scholarly journals Application of Waste Egg Shell for Adsorption of Cd(II) and Pb(II) Ions to Protect Environment: Equilibrium, Kinetic and Adsorption Studies

2021 ◽  
Vol 37 (1) ◽  
pp. 128-135
Author(s):  
Vijay Laxman Gurav ◽  
Rajesh Ashok Samant
Keyword(s):  
Adsorption Isotherm ◽  
Contact Time ◽  
Bet Surface Area ◽  
Aqueous Sample ◽  
Adsorption Parameters ◽  
Pseudo Second Order ◽  
Scherrer Formula ◽  
Egg Shell ◽  
Cadmium And Lead ◽  
The Impact

In the present work, we studied the impact of adsorption parameters on adsorption of M (II) [Cadmium and Lead] using calcinated chicken egg shell as biomaterial. The characterization of biomaterial reveals; crystallite size by Scherrer formula is 66.58 nm and 9.80 m2/g BET surface area. The adsorption of cadmium and lead on calcinated egg shell was found to be dependent on equilibrium adsorption parameters. The adsorption kinetic models and adsorption isotherm were successfully applied. The removal method was validated with anodic stripping voltametric technique. For standard aqueous sample of M (II), maximum removals were obtained at pH 5 and 200 mg of adsorbent and 120 minutes of contact time. The kinetic model followed pseudo second order kinetics at equilibrium contact time of 120 minute. The amounts of M (II) adsorbed per unit mass of calcinated egg shell increases with initial concentration up to 50 mg/L followed by deviation in results were observed. The Freundlich’s adsorption isotherm model is better fitted for M (II) adsorption with R2 closed to unity i.e0.9998 for Cadmium and 0.9983 for Lead. For real samples, adsorbed M (II) also recovered with 98 + 0.5 % recovery using 10 ml of 1.0 M HCl with flow rate of 2 ml per minute.

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.

scholarly journals Polyaspartate-Ionene/Na+-Montmorillonite Nanocomposites as Novel Adsorbent for Anionic Dye; Effect of Ionene Structure

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2843
Author(s):  
Hany El-Hamshary ◽  
Abeer S. Elsherbiny ◽  
Mohamed H. El-Newehy ◽  
Mohamed E. EL-Hefnawy
Keyword(s):  
Adsorption Isotherm ◽  
Antimicrobial Agents ◽  
Organic Pollutant ◽  
Bet Surface Area ◽  
Sodium Montmorillonite ◽  
Freundlich Model ◽  
Intraparticle Diffusion Model ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Acid Blue

Surface modification of sodium montmorillonite (Na+-Mt) was performed using antimicrobial agents to produce an ecofriendly nanocomposite. The adsorption performance of the nanocomposite has been evaluated for the removal of Acid Blue 25 dye (AB25) as a model organic pollutant from wastewater. Sodium montmorillonite (Na+-Mt) was modified with three different ionene compounds through ion exchange, and further modified through reaction with polyaspartate to provide three ecofriendly nanocomposites (denoted ICP-1–3). The nanocomposites were characterized using FTIR, PXRD, TEM, SEM, and BET surface area. The adsorption isotherm of AB25 onto ICP-1, ICP-2 and ICP-3 was analyzed using the Langmuir, Freundlich, and Dubinin–Radushkevich (D–R) models. The adsorption isotherm was found to be best fitted by a Freundlich model. The thermodynamic parameters were calculated. The kinetics of the adsorption data were analyzed and the adsorption behavior was found to obey pseudo-second-order kinetics, and the intraparticle diffusion model. The adsorption mechanism was studied by FTIR.

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).

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 Cadmium and Lead Adsorption Capacities of Nigerian Ultisol Soil of Tropics

2019 ◽  
Vol 35 (3) ◽  
pp. 1004-1012 ◽  
Author(s):  
Henry Olumayowa Oluwasola ◽  
Jonnie Niyi Asegbeloyin ◽  
Alfred Ezinna Ochonogor ◽  
Julius Udeh Ani ◽  
Collins Ugochukwu Ibeji ◽  
...  
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Sorption Process ◽  
Maximum Adsorption Capacity ◽  
Lead Adsorption ◽  
Adsorption Capacities ◽  
Batch Technique ◽  
Pseudo Second Order ◽  
Cadmium And Lead ◽  
Kinetics Of

The study investigates the sorption of cadmium (Cd) and lead (Pb) by Nsukka urban soils, a Nigeria soil classified as an ultisol soil of tropics. Laboratory batch technique was utilized to investigate the effect of pH, temperature, contact time, and concentration on the adsorption process. Results showed that adsorption efficiency of the soils for Cd2+ and Pb2+ increased with increase in pH, temperature, and contact time but decreased with increase in concentration. The data from adsorption study was fitted to the Langmuir, Freundlich and Temkin adsorption isotherms, and results revealed that Langmuir isotherm fitted most satisfactorily. On the basis of the obtained maximum adsorption capacity (qmax) from the Langmuir model, the affinity of Cd and Pb for the studied soil was Pb2+ > Cd2+. Pseudo-second order (r2 ≥ 0.995-0.999) best described the kinetics of the sorption process for the metal ions in the soil.

scholarly journals The adsorption and Fenton behavior of iron rich Terra Rosa soil for removal of aqueous anthraquinone dye solutions: kinetic and thermodynamic studies

2017 ◽  
Vol 76 (11) ◽  
pp. 3114-3125 ◽  
Author(s):  
Doga Aktas ◽  
Nadir Dizge ◽  
H. Cengiz Yatmaz ◽  
Yasemin Caliskan ◽  
Yasin Ozay ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Oxidation Process ◽  
Second Order ◽  
Order Kinetic ◽  
Anthraquinone Dye ◽  
Thermodynamic Studies ◽  
Soil Loading ◽  
Pseudo Second Order ◽  
The Impact

Abstract Adsorption and advanced oxidation processes are being extensively used for treatment of wastewater containing dye chemicals. In this study, the adsorption and Fenton behavior of iron rich Terra Rosa soil was investigated for the treatment of aqueous anthraquinone dye (Reactive Blue 19 (RB19)) solutions. The impact of pH, initial dye concentration, soil loading rate, contact time and temperature was systematically investigated for adsorption process. A maximum removal efficiency of dye (86.6%) was obtained at pH 2, soil loading of 10 g/L, initial dye concentration of 25 mg/L, and contact time of 120 min. Pseudo-first-order, pseudo-second-order, Elovich, and Weber–Morris kinetic models were applied to describe the adsorption mechanism and sorption kinetic followed a pseudo-second-order kinetic model. Moreover, Langmuir, Freundlich and Temkin isotherm models were used to investigate the isothermal mechanism and equilibrium data were well represented by the Langmuir equation. The maximum adsorption capacity of soil was found as 4.11 mg/g using Langmuir adsorption isotherm. The effect of soil loading and hydrogen peroxide (H2O2) dosage was solely tested for Fenton oxidation process. The highest removal efficiency of dye (89.4%) was obtained at pH 2, H2O2 dosage of 10 mM, soil loading of 5 g/L, initial dye concentration of 50 mg/L, and contact time of 60 min. Thermodynamic studies showed that when the adsorption dosage of dye was 25 mg/L at 293–313 K, adsorption enthalpy (ΔH) and entropy (ΔS) were negative and adsorption free energy (ΔG) was positive. This result indicated that the adsorption was exothermic. Morphological characteristics of the soil were evaluated by X-ray fluorescence (XRF), scanning electron microscopy (SEM), and attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy before and after the adsorption and oxidation process.

scholarly journals Equilibrium, kinetics, and thermodynamics studies of polypyrrole adsorbent for arsenic ions

2017 ◽  
Vol 18 (1) ◽  
pp. 240-250
Author(s):  
A. K. Obidul Huq ◽  
Rosiyah Yahya ◽  
Habibun Nabi Muhammad Ekramul Mahmud
Keyword(s):  
Contact Time ◽  
Oxidative Polymerization ◽  
Aqueous Media ◽  
Average Particle Size ◽  
Bet Surface Area ◽  
Solution Temperature ◽  
Average Particle ◽  
Equilibrium System ◽  
Adsorption Parameters ◽  
Removal Of Arsenic

Abstract Polypyrrole (PPy)-based adsorbents have successfully been prepared via oxidative polymerization in aqueous media as a new adsorbent for the removal of arsenic ions in a batch equilibrium system. The prepared adsorbent was characterized by the Brunauer–Emmet–Teller (BET) surface analyzer, field emission scanning electron microscopy (FESEM), and attenuated total reflectance–Fourier transform infrared spectroscopy (ATR-FTIR). The BET surface area and average particle size of the prepared PPy powder was 10.27 m2/g and ∼180–295 nm, respectively. Different adsorption parameters, such as adsorbent dosage, contact time, pH of the initial solution, temperature, initial ions and co-ions concentrations were investigated. The results showed that PPy powder acted as an effective sorbent for the removal of arsenic ions at the optimum conditions of pH 6.5 and a contact time of 6 h. The experimental data of PPy isotherms for arsenic ions followed the Freundlich isotherm model and kinetics data were well fitted to the pseudo-first-order model. Thermodynamically, the adsorption process was endothermic and spontaneous in nature. The FTIR and FESEM-EDX results also confirmed the presence of arsenic in adsorbents after adsorption. The presence of amine groups in PPy is believed to play the key role of adsorption of arsenic ions.

scholarly journals Removal of Malachite Green from Single and Multi-Dye Aqueous Solutions by Acid-Treated Sawdust

2019 ◽  
Vol 35 (4) ◽  
pp. 1384-1391
Author(s):  
Abdur-Rahim Adebisi ◽  
Giwa Khadijat Ayanpeju ◽  
Abdulsalam Francois Wewers ◽  
Mary Adelaide Oladipo
Keyword(s):  
Adsorption Isotherm ◽  
Aqueous Solutions ◽  
Malachite Green ◽  
Removal Efficiency ◽  
Contact Time ◽  
Adsorption Process ◽  
Parkia Biglobosa ◽  
Order Model ◽  
Experimental Conditions ◽  
Pseudo Second Order

The study investigates the effectiveness and mechanism of the adsorption of malachite green from single and mixed dyes aqueous solutions by an adsorbent prepared from acid-treated Parkia biglobosa sawdust. The adsorbent was characterized using different techniques, and the adsorption was conducted in single, binary, ternary and quaternary dye systems under different experimental conditions. Experimental results were subjected to different isotherm and kinetics models. The adsorption process was endothermic and thermodynamically feasible with the removal efficiency increasing with increase in adsorbent dosage, solution working pH, initial dye concentration and contact time. The rate of sorption of the dye was fast; it attained equilibrium within 180 minutes in both the single and mixed solute systems. Pseudo-second order model gives the best kinetics fit (R2 = 0.998). The adsorption isotherm in all solute systems have best fits for the Temkin model (R2 > 0.96).

scholarly journals Removal of Pb(II) using Hydroxyapatite from Golden Snail Shell (Pomacea canaliculata L.) Modified with Silica

Molekul ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 130
Author(s):  
Poedji Loekitowati Hariani ◽  
Fahma Riyanti ◽  
Fatma Fatma ◽  
Addy Rachmat ◽  
Aldi Herbanu
Keyword(s):  
Contact Time ◽  
Second Order ◽  
Pomacea Canaliculata ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
First Order ◽  
Optimum Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The composites of hydroxyapatite and SiO2 were successfully synthesized. The hydroxyapatite was prepared from golden snail shells (Pomacea canaliculata L). The hydroxyapatite and hydroxyapatite-SiO2 composites were characterized using XRD, FTIR, SEM-EDS. Furthermore, hydroxyapatite and hydroxyapatite-SiO2 composites were used to remove Pb(II) from aqueous solution. Various adsorption parameters such as pH of the solution, contact time, and initial Pb(II) concentration were used to study the adsorption process. The optimum pH of the solution for removal of Pb(II) by hydroxyapatite and hydroxyapatite-SiO2 composite at pH 6 and contact time at 60 minutes. Both adsorbents follow the Langmuir isotherm. The maximum adsorption capacity of the hydroxyapatite-SiO2 composite is greater compare to hydroxyapatite, respectively 135.14 and 123.46 mg/g. The pseudo-second order kinetic model had a correlation coefficient (R2) greater than the pseudo-first order so pseudo-second order kinetic is better to describe adsorption kinetics

scholarly journals Decontamination of cadmium(II) from synthetic wastewater onto shea fruit shell biomass

2021 ◽  
Vol 11 (5) ◽  
Author(s):  
Jonas Bayuo
Keyword(s):  
Negative Charge ◽  
Agricultural Waste ◽  
Freundlich Isotherm ◽  
Synthetic Wastewater ◽  
Batch Method ◽  
Adsorption Parameters ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
The Impact ◽  
Best Fit

AbstractShea fruit shells being an agricultural waste material was utilized to test its novelty as an inexpensive biosorbent for the elimination of Cd(II) from synthetic wastewater using the batch method. A batch study was employed to probe the impact of pH of the solution, contact time, temperature and initial concentration on the depollution of Cd(II) ions using unmodified Shea fruit shells biomass. The decontamination of Cd(II) by the unmodified Shea fruit shells biomass was found to be dependent on these adsorption parameters. The equilibrium data best represented Freundlich isotherm by a correlation coefficient (R2) of 0.9691. The kinetic models analyzed suggest pseudo-second-order ($${R}^{2} = 0.9515$$ R 2 = 0.9515 ) as the best fit model signifying that the removal of Cd(II) ions was on account of chemisorption. The positive values of the thermodynamic parameters, ΔH° and ΔS° reveal endothermic and increase of disorder of the process while the negative charge of ΔG° shows spontaneity of the system.

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