Lead, copper and zinc biosorption from bicomponent systems modelled by empirical Freundlich isotherm

Sağ, Yeşim; Kaya, Arzu; Kutsal, Tülin

doi:10.1007/s002530050031

Cited by 29 publications

(2 citation statements)

References 9 publications

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“…The maximum adsorption capacities (q max ) for Cu 2 þ on MC, CER and AC were found to be 53.19, 89.29 and 5.82 mg/g, respectively (Table 1). For Freundlich isotherm, the adsorption intensity (1/n) reflects the system suitability, and the adsorption is considered to be favourable when 1/n , 1 (Sag et al, 2000). In the present work, 1/n ¼ 0.29, which indicated the adsorption of Cu 2 þ by MC was favourable.…”

Section: Adsorption Isothermsmentioning

confidence: 51%

Adsorption of copper ion on magnetite-immobilised chitin

Wong

Sh³

et al. 2007

Water Science and Technology

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The adsorption of Cu2+ from aqueous solution by magnetite-immobilised chitin (MC) was studied in batch mode. Two conventional adsorbents, cation exchange resin (CER) and activated carbon (AC) were used for the comparison. The physicochemical parameters including pH, concentration of adsorbent, temperature and initial Cu2+ concentration were optimised. Under the optimised conditions, the removal efficiencies of Cu2+ for MC, CER and AC were 91.67, 93.36 and 89.16%, respectively. In addition, the removal capacities of Cu2+ for MC, CER and AC were 56.71, 74.84 and 6.55 mg/g, respectively. The adsorption isotherm studies indicated that the adsorptive behaviour of Cu2+ on three adsorbents could be well described by the Langmuir model. The maximum adsorption capacities (qmax) for MC, CER and AC were 53.19, 89.29 and 5.82 mg/g, respectively. The applicability of the kinetic model has been investigated for MC. Experimental results indicated that a pseudo-second-order reaction model provided the best description of the data with a correlation coefficient 0.999 for different initial Cu2+ concentrations. The rate constants were also determined. Various thermodynamic parameters such as standard free energy (DeltaG 0), enthalpy (DeltaH 0) and entropy (DeltaS 0) were calculated for predicting the adsorption nature of MC. The results indicated that this system was a spontaneous and endothermic process.

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Section: Adsorption Isothermsmentioning

confidence: 51%

Adsorption of copper ion on magnetite-immobilised chitin

Wong

Sh³

et al. 2007

Water Science and Technology

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“…The co-presence of multiple metal cations elicited inhibitory effects in the cation binding process, stemming from the competition for binding sites on both bacterial cell surfaces and extracellular polymeric substances (EPS). It has been reported that in solutions containing multiple metals, some of the metal cations already bound on the EPS exert a strong hindrance to the access of other cations at the adjacent adsorption sites ( Sag et al, 2000 ; Micheletti et al, 2008 ; Pradhan and Rai, 2011 ; Lu et al, 2021 ). This steric effect results in EPS conformational change ( Huang et al, 2022 ) that leads to the general reduction in metal removal.…”

Section: Discussionmentioning

confidence: 99%

Metal tolerance and biosorption capacities of bacterial strains isolated from an urban watershed

Pagnucco,

Overfield,

Chamlee

et al. 2023

Front. Microbiol.

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Rapid industrialization and urbanization have led to widespread metal contamination in aquatic ecosystems. This study explores the metal tolerance and biosorption characteristics of four bacterial strains (Serratia sp. L2, Raoultella sp. L30, Klebsiella sp. R3, and Klebsiella sp. R19) isolated from Saint Clair River sediments. These strains effectively removed various metal cations (As3+, Pb2+, Cu2+, Mn2+, Zn2+, Cd2+, Cr6+, and Ni2+) in single and multi-metal solutions. Minimum inhibitory concentration (MIC) assays revealed strain-specific variations in metal tolerance, with L2 and L30 exhibiting higher tolerance. Surprisingly, R3 and R19, despite lower tolerance, demonstrated superior metal removal efficiency, challenging the notion that tolerance dictates removal efficacy. In single-metal solutions, R3 and R19 excelled at extracting various metal ions, while competitive binding in multi-metal solutions hindered removal. However, R3 and R19 retained higher removal efficiencies, possibly due to enhanced flocculation activities facilitating metal-ion contact. Comprehensive Fourier-transform infrared (FTIR) analysis highlighted the strains’ metal-binding capabilities, with novel peaks emerging after metal exposure, indicative of extracellular polymeric substance (EPS) production. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) confirmed metal accumulation on bacterial surfaces and within cytoplasmic regions and revealed morphological changes and metal adsorption patterns, emphasizing the strains’ ability to adapt to metal stress. Scanning transmission microscopy (STEM) and EDX analysis uncovered metal accumulation within bacterial cells, underscoring the complexity of microbial-metal interactions. This study also confirms that the simultaneous presence of an aqueous solution may cause a mutual inhibition in the adsorption of each metal to the EPS resulting in reduced metal uptake, which emphasizes the need to select specific bacterial strains for a given metal-containing effluent. The differences in metal distribution patterns between Klebsiella sp. R19 and Raoultella sp. L30 suggest species-specific metal accumulation strategies driven by environmental conditions and metal availability. The heavy metal-removing capabilities and the ability to grow over a wide range of metal concentrations of the strains used in this study may offer an advantage to employ these organisms for metal remediation in bioreactors or in situ.

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Cd(II), Pb(II) and Zn(II) Removal from Contaminated Water by Biosorption Using Activated Sludge Biomass

Ahmad

Ghufran

Faizal

2010

CLEAN Soil Air Water

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Biosorption using activated sludge biomass (ASB) as a potentially sustainable technology for the treatment of wastewater containing different metal ions (Cd(II), Pb(II) and Zn(II)) was investigated. ASB metal uptake clearly competed with protons consumed by microbial biomass compared with control tests with non-activated sludge biomass. Biosorption tests confirmed maximum exchange between metal ions and protons at pH 2.0 -4.5. It was revealed by the study that the amount of metal ions released from the biomass increased with biomass sludge concentration. The result showed that maximum absorption of metal ions was observed for Cd(II) at pH 3.5, Pb(II) at pH 4.0, and pH 4.5 for Zn(II) ions. The maximum absorption capacities of ASB for Cd(II), Pb(II) and Zn(II) were determined to be 59.3, 68.5 and 86.5%, respectively. The biosorption of heavy metals was directly proportional to ASB stabilization corresponding to a reduction in heavy metals in the order of Cd a Pb a Zn. The order of increase of biosorption of metal ions in ASB was Zn(II) a Pb(II) a Cd(II), and this was opposite to that of non active sludge. The results indicate that ASB is a sustainable tools for the bioremediation of Cd(II), Pb(II) and Zn(II) ions from industrial sludge and wastewater treatment plants.

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Lead, copper and zinc biosorption from bicomponent systems modelled by empirical Freundlich isotherm

Cited by 29 publications

References 9 publications

Adsorption of copper ion on magnetite-immobilised chitin

Adsorption of copper ion on magnetite-immobilised chitin

Metal tolerance and biosorption capacities of bacterial strains isolated from an urban watershed

Cd(II), Pb(II) and Zn(II) Removal from Contaminated Water by Biosorption Using Activated Sludge Biomass

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