Tariq Mahmud

ISOTHERMAL AND THERMODYNAMICAL MODELING OF CHROMIUM (III) ADSORPTION BY COMPOSITES OF POLYANILINE WITH RICE HUSK AND SAW DUST

The adsorption of Cr (III) from water by polyaniline composites with rice husk and saw dust of Eucalyptus camaldulensis has been investigated in this study. The surface of adsorbents was characterized by FT-IR. Effect of various operational conditions like agitation time, initial pH, adsorbent dose, particle size of composites and temperature were studied in batch mode. The suitability of the data was confirmed by Langmuir and Freundlich isotherms. Thermodynamic studies showed that adsorption of Cr (III) on these composites occur spontaneously. Rice husk and saw dust modified the morphology of polyaniline by preventing its aggregation and improving its adsorption capacity.

Sorptive removal of lead (II) from water using chemically modified mulch of Madhuca longifolia and Polyalthia longifolia as novel biosorbents

Abstract In this study, dried leaves (mulch) of Madhuca longifolia and Polyalthia longifolia have been used for removing Pb(II) from aqueous media. Their biosorption capacities were enhanced by chemical treatment using dipping methodology. It is found that formalin modified M. longifolia leaves and acetone modified P. longifolia leaves have greater biosorption capacity as compared to non-modified leaves. After optimizing operational parameters, Langmuir, Freundlich, and Temkin isotherms were applied to equilibrium data for determining maximum biosorption capacities, heat of biosorption, and biosorption intensities. The maximum biosorption capacity “q m” values were 17.18, 25.77, 14.11, 4.50, 8.99, and 6.99 mg/g using simple M. longifolia leaves, base modified M. longifolia leaves, formalin modified M. longifolia leaves, simple P. longifolia leaves, base modified P. longifolia leaves, and acetone modified P. longifolia leaves correspondingly. Thermodynamic revealed that biosorption using these biosorbents ...

Brilliant Green Dye Elimination from Water Using Psidium guajava Leaves and Solanum tuberosum Peels as Adsorbents in Environmentally Benign Way

The aim of this study is to check the feasibility of Psidium guajava (Guava) leaves and peels of Solanum tuberosum (Potato) as biosorbents in removal of Brilliant Green (BG) in batch mode. Surface analysis of biosorbents was done by FT-IR and quantitatively analyzed by Boehm titration. The removal of dye was confirmed by UV-VIS spectroscopy. Isothermal modeling was studied by using Langmuir, Freundlich, and Temkin isotherms. Various isothermal parameters for adsorption of Brilliant Green such as  mg/g, 1.173 mg/g , and −2.397 KJ/mol were noted for Solanum tuberosum peels (PP) and Psidium guajava leaves (GL), respectively. Similarly pH, moisture content, and various metals were quantitatively analyzed. Results showed that leaves of Psidium guajava were more effective for removal of Brilliant Green.

Synthesis, Characterization and Magnetic Studies of Dysprosium Complex, [Dy2(TEA)2(O2CPh)4·2H2O]

AbstractA dysprosium complex, [Dy2 (TEA)2(O2CPh)4·2H2O] has been synthesized using TEA (tri-ethanolamine) and benzoic acid. The obtained complex is a dimer in which both of the TEA is linked with two dysprosium ions through the protonated oxygen atoms and the resultant molecule is Centro symmetric. The nature of bonding and structure of the synthesized dimer was explored from infrared, magnetic studies and single crystal X-ray crystallographic technique. The crystal structure of the complex has triclinic crystal system and P-1 space group. Unit cell parameters are: a = 10.0931(4) Å, b = 10.8841(5) Å, c = 10.9441(5) Å, and α = 73.915(2)°, β = 74.833(2)°, γ = 67.764(2)°, V = 1052.54(8) Å3, Dx = 1.801 Mg/m3 and Mr = 1141.84. The complex possesses small value of coercivity which indicates that it is a soft ferromagnetic material and can resist with external magnetic field without becoming demagnetized.Graphical Abstract A dysprosium complex was synthesized from tri-ethanolamine and benzoic acid and was characterized through various physical techniques such as infrared, magnetic studies and single crystal X-ray crystallography. Small value of coercivity indicates that it is a soft ferromagnetic material and can resist with external magnetic field without becoming demagnetized.

Synthesis, characterization and antiurease activities of a novel Mannich base 1-[(4-methoxyphenyl)(2-methylidenecyclohexyl)methyl]pyrrolidine (MMP) and its complexes with Cu (II), Ni (II), Co (II) and Fe (II) ions

ABSTRACT Mannich base 1-[(4-methoxyphenyl)(2-methylidenecyclohexyl)methyl]pyrrolidine (MMP) was synthesized by condensing cyclohexanone, 4-methoxybenzaldehyde, and pyrrolidine together using ethanol as solvent. The synthesized ligand was further made to react with CuCl2, NiCl2, CoCl2, and FeCl2 to afford their respective complexes. Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR), carbon thirteen nuclear magnetic resonance (13C NMR), thermogravimetric analysis (TGA), and mass spectrometry (MS) were used to characterize the ligand and its complexes. The proposed geometries of the complexes were established on the basis of metal–ligand ratio through atomic absorption spectroscopy (AAS). The synthesized compounds were analyzed for their antiurease potential. Mannich base showed moderate antiurease activity with an IC50 value of 224.83 ± 0.84 μM. Complexes with Ni (II) and Fe (II) exhibited potent antiurease activity (4.41 ± 0.003, 5.21 ± 0.003 μM, respectively) while the Co (II) complex showed excellent (46.52 ± 0.05 μM) antiurease activity and poor antiurease activity was shown by the Cu (II) complex (424.32 ± 0.96 μM) as compared with the standard thiourea (21.25 ± 0.15 μM). Docking studies of the ligand were also consistent with the experimental results.

Adsorptive removal of a textile cationic dye from water using tartaric acid modified Bassia longifolia dried leaf mulch

Adsorption of pollutants on chemically modified agro-waste materials is a suitable alternative of costly methodologies of wastewater treatment. In this work, the dried leaves of Bassia longifolia had been used for removing methylene blue (M.B) dye from textile effluent after chemically modifying them with tartaric acid. All the operational parameters of adsorption were optimised and employed for isothermal modeling of equilibrium data for determining the mechanism of dye removal from water. Correlation coefficient values of Langmuir and Freundlich isothermal linear relationships indicated that both chemisorption and physiosorption are involved in removing this cationic dye from water. Maximum adsorption capacity of tartaric acid modified Bassia longifolia leaves is 30.74 mg/g of the adsorbent. Spontaneity of this process is clear from negative values of ∆ G o and separation factor values, which are less than unity. These results suggested that tartaric acid modified Bassia longifolia leaves can be employed for wastewater treatment efficiently in an economical and benign way.

N-[4-(Phenyl­imino­meth­yl)phen­yl]acetamide 0.67-hydrate

The title compound, C15H14N2O·0.67H2O, was prepared by the reaction of 4-acetoaminebenzaldehyde and aniline. The asymmetric unit contains six organic molecules and four water molecules. The dihedral angles between the aromatic ring planes in each organic molecule vary from 42.4 (2) to 53.8 (2)°. In the crystal, an extensive network of intermolecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds link the molecules into [010] chains.

Bis(2-chloro-benz-yl)dimethyl-ammonium bromide.

In the title compound, C16H18Cl2N+·Br−, the dihedral angle between the aromatic ring planes is 57.73 (5)°. In the absence of any strong hydrogen bonds, the structure results from a large number of competing weaker interactions including Cl⋯Cl [3.4610 (5) Å] and C—H⋯Cl contacts and both (aryl) C—H⋯Br and N+—Csp 3—H⋯Br− cation–anion interactions.