Removal of Benzene from Aqueous Solution Using Carbon Nanotube Synthesized from Fuel Oil Waste

2014 ◽  
Vol 925 ◽  
pp. 105-109
Author(s):  
Ismail Al-Khateeb ◽  
Ahmed M. Mohammed ◽  
Adawiya J. Haider ◽  
Y. Al-Douri
Keyword(s):  
Aqueous Solution ◽  
Carbon Nanotube ◽  
Power Plants ◽  
Equilibrium Constants ◽  
Fuel Oil ◽  
Order Model ◽  
Adsorption Models ◽  
First Order ◽  
Adsorption Data ◽  
Enthalpy And Entropy

This investigation is dealing with adsorption of benzene compound from aqueous solution using a new carbon nanotube (CNT) synthesized from a fuel oil waste of power plants which identify by FE-SEM and TEM. It was found that a CNT has a very significant adsorption for benzene compared to that of non-activated carbon. The equilibrium adsorption data were analyzed using adsorption models of Langmuir, Freundlich and Temkin. The results showed that the model isotherms are fitting very well with the experimental data. Kinetic study was conducted and the results pointed out that a pseudo-first order model was represented the data. Values of the activation thermodynamic functions were calculated through equilibrium constants at different temperature. All values of Gibbs functions were negative with values of-1.6 and-13.0 kJmol-1 for non-active and CNT respectively, while values of enthalpy and entropy were about-33kJmol-1 and-65JK-1 mol-1 for CNT respectively. These results indicated that the adsorption process was feasible, spontaneous and exothermic.

Kinetics and mechanism of gold(III) incorporation into tetrakis(1-methylpyridium-4-yl)porphyrin in aqueous solution

2004 ◽  
Vol 08 (11) ◽  
pp. 1269-1275 ◽  
Author(s):  
Ahsan Habib ◽  
Masaaki Tabata ◽  
Ying Guang Wu
Keyword(s):  
Aqueous Solution ◽  
Rate Constants ◽  
Kinetic Data ◽  
Ph Dependence ◽  
Equilibrium Constants ◽  
Hydroxyl Group ◽  
Net Charge ◽  
First Order ◽  
Kinetics Of ◽  
Hydrolysis Of

The kinetics of the reaction of the tetrakis(1-methylpyridium-4-yl)porphyrin tetracation, [ H 2( TMPyP )]4+, with gold(III) ions were studied along with equilibria of gold(III) species in aqueous medium at 25°C, I = 0.10 M ( NaNO 3). The equilibrium constants for the formation of [ AuCl 4-n( OH ) n ]- ( n = 0,…,4), defined as β n = [ AuCl 4- n ( OH ) n ]- [ Cl -] n / [ AuCl 4-][ OH -] n were found to be that log β1 = 7.94 ± 0.03, log β2 = 15.14 ± 0.03, log β3 = 21.30 ± 0.05 and log β4 = 26.88 ± 0.05. The overall reaction was first order with respect to each of the total [ Au (III)] and [ H 2 TMPyP 4+]. On the basis of pH dependence on rate constants and the hydrolysis of gold(III), the rate expression can be written as d [ Au ( TMPyP )5+]/ dt = ( k 1[ AuCl 4-] + k2[ AuCl 3( OH )-] + k3[ AuCl 2( OH )2-] + k4[ AuCl ( OH )3-])[ H 2 TMPyP 4+], where k1, k2, k3 and k4 were found to be (2.16 ± 0.31) × 10-1, (6.56 ± 0.19) × 10-1, (1.07 ± 0.24) × 10-1, and (0.29 ± 0.21) × 10-1 M -1. s -1, respectively. The kinetic data revealed that the trichloromonohydroxogold(III) species, [ AuCl 3( OH )]-, is the most reactive. The higher reactivity of [ AuCl 3( OH )]- is explained by hydrogen bonding formation between the hydroxyl group of [ AuCl 3( OH )]- and the pyrrole hydrogen atom of [ H 2( TMPyP )]4+. Furthermore, applying the Fuoss equation to the observed rate constants at different ionic strengths, the apparent net charge of [ H 2( TMPyP )]4+ was calculated to be +3.5.

scholarly journals Adsorption of Crude Oil Spill from Aqueous Solution using Agro-Wastes as Adsorbents

2021 ◽  
pp. 27-52
Author(s):  
Akinsete O. Oluwatoyin ◽  
Araoye A. Olalekan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Carbon Adsorbents ◽  
Banana Peel ◽  
Rice Husks ◽  
Order Model ◽  
First Order ◽  
Pseudo Second Order ◽  
Crude Oil Spill

Ever increasing and growing awareness of oil-spillage to water environment has led to the search for cost-effective unconventional remediating techniques. This study was carried out using agro-wastes (Rice Husks, Banana Peels and Groundnut Husks) adsorbents. They were activated with H3PO4 for crude oil spill removal from aqueous solution; results were analysed using atomic absorption spectroscopy. The raw agro-wastes and their activated forms were characterized by SEM. The sorption study for maximum adsorption capacity were carried out at different adsorbent concentrations, adsorbent dosage, contact time, pH and rotational speed. The experimental results were analysed using Langmuir, Freundlich, Temkin, Dubinin-Radushkevich isotherm models. The maximum average adsorption capacity (qe) for raw and activated carbon adsorbents were observed in rice husks with 0.2750 and 0.3698 mg/g respectively. The Langmuir isotherm was found to well represent the measured sorption data for the raw and activated banana peel while the remaining raw and activated adsorbents followed the Temkin isotherm. The batch adsorption data on the effect of contact time were fitted into the pseudo-first-order and pseudo-second order models. The banana peel data and its activated form were best described by the pseudo-second-order model indicating chemisorption process while the remaining adsorbents followed the pseudo-first-order model indicating physisorption process. The average removal efficiency of oil by the various adsorbents used increase in the order: (Raw: Banana Peels (50.4 %) < Groundnut Husks (56.8 %) < Rice Husks (74.4 %); Activated Carbon: Banana Peels (61.4 %) < Groundnut Husks (65.6 %) < Rice Husks (82.8 %)). Results of this study (high values of R2 and least values AARE and RMSE) revealed and confirmed that activated carbon adsorbents have better adsorption capacity than the raw forms to clean-up oil spills in aqueous solution.

scholarly journals Biosorption of Pb(II) and Zn(II) by Extracellular Polymeric Substance (Eps) of Rhizobium Radiobacter: Equilibrium, Kinetics and Reuse Studies

2013 ◽  
Vol 39 (2) ◽  
pp. 129-140 ◽  
Author(s):  
Lili Wang ◽  
Jixian Yang ◽  
Zhonglin Chen ◽  
Xiaowei Liu ◽  
Fang Ma
Keyword(s):  
Aqueous Solution ◽  
Extracellular Polymeric Substance ◽  
Kinetics Study ◽  
Order Model ◽  
Rhizobium Radiobacter ◽  
Promising Alternative ◽  
First Order ◽  
Ph Values ◽  
Polymeric Substance ◽  
Equilibrium Data

Abstract The extracellular polymeric substance (EPS) produced from Rhizobium radiobacter F2, designated as EPSF2, was investigated as a biosorbent for the removal of Pb(II) and Zn(II) from aqueous solution. The optimum biosorption pH values were 5.0 for Pb(II) and 6.0 for Zn(II). Kinetics study revealed that the biosorption followed pseudo-first-order model well, and the equilibrium data fit the Langmuir model better. The adsorbed metal ions could be effectively desorbed by HCl. Desrobed EPSF2 regained 80% of the initial biosorption capacity after five cycles of biosorption-desorption-elution. These results demonstrated that EPSF2 could be a promising alternative for Pb(II) and Zn(II) removal from aqueous solution.

A Study on Lead Adsorption by the Hen Egg Shells from Enshi, Hubei Province, China

2019 ◽  
Vol 294 ◽  
pp. 11-16
Author(s):  
Heng Heng Gong ◽  
Tao Li ◽  
Wen Ya Zhang ◽  
Zhao Jiang Liao
Keyword(s):  
Aqueous Solution ◽  
Hubei Province ◽  
Lead Ions ◽  
Lead Ion ◽  
Water Quality Standards ◽  
Order Model ◽  
Lead Adsorption ◽  
First Order ◽  
Egg Shells ◽  
Hen Egg

The hen egg shells (HES) from EnShi, HuBei Province, China, which contain selenium, are used as adsorbent for the adsorption of lead ion from its aqueous solutions. The selenium in the HES could help to remove lead from its aqueous solution. The HES had been found to be the more efficient in the experiment and removed about 95% of lead from its aqueous solution. The final concentration of lead ion was found lower than the waste water quality standards from the initial concentration of lead ion 100.0 mg/L through these two steps of adsorptions. One gram of the HES can adsorb nearly 31.71±0.040 mg of lead ions. The adsorption kinetics was fitted by first-order model throughout the period. The present adsorption process is spontaneous, indicating HES can be availably used for the removal of lead ions from its aqueous solution.

Research on Adsorption of Pb2+ on to Microspheres Prepared by Rectorite and Humic Acid

2011 ◽  
Vol 233-235 ◽  
pp. 1972-1980 ◽  
Author(s):  
Yu Bin Tang ◽  
Fang Yu ◽  
Fang Yan Chen ◽  
Cheng Chen
Keyword(s):  
Humic Acid ◽  
Adsorption Process ◽  
Batch Adsorption ◽  
Order Model ◽  
Experimental Conditions ◽  
First Order ◽  
Adsorption Data ◽  
Exchange Adsorption ◽  
Elovich Equation ◽  
Pseudo Second Order

Rectorite (REC), humic acid (HA) and polyvinyl alcohol (PVA) were used to prepare microspheres. Batch adsorption experiments of Pb2+ion on to the microspheres were performed. The results obtained indicate that adsorption time, the microspheres dosage and temperature were the main factors influencing the adsorptive capacities. The adsorption data for Pb2+ion were well described by the Freundlich, Langmuir and Temkin models. The kinetic experimental data properly correlated with the pseudo-first-order model, pseudo-second-order model and Elovich equation. The adsorption process is spontaneous, endothermic and out-of-order. The whole adsorption process is mainly controlled by entropies. The adsorption can be classified as chemical adsorption. The mechanisms for the adsorption of Pb2+ion on to the microspheres involved ion-exchange adsorption of Pb2+or the formation of complex compound. Under the experimental conditions employed, the removal of Pb2+ion attained value of 96.05%.

scholarly journals Synthesis and Characterization of Methionine-Functionalized Boehmite with Enhanced Removal of Methyl Orange

2021 ◽  
Vol 12 (5) ◽  
pp. 5845-5859
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Synthesis Method ◽  
Mesoporous Structure ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
First Order ◽  
Adsorption Data

Methionine, an amino acid with thioether, carboxyl, and amino functional groups, was used to enhance the adsorption capacity of boehmite toward methyl orange (MO). An environmentally friendly synthesis method was performed to prepare the methionine-functionalized boehmite (MFB) at 70°C using water as the solvent. The MFB has prominent XRD characteristic peaks at 2θ = 14.5°, 28.6°, 38.4°, and 48.4°. The addition of functional groups from methionine was indicated by the appearance of FTIR bands at 2094, 1424, and 1220 cm-1 corresponding to carboxyl, amino, and thioether groups, respectively. The N2 isotherm curve indicates the mesoporous structure of MFB, with surface area, pore-volume, and mean pore width of 287 m2 g-1, 0.996 cm3 g-1, 13.85 nm, respectively. The kinetic adsorption data showed a good fitting with the pseudo-first-order model, where the equilibrium can be achieved within 50 min. The adsorption of MO by MFB was better correlated with the Langmuir model with a maximum adsorption capacity of 167.4075 mg g-1, which was achieved at 323 K. The thermodynamic study reveals that the adsorption of MO on MFB was an endothermic and spontaneous process.

The study of adsorption characteristics of electrospun polymer nanofibers for benzenes in water

2011 ◽  
Vol 64 (2) ◽  
pp. 528-533 ◽  
Author(s):  
Jing Sun ◽  
Xue-Jun Kang ◽  
Yu-Qin Ma ◽  
Li-Qin Chen ◽  
Yu Wang ◽  
...  
Keyword(s):  
Standard Free Energy ◽  
Kinetic Studies ◽  
Polymer Nanofibers ◽  
Order Model ◽  
Adsorption Models ◽  
First Order ◽  
Freundlich Isotherms ◽  
Adsorption Performance ◽  
Adsorption Equilibria ◽  
Adsorption Desorption

The adsorption properties of benzene, p-dichlorobenzene and nitrobenzene on polymer nanofibers were studied. Compared with polyacrylonitrile nanofiber, polystyrene (PS) nanofiber presented better adsorption performance. Langmuir and Freundlich adsorption models were used for the mathematical description of adsorption equilibria, and Freundlich isotherms fitted better. Kinetic studies showed that the adsorption of PS nanofiber followed pseudo first-order model. Various thermodynamic parameters such as standard free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) were calculated for predicting the adsorption nature of PS nanofiber for three benzenes, which indicated that the adsorption was spontaneous and a physical process. The regeneration efficiency maintains over 80% after five cycles of adsorption/desorption tests. It showed that PS nanofibers are promising candidates for adsorption and removal of aromatic hydrocarbons from water.

scholarly journals Kinetic and equilibrium studies of biosorption of M(II) (M = Cu, Pb, Ni, Zn and Cd) onto seaweed Posidonia oceanica fibers

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Wassila Boulaiche ◽  
Badreddine Belhamdi ◽  
Boualem Hamdi ◽  
Mohamed Trari
Keyword(s):  
Posidonia Oceanica ◽  
Second Order ◽  
Order Model ◽  
Equilibrium Studies ◽  
First Order ◽  
Metal Biosorption ◽  
Batch System ◽  
Adsorption Data ◽  
Equilibrium Data ◽  
Pseudo Second Order

Abstract This work reports the application of Posidonia oceanica for the elimination of heavy metals M(II) (M = Zn, Cd, Ni, Cu and Pb) by biosorption in batch system. The effect of the contact time, initial M concentration, pH and temperature was considered. The kinetic and equilibrium models for the M-biosorption were tested namely the pseudo-first-order, pseudo-second-order and Elovich kinetic models. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms models have also been used to fit equilibrium adsorption data. The adsorption kinetics follow a pseudo-second-order model for all studied systems, and the equilibrium data are suitably fitted by the above models. The amount of adsorbed metals by biosorption is 48.33, 43.9, 41.02, 37.90 and 30.22 mg/g for Pb(II), Cu(II), Ni(II), Zn(II) and Cd(II), respectively. The thermodynamic parameters suggested that the metal biosorption is spontaneous with an endothermic nature.

Toluene vapor sensing characteristics of novel copper(II), indium(III), mono-lutetium(III) and tin(IV) phthalocyanines substituted with 2,6-dimethoxyphenoxy bioactive moieties

2018 ◽  
Vol 22 (01n03) ◽  
pp. 189-197 ◽  
Author(s):  
Mehmet Pişkin ◽  
Nursel Can ◽  
Zafer Odabaş ◽  
Ahmet Altındal
Keyword(s):  
Order Model ◽  
Vapor Detection ◽  
First Order ◽  
Vapor Sensing ◽  
Toluene Vapor ◽  
Adsorption Data ◽  
Elovich Equation ◽  
Detection Capabilities ◽  
Kinetics Of ◽  
Sensing Characteristics

This study presents the synthesis, characterization and toluene sensing properties of copper(II), indium(III) acetate, mono-lutetium(III) acetate and tin(IV) phthalocyanines substituted with 2,6-dimethoxyphenol bioactive groups at the peripheral and non-peripheral positions. The effects of the substituent’s position on the toluene vapor detection capabilities of these compounds were investigated. Adsorption data were analyzed by using first-order and Elovich equations in order to investigate the adsorption kinetics. It was found that the kinetics of the toluene adsorption strongly depends on the position of the substituent groups. Our results showed that the Elovich equation fits the experimental data well for non-peripherally substituted Pc based sensors, while the pseudo first-order model best describes the adsorption data for peripheral substituted Pc based sensors.

scholarly journals Purification of waste water from cationic dye using SPGMA polymer: Isotherm and Kinetic study

2020 ◽  
Keyword(s):  
Waste Water ◽  
Dye Removal ◽  
Solution Temperature ◽  
Order Model ◽  
First Order ◽  
Sorbent Material ◽  
Maximum Value ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
The Common

<p>One of the known methods for dye removing from waste water is using sorbent material for fine removal of dye .The nano- cation exchanger Sulphonated poly glycidyl methacrylate (SPGMA polymer) was used as sorbent material for removing one of the common cationic dyes. SPGMA polymer was prepared and characterized to ensure its surface ability to sorb dye. Percentage removal of Methylene Blue using SPGMA polymer was studied by changing different parameters as sorbent amount, stirring speed, pH and solution temperature. The maximum value for dye removal was about 98%. Adsorption data from experimental work shows that the results fit the pseudo first order model for all parameters studied except for pH study fits pseudo second order. Also sorption mechanism for SPGMA polymer was studied for different dye concentration.</p>

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