Nitro- and Amino Derivatives of Petroleum Asphaltenes: Application to Phenol Adsorption

The sorption properties of native and modified petroleum asphaltenes with respect to phenol have been studied under static conditions. Modification of asphaltenes was carried out by nitration, followed by reduction with sodium sulfide. Based on the data obtained, phenol sorption isotherms were constructed and the equations for the adsorption processes were calculated. It was found that the adsorption isotherms can be described most correctly by the Freundlich and Langmuir equations. It was revealed that the process is carried out due to physical adsorption.

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Adsorption of Phenol by Nitro and Amino Derivatives of Petroleum Asphaltenes

Chemistry and Technology of Fuels and Oils ◽

10.1007/s10553-021-01303-1 ◽

2021 ◽

Author(s):

O. A. Nagornova ◽

L. E. Foss ◽

K. V. Shabalin ◽

L. I. Musin ◽

D. N. Borisov ◽

...

Keyword(s):

Petroleum Asphaltenes ◽

Amino Derivatives ◽

Derivatives Of

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OPTIMIZATION AND SORPTION ISOTHERMS ANALYSIS OF ANIONIC DYE EOSIN YELLOW DECONTAMINATION BY GOETHITE ADSORBENTS

Acta Scientifica Malaysia ◽

10.26480/asm.02.2020.75.81 ◽

2020 ◽

Vol 4 (2) ◽

pp. 75-81

Author(s):

Nasir Abdus- Salam ◽

Fabian Audu Ugbe ◽

Abiola Victoria Ikudayisi- Ugbe

Keyword(s):

Particle Size ◽

Physical Adsorption ◽

Sorption Isotherms ◽

Isotherm Models ◽

Sorption Data ◽

Isotherm Study ◽

Monolayer Adsorption ◽

Adsorption Isotherm Models ◽

Adsorption Processes ◽

Eosin Yellow

In this work, removal of Eosin Yellow (EY) using Natural Goethite (NGT) and Synthetic Goethite (SGT) particles was studied using batch equilibrium technique. Different parameters such as initial dye concentration, particle size (NGT only), pH, and adsorbent dose were optimized to investigate the sorbents efficiency for the dye. The experimental data were tested for fitness into five common adsorption isotherm models. The various equilibrium parameters studied were found to have remarkable influence on the adsorption processes, showing optimum removal at dye concentration (150 mg/L for EY-NGT and 200 mg/L for EY-SGT), NGT particle size (0.112mm), pH (2), and dosage (0.05g), with SGT exhibiting relatively higher adsorption efficiency. The sorption data fitted well the various isotherm models in the order; Freundlich (R2 = 0.9032) > Temkin (0.8294) > Langmuir (0.8268) > DKR (0.6431) > Flory Huggins (0.616) for EY-NGT, and Langmuir (0.9831) > Flory Huggins (0.9639) > Freundlich (0.9597) > Temkin (0.8944) > DKR (0.5993) for EY-SGT. The monolayer adsorption capacity (qm) was calculated as 1.17 and 20.80 mgg-1 for NGT and SGT respectively. Additionally, combined information obtained from the isotherm study revealed that the processes were favourable, spontaneous and proceeded by a multilayer physical adsorption on already chemisorbed layer. Conclusively, the results of this study have provided useful information on the optimum working condition and mechanism of EY uptake onto goethite surfaces.

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Removal of phenol from aqueous solution by adsorption

Canadian Journal of Civil Engineering ◽

10.1139/l06-018 ◽

2006 ◽

Vol 33 (5) ◽

pp. 546-551 ◽

Cited By ~ 14

Author(s):

Jadwiga Kaleta

Keyword(s):

Activated Carbon ◽

Contact Time ◽

Adsorption Process ◽

Freundlich Isotherm ◽

Breakthrough Curves ◽

Adsorptive Capacity ◽

Phenol Adsorption ◽

Through Flow ◽

Adsorption Processes ◽

Static Conditions

The paper presents the results of laboratory tests concerning the possibility of utilizing activated carbon produced in Poland and nonconventional adsorbents, such as modified Clarion clay and clinoptylolite, for removing organic phenol from water. The effect of contact time and pH of the model solution on the adsorption process was assessed during tests conducted under static conditions. A contact time of 30 min was considered as optimum, and the highest efficiency of the adsorption process was achieved using a pH of 7.0. Adsorbent doses affected the course and effectiveness of the adsorption process. The adsorption processes were best described by the Freundlich isotherm. On the basis of the isotherms, the adsorptive capacity of tested adsorbents was calculated. Activated carbon had an adsorptive capacity of 13.22 g/kg, modified Clarion clay 1.24 g/kg, and clinoptylolite 0.23 g/kg. The through-flow conditions were achieved by column filtration. On the basis of breakthrough curves, the adsorptive capacities were higher than those determined through static conditions, namely 61.23, 23.56, and 2.99 g/kg for activated carbon, modified Clarion clay, and clinoptylolite, respectively. Despite their inferior adsorptive characteristics, the modified Clarion clay and clinoptylolite may be applied in filtration systems prior to filters with activated carbon.Key words: phenol, adsorption process, activated carbon, modified clay, clinoptylolite.

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Synthesis, Docking Studies into CDK-2 and Anticancer Activity of New Derivatives Based Pyrimidine Scaffold and Their Derived Glycosides

Mini-Reviews in Medicinal Chemistry ◽

10.2174/1389557519666190312165717 ◽

2019 ◽

Vol 19 (13) ◽

pp. 1093-1110 ◽

Cited By ~ 5

Author(s):

Adel A.H. Abdel Rahman ◽

Ibrahim F. Nassar ◽

Amira K.F. Shaban ◽

Dina S. EL-Kady ◽

Hanem M. Awad ◽

...

Keyword(s):

Anticancer Activity ◽

Human Liver ◽

Docking Studies ◽

Cyclin Dependent Kinase ◽

Binding Interaction ◽

Enzyme Active Site ◽

Human Liver Cancer ◽

Amino Derivatives ◽

Activity Behavior ◽

Derivatives Of

Background & Objective:New diaryl-substituted pyrimidinedione compounds, their thioxo derivatives as well as their bicyclic thiazole compounds were synthesized and characterized.Methods:The glycosylamino derivatives of the synthesized disubstituted derivatives of the pyrimidine scaffold were also prepared via reaction of the N3-amino derivatives with a number of monosaccharides followed by acetylation.Results:The anticancer activity of the synthesized compounds was studied against human liver cancer (HepG2) and RPE-1cell lines. Compounds 2a, 2b, 3a and 12 showed potent activities with IC50 results comparable to that of doxorubicin.Conclusion:Docking investigations into Cyclin-dependent kinase 2 (CDK-2) enzyme, a potential target for cancer medication, were also reported showing the possible binding interaction into the enzyme active site to support their activity behavior.

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Thermal cyclocondensations of 3-N(4- and 5-benzimidazolyl and benztriazolyl)amino derivatives of 2-propenoic acid

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19872918 ◽

1987 ◽

Vol 52 (12) ◽

pp. 2918-2925 ◽

Cited By ~ 10

Author(s):

Viktor Milata ◽

Dušan Ilavský

Keyword(s):

Uv Spectra ◽

Propenoic Acid ◽

Amino Derivatives ◽

Derivatives Of ◽

C Nmr ◽

Ir And Uv Spectra

The cyclization of 3-N(4- and 5-benzimidazolyl and benztriazolyl)amino-2-cyano- and 2-ethoxycarbonyl-2-propenoate esters Ia, b-IVa, b under the conditions of the Gould-Jacobs reaction leads to angularly ring-fused substituted imidazo or triazolo[4,5-f] (V, VI) and [4,5-h] (VII, VIII) quinolines, respectively. The esters Vb-VIIIb have been transformed into the corresponding chloroderivatives Vc-VIIIc. 3-N(5-Benzimidazolyl and 5-benztriazolyl)amino-2-cyano-2-propenenitriles are cyclized in the presence of aluminium(III) chloride to give the aminoquinolines Vd, VId. The structure of the products has been characterized by their 1H, 13C NMR, IR, and UV spectra.

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Equilibrium and Kinetic Study of Anionic and Cationic Pollutants Remediation by Limestone–Chitosan–Alginate Nanocomposite from Aqueous Solution

Molecules ◽

10.3390/molecules26092586 ◽

2021 ◽

Vol 26 (9) ◽

pp. 2586

Author(s):

Inas A. Ahmed ◽

Ahmed H. Ragab ◽

Mohamed A. Habila ◽

Taghrid S. Alomar ◽

Enas H. Aljuhani

Keyword(s):

Physical Adsorption ◽

Low Cost ◽

Freundlich Isotherm ◽

Entropy Change ◽

Sem Images ◽

Bet Analysis ◽

Adsorption Processes ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Multilayer Formation

In this work, low-cost and readily available limestone was converted into nanolimestone chitosan and mixed with alginate powder and precipitate to form a triple nanocomposite, namely limestone—chitosan–alginate (NLS/Cs/Alg.), which was used as an adsorbent for the removal of brilliant green (BG) and Congo red (CR) dyes in aqueous solutions. The adsorption studies were conducted under varying parameters, including contact time, temperature, concentration, and pH. The NLS/Cs/Alg. was characterized by SEM, FTIR, BET, and TEM techniques. The SEM images revealed that the NLS/Cs/Alg. surface structure had interconnected pores, which could easily trap the pollutants. The BET analysis established the surface area to be 20.45 m2/g. The recorded maximum experimental adsorption capacities were 2250 and 2020 mg/g for CR and BG, respectively. The adsorption processes had a good fit to the kinetic pseudo second order, which suggests that the removal mechanism was controlled by physical adsorption. The CR and BG equilibrium data had a good fit for the Freundlich isotherm, suggesting that adsorption processes occurred on the heterogeneous surface with a multilayer formation on the NLS/Cs/Alg. at equilibrium. The enthalpy change (ΔH0) was 37.7 KJ mol−1 for CR and 8.71 KJ mol−1 for BG, while the entropy change (ΔS0) was 89.1 J K−1 mol−1 for CR and 79.1 J K−1 mol−1 BG, indicating that the adsorption process was endothermic and spontaneous in nature.

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