Application of Chemically Modified Industrial Slag to As(III) Adsorption from Wastewater: Kinetics and Mass Transfer Analysis

In the present study, brick kiln slag (BKS) has been utilized for low concentration As(III) adsorption in batch mode. BKS was modified with H2SO4 (SA) and NaOH (SB) for enhancing As(III) uptake capacity. Maximum adsorption capacity (13.7 mg/g) was observed for SA at 298 K, pH = 7.0, adsorbent dose = 0.3 g and time = 70 min which was 1.4 times higher than that of SB. Adsorption data modelled into Freundlich isotherm and pseudo-second-order kinetics. Mass transfer coefficients decreased with increase in As(III) concentration. Film diffusion significantly dominated the adsorption of As(III) ions irrespective of the initial concentration. Dimensionless Sherwood number (Sh) interrelated As(III) concentration (Co) as: Sh = 2.97(Co)–0.376, Sh = 4.12(Co)–0.215, Sh = 4.83(Co)–0.588 for H2SO4 modified, NaOH modified and native slag respectively. Low temperature (298 K) favoured As(III) adsorption (based on ΔG° value). Therefore, the modified slag can be used as an effective adsorbent for As(III) remediation from groundwater.

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Adsorptive removal studies of lead(II) ions using functionalized silica

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2011.020 ◽

2011 ◽

Vol 1 (2) ◽

pp. 113-121

Author(s):

Rajesh Kumar ◽

Thomas N. Abraham ◽

S. K. Jain

Keyword(s):

Freundlich Isotherm ◽

Cost Effective ◽

Contaminated Water ◽

Maximum Adsorption Capacity ◽

Functionalized Silica ◽

Second Order Reaction ◽

Infra Red ◽

Adsorption Data ◽

Pseudo Second Order ◽

Removal Studies

An adsorbent was prepared by the functionalization of 2-hydroxyacetophenone-3-thiosemicarbazone onto 3-aminopropyl silica by diazotation and characterized by Fourier transmission infra red spectrometry. The functionalized silica was evaluated for removal of lead(II) ions in aqueous solutions. The maximum adsorption capacity 385 μg/g was obtained with an initial concentration of 1,000 μg/L by the Langmuir isotherm. The results indicated that adsorption data could be fitted better by the Langmuir than the Freundlich isotherm. The adsorption kinetics followed pseudo-second-order reaction and the rate constants of kinetic model were calculated. The experimental results implied that functionalized silica has the potential to work as a good adsorbent for the removal of the heavy metals from contaminated water. This novel adsorbent was found to be easy to synthesize, simple, cost-effective and highly efficient and has potential application in the water purification field.

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Removal of Fluoride from Drinking Water Using Protonated Glycerol Diglycidyl Ether Cross-Linked Chitosan Beads

Chemistry & Chemical Technology ◽

10.23939/chcht15.02.205 ◽

2021 ◽

Vol 15 (2) ◽

pp. 205-216

Author(s):

P.N.S. Pathirannehe ◽

◽

T.D. Fernando ◽

C.S.K. Rajapakse ◽

◽

...

Keyword(s):

Contact Time ◽

Freundlich Isotherm ◽

Diglycidyl Ether ◽

Ion Concentration ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Chitosan Beads ◽

Modified Chitosan ◽

Chemically Modified ◽

Adsorption Data

In this study, physically and chemically modified chitosan; protonated glycerol diglycidyl ether cross-linked chitosan beads (GDCLCB/H+) were prepared and characterized using FTIR and SEM. The optimum defluoridation capacity (DC) of GDCLCB/H+ was observed at the initial F- ion concentration of 15 mg/l, adsorbent dosage of 0.6 g, contact time of 30 min and pH of the solution was in the range of 5–7 at 303 ± 2 K. The equilibrium adsorption data fitted well with Langmuir and Freundlich isotherm models. The maximum adsorption capacity (q0), obtained from Langmuir isotherm for F-adsorption was found to be 2000 mg/kg, which was significantly higher than that of unmodified chitosan (192.3 mg/kg) and most of the chitosan-based sorbents reported in the literature. Water samples collected from Medawachchiya, Sri Lanka, were treated with the adsorbents and the results suggested that GDCLCB/H+ could be used as an effective defluoridation agent.

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Comparative Biosorption Studies of Hexavalent Chromium Ion onto Raw and Modified Palm Branches

Advances in Physical Chemistry ◽

10.1155/2013/159712 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 18

Author(s):

Mona A. Shouman ◽

Nady A. Fathy ◽

Soheir A. Khedr ◽

Amina A. Attia

Keyword(s):

Adsorption Process ◽

Isotherm Models ◽

Ammonium Bromide ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Chemically Modified ◽

Chromium Vi ◽

Adsorption Data ◽

Order Kinetic Model ◽

Pseudo Second Order

The waste of palm branches (PB) was tested for its ability to remove chromium (VI) from aqueous solution by batch and column experiments. Palm branches chemically modified with an oxidizing agent (sulphuric acid) then coated with chitosan and surfactant (hexadecyl trimethyl ammonium bromide surfactant, HDTMA), respectively, were carried out to improve the removal performance of PB. The results of their Cr (VI) removal performances are pH dependent. The adsorption data could be well interpreted by the Langmuir, Freundlich, and Flory-Huggins isotherm models. The maximum adsorption capacity obtained from the Langmuir model for the chitosan coated oxidized palm branches is 55 mg/mg. The adsorption process could be described by pseudo-second-order kinetic model. The intraparticle diffusion study revealed that film diffusion might be involved. The biosorbents were successfully regenerated using 1 M HCL solution.

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Biosorption of Eosin by Chemically Modified Peanut Husk

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.233-235.439 ◽

2011 ◽

Vol 233-235 ◽

pp. 439-443

Author(s):

Ying Hua Song ◽

Sheng Ming Chen

Keyword(s):

Freundlich Isotherm ◽

Sorption Process ◽

Intraparticle Diffusion ◽

Transfer Model ◽

Experimental Conditions ◽

Isotherm Equation ◽

Chemically Modified ◽

Pseudo Second Order ◽

Uptake Studies ◽

Rate Controlling Step

The sorption of eosin by peanut husk, which was chemically modified by formaldehyde in acidic medium was studied with variation in the parameters of contact time, pH, initial eosin concentration and temperature. They were used for equilibrium sorption uptake studies with eosin. The results indicate that sorption equilibrium could be well described by the Freundlich isotherm equation. The sorption followed the pseudo-second order model. The mass transfer model as intraparticle diffusion was applied to the experimental data to examine the mechanisms of the rate controlling step. It was found that the intraparticle diffusion is becoming the significant controlling step under the experimental conditions. The thermodynamic constants of the sorption process were also evaluated, which suggest an endothermic physical sorption process which runs spontaneously.

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Kinetics of lead ion biosorption from aqueous solution onto lyophilized Aspergillus niveus

Water Practice & Technology ◽

10.2166/wpt.2010.020 ◽

2010 ◽

Vol 5 (1) ◽

Cited By ~ 6

Author(s):

Hülya Karaca ◽

Turgay Tay ◽

Merih Kıvanç

Keyword(s):

Adsorption Capacity ◽

Correlation Coefficients ◽

Freundlich Isotherm ◽

Second Order ◽

Lead Ions ◽

Lead Ion ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Aspergillus Niveus ◽

Pseudo Second Order

The biosorption of lead ions (Pb2+) onto lyophilized fungus Aspergillus niveus was investigated in aqueous solutions in a batch system with respect to pH, contact time and initial concentration of the ions at 30 °C. The maximum adsorption capacity of lyophilized A. niveus was found to be 92.6 mg g−1 at pH 5.1 and the biosorption equilibrium was established about in 30 min. The adsorption capacity obtained is one of the highest value among those reported in the literature. The kinetic data were analyzed using the pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion equations. Kinetic parameters, such as rate constants, equilibrium adsorption capacities, and related correlation coefficients for the kinetic models were calculated and discussed. It was found that the adsorption of lead ions onto lyophilized A. niveus biomass fit the pseudo-second-order kinetic model well. The Langmuir and Freundlich isotherm parameters for the lead ion adsorption were applied and the Langmuir model agreed better with the adsorption of lead ions onto lyophilized A. niveus.

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Sythesis of Nano Zerovalent Iron Supported Sawdust (NZVI/SD) and Its Application for Removal of Arsenic (III) from Aqueous Solution

Chemical Science International Journal ◽

10.9734/csji/2020/v29i130152 ◽

2020 ◽

pp. 1-12

Author(s):

Tasrina R. Choudhury ◽

Snahasish Bhowmik ◽

M. S. Rahman ◽

Mithun R. Nath ◽

F. N. Jahan ◽

...

Keyword(s):

Ph Value ◽

Ferrous Sulphate ◽

Freundlich Isotherm ◽

Second Order ◽

Zerovalent Iron ◽

Isotherm Model ◽

Order Kinetic ◽

Adsorption Sites ◽

Adsorption Data ◽

Pseudo Second Order

Sawdust supported nano-zerovalent (NZVI/SD) iron was synthesized by treating sawdust with ferrous sulphate followed by reduction with NaBH4. The NZVI/SD was characterized by SEM, XRD, FTIR and Chemical method. Adsorption of As (III) by NZVI/SD was investigated and the maximum uptake of As (III) was found at pH value of 7.74 and equilibrium time of 3 hrs. The adsorption isotherm modelling revealed that the equilibrium adsorption data were better fitted with the Langmuir isotherm model compared with the Freundlich Isotherm model. This study revealed that the maximum As (III) ions adsorption capacity was found to be 12.66 mg/g for using NZVI/SD adsorbent. However, the kinetics data were tested by pseudo-first-order and pseudo-second-order kinetic models; and it was observed that the adsorption data could be well fitted with pseudo-second-order kinetics for As (III) adsorption onto NZVI/SD depending on both adsorbate concentration and adsorption sites. The result of this study suggested that NZVI/SD could be developed as a prominent environment-friendly adsorbent for the removal of As (III) ions from aqueous systems.

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Karekterisasi, Kinetika, dan Isoterm Adsorpsi Limbah Ampas Kelapa sebagai Adsorben Ion Cu(II)

SAINTIFIK ◽

10.31605/saintifik.v6i2.265 ◽

2020 ◽

Vol 6 (2) ◽

pp. 104-115

Author(s):

Agusriyadin Agusriyadin

Keyword(s):

Adsorption Capacity ◽

Ph Effect ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Optimum Conditions ◽

Langmuir Adsorption ◽

Adsorbent Surface ◽

Adsorption Data ◽

Order Kinetic Model ◽

Pseudo Second Order

Penelitian ini bertujuan untuk menguji kemampuan AK dan AKPM dalam mengadsorpsi ion Cu (II), pengaruh parameter adsorpsi dan mekanisme adsorpsi. AK dan AKP Madsorben dibuat dari residu ampas kelapa. Adsorben dikarakterisasi dengan FTIR, SEM dan EDS. Pengaruh parameter adsorpsi seperti pH awal, dosis adsorben, waktu kontak dan konsentrasi ion Cu (II) awal diperiksa untuk menentukan kondisi optimum serapan tembaga (II). Ion Cu (II) yang teradsorpsi diukur berdasarkan pada konsentrasi Ion Cu (II) sebelum dan sesudah adsorpsi menggunakan metode AAS. Hasil karakterisasi menunjukkan bahwa struktur pori dan gugus fungsi tersedia pada permukaan adsorben. Menurut percobaan efek pH, kapasitas adsorpsi maksimum dicapai pada pH 7. Waktu kontak optimal dan konsentrasi tembaga awal (II) ditemukan masing-masing pada 120 menit dan 100 mg L-1. Data eksperimental sesuai dengan model kinetik orde dua orde dua, dan Langmuir isoterm adsorpsi yang diperoleh paling sesuai dengan data adsorpsi. Kapasitas adsorpsi maksimum adsorben ditemukan menjadi 4,73 dan 6,46 mg g-1 pada kondisi optimal. The results of characterization showed that the pore structure and the functional groups were available on adsorbent surface. According to the pH effect experiments, the maximum adsorption capacity was achieved at pH 7. Optimum contact time and initial copper(II) concentration were found at 120 min and 100 mg L-1, respectively. The experimental data were comply with the pseudo-second-order kinetic model, and Langmuir adsorption isotherm obtained best fitted the adsorption data. The maximum adsorption capacity of the adsorbents was found to be 4.73 and 6.46 mg g-1 at optimum conditions.

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Nanosized centers for mercury(II) ions adsorption on a surface of modified silica

Open Chemistry ◽

10.2478/s11532-008-0068-6 ◽

2008 ◽

Vol 6 (4) ◽

pp. 581-591 ◽

Cited By ~ 3

Author(s):

Lyudmila Belyakova ◽

Oleksandra Shvets ◽

Diana Lyashenko

Keyword(s):

Aqueous Medium ◽

Batch Adsorption ◽

Modified Silica ◽

First Order ◽

Chemically Modified ◽

First Order Kinetics ◽

Adsorption Data ◽

Pseudo Second Order ◽

Kinetics Of ◽

Second Order Equations

AbstractThe present work investigates the adsorptive interactions of Hg(II) ions in aqueous medium with hydroxylated silica, aminopropylsilica and silica chemically modified by β-cyclodextrin. Batch adsorption studies were carried out with various agitation times and mercury(II) concentrations. The maximum adsorption was observed within 15–30 min of agitation. The kinetics of the interactions, tested with the model of Lagergren for pseudo-first and pseudo-second order equations, showed better agreement with first order kinetics (k1 = 3.4 ± 0.2 to 5.9 ± 0.3 min−1). The adsorption data gave good fits with Langmuir isotherms. The results have shown that β-cyclodextrin-containing adsorbent has the largest adsorption specificity to Hg(II): K L = 4125 ± 205 mmol−1. “β-cyclodextrin-NO3-” inclusion complexes with ratio 1: 1 and super molecules with composition C42H70O35 ⊎ 3 Hg(NO3)2 are formed on the surface of β-cyclodextrin-containing silica.

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The Presence of Cu Facilitates Adsorption of Tetracycline (TC) onto Water Hyacinth Roots

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph15091982 ◽

2018 ◽

Vol 15 (9) ◽

pp. 1982 ◽

Cited By ~ 1

Author(s):

Xin Lu ◽

Beibei Tang ◽

Qi Zhang ◽

Lizhu Liu ◽

Ruqin Fan ◽

...

Keyword(s):

Water Hyacinth ◽

Freundlich Isotherm ◽

Root Surface ◽

Interactive Effects ◽

Order Kinetic ◽

Batch Experiments ◽

Adsorption Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Ph Range

Batch experiments were conducted to investigate the adsorption characteristics of tetracycline (TC), and the interactive effects of copper (Cu) on the adsorption of TC onto water hyacinth roots. TC removal efficiency by water hyacinth roots was ranging from 58.9% to 84.6%, for virgin TC, 1:1 TC-Cu and 1:2 TC-Cu. The Freundlich isotherm model and the pseudo-second-order kinetic model fitted the adsorption data well. Thermodynamics parameters ΔG0 for TC were more negative in the TC plus Cu than the TC-only treatments, indicating the spontaneity of TC adsorption increased with increasing of Cu concentrations. An elevated temperature was associated with increasing adsorption of TC by water hyacinth roots. The additions of Cu(II) significantly increased TC adsorption onto water hyacinth roots within the pH range 4 to 6, because copper formed a strong metal bridge between root surface and TC molecule, facilitating the adsorption of TC by roots. However, Cu(II) hindered TC adsorption onto water hyacinth roots on the whole at pH range from 6–10, since the stronger electrostatic repulsion and formation of CuOH+ and Cu(OH)2. Therefore, the interaction between Cu(II) and TC under different environmental conditions should be taken into account to understand the environmental behavior, fate, and ecotoxicity of TC.

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Removal of acetaminophen (ACT) from aqueous solution by using nanosilica adsorbent: experimental study, kinetic and isotherm modeling

Pigment & Resin Technology ◽

10.1108/prt-06-2019-0057 ◽

2020 ◽

Vol 49 (1) ◽

pp. 55-62

Author(s):

Akbar Eslami ◽

Zahra Goodarzvand Chegini ◽

Maryam Khashij ◽

Mohammad Mehralian ◽

Marjan Hashemi

Keyword(s):

Removal Rate ◽

Synthesis Method ◽

Freundlich Isotherm ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Content Type ◽

Bet Analysis ◽

Pseudo Second Order

Purpose A nanosilica adsorbent was prepared and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and BET. Design/methodology/approach The optimum conditions for the highest adsorption performance were determined by kinetic modeling. The adsorbent was used for the adsorption of acetaminophen (ACT), and the parameters affecting the adsorption were discussed like pH, initial concentration, contact time and adsorbent dosage. The adsorbent have been characterized by SEM, XRD and BET analysis. The kinetic models including pseudo-first-order and pseudo-second-order with Langmuir and Freundlich isotherm models were applied to investigate the kinetic and isotherms parameters. Findings The adsorption of ACT increased to around 95% with the increase of nanosilica concentration to 30 g/L. Moreover, the adsorption process of ACT follows the pseudo-second-order kinetics and the Langmuir isotherm with the maximum adsorption capacity of 609 mg/g. Practical implications This study provided a simple and effective way to prepare of nanoadsorbents. This way was conductive to protect environmental and subsequent application for removal of emerging pollutants from aqueous solutions. Originality/value The novelty of the study is synthesizing the morphological and structural properties of nanosilica-based adsorbent (specific surface area, pore volume and size, shape and capability) and improving its removal rate through optimizing the synthesis method; and studying the capability of synthesis of nanosilica-based adsorbent for removal of ACT as a main emerging pharmaceutical water contaminant.

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