scholarly journals Adsorption Behavior of some N-alkyl Pyridinium Salts from Aqueous Solution on Amberlite-IR 120 H+ resin

2018 ◽  
Vol 34 (3) ◽  
pp. 1283-1296
Author(s):  
Najah Ayad Alshammari ◽  
Ehteram A. Noor ◽  
Jamilah Mohammad Alahmari
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Alkyl Chain ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Pyridinium Salts ◽  
Adsorption Efficiency ◽  
Adsorbate Concentration ◽  
Adsorption Processes ◽  
Temkin Adsorption Isotherm

The effect of Amberlite-IR 120 H+ resin to remove some organic compounds (N-alkyl pyridinium salts) from aqueous solutions at certain conditions was investigated. The effect of resin dosage, contact time, adsorbate concentration, ionic strength and solution temperature on the adsorption efficiency was examined. The experimental data collected generally proved that the adsorption efficiency decreased as the alkyl chain increased. The thermodynamic equilibrium parameters of the adsorption processes were evaluated and showed that the adsorption process is spontaneous, disordered and exothermic. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D.R) isotherm models were applied based on the batch method. Freundlich, Temkin and D. R gave bilinear segments model based on the adsorbate initial concentrations except that for compound III where it gave straight of one segment for Temkin adsorption isotherm. Overall, Amberlite-IR 120 H+ resin is effective in removing some N-alkyl pyridinium salts from an aqueous solution.

scholarly journals Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

2017 ◽  
Vol 13 (27) ◽  
pp. 425
Author(s):  
Azeh Yakubu ◽  
Gabriel Ademola Olatunji ◽  
Folahan Amoo Adekola
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

This investigation was conducted to evaluate the adsorption capacity of nanoparticles of cellulose origin. Nanoparticles were synthesized by acid hydrolysis of microcrystalline cellulose/cellulose acetate using 64% H3PO4 and characterized using FTIR, XRD, TGA-DTGA, BET and SEM analysis. Adsorption kinetics of Pb (II) ions in aqueous solution was investigated and the effect of initial concentration, pH, time, adsorbent dosage and solution temperature. The results showed that adsorption increased with increasing concentration with removal efficiencies of 60% and 92.99% for Azeh2 and Azeh10 respectively for initial lead concentration of 3 mg/g. The effects of contact time showed that adsorption maximum was attained within 24h of contact time. The maximum adsorption capacity and removal efficiency were achieved at pH6. Small dose of adsorbent had better performance. The kinetics of adsorption was best described by the pseudo-second-Order model while the adsorption mechanism was chemisorption and pore diffusion based on intra-particle diffusion model. The isotherm model was Freundlich. Though, all tested isotherm models relatively showed good correlation coefficients ranging from 0.969-1.000. The adsorption process was exothermic for Azeh-TDI, with a negative value of -12.812 X 103 KJ/mol. This indicates that the adsorption process for Pb by Azeh-TDI was spontaneous. Adsorption by Azeh2 was endothermic in nature.

scholarly journals Characterization and Evaluation of Zeolite A/Fe3O4 Nanocomposite as a Potential Adsorbent for Removal of Organic Molecules from Wastewater

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Emmanuel Nyankson ◽  
Jonas Adjasoo ◽  
Johnson Kwame Efavi ◽  
Reuben Amedalor ◽  
Abu Yaya ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Isotherm Models ◽  
Adsorption Efficiency ◽  
Ferrous Chloride ◽  
X Ray ◽  
Intraparticle Diffusion Model ◽  
Adsorption Processes ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Chloride Salts

In this work, zeolite (Z) and Z-Fe3O4 nanocomposite (Z-Fe3O4 NC) have been synthesized. The Fe3O4 nanoparticles were synthesized using the extract from maize leaves and ferric and ferrous chloride salts and encapsulated into the zeolite framework. The nanocomposite (Z-Fe3O4 NC) was characterized using X-ray diffractometer (XRD), Fourier-transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray (EDX) spectroscopy, and scanning electron microscopy (SEM). The potential of Z-Fe3O4 NC as an adsorbent for removing methylene blue molecules (MB) from solution was examined using UV-Vis and kinetic and equilibrium isotherm models. The adsorption data fitted best with the pseudo-second-order model and Weber and Morris model, indicating that the adsorption process was chemisorption, while the Weber and Morris described the rate-controlling steps. The intraparticle diffusion model suggests that the adsorption processes were pore and surface diffusion controlled. The Langmuir isotherm model best describes the adsorption process indicating homogeneous monolayer coverage of MB molecules onto the surface of the Z-Fe3O4 NC. The maximum Langmuir adsorption capacity was 2.57 mg/g at 25°C. The maximum adsorption efficiency was 97.5%. After regeneration, the maximum adsorption efficiency achieved at a pH of 7 was 82.6%.

scholarly journals Sorption of Bivalent Ions by Cymbopogon citratus: Characterisation and Investigation of Biosorptive Capacity and Mechanism

2018 ◽  
Vol 4 (3) ◽  
pp. 297-302
Author(s):  
S. Jayashree ◽  
Jeyavathana Samuel ◽  
R. Vashantha
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Adsorption Process ◽  
Low Cost ◽  
Kinetic Studies ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Physical Parameters ◽  
Cymbopogon Citratus ◽  
Equilibrium Data

The main objective of this study was to investigate the removal of cadmium(II) ions from aqueous solution using raw Cymbopogon citratus as an adsorbent. It was characterized by FT-IR, XRD, SEM-EDAX and its physical parameters were analyzed. Different factors such as pH, contact time, initial concentration and temperature were studied. Maximum adsorption was taken place at the optimum pH of 6 and the equilibrium data were analyzed by Langmuir, Freundlich and Temkin Isotherm models. Among those isotherm models Langmuir and Temkin were fitted well with good correlation coefficient (R2). The negative values of ΔG⁰ for all temperature shows the adsorption process for cadmium(II) ion was spontaneous in nature and feasible. The negative value of enthalpy change ΔH⁰ shows the adsorption process is exothermic and the positive value of ΔS⁰ indicates the disorderness or randomness process of adsorption. The positive value of Ea indicates the higher solution temperature favors the adsorption of metal ion onto RCC. The experimental data were analyzed by kinetic studies such as pseudo-first order, pseudo-second order and intra-particle diffusion models. Desorption was also studied and the recovery of the adsorbent was found to be 10%. Thus on the basis of these investigations the present study concludes that the raw Cymbopogon citratus (RCC) was found to be highly effective, nontoxic, environmental friendly and low cost adsorbent for the removal of toxic Cd(II) ions from aqueous solution.

scholarly journals Characterization of Residual Biomasses and Its Application for the Removal of Lead Ions from Aqueous Solution

2019 ◽  
Vol 9 (21) ◽  
pp. 4486 ◽  
Author(s):  
Candelaria Tejada-Tovar ◽  
Angel Darío Gonzalez-Delgado ◽  
Angel Villabona-Ortiz
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
High Surface ◽  
High Surface Area ◽  
Freundlich Isotherm ◽  
Mesoporous Structure ◽  
Isotherm Models ◽  
Solution Ph ◽  
Batch Mode ◽  
Suitable Alternative

The removal of water pollutants has been widely addressed for the conservation of the environment, and novel materials are being developed as adsorbent to address this issue. In this work, different residual biomasses were employed to prepare biosorbents applied to lead (Pb(II)) ion uptake. The choice of cassava peels (CP), banana peels (BP), yam peels (YP), and oil palm bagasse (OPB) was made due to the availability of such biomasses in the Department of Bolivar (Colombia), derived from agro-industrial activities. The materials were characterized by ultimate and proximate analysis, Fourier Transform Infrared Spectroscopy (FTIR), Brunauer-Emmett-Teller analysis (BET), Scanning Electron Microscopy (SEM), and Energy Dispersive X-Ray Spectroscopy (EDS) in order to determine the physicochemical properties of bioadsorbents. The adsorption tests were carried out in batch mode, keeping the initial metal concentration at 100 ppm, temperature at 30 °C, particle size at 1 mm, and solution pH at 6. The experimental results were adjusted to kinetic and isotherm models to determine the adsorption mechanism. The remaining concentration of Pb(II) in solution was measured by atomic absorption at 217 nm. The functional groups identified in FTIR spectra are characteristic of lignocellulosic materials. A high surface area was found for all biomaterials with the exception of yam peels. A low pore volume and size, related to the mesoporous structure of these materials, make these bioadsorbents a suitable alternative for liquid phase adsorption, since they facilitate the diffusion of Pb(II) ions onto the adsorbent structure. Both FTIR and EDS techniques confirmed ion precipitation onto adsorbent materials after the adsorption process. The adsorption tests reported efficiency values above 80% for YP, BP, and CP, indicating a good uptake of Pb(II) ions from aqueous solution. The results reported that Freundlich isotherm and pseudo-second order best fit experimental data, suggesting that the adsorption process is governed by chemical reactions and multilayer uptake. The future prospective of this work lies in the identification of alternatives to reuse Pb(II)-contaminated biomasses after heavy metal adsorption, such as material immobilization.

Investigation of Titania Addition into Tar Sands for Removal of Phenol from Aqueous Solutions

2006 ◽  
Vol 41 (1) ◽  
pp. 94-99 ◽  
Author(s):  
Lua'y Zeatoun ◽  
Munjed Al-Sharif ◽  
Abeer Al-Bsoul
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Sorption Process ◽  
The Other ◽  
Solution Temperature ◽  
Equilibrium Isotherm ◽  
Activation Temperature ◽  
Tar Sands ◽  
Initial Concentration ◽  
Initial Phenol Concentration

Abstract Tar sands were found to remove significant amounts of phenol from aqueous solution in the presence of titania; about 70% at an initial concentration of 10 ppm. Batch sorption experiments showed that phenol uptake was increased with either an increase in initial phenol concentration, percentage of titania in the sorbent or pre-activation temperature. On the other hand, the presence of soft ions such as sodium, Na+, or potassium, K+, or the increase of solution temperature suppressed the uptake of phenol. Physical pre-activation of the tar sands influenced the adsorption process positively. The sorption process appears to be exothermic and relatively fast; the equilibrium isotherm data were well represented by either Langmuir or Freundlich models.

scholarly journals Adsorption of Malachite Green by Jordanian Diatomite Ores: Equilibrium Study

2019 ◽  
Vol 2 (1) ◽  
pp. 92-99
Author(s):  
Emad El Qada
Keyword(s):  
Particle Size ◽  
Adsorption Process ◽  
Isotherm Models ◽  
Equilibrium Isotherm ◽  
Freundlich Model ◽  
Equilibrium Study ◽  
Liquid Phase Adsorption ◽  
Experimental Parameters ◽  
Optimum Ph ◽  
Adsorption Processes

The focal theme of this work is to assess the ability of Jordanian diatomite to treat MG-bearing effluents. Effects of several experimental parameters namely, particle size of diatomite, pH and initial MG concentration were investigated through liquid-phase adsorption processes. Several equilibrium isotherm models were applied. It was found that initial MG concentration, pH and particle size of diatomite had a significant effect on the adsorption process. MG uptake has increased from 99.3 mg/dm3 to 898.7 mg/dm3 over the whole concentration range. A high percentage of MG removal (99.6%) was achieved as the diatomite particle size decreased from 500-710μm to 125-250μm. The optimum pH for the removal of MG was=9. Freundlich model was satisfactorily applied to the experimental data.

Preparation of titanate nanoflower for sorption of 75Se(IV) radioisotope from aqueous solution: Equilibrium, kinetic and thermodynamic studies

2015 ◽  
Vol 103 (12) ◽  
Author(s):  
Sahar El-Sayed Abd El-Kader Sharaf El-Deen ◽  
Karam Fatwhi Allan ◽  
Mohamed Holeil ◽  
Gehan El-Sayed Abd El-Kader Sharaf El-Deen
Keyword(s):  
Aqueous Solution ◽  
Electrostatic Interactions ◽  
Outer Sphere ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
X Ray ◽  
Adsorptive Removal ◽  
Order Kinetic Model

AbstractIn this study, the adsorptive removal of selenium (IV) from aqueous solution by titanate nanoflower (TNF) was prepared via alkaline hydrothermal method. The morphology and crystal phase of the TNF were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscope (EDX), selected area electron diffraction (SAED), thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR) and specific surface area. This study was conducted to determine the influence of various operating parameters such as pH, adsorbate weight, initial anion concentration, contact time and solution temperature on the adsorptive removal of selenium (IV). Equilibrium adsorption data were analyzed using Freundlich, Langmuir and Dubinin–Radushkevich (D–R) isotherm models. The results demonstrated that the adsorption was well described by the Langmuir adsorption isotherm with the maximum adsorption capacity up to 46.52 mg/g at pH 3.5. The adsorption of Se(IV) anions onto the surface of TNF may proceed through outer sphere electrostatic interactions and/or inner-sphere complexation interaction. The kinetic data indicated that the adsorption fit well with the pseudo-second-order kinetic model. The thermodynamic parameters implied that the adsorption process was spontaneous and endothermic in nature.

Preparation of Alkali-Treaded Fly Ash Adsorbent and its Application for Cd2+ Removal from Aqueous Solution

2012 ◽  
Vol 550-553 ◽  
pp. 2155-2159 ◽  
Author(s):  
Bei Gang Li ◽  
Li Yuan Zhao ◽  
Chen Wang
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Fly Ash ◽  
Preparation Conditions ◽  
Effective Removal ◽  
Adsorbate Concentration ◽  
Adsorption Processes ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Kinetics Of

The modified fly ash (MFA) was prepared by calcining raw coal fly (FA) ash with Na2CO3 at high temperature. The preparation conditions of MFA and Effects of important parameters such as contact time, adsorbate concentration, pH and temperature on the sorption were researched, respectively. MFA obtained at calcining temperature of 550°C and FA/Na2CO3 mass ratio of 12 shows the effective removal for Cd2+ from aqueous solution, and the maximum removal was close to 100% with the adsorbent dosage of 10 g/L, initial Cd2+ concentration of 200 mg/L at 25°C. The adsorption kinetics of Cd2+ on MFA followed the pseudo-second-order model well and adsorption processes might be mainly controlled by intra-particle diffusion. The sorption is favourable at high temperature and the adsorption apparent activation energy was 68.08 kJ/mol which indicates the chemical nature of the adsorption.

scholarly journals Surface Modification of Powdered Maize Husk with Sodium Hydroxide for Enhanced Adsorption of Pb(II) Ions from Aqueous Solution

2020 ◽  
Vol 9 (1) ◽  
pp. 95-104
Keyword(s):  
Aqueous Solution ◽  
Sodium Hydroxide ◽  
Removal Efficiency ◽  
Adsorption Process ◽  
Lead Ions ◽  
Solution Temperature ◽  
Lead Ion ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorbent Dose

The impact of sodium hydroxide pretreatment of maize husk on its lead ion removal efficiency was investigated. Pretreatment of maize husk with this alkali increased its surface area and porosity from 528.74 m2/g and 0.477 cm3/g to 721.54 m2/g and 0.642 cm3/g, respectively. Batch adsorption studies were carried out to evaluate the effects of initial pH, adsorbent dose, initial lead ion concentration, initial solution temperature, and contact time on the adsorption process. The maximum removal efficiency of maize husk at pH 5 and adsorbent dose 2 g/L was 62.85 %, which increased to 82.84 % after pretreatment and was attained in 15 min. The adsorption data for the natural and pretreated maize husk were best fitted in the Freundlich isotherm model, with their adsorption intensity (n) having values >1, which indicated that lead ion adsorption onto the adsorbent types was a favorable physical process. The adsorption of lead ions onto the adsorbents followed the pseudo-first-order kinetic model. The experimental adsorption capacities of maize husk (31.43 mg/g) and its modified form (41.22 mg/g) were very close to those obtained from this model (31.03 mg/g and 40.65 mg/g respectively). The ΔH and ΔG values of the adsorption process showed that the adsorption of lead ions by both adsorbents was an endothermic process and occurred spontaneously. Alkali pretreated maize husk can therefore be used as a cheap adsorbent to remove lead ions from aqueous solution.

scholarly journals Adsorption Capabilities of Activated Carbon Derived from Detarium microcarpum Seeds in Removing Co2+ and Pb2+ from Wastewater

2020 ◽  
pp. 167-179
Author(s):  
Ishaq Yahaya Lawan ◽  
Shinggu D. Yamta ◽  
Abdurrahman Hudu ◽  
Kolo Alhaji Madu ◽  
Adamu Mohammad ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Metal Ion ◽  
Adsorption Process ◽  
Ion Concentration ◽  
Adsorption Efficiency ◽  
Cobalt Ions ◽  
Initial Concentration ◽  
Detarium Microcarpum ◽  
Percentage Removal

This study was carried out to evaluate the efficiency of metals (Pb and Co) removal from solution using Detarium microcarpum seeds as adsorbent. The effect of initial concentration and adsorbent dosage on the adsorption process of these metals were studied, the percentage removal of these metals increased with increased in weight (0.5 -2.5g) in 50ml of the solution and the adsorption efficiency increased with increasing initial metal ion concentration (0.01-0.05 moldm−3). The percentage removal obtained for Lead and Cobalt were compared. The result of adsorption were fitted to Langmuir models and coefficients indicated favorable adsorption of Pb2+ and Co2+ ions on the adsorbents. The adsorption of Pb2+ and Co2+ in aqueous solution was in the following order (1400µm>420µm>150µm). More than 55.4% of studied Lead cations were removed by 1400µm, 47.2% by 420µm and 29.8% by 150µm. While for Cobalt cations only 53.2% by 1400µm, 38.6% by 420µm and 24% by 150µm respectively, from aqueous solution it was concluded that, activated Carbon derived from Detarium microcarpum seed is good in removing both lead and cobalt ions, which make it good absorbent.

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