scholarly journals Error analysis of adsorption isotherm models for penicillin G onto magnesium oxide nanoparticles

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Somayeh Rahdar ◽  
Abbas Rahdar ◽  
Mina Khodadadi ◽  
Shahin Ahmadi
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Magnesium Oxide ◽  
Contact Time ◽  
Penicillin G ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Mgo Nanoparticles ◽  
Magnesium Oxide Nanoparticles ◽  
Adsorption Isotherm Models

Abstract The adsorption of penicillin G (PC-G) from aqueous solution by magnesium oxide (MgO) nanoparticles has been investigated. This experimental study was conducted in a laboratory scale. The effects of various operating parameters such as pH (3–11), the dosage of MgO nanoparticles (0.3–1.5 g/L), contact time (20–150 min), and concentration of PC-G (50–200 mg/L) were studied. The results showed that under optimal conditions of concentration of 50 mg/L, pH 3, MgO nanoparticles dosage of 1.5 g/L and contact time of 60 min, the maximum adsorption capacity (qm) of PC-G adsorption on MgO nanoparticles obtained was 25.66 mg/g. The process of penicillin G adsorption on MgO nanoparticles was found to depend on Langmuir (II) and Langmuir (III) adsorption isotherm models. It could be concluded that the MgO nanoparticles can be used for PC-G removal from its aqueous solution.

Biogenic Jarosite: A Friendly Adsorbent for the Removal of Chromate from Aqueous Solution

2015 ◽  
Vol 737 ◽  
pp. 533-536 ◽  
Author(s):  
Dong Xue Xiao ◽  
Chang Ling Fang ◽  
Jun Zhou ◽  
Xiao Yi Lou ◽  
Jiu Hua Xiao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Mine Drainage ◽  
Langmuir Adsorption Isotherm ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Langmuir Adsorption ◽  
Adsorption Isotherm Models ◽  
Optimum Ph ◽  
Sulfate Leaching

Ferric hydrosulfate minerals are commonly byproducts of biotic oxidation of Fe (II) in acid mine drainage and biohydrometallurgy like biogenic jarosite. In this study, adsorption of Cr (VI) on jarosite was a rapid process and the optimum pH for Cr (VI) adsorption was found at 7.0. The variation of Cr (VI) adsorbed on jarosite fitted the Langmuir adsorption isotherm models and the maximum adsorption capacity was 3.23 mg/g. It was evident that anion exchange mechanism was responsible for Cr (VI) adsorption on jarosite based on the sulfate leaching data and optimum pH experiments.

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.

Carbonized medlar-core particles as a new biosorbent for removal of Cu2+ from aqueous solution and study of its surface morphology

2016 ◽  
Vol 74 (1) ◽  
pp. 236-245 ◽  
Author(s):  
Narges Samadani Langeroodi ◽  
Elaheh Safaei
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
High Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Isotherm Models ◽  
Freundlich Adsorption Isotherm ◽  
High Adsorption Capacity ◽  
Core Particles

The objective of this study was to investigate the use of carbonized medlar-core particles as a new biosorbent to remove Cu2+ from aqueous solution. Fourier transform infrared spectroscopy and scanning electron microscopy were used to characterize the biosorbent. This paper reports the effects of adsorbent dose, pH, temperature and concentration of adsorbate. Batch isotherm studies were also performed to understand the ability of the adsorbent. The adsorption behavior of the Cu2+ was studied using Langmuir and Freundlich adsorption isotherm models. The maximum adsorption capacity determined from the Langmuir adsorption equation has been found as 43.478 mg.g−1 at 298.15 K. The adsorption of Cu2+ by medlar core in carbonized form was spontaneous and endothermic. It was also found that the biosorption of Cu2+ followed second-order kinetics. Carbonized medlar-core particles showed great potential in aqueous solution due to the high adsorption capacity.

scholarly journals ADSORPTION OF FLUORIDE USING SIO2 NANOPARTICLES AS ADSORBENT

2020 ◽  
Vol 2 (2) ◽  
pp. 1-9
Author(s):  
Davoud Balarak ◽  
Yousef Mahdavi ◽  
Ali Joghatayi
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Sio2 Nanoparticles ◽  
Second Order ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Initial Concentration ◽  
High Doses

Presence of Fluoride in water is safe and effective when used as directed, but it can be harmful at high doses. In the present paper SiO2 nanoparticles as a adsorbent is used for removal of fluoride from aqueous solution. The effect of various operating parameters such as initial concentration of F-, Contact time, adsorbent dosage and pH were investigated. Equilibrium isotherms were used to identify the possible mechanism of the adsorption process. Maximum adsorption capacity of the SiO2 nanoparticles was 49.95 mg/g at PH=6, contact time 20 min, initial concentration of 25 mg/L, and 25±2 ◦C temperatures, when 99.4% of Fwere removed. The adsorption equilibriums were analyzed by Langmuir and Freundlich isotherm models. It was found that the data fitted to Langmuir (R2=0.992) better than Freundlich (R2=0.943) model. Kinetic analyses were conducted using pseudo first-and second-order models. The regression results showed that the adsorption kinetics was more accurately represented by a pseudo second-order model. These results indicate that SiO2 nanoparticles can be used as an effective, low-cost adsorbent to remove fluoride from aqueous solution.

Effective Removal of Nickel(II) Ion by Using Nano Fe3O4

2013 ◽  
Vol 678 ◽  
pp. 7-11
Author(s):  
Gomathinayagam Kanthimathi ◽  
P. Kotteeswaran ◽  
M. Kotaisammy
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Contact Time ◽  
Isotherm Models ◽  
Batch Method ◽  
Effective Removal ◽  
Nano Fe3o4 ◽  
Average Size ◽  
20 Nm ◽  
Equilibrium Adsorption Isotherm

In the present study, the application for the removal of Nickel (II) ion from aqueous solution by using synthetic nano Fe3O4 with the average size of 20 nm was investigated by batch method, as a function of concentration, adsorbent dosage, contact time and pH. The equilibrium adsorption isotherm data are tested by applying both Freundlich and Langmuir isotherm models.

Atomic Absorption Spectral Studies on the Removal of Lead (II) Ion by Using Synthetic Nano and Macro Fe3O4

2012 ◽  
Vol 584 ◽  
pp. 173-177
Author(s):  
Gomathinayagam Kanthimathi ◽  
Pechimuthu Kotteeswaran ◽  
Muniasamy Kottaisamy
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Contact Time ◽  
Spectral Studies ◽  
Isotherm Models ◽  
Batch Method ◽  
Nano Fe3o4 ◽  
Average Size ◽  
20 Nm ◽  
Equilibrium Adsorption Isotherm

In the present study, the application for the removal of Lead(II) ion from aqueous solution by using synthetic nano Fe3O4 with the average size of 20 nm was investigated by batch method, as a function of concentration, adsorbent dosage, contact time and pH. The equilibrium adsorption isotherm data are tested by applying both Freundlich and Langmuir isotherm models. Macro Fe3O4 was also applied for the removal of Lead(II) ion at the optimum condition of nano Fe3O4 and its efficiency was compared.

Adsorption of Cadmium from Aqueous Solution by Biomass: Comparison of Solid Pineapple Waste, Sugarcane Bagasse and Activated Carbon

2013 ◽  
Vol 832 ◽  
pp. 810-815 ◽  
Author(s):  
M.S. Rosmi ◽  
S. Azhari ◽  
R. Ahmad
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Sugarcane Bagasse ◽  
Contact Time ◽  
Agricultural Waste ◽  
Palm Kernel ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Adsorbent Dosage ◽  
Pineapple Waste

The use of low-cost adsorbent derived from agricultural waste has been investigated for the removal of Cd (II) from aqueous solution. This research reports the feasibility of using solid pineapple waste (SPW), sugarcane bagasse (SCB) and activated carbon (AC) derived from palm kernel for the removal of Cd (II) under different experimental conditions. Batch experiments were carried out at various pH (3-12), adsorbent dosage (0.01-2 g) and contact time (15-150 min). The maximum Cd (II) removal was shown by SPW (90%) followed by SCB (55%) and AC (30%) at pH 7 with a contact time of 120 min, adsorbent dosage of 1.0 g and at 1.0 ppm of the initial concentration of Cd (II) solution. The kinetics study shows that the adsorption process fitted the pseudo-second-order-model. The experimental data was analysed by both Freundlich and Langmuir isotherm models. It was found that the Langmuir model appears to well fit the isotherm. The Langmuir maximum adsorption capacity calculated from Langmuir for SPW, SBC and AC were 0.3332 mg/g, 0.1865 mg/g and 0.1576 mg/g respectively. The order of Cd (II) removal by the adsorbents was SPW>SCB>AC. Thus, SPW may be an alternative adsorbent for the removal of Cd (II) ions form aqueous solution. The characterization of the SPW, SCB and AC were also carried out by using Scanning Electron Microscopy (SEM) and Nitrogen Gas Adsorption Single Point Surface Area Analyzer (BET).

scholarly journals Chemically modified sugarcane bagasse as a biosorbent for dye removal from aqueous solution

2020 ◽  
Vol 2 (6) ◽  
pp. 175-181
Author(s):  
Ho Thi Yeu Ly ◽  
Hoang Thi Khanh Dieu ◽  
Trinh Minh Tan Sang ◽  
Le Nguyen Minh Nha
Keyword(s):  
Aqueous Solution ◽  
Citric Acid ◽  
Sugarcane Bagasse ◽  
Low Cost ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Adsorption Parameters ◽  
Chemically Modified ◽  
Adsorption Isotherm Models ◽  
Initial Ph

The use of adsorbent prepared from sugarcane bagasse, an agro waste from sugar industries has been studied as an alternative substitute for activated carbon for the removal of dyes from aqueous solution. Adsorbents prepared from sugarcane bagasse modified with citric acid was used as a low-cost biosorbent for removal of dyes from the aqueous solution. Adsorption parameters such as initial pH values, dyes concentrations, adsorbent dosages and contact times were investigated by the batch experiments. The Freundlich and Langmuir adsorption isotherm models were used to evaluate the experimental data. The results showed that the adsorption process of dyes onto the modified sugarcane bagasse leaned towards Langmuir model for MSB and Freundlich for SB. Maximum adsorption capacity of MSB was found to be 8.40 mg/g at pH 9. The results showed that the modified sugarcane bagasse with citric acid could be a potential low-priced adsorbent for removal of the color from the aqueous solution.  

scholarly journals Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Johnatan D. Castro-Castro ◽  
Iván F. Macías-Quiroga ◽  
Gloria I. Giraldo-Gómez ◽  
Nancy R. Sanabria-González
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Organic Contaminants ◽  
Low Cost ◽  
Quadratic Model ◽  
Coefficient Of Determination ◽  
Isotherm Models ◽  
Model Parameters ◽  
Maximum Adsorption Capacity ◽  
Hexadecyltrimethylammonium Bromide

Clay minerals can be modified organically by a cationic surfactant resulting in materials known as organoclays. The organoclays have been used as adsorbents of most of the organic contaminants in the aqueous solution and oxyanions of the heavy metal. In this study, a Colombian bentonite was modified with hexadecyltrimethylammonium bromide to obtain an organobentonite, and its capacity to adsorb Cr(VI) oxyanions in the aqueous solution was evaluated. The effect of pH, stirring speed, adsorbent amount, contact time, and ionic strength were investigated at 25°C. Stirring speeds above 200 rpm, contact times greater than 120 min, and the addition of NaCl (0.1 to 2.0 mM) did not have a significant effect on Cr(VI) removal. The influence of the adsorbent amount and pH on Cr(VI) adsorption was studied by the response surface methodology (RSM) approach based on a complete factorial design 32. Results proved that the Cr(VI) adsorption follows a quadratic model with high values of coefficient of determination (R2 = 95.1% and adjusted R2 = 93.9%). The optimal conditions for removal of Cr(VI) from an aqueous solution of 50 mg/L were pH of 3.4 and 0.44 g amount of the adsorbent. The adsorption isotherm data were fitted to the Langmuir and Freundlich adsorption isotherm models, and the model parameters were evaluated. The maximum adsorption capacity of Cr(VI) onto organobentonite calculated from the Langmuir model equation was 10.04 ± 0.34 mg/g at 25°C. The results suggest that organobentonite is an effective adsorbent for Cr(VI) removal, with the advantage of being a low-cost material.

Chromium (VI) Adsorption on Activated Lignin

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
Nassima Tazerouti ◽  
Moussa Amrani
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Analytical Data ◽  
Correlation Coefficients ◽  
Second Order ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Chromium Vi ◽  
Pseudo Second Order

Activated lignin, having a surface area of 1023 m2 g-1, has been prepared from lignin sulfate that was treated by 30% H2O2 and carbonized at 300°C in order to test the chromium (VI) adsorption from aqueous solution. The influence of contact time, pH, initial concentration of adsorbent and adsorbate and temperature on the adsorption capacity was investigated. The maximum removal of Cr(VI) was found to be 92.36% at pH=2 and a contact time of 80 min. Optimal concentration of lignin and Cr(VI) was found to be 3.8 gL-1 and 180mg L-1, respectively. The adsorption kinetics was examined with pseudo-first-order and pseudo-second-order equations. The analytical data fit well to the pseudo-second-order equation, and the rate of removal of chromium was found to speed up by increasing the temperature. Activation energy for the adsorption process was found to be 18.19 KJ mol-1. The Langmuir-Freundlich adsorption isotherm models were applied to describe the isotherm and its constants for the adsorption of Cr(VI) on lignin. These constants and correlation coefficients of the isotherm models were calculated and compared with each other. Results indicated that Cr(VI) uptake could be described by the Langmuir adsorption isotherm. The maximum adsorption capacity (qmax) of Cr(VI) on lignin was 75.75 mg g-1 at a temperature of 40°C. The dimensionless equilibrium parameter (RL) signified a favorable adsorption of Cr(VI) on lignin and was found to be between 0.0601 and 0.818 (0L<1). The thermodynamic parameters such as ?G°, ?S°, and ?H° were calculated and it has been found that the reaction was spontaneous and endothermic in nature. This study indicates that lignin has the potential to become an effective and economical adsorbent for the removal of Cr(VI) from waste water.

Sign in / Sign up

Export Citation Format

Share Document