scholarly journals Preparation of CoFe2O4/activated carbon@chitosan as a new magnetic nanobiocomposite for adsorption of ciprofloxacin in aqueous solutions

2018 ◽  
Vol 78 (10) ◽  
pp. 2158-2170 ◽  
Author(s):  
Mohammad Malakootian ◽  
Alireza Nasiri ◽  
Hakimeh Mahdizadeh
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Adsorbent Dosage ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Isotherm Equations

Abstract Ciprofloxacin (CIP) is considered as a biological resistant pollutant. The CoFe2O4/activated carbon@chitosan (CoFe2O4/AC@Ch) prepared as a new magnetic nanobiocomposite and used for adsorption of CIP. CoFe2O4/AC@Ch was characterized by Fourier transform-infrared (FT-IR), field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), vibrating-sample magnetometer (VSM), and Brunauer–Emmett–Teller (BET) surface area measurements. The pHZPC value of the nanobiocomposite was estimated to be 6.4 by solid addition method. The prepared magnetic nanobiocomposites can be separated easily from water by an external magnet and reused. The effect of CIP concentration (10–30 mg/L), adsorbent dosage (12–100 mg/L), contact time (5–30 min) and pH (3–11) as independent variables on ciprofloxacin removal efficiency was evaluated. Optimum conditions were obtained in CIP concentration: 10 mg/L, adsorbent dosage: 100 mg/L, contact time: 15 min and pH: 5. In this condition, maximum CIP removal was obtained as 93.5%. The kinetic and isotherm equations showed that the process of adsorption followed the pseudo-second order kinetic and Langmuir isotherm. The results indicate that the prepared magnetic nanobiocomposite can be used as good adsorbent for the removal of CIP from aqueous solution and can be also recycled.

Nano-ZrO2/TiO2 Impregnated Orange Wood Sawdust and Peach Stone Shell Adsorbents for Cr (VI) Removal

2020 ◽  
Vol 16 (7) ◽  
pp. 880-892
Author(s):  
Şerife Parlayıcı ◽  
Kübra Tuna Sezer ◽  
Erol Pehlivan
Keyword(s):  
Contact Time ◽  
Ph Value ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Wood Sawdust ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Equilibrium Status

Background: In this work, Cr (VI) adsorption on nano-ZrO2๏TiO2 impregnated orange wood sawdust (Zr๏Ti/OWS) and nano-ZrO2๏TiO2 impregnated peach stone shell (Zr๏Ti/PSS) was investigated by applying different adsorption parameters such as Cr (VI) concentrations, contact time, adsorbent dose, and pH for all adsorbents. Methods: The adsorbents were characterized by SEM and FT-IR. The equilibrium status was achieved after 120 min of contact time and optimum pH value around 2 were determined for Cr (VI) adsorption. Adsorption data in the equilibrium is well-assembled by the Langmuir model during the adsorption process. Results: Langmuir isotherm model showed a maximum adsorption value of OWS: 21.65 mg/g and Zr๏Ti/OWS: 27.25 mg/g. The same isotherm displayed a maximum adsorption value of PSS: 17.64 mg/g, and Zr๏Ti/PSS: 31.15 mg/g. Pseudo-second-order kinetic models (R2=0.99) were found to be the best models for describing the Cr (VI) adsorption reactions. Conclusıon: Thermodynamic parameters such as changes in ΔG°, ΔH°, and ΔS° have been estimated, and the process was found to be spontaneous.

Adsorption of Copper(II) on Dithizone-Immobilized Coal Fly Ash

2020 ◽  
Vol 840 ◽  
pp. 48-56
Author(s):  
Violla Bestari Ayu Sabrina Putri ◽  
Dwi Siswanta ◽  
Mudasir Mudasir
Keyword(s):  
Fly Ash ◽  
Contact Time ◽  
Copper Ions ◽  
Coal Fly Ash ◽  
Organic Ligand ◽  
Optimum Conditions ◽  
Batch Mode ◽  
Copper Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir

The adsorption of Cu (II) ions onto selective adsorbent of coal fly ash from Sugar Factory Madukismo, Yogyakarta, Indonesia modified with dithizone has been investigated in batch mode. Some parameters influencing immobilization of dithizone and adsorption of Cu (II) were optimized including an effect of pH, contact time and initial concentration of Cu (II) ions. The FT-IR and XRD analytical results show that the surface of coal fly ash can be modified by immobilization of selective organic ligand towards Cu (II) ions. The optimum conditions for adsorption of Cu (II) are achieved at pH 5, the optimum mass of DICFA and ACFA for copper adsorption were 0.2 g. Kinetics adsorption for copper ions follows pseudo-second-order kinetics with optimum adsorption contact time 60 min for DICFA and ACFA. Isotherms adsorption for Cu ion follow the Langmuir isotherms with chemisorption process and optimum concentration of Cu ion adsorption of 70 mg.L-1 for DICFA and ACFA.

Adsorption of Pb(II) from Aqueous Solutions on Dithizone-Immobilized Coal Fly Ash

2020 ◽  
Vol 840 ◽  
pp. 57-63
Author(s):  
Dina Fitriana ◽  
Mudasir Mudasir ◽  
Dwi Siswanta
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Contact Time ◽  
Coal Fly Ash ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Activated Coal ◽  
Concentration Of Ions ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Adsorption of Pb(II) ions onto selective adsorbent of dithizone-immobilized coal fly ash (DCFA) from Holcim, Cilacap, Indonesia has been investigated in batch experiments. Prepared coal fly ash (CFA) modified by immobilization of dithizone previously were characterized by FT-IR and XRD. Several parameters influencing the adsorption of Pb(II) ions such as effect of pH, adsorbent dosage, contact time and initial concentration of ions on the efficiency of the adsorption were studied. The optimum condition of Pb(II) adsorption was found at pH 5, adsorbent dosage 0.1 g, contact time 60 min and initial Pb(II) ions concentration of 60 mg L–1. The adsorption kinetics of Pb(II) ions on DCFA was found to follow a pseudo-second-order kinetic model. The adsorption isotherm data were fitted to the Langmuir model. Kinetics and adsorption isotherm studies suggest that the capacity and affinity of the DCFA in adsorbing Pb(II) ions is significantly improved compared to those of non-immobilized activated coal fly ash (ACFA).

Characterization of natural- and organobentonite by XRD, SEM, FT-IR and thermal analysis techniques and its adsorption behaviour in aqueous solutions

Clay Minerals ◽  
2012 ◽  
Vol 47 (1) ◽  
pp. 31-44 ◽  
Author(s):  
G. A. Ikhtiyarova ◽  
A. S. Özcan ◽  
Ö. Gök ◽  
A. Özcan
Keyword(s):  
Surface Area ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Textile Dye ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Thermal Analysis Techniques

AbstractIn this study, natural bentonite was modified with hexadecyltrimethylammonium (HDTMA) bromide to obtain organobentonite (HDTMA-bentonite). Bentonite and HDTMA-bentonite were then characterized using XRD, XRF, SEM, FT-IR, thermogravimetric (TG) analysis, elemental analysis and Brunauer-Emmett-Teller (BET) surface area techniques. The HDTMA+ cation was found to be located on the surface and enters the interlayer spaces of smectite according to the XRD and SEM results. FT-IR spectra indicated the existence of HDTMA functional groups on the bentonite surface. The BET surface area significantly decreased after the modification due to the coverage of the pores of natural bentonite. After the characterization, the adsorption of a textile dye, Reactive Blue 19 (RB19), onto bentonite and HDTMA-bentonite was investigated. The maximum adsorption capacity of HDTMA-bentonite for RB19 was 502 mg g-1 at 20°C. The adsorption process followed a pseudo-second-order kinetic model and it was exothermic and physical in nature.

scholarly journals Removal of Cu(II) Ions byLeucaena Leucocephala(Subabul) Seed Pods from Aqueous Solutions

2010 ◽  
Vol 7 (s1) ◽  
pp. S377-S385 ◽  
Author(s):  
A. K. Patil ◽  
V. S. Shrivastava
Keyword(s):  
Leucaena Leucocephala ◽  
Contact Time ◽  
Unit Weight ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Isotherm Equations ◽  
Adsorbent Dose

In this method,Leucaena leucocephalaseed pods (LLSP) have been used for removal of Cu(II) ions from aqueous solution. Batch adsorption experiments were conducted to study the effect of process parameters like pH, contact time initial Cu(II) ions concentration and adsorbent dose. The maximum adsorption of Cu(II) ions onLeucaena leucocephalaseed pods was 94.17% at pH 5. The amount of metal adsorbed per unit weight of adsorbent increases with time and reach equilibrium after 30 minutes of shaking time for the different initial metal concentrations. The Freundlich and Langmuir isotherm equations were applied for the equilibrium adsorption data and the various isotherm parameters were evaluated. The obtained plots were linear as evident fromR2values close to unity. The data agreed very well with the pseudo second-order kinetic model.

scholarly journals Preparation of Activated Carbon from the Wood of Paulownia tomentosa as an Efficient Adsorbent for the Removal of Acid Red 4 and Methylene Blue Present in Wastewater

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1453
Author(s):  
Sultan Alam ◽  
Muhammad Sufaid Khan ◽  
Wahida Bibi ◽  
Ivar Zekker ◽  
Juris Burlakovs ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Second Order ◽  
Raw Material ◽  
Experimental Result ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Paulownia Tomentosa ◽  
Adsorbent Dosage ◽  
Pseudo Second Order

Paulownia tomentosa, a woody plant that is widely found in Pakistan and in other regions of the world, was used as a raw material to prepare activated carbon using chemical and physical activation methods. Adsorption of the dyes- acid red 4 and methylene blue onto the prepared activated carbon were analyzed by batch experiments. The impacts of different adsorption parameters such as pH, temperature, contact time, initial dye concentration and adsorbent dosage were also evaluated. Equilibrium data were fitted into various isotherm models such as: Langmuir, Temkin and Freundlich. High regression values were achieved with Langmuir isotherm model. Different kinetic adsorption models such as pseudo-first-order, pseudo-second-order and intra-particle diffusion model models were applied. The adsorption kinetics was found to be best-fitted into pseudo-second-order kinetic model. The optimum pH for acid red 4 was around 1 while for methylene blue it was 8. The optimum adsorbent dosage was 0.3 g for both dyes used. The activation energy (Ea) values were 30.57 and 3.712 kJ/mol, respectively for acid red 4 and methylene blue while the enthalpy (ΔH) and entropy (ΔS) values were correspondingly as 24.88/1.1927 kJ/mol and −2843.32/−0.329 J·mol/K for the mentioned dyes. The experimental result showed that the prepared activated carbon was the best in the removal of acid red 4 and methylene blue from aqueous media and therefore, could be preferably used as cheap adsorbent in wastewater treatment.

scholarly journals Selective Removal of Sodium Ions from Aqueous Media Using Effective Adsorbents: Optimization by RSM and Genetic Algorithm

2021 ◽  
Vol 68 (4) ◽  
pp. 791-803
Author(s):  
Lei Yao ◽  
Chao Hong ◽  
Hani Dashtifard ◽  
Hossein Esmaeili
Keyword(s):  
Genetic Algorithm ◽  
Activated Carbon ◽  
Sorption Capacity ◽  
Removal Efficiency ◽  
Contact Time ◽  
Aqueous Media ◽  
Ion Concentration ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Sorption Efficiency

This study aimed to determine the best adsorbent among Moringa oleifera-derived activated carbon (AC), eggshell-derived CaO nanoparticles and CaO/Fe3O4 for sodium (Na+) removal from aqueous media. In the first step, the appropriate adsorbent for sodium adsorption was determined among the three adsorbents, which the results showed that the AC had the highest sorption efficiency. Then, response surface methodology (RSM) was used to evaluate the impact of different factors on the Na+ ion sorption efficiency using the AC. The highest removal efficiency was obtained to be 95.91% at optimum conditions such as pH of 11, contact time of 45 min, temperature of 25 °C, sodium ion concentration of 900 mg/L, and adsorbent dosage of 5 g/L. Also, the best conditions using the genetic algorithm was obtained at contact time of 94.97 min, adsorbent dosage of 3.52 g/L, Na+ ion concentration of 939.92 mg/L and pH value of 10.92. Moreover, the maximum sorption capacity using the Langmuir model was obtained to be 249.67 mg/g, which was a significant value. Besides, the equilibrium and kinetic studies indicated that the experimental data of sodium adsorption process were fitted well with the Langmuir isotherm model and the pseudo-second-order kinetic model, respectively. Furthermore, the thermodynamic study indicated that the sorption process was endothermic. Generally, among the three adsorbents used, activated carbon with a high removal efficiency and significant sorption capacity can be considered as a promising adsorbent for the removal of sodium from wastewater on an industrial scale.

scholarly journals Removal of Ciprofloxacin from of Pharmaceutical Wastewater by Adsorption on SiO2 Nanoparticle

2019 ◽  
pp. 1-9
Author(s):  
Ferdos Kord Mostafapour ◽  
Davoud Balarak ◽  
Marzieh Baniasadi
Keyword(s):  
Experimental Data ◽  
Contact Time ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
Pharmaceutical Wastewater ◽  
Error Functions ◽  
Sio2 Nanoparticle ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Sorption Phenomenon

The removal of Ciprofloxacin (CFX) on SiO2 nanoparticle was performed as a function of initial CFX concentration, contact time at fixed pH and adsorbent dose and characterized using scanning electron microscopy (SEM) and Brunauer Emmett Teller (BET) surface area. Amount of CFX uptake increased with increasing contact time and decreased concentration of initial CFX. Adsorption behavior was well described by pseudo second-order kinetic model. It was observed that equilibrium dye uptake significantly increased from 49.01 to 174.58 mg/g when initial CFX concentration increased from 25 to 100 mg/L. Experimental data were well fitted to Langmuir, Freundlich and Temkin and Dubinin-Radushkevich (D–R) models. Three different error functions were conducted to find better model to describe the experimental data. The lower values of error functions exhibited that Langmuir model was more suitable for the adsorption of CFX, which implied a homogeneous sorption phenomenon.

scholarly journals Study Into Dynamic Behaviour of the Methylene Blue Adsorption on Activated Carbon

2021 ◽  
Vol 29 (48) ◽  
pp. 105-113
Author(s):  
Alica Pastierová ◽  
Maroš Sirotiak
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Contact Time ◽  
Dynamic Behaviour ◽  
Time Effect ◽  
Adsorption Kinetic ◽  
Optimum Conditions ◽  
Methylene Blue Adsorption ◽  
Initial Concentration ◽  
Pseudo Second Order

Abstract This paper presents a study into dynamic behaviour of the methylene blue adsorption (MB) on activated carbon. Effect of four parameters were studied: effect of the adsorbent dosage, effect of contact time, effect of pH, and effect of the initial concentration of methylene blue. The adsorption kinetic data were modelled using the pseudo-first and pseudo-second orders. Results show that, based on the experimental data, the pseudo-second order could be considered satisfactory. Thermodynamic parameters proved that adsorption of dye was spontaneous owing to increase in temperature and endothermic nature. Taguchi method was applied to determine the optimum conditions for removal of methylene blue by activated carbon. The optimum conditions were found to be pH = 7, contact time 60 min, initial concentration of MB 4 mg/L.

scholarly journals A novel activated carbon prepared from grapefruit peel and its application in removal of phenolic compounds

2018 ◽  
Vol 77 (10) ◽  
pp. 2517-2527 ◽  
Author(s):  
Xiao Liu ◽  
Yibei Wan ◽  
Penglei Liu ◽  
Yanzhen Fu ◽  
Weihua Zou
Keyword(s):  
Activated Carbon ◽  
Phenolic Compounds ◽  
Contact Time ◽  
Order Kinetic ◽  
Initial Concentration ◽  
Bet Analysis ◽  
Order Kinetic Model ◽  
Grapefruit Peel ◽  
Pseudo Second Order ◽  
Activating Agent

Abstract The most ideal conditions for preparing activated carbon from grapefruit peel (GPAC) were studied using NH4H2PO4 as a chemical activating agent and the obtained material was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Brunauer–Emmett–Teller (BET) analysis. The adsorption capacity of the resulting material has been checked using three phenolic compounds (pyrocatechol (CA), 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP)). The adsorption characteristics of phenolic compounds from aqueous solution by GPAC have been investigated as a function of contact time, pH, initial concentration and temperature. The equilibrium experimental data fitted well with Freundlich and Koble–Corrigan isotherms. The adsorption of the three phenolic compounds on GPAC fitted well with pseudo-second-order kinetic model. Different thermodynamic parameters were also evaluated and it was found that the adsorption was spontaneous, feasible and endothermic in nature. Adsorbents were regenerated by 0.1 mol/L NaOH and GPAC could be reused in phenolic compounds removal.

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