Biosorption of Cr(VI) ions from aqueous solutions by a newly isolated Bosea sp. strain Zer-1 from soil samples of a refuse processing plant

The adsorption behavior of Cr(VI) ions from aqueous solution by a chromium-tolerant strain was studied through batch experiments. An isolate designated Zer-1 was identified as a species of Bosea on the basis of 16S rRNA results. It showed a maximum resistance to 550 mg·L−1 Cr(VI). The effects of 3 important operating parameters, initial solution pH, initial Cr(VI) concentration, and biomass dose, were investigated by central composite design. On the basis of response surface methodology results, maximal removal efficiency of Cr(VI) was achieved under the following conditions: pH, 2.0; initial concentration of metal ions, 55 mg·L−1; and biomass dose, 2.0 g·L−1. Under the optimal conditions, the maximum removal efficiency of Cr(VI) ions was found to be nearly 98%. The experimental data exhibited a better fit with the Langmuir model than the Freundlich model. The biosorption mechanisms were investigated with pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics models. These results revealed that biosorption of Cr(VI) onto bacterial biomass could be an alternative method for the removal of metal ions from aqueous solution.

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Removal of Strontium Ions from Aqueous Solution by Sunflower Straw

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1922 ◽

2013 ◽

Vol 726-731 ◽

pp. 1922-1925 ◽

Cited By ~ 1

Author(s):

Lian Ai ◽

Xue Gang Luo ◽

Xiao Yan Lin ◽

Si Zhao Zhang

Keyword(s):

Aqueous Solution ◽

Batch Adsorption ◽

Order Model ◽

Solution Ph ◽

Sorption Data ◽

Freundlich Model ◽

Pseudo Second Order ◽

Ft Ir ◽

Sunflower Straw ◽

Langmuir And Freundlich Models

The sorptive potential of sunflower straw (≤125 μm) for Sr2+ from aqueous solution was evaluated. Batch adsorption experiments were carried out as a function of solution pH, adsorbent dosage, Sr2+ concentration and contact time. FT-IR spectra and SEM of sunflower straw were employed to explore the functional groups available for the binding of Sr2+ and morphology of the adsorbent. Maximum uptake capacity of sunflower straw was 17.48 mg/g occurred at around pH 3-7. The adsorption equilibrium can be achieved within 5 min and kinetic data were fitted well to pseudo-second-order model. The Langmuir and Freundlich models were applied to describe isotherm sorption data. The Langmuir model gave an acceptable fit than Freundlich model.

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Study of the kinetics and the adsorption isotherm of cadmium(II) from aqueous solution using green algae (Ulva lactuca) biomass

Water Science & Technology ◽

10.2166/wst.2015.359 ◽

2015 ◽

Vol 72 (9) ◽

pp. 1505-1515 ◽

Cited By ~ 9

Author(s):

H. Asnaoui ◽

A. Laaziri ◽

M. Khalis

Keyword(s):

Aqueous Solution ◽

Metal Ions ◽

Low Cost ◽

Freundlich Isotherm ◽

Second Order ◽

Ulva Lactuca ◽

Order Kinetic ◽

Solution Ph ◽

Algae Biomass ◽

Pseudo Second Order

Batch experiments were conducted to study the adsorption of hazardous cadmium onto low-cost algae biomass in aqueous solution with respect to concentration of adsorbate, adsorbent dosage, contact time, solution pH and temperature. Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms and the isotherm constants were determined. The activation energy of adsorption was also evaluated for the adsorption of cadmium onto Ulva lactuca biomass. Experimental data were tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of Cd(II) followed well pseudo-second-order kinetics. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the metal ions by Ulva lactuca biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The biosorption capacity of Ulva lactuca biomass for cadmium was found to be 3.02 mg/g at pH 5.60 min equilibrium time and 20 °C. The mean free energy which was calculated was 6.24 kJ/mol for Cd(II) biosorption, which shows that the adsorption is physical. The calculated thermodynamic parameters (ΔG0, ΔH0 and ΔS0) showed that the biosorption of Cd(II) onto Ulva lactuca biomass was feasible, spontaneous and exothermic under examined conditions. The results indicate that algae Ulva lactuca could be employed as a low-cost material for the removal of metal ions from aqueous solution.

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Chromium and nickel metal ions removal from contaminated water using Nigerian bentonite clay

Water Practice & Technology ◽

10.2166/wpt.2021.031 ◽

2021 ◽

Author(s):

Jock Asanja Alexander ◽

Oboh Oseribo Innocent ◽

Uwem Ekwere Inyang ◽

Ganchok Lawrence ◽

Adeku Ojo

Keyword(s):

Metal Ions ◽

Bentonite Clay ◽

Textural Properties ◽

Order Kinetic ◽

Nickel Metal ◽

Batch Mode ◽

Freundlich Model ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Maximum Removal

Abstract In this work bentonite clay was characterized and investigated for the adsorption of chromium and nickel metal ions from aqueous solution. The clay calcined at 650 °C was characterized for physical, chemical and textural properties. Nickel sulphate hexahydrate (NiSO4.6H2O) and chromium tri oxide (Cr2O3) solutions were used as metal model compounds to evaluate the adsorption efficiency of the clay in a batch mode. The initial metal ions concentration range from 10 to 50 mg/L and the maximum removal efficiency was 99.40% for Cr (III) and 71.50% for Ni (II) metal ions. Langmuir and Freundlich models were utilized for the analysis of adsorption equilibrium isotherm. The experimental data fitted well into Freundlich model for Cr (III) with regression coefficient (R2) of 0.996 and the Langmuir model for Ni (II) having R2 value 0.994. The Pseudo second order kinetic model fitted well for both chromium and nickel and their adsorption from single metal solutions followed the order Cr > Ni. Highlight The local clay has not been reported in any scholarly journal or publication. Theremoval of nickel and chromium using this clay has been found effective. The dataobtained will form a baseline for references and learning purposes.

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Electrospun Cellulose Nanocrystals/Chitosan/Polyvinyl Alcohol Nanofibrous Films and their Exploration to Metal Ions Adsorption

Polymers ◽

10.3390/polym10101046 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1046 ◽

Cited By ~ 10

Author(s):

Dong Wang ◽

Wanli Cheng ◽

Yiying Yue ◽

Lihui Xuan ◽

Xiaohui Ni ◽

...

Keyword(s):

Polyvinyl Alcohol ◽

Metal Ions ◽

Cellulose Nanocrystals ◽

Solution Ph ◽

Electrospinning Technique ◽

Freundlich Model ◽

Adsorption Time ◽

Loading Level ◽

Pseudo Second Order ◽

Adsorption Desorption

Cellulose nanocrystals/chitosan/polyvinyl alcohol (CNC/CS/PVA) composite nanofibrous films were prepared while using an electrospinning technique and successfully thiol-functionalized. Then, the modified films were used for the sorption-desorption of Cu(II) and Pb(II) ions. Subsequently, the adsorption capacity of the films was investigated by changing the CNC loading level, solution pH, and adsorption time. Results showed that the adsorption of metal ions by the films was the best with CNC loading level of 5 wt %, pH of 6, and adsorption time of 4 h. The adsorption behavior of the films was agreed with the Freundlich model. The adsorption equation of metal ions could be described while using a pseudo-second order model. Based on the Langmuir model, the maximum adsorption capacities of Cu(II) and Pb(II) ions were estimated to be 484.06 and 323.49 mg/g, respectively. The Cu(II) and Pb(II) ions adsorption efficiencies of the films after 4 adsorption-desorption cycles were 90.58% and 90.21%, respectively. This study may provide a feasible approach for the application of functional CNC/CS/PVA nanofibrous films in the treatment of water.

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The nature and kinetics of 2,4-dimethylphenol adsorption in aqueous solution on biochar derived from Sargassum boveanum macroalgae

Journal of Water Supply Research and Technology—AQUA ◽

10.2166/aqua.2020.142 ◽

2020 ◽

Vol 69 (5) ◽

pp. 438-452 ◽

Cited By ~ 1

Author(s):

Mazen K. Nazal ◽

Durga Rao ◽

Nabeel Abuzaid

Keyword(s):

Aqueous Solution ◽

Contact Time ◽

Maximum Adsorption Capacity ◽

Solution Ph ◽

Experimental Conditions ◽

Freundlich Model ◽

Adsorptive Removal ◽

Adsorbate Concentration ◽

Pseudo Second Order ◽

Kinetics Of

Abstract Many industries produce 2,4-dimethylphenol (DMP) compound in the wastewater which is persistent, toxic, and carcinogenic. Therefore, an adsorbent was prepared by carbonizing a dried Sargassum boveanum macroalgae. The prepared biosorbent was investigated for adsorptive removal of DMP from aqueous solution. After carbonization, the biochar derived from S. boveanum macroalgae (BCM) removed almost 100% of DMP adsorbate. Effects of contact time, solution pH, adsorbate concentration, adsorbent mass, and temperature have been studied. It has been found that, within the experimental conditions, the maximum adsorption capacity is 17 mg/g, rate of adsorption follows pseudo-second order kinetics and the adsorption isotherm experimental data fit the Freundlich model. The thermodynamic parameters were calculated and it has been found that the adsorption of DMP on BCM is endothermic and thermodynamically favorable, and in addition the surface of BCM adsorbent shows affinity to the DMP molecules. The BCM adsorbent has the capability to remove around 65% of DMP from high saline seawater contaminated with DMP. Moreover, the prepared BCM adsorbent was reusable for at least four times in seawater for removal of DMP contaminant.

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REMOVAL OF HEAVY METAL Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II) IONS FROM AQUEOUS SOLUTION BY MENTHA PIPERITA EXTRACT

10.32006/eeep.2020.2.1520 ◽

2020 ◽

pp. 15-20

Author(s):

Ersin Yucel ◽

Mine Yucel

Keyword(s):

Aqueous Solution ◽

Metal Ions ◽

High Efficiency ◽

Correlation Coefficients ◽

Langmuir Model ◽

Mentha Piperita ◽

Freundlich Model ◽

Biosorption Capacity ◽

Peppermint Extract ◽

The Stability

In this study, the usage of the peppermint (Mentha piperita) for extracting the metal ions [Mg (II), Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II)] that exist at water was investigated. In order to analyze the stability properties, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used at removing the metal ions and the highest correlation coefficients (R2) were obtained at Langmuir isotherm. Therefore, it is seen that the Langmuir model is more proper than the Freundlich model. However, it was found that the correlation coefficients of removing Ni and Cd is higher at Freundlich model than Langmuir and low at Dubinin-Radushkevich isotherm. It is established that the biosorption amount increase depends on the increase of biosorbent and it can be achieved high efficiency (95%) even with small amount (0.6 mg, peppermint extract) at lead ions. It is also determined that the peppermint extracted that is used at this study shows high biosorption capacity for metal ions and can be used for immobilization of metals from polluted areas.

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Comparative Bio-sorption of Cadmium and Nickel Ions from Aqueous Solution onto Fibers of Date Palm using Fluidized Bed Column

Revista de Chimie ◽

10.37358/rc.19.5.7160 ◽

2019 ◽

Vol 70 (5) ◽

pp. 1507-1512

Author(s):

Baker M. Abod ◽

Ramy Mohamed Jebir Al-Alawy ◽

Firas Hashim Kamar ◽

Gheorghe Nechifor

Keyword(s):

Aqueous Solution ◽

Heavy Metal ◽

Metal Ions ◽

Fluidized Bed ◽

Removal Efficiency ◽

Heavy Metal Ions ◽

Date Palm ◽

Operating Conditions ◽

Initial Concentration ◽

Bed Height

The aim of this study is to use the dry fibers of date palm as low-cost biosorbent for the removal of Cd(II), and Ni(II) ions from aqueous solution by fluidized bed column. The effects of many operating conditions such as superficial velocity, static bed height, and initial concentration on the removal efficiency of metal ions were investigated. FTIR analyses clarified that hydroxyl, amine and carboxyl groups could be very effective for bio-sorption of these heavy metal ions. SEM images showed that dry fibers of date palm have a high porosity and that metal ions can be trapped and sorbed into pores. The results show that a bed height of 6 cm, velocity of 1.1Umf and initial concentration for each heavy metal ions of 50 mg/L are most feasible and give high removal efficiency. The fluidized bed reactor was modeled using ideal plug flow and this model was solved numerically by utilizing the MATLAB software for fitting the measured breakthrough results. The breakthrough curves for metal ions gave the order of bio-sorption capacity as follow: Cd(II)]Ni(II).

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Eggshell Powder as an Adsorbent for Removal of Fluoride from Aqueous Solution: Equilibrium, Kinetic and Thermodynamic Studies

E-Journal of Chemistry ◽

10.1155/2012/790401 ◽

2012 ◽

Vol 9 (3) ◽

pp. 1457-1480 ◽

Cited By ~ 47

Author(s):

R. Bhaumik ◽

N. K. Mondal ◽

B. Das ◽

P. Roy ◽

K. C. Pal ◽

...

Keyword(s):

Aqueous Solution ◽

Adsorption Process ◽

Low Cost ◽

Fluoride Removal ◽

Contaminated Water ◽

Fluoride Adsorption ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Kinetic And Thermodynamic Studies ◽

Maximum Removal

A new medium, eggshell powder has been developed for fluoride removal from aqueous solution. Fluoride adsorption was studied in a batch system where adsorption was found to be pH dependent with maximum removal efficiency at 6.0. The experimental data was more satisfactorily fitted with Langmuir isotherm model. The kinetics and the factor controlling adsorption process fully accepted by pseudo-second-order model were also discussed. Eawas found to be 45.98 kJmol-1by using Arrhenius equation, indicating chemisorption nature of fluoride onto eggshell powder. Thermodynamic study showed spontaneous nature and feasibility of the adsorption process with negative enthalpy (∆H0) value also supported the exothermic nature. Batch experiments were performed to study the applicability of the adsorbent by using fluoride contaminated water collected from affected areas. These results indicate that eggshell powder can be used as an effective, low-cost adsorbent to remove fluoride from aqueous solution as well as groundwater.

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Removal of Heavy Metals from Aqueous Solution by Hydroxyapatite/Chitosan Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.789.176 ◽

2013 ◽

Vol 789 ◽

pp. 176-179 ◽

Cited By ~ 3

Author(s):

Eny Kusrini ◽

Nofrijon Sofyan ◽

Dwi Marta Nurjaya ◽

Santoso Santoso ◽

Dewi Tristantini

Keyword(s):

Heavy Metals ◽

Aqueous Solution ◽

Metal Ions ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Removal Of Heavy Metals ◽

Sem Micrograph ◽

Pseudo Second Order ◽

Chitosan Composite

Hydroxyapatite/chitosan (HApC) composite has been prepared by precipitation method and used for removal of heavy metals (Cr6+, Zn2+and Cd2+) from aqueous solution. The HAp and 3H7C composite with HAp:chitosan ratio of 3:7 (wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy. The SEM results showed that HAp is spherical-shaped and crystalline, while chitosan has a flat structure. SEM micrograph of 3H7C composite reveals crystalline of HAp uniformly spread over the surface of chitosan. The crystal structure of HAp is maintained in 3H7C composite. Chitosan affects the adsorption capacity of HAp for heavy metal ions; it binds the metal ions as well as HAp. The kinetic data was best described by the pseudo-second order. Surface adsorption and intraparticle diffusion take place in the mechanism of adsorption process. The binding of HAp powder with chitosan made the capability of composite to removal of Cr6+, Zn2+and Cd2+from aqueous solution effective. The order of removal efficiency (Cr6+> Cd2+> Zn2+) was observed.

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