin into an efficient zinc sorbent was investigated. Process and formulation modifications enabled the formation of a flower-like hydroxyapatite/pectin hybrid material. The hybrid material was characterized with scanning electron microscopy, elemental analysis, and zeta potential tests. Sorption data were analyzed with different kinetic and isotherm models. The results showed that the pseudo-second order kinetic model and two-staged isotherm curves with Langmuir at the first stage and a Freundlich model the at second stage could best describe the zinc sorption on the hybrid. The maximum experimental sorption capacity was 330.4 mg Zn2+ per gram of sorbent, which was obtained with an initial concentration of 260 mg L−1 Zn2+ at pH 5.0. pH monitoring and Zeta potential tests suggested surface complexation and electrostatic attraction were fundamental in the zinc sorption process.

Effects of resuspension on the mobility and chemical speciation of zinc in contaminated sediments.

Identifying and quantifying the processes governing the mobilization of metals during resuspension events is key to assessing long-term metals efflux from sediments and associated ecological impacts. We investigated the effects of sediment resuspension on the mobilization and chemical speciation of zinc in two-week-long batch experiments using metal-contaminated sediments from Lake DePue (IL, USA). Measurements of dissolved zinc and sulfate allowed us to characterize the kinetics of metal sulfide dissolution and the resulting net release of zinc to the aqueous phase. X-ray absorption spectroscopy (XAS) provided direct insights into the chemical speciation of iron and zinc and their dynamic transformations during resuspension. While ZnS rapidly oxidized during resuspension, dissolved zinc increased only after two days of resuspension. We proposed a kinetic model to explain changes in the chemical speciation of zinc during these experiments as constrained by the dissolved species concentrations and chemical speciation as informed by XAS. Only 15% of the zinc mobilized was released to the aqueous phase while the remaining fraction repartitioned the solid phase either as a carbonate precipitate or as a sorbed species. Our results show that zinc sorption onto particle surfaces and reprecipitation of zinc minerals limit zinc solubility during resuspension of metal-sulfide sediments.

Combining Path Analysis and X‐Ray Absorption Spectroscopy to Unravel the Zn Sorption Mechanism on Soils

Core Ideas pH, clay content, and FeDCB played direct roles in Zn adsorption. Zinc sorption on alkaline soils was higher than on acidic soils as a result of the formation of Zn‐precipitate. Clay content affected Zn sorption on soils via FeDCB and cation exchange capacity. Zinc accumulation in soils due to increasing industrial activities can change this plant nutrient into a pollutant. Soil properties significantly affect the sorption and bioavailability of Zn in soils. Twenty‐one soils with different characteristics were collected from the Jiangsu Province, China, to ascertain the effect of soil properties on Zn sorption. A combination of path analysis and x‐ray absorption spectroscopy (XAS) was conducted to elucidate the sorption mechanism of Zn on soils. The results of XAS indicated that Zn sorption on alkaline soils was higher than on acidic soils because of the formation of a Zn‐precipitate [Zn‐Al layered double hydroxide (LDH), ZnCO3, and Zn(HO)2–2ZnCO3]. Although cation exchange is involved, it was not the primary mechanism of Zn sorption on soils. The correlation and path analysis indicated that pH, clay content, and dithionite‐citrate‐bicarbonate extractable Fe (FeDCB) played direct roles in Zn sorption, in which pH was the dominant factor. The clay content affected Zn sorption on soils measured via FeDCB and cation exchange capacity (CEC) based on the indirect coefficient. The high proportion of Zn‐clay minerals (Zn‐kaolinite, Zn‐illite, Zn‐montmorillonite, and Zn‐vermiculite) further illustrated that soil clay content was the primary factor affecting Zn sorption on soils.

Differential Sorption Behavior of Cadmium, Lead, Zinc, and Copper in Some Tropical Soils and Their Environmental Implications

ABSTRACTThis study evaluated cadmium (Cd), lead (Pb), zinc (Zn), and copper (Cu) sorption characteristics of three tropical soils. Data obtained conformed to Freundlich sorption model and the S-shaped isotherm curve. Sorption efficiency of Zn and Pb were highest in alkaline soil while slightly acid soil had the highest Cd and Cu sorption efficiency for monometal sorption. In competitive sorption, metals were more sorbed in slightly acid soil while the least efficiency was recorded in acid soil. Distribution coefficient; Kd (average across soil types) in monometal sorption followed the order: Pb > Zn > Cd > Cu. For competitive sorption, the order was Zn > Pb > Cu > Cd. When in competition, Cd was preferentially sorbed in slightly acid and alkaline soils and Zn for acid soil. Conclusively, lead is more in equilibrium solution when in competition with Cd, Zn and Cu making it potential agent of soil and groundwater pollution.

Complex 69mZnLigCl2 (Lig is N-(5,6-dihydro-4H-1,3-thiazin-2-yl)benzamide) as a potential radiopharmaceutical

The cytotoxicity of complex 69mZnLigCl2 (Lig is N-(5,6-dihydro-4H-1,3-thiazin-2-yl) benzamide) against the K-562 cell line (chronic myeloid leukemia) was considered in comparison with the cells of healthy donors. The 69mZnLigCl2 complex was obtained and characterized by TLC and autoradiography methods. The kinetics of zinc sorption on hydroxyapatite was studied.

Correction to: Biosolids application affects the competitive sorption and lability of cadmium, copper, nickel, lead, and zinc in fluvial and calcareous soils.

Unfortunately, in the original publication of the article, Prof. Yong Sik Ok's affiliation was incorrectly published.

Corrigendum to "Characteristics of kinetic, thermodynamic and design equations for the analysis of nickel and zinc sorption onto impregnated activated carbon" by W.F. Zaher, A.M.M. Eltorky, O.A. Abdel Moamen published in vol. 101 (2018) pp. 254–267 (DOI: 10.5004/dwt.2018.21757)

Corrigendum to "Characteristics of kinetic, thermodynamic and design equations for the analysis of nickel and zinc sorption onto impregnated activated carbon" by W.F. Zaher, A.M.M. Eltorky, O.A. Abdel Moamen published in vol. 101 (2018) pp. 254–267 (DOI: 10.5004/dwt.2018.21757)

Characteristics of kinetic, thermodynamic and design equations for the analysis of nickel and zinc sorption onto impregnated activated carbon

Characteristics of kinetic, thermodynamic and design equations for the analysis of nickel and zinc sorption onto impregnated activated carbon

Interaction of Copper, Zinc, and Manganese Cations with Lignite and Humic Acids

By IR Fourier spectroscopy, EPR, and 13C NMR analysis in solids, the sorption of copper, zinc, and manganese cations by various materials from aqueous solutions is studied. The materials considered are Tyul’gansk lignite, Tisul’sk lignite in unoxidized and oxidized forms, humic acids, and the coal residues remaining after separation of the humic acids. The zinc cations are sorbed by ion exchange; copper and manganese cations are sorbed by a mixed mechanism: ion exchange and complex formation. All the samples are selective in terms of sorption of the cations: Cu2+ > Zn2+ > Mn2+.

Sorption isotherms of metal ions onto an N-(2-sulfoethyl)chitosan-based material from single- and multi-component solutions

ABSTRACTThe scope of work is to study the mutual influence of metal ions during their sorption by sulfoethylated chitosan. The sorption isotherms of metal ions from single- and multi-component solutions are obtained. The sorption capacity of the sorbent towards Ag(I) and Cu(II) is revealed to be 1.63 and 1.41 mmol/g in single-, and 1.40 and 0.85 mmol/g in five-component solution. By comparing the affinity parameter and capacity of sulfoethylated chitosan towards ions in single- and multi-component solutions, it is concluded that Ag(I) and Cu(II) ions suppress the sorption of cobalt(II), nickel(II), zinc(II), cadmium(II), magnesium(II), calcium(II), strontium(II), barium(II), manganese(II) and lead(II).

Sorption and desorption of potentially toxic metals (Cd, Cu, Ni and Zn) by soil amended with bentonite, calcite and zeolite as a function of pH

Sorption and desorption studies of cadmium (Cd), copper (Cu), nickel (Ni) and zinc (Zn) were carried out at the pH range of 2 to 9 by a soil amended with three sorbents including bentonite, calcite and zeolite. A geochemical computer model was used to simulate the sorption of metals by control and amended soils as influenced by pH. Metals sorption on control and amended soils was dependent on pH, and increased with increasing equilibrium pH. Furthermore, metals sorption on soil amended by sorbents was greater than control, indicating the increase of soil sorption capacity by adding sorbents, while their desorption decreased. The modeling results indicated that the sorption of metals was modeled successfully using the ion exchange and surface complexation reactions. In general, the maximum sorption of metals was observed by bentonite-amended soil and calcite-amended soil, whereas the maximum desorption of all metals obtained in zeolite-amended soil, suggesting that the sorption of metals on zeolite was based on the reversible mechanism. In general, the sequence of metals sorption at pH2 to 9 for all treatments was in order of Cu>Zn>Cd≥Ni. In addition, this sequence was observed mostly for metals activity and desorption (occasionally an exchange in the positions of Cd and Ni) but with an inverse trend. Results indicated that distribution coefficient (Kd) increased with increasing pH and, in particular, had a sharp increase at the neutral to alkaline pH.

Kinetic Modelling of the Removal of Multiple Heavy Metallic Ions from Mine Waste by Natural Zeolite Sorption

This study investigates the sorption of heavy metallic ions (HMIs), specifically lead (Pb2+), copper (Cu2+), iron (Fe3+), nickel (Ni2+) and zinc (Zn2+), by natural zeolite (clinoptilolite). These HMIs are combined in single-, dual-, triple-, and multi-component systems. The batch mode experiments consist of a total initial concentration of 10 meq/L normality for all systems, acidified to a pH of 2 by concentrated nitric (HNO3) acid. A zeolite dosage of 4 g per 100 mL of synthetic nitrate salt aqueous solution is applied, for a contact period of 5 to 180 min. Existing kinetic models on HMIs sorption are limited for multi-component system combinations. Therefore, this study conducts kinetic analysis by both reaction and diffusion models, to quantify the sorption process. The study concludes that the process correlates best with the pseudo-second-order (PSO) kinetic model. In the multi-component system combining all five HMIs, the initial sorption rate and theoretical equilibrium capacity are determined as 0.0033 meq/g·min and 0.1159 meq/g, respectively. This provides significant insight into the mechanisms associated with the sorption process, as well as contributing to the assessment of natural zeolite as a sorbent material in its application in industrial wastewater treatment.

Effect of pH on Removal of Cu, Cd, Zn, and Ni by Cement Kiln Dust in Aqueous Solution

ABSTRACTA batch experiment was conducted to study the effect of pH on the sorption of copper (Cu), cadmium (Cd), zinc (Zn), and nickel (Ni) by cement kiln dust (CKD). The experiment was carried out by adding 25 mL of solutions containing concentrations of 200, 400, 600, 800, and 1000 mg/L of each of these heavy metal cations to 1.00 g of CKD. The pH of these suspensions was adjusted to 2, 5, and 7 as well as non-adjusted. The sorbed amount (Cs) and the sorption percentage of Cu, Cd, Zn, and Ni by CKD increased with increasing the suspension pH. The adsorption data of Cu, Cd, Zn, and Ni were generally well correlated with Langmuir model when the suspension pH was adjusted to 5, 7, non-adjusted and 7, respectively. However, they could be well described by Freundlich model when the suspension pH was adjusted to 5, 2, non-adjusted and 5, respectively.

Zinc sorption by different soils as affected by selective removal of carbonates and hydrous oxides

Zinc is relatively abundant compared to other trace elements and can be highly mobile in the soil-plant system. We aimed to determine the importance of CaCO3 and oxides as two important soil constituents which affect Zn sorption in eight soils of the Southeastern Mediterranean varying in stage of weathering, origin, and properties. We removed CaCO3 and Al, Fe, Mn, and Si oxides from the soils and compared Zn sorption in the untreated soils with that in the CaCO3- and the oxides-removed soils. We found that sorption decreased considerably from 83 to 98% with CaCO3 removal in all soils and decreased further when oxides were removed from 85 to over 99% as compared to the control. The lowered sorption was confirmed by comparing Zn distribution coefficient, Kd,mean, among treated and untreated soils. This revealed that Kd,mean decreased by approximately two orders of magnitude with CaCO3 and oxides removal. Maximum Kd,mean value in untreated soils was 4886 L kg−1 (lacustrine soil); in the CaCO3-removed soils maximum Kd,mean was 143 (Histosols), and in the oxides-removed soils it was 126.5 L kg−1 (Vertisols). Zinc sorption was less affected by oxides removal in the low amorphous (oxalate-extracted) oxides-content soils, due to the reactive nature of these oxides. In the CaCO3-removed soils, Al and Fe amorphous oxides were the soil constituents that mainly affected Zn sorption. We conclude that in acidic soils with low oxides content, the addition of Fe and Al amorphous reactive oxides may result in reduced metal mobility due to enhanced sorption. This approach might be useful for future remediation options of Zn-contaminated soils.

Biosolids application affects the competitive sorption and lability of cadmium, copper, nickel, lead, and zinc in fluvial and calcareous soils.

The objective of this research was to investigate the effects of biosolids on the competitive sorption and lability of the sorbed Cd, Cu, Ni, Pb, and Zn in fluvial and calcareous soils. Competitive sorption isotherms were developed, and the lability of these metals was estimated by DTPA extraction following their sorption. Sorption of all metals was higher in the fluvial than in the calcareous soil. Sorption of Cu and Pb was stronger than that of Cd, Ni, and Zn in all soils. Biosolids application (2.5%) reduced the sorption of all metals especially Cu and Pb (28-43%) in both soils (especially the calcareous soil) at the lower added metal concentrations (50 and 100mgL-1). However, it increased the sorption of all metals especially Pb and Cu in both soils (especially the calcareous soil; 15.5-fold for Cu) at the higher added concentrations (250 and 300mgL-1). Nickel showed the highest lability followed by Cd, Zn, and Pb in both soils. Biosolids increased the lability of the sorbed Ni in the fluvial soils at all added concentrations and the lability of Cd, Pb, and Zn at 50mgL-1, but decreased the lability of Cd, Pb, and Zn at 250 and 300mgL-1 in both soils. We conclude that at low loading rate (e.g., 50mgL-1) biosolids treatment might increase the lability and environmental risk of Cd, Cu, Pb, and Zn. However, at high loading rate (e.g., 300mgL-1) biosolids may be used as an immobilizing agent for Cd, Cu, Pb, Zn and mobilizing agent for Ni.

Sorption of Zinc (II) and Copper (II) Ions from Synthetic Wastewater by Yam (Dioscorea Rotundata) Peel Waste Biosorbent

There is a growing concern about the potential health hazard posed by heavy metals in the environment. The removal of metals from individual wastewater has become of primary importance because contamination of wastewater by heavy metals is a very serious environmental and health problem. Some of the existing methods of wastewater treatment are beyond the abilities of many local industries. Of recent, the use of non-living biomaterials as metal-binding compounds has been gaining advantage because the high levels of contamination do not affect them. Moreover, they require minimum care and maintenance and can be obtained cheaply. In this study acid-activated yam peel waste biosorbent was used for the removal of Zn (II) and Cu (II) ions from synthetic wastewater under batch test conditions. The effects of initial concentration (15-55mg/l) and contact time (20-100min) on removal performance were investigated with maximum removal efficiencies of 38% and 89% obtained for Cu (II) and Zn (II) respectively within 100 min. The Langmuir isotherm model provided a better fit for the equilibrium data obtained. Furthermore, adsorption of both metals was best described by the pseudo second order kinetic model based on the higher correlation coefficients and smaller error values obtained from statistical analysis. The findings of this study indicate the potential of this biosorbent for heavy metal removal applications.

Sorption of Metal Ions by New Sulfur-Containing Ionite GMA-MMA-TDGA

А new polyethyleneimine sulfur-containig exchanger network structure with static exchange capacity of 0.1 N solution of HCl 4.7 mEq/g was obtained by polycondensation of glycidyl methacrylate, methyl methacrylate and phosphoric acid. Sorption of copper (II) and zinc (II) ions was studied and investigated in static conditions from model solutions of sulfates of copper and zinc, in dependence on their concentration and pH, as well as their contact time with the ion-exchanger. Found that the magnitude of the sorption capacity of the ion exchanger for ions of copper (II) at pH 3.6 CuSO4 solution is 4.03 mg / g. It has been established that zinc ion (II) is absorbed best by the sorbent at pH 4.06. In these conditions the sorption capacity of the sorbent for copper ions (II) and zinc (II) respectively equal to 0.8225mmol / g (Cu) and 0.8305mmol / g (Zn). The sorption ability new sulfur-containing ionite with respect to copper ions (II) and zinc (II) is significantly higher than for industrial ionite of KU-2x8.

Sorption and cytotoxicity of zinc on hydroxyapatite

The preparation, physicochemical properties, and cytotoxicity of zinc-containing hydroxyapatites (HAP) were considered for further using HAP as carriers for zinc-containing drugs and radiopharmaceuticals.

Prediction of simultaneous sorption of copper(II), cobalt(II) and zinc(II) contaminants from water systems by a novel multi-functionalized zirconia nanofiber

Prediction of simultaneous sorption of copper(II), cobalt(II) and zinc(II) contaminants from water systems by a novel multi-functionalized zirconia nanofiber

Effects of clay minerals, hydroxides, and timing of dissolved organic matter addition on the competitive sorption of copper, nickel, and zinc: A column experiment

Infiltration of heavy metal (HM) polluted wastewater can seriously compromise soil and groundwater quality. Interactions between mineral soil components (e.g. clay minerals) and dissolved organic matter (DOM) play a crucial role in determining HM mobility in soils. In this study, the influence of the timing of addition of DOM, i.e. concurrent with or prior to HMs, on HM mobility was explored in a set of continuous flow column experiments using well defined natural soil samples amended with goethite, birnessite and/or smectite. The soils were subjected to concurrent and sequential additions of solutions of DOM, and Cu, Ni and Zn. The resulting breakthrough curves were fitted with a modified dose-response model to obtain the adsorption capacity (q0). Addition of DOM prior to HMs moderately enhanced q0 of Cu (8–25%) compared to a control without DOM, except for the goethite amended soil that exhibited a 10% reduction due to the blocking of binding sites. Meanwhile, for both Zn and Ni sequential addition of DOM reduced q0 by 1–36% for all tested soils due to preferential binding of Zn and Ni to mineral phases. In contrast, concurrent addition of DOM and HMs resulted in a strong increase of q0 for all tested metals and all tested soil compositions compared to the control: 141–299% for Cu, 29–102% for Zn and 32–144% for Ni. Our study shows that when assessing the impact of soil pollution through HM containing wastewater it is crucial to take into account the presence of DOM.