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Anish Khan,Aftab Aslam Parwaz Khan,Abdullah M. Asiri,Malik Abdul Rub,Naved Azum,Sher Bahadar Khan,Hadi M. Marwani 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A new class hybrid poly(2-methoxy aniline) Sn(II)silicate carbon nanotubes composite was synthesized by sol–gel method. The physico-chemical characterization was carried out by Scanning Electron micrograph, X-ray Diffraction, Fourier Transform Infrared, Ultraviolet–Visible Spectroscopy and simultaneous Thermo Gravimetric Analysis. The ion-exchange studies were also carried out to understand the ion-exchange capabilities. The dc electrical conductivity studies reviles its highly conducting nature in the range of 2–3-2 S cm-1. On the basis of distribution studies it was found highly selective for Hg2+. Due to selectivity of the composite, ion selective membrane was prepared and employed it as an indicator electrode in potentiometric titrations.
Aftab Aslam Parwaz Khan,Anish Khan,Abdullah M. Asiri,Malik Abdul Rub 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this paper provides the mechanistic investigation of Mn(II)-catalyzed oxidative of biotin (BTN) has been studied by peroxomonosulphate (PMS) in alkaline medium at 293–308 K with a constant ionic strength. Such studies are much helpful in gaining an insight into the interaction of metal ions through the study of the mechanistic pathway of biotin in redox reactions. The stoichiometry of the reaction is 1:1 in the presence of catalyst. The reaction shows polymerization in the presence of acrylonitrile under the experimental conditions employed. Influence of dielectric constant and ionic strength of the medium on the reaction rate have been done. Manganese peroxide was proposed as the intermediate to explain the experimental observations. Temperature effect is noticeable in all these reactions and activation parameters have been determined. The effect of temperature was evaluated by Arrhenius equation and transition state theory, a mechanism was proposed based on the observation of the experimental results. It involves the formation of an activated complex, which decomposes to give the product. It is identified with the help of FTIR and TLC.
Aftab Aslam Parwaz Khan,Abdullah M. Asiri,Anish Khan,Naved Azum,Malik Abdul Rub,Mohammed M. Rahman,Sher Bahadar Khan,K. S. Siddiqi,Khalid A. Alamry 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
The reactions of Cefuroxime (CFA) by hexacyanoferrate (III) (HCF(III)) in alkaline medium at a constant ionic strength has been studied spectrophotometrically. It is a first order reaction, but fractional order in both CFA and alkali. Decrease in dielectric constant of the medium decreases the rate of reaction. The effect of added products and ionic strength has also been investigated. A mechanism involving free radicals is proposed. In a composite equilibrium step, CFA binds to HCF(III) to form a complex that subsequently decomposes to the products. The main two products were separated and identified by column chromatography, TLC and FT-IR. There is good agreement between the observed and calculated rate constants under different experimental conditions. The reaction was studied at different temperatures and activation parameters were computed with respect to the slow step of the proposed mechanism.
Mohammed M. Rahman,Sher Bahadar Khan,Hadi M. Marwani,Abdullah M. Asiri,Khalid A. Alamry,Malik Abdul Rub,Anish Khan,Aftab Aslam Parwaz Khan,Naved Azum 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this report, the doped ZnO-CdO nanoblocks (NBs) have been synthesized by facile wet-chemical technique at low-temperature and characterized by UV–vis, FT-IR, XRD, FESEM, XPS, XEDS, etc. The NBs were applied for the selective detection of Fe(III) ions and photo-catalytic degradation using Brilliant cresol blue (BCB). The analytical efficiency of NBs phase was also investigated for a selective detection of Fe(III) by ICP-OES. NBs were found to be the most selective toward Fe(III), where adsorption process was mainly monolayer on a homogeneous adsorbent surface. In photo-catalysis, almost 52.3% degradation with BCB dye was observed under solar sources with NBs.
Low dimensional Ni-ZnO nanoparticles as marker of toxic lead ions for environmental remediation
Mohammed M. Rahman,Sher Bahadar Khan,Hadi M. Marwani,Abdullah M. Asiri,Khalid A. Alamry,Malik Abdul Rub,Anish Khan,Aftab Aslam Parwaz Khan,Abdullah H. Qusti 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
We have synthesized Ni-ZnO nanoparticles (NPs) by a wet-chemical route using reducing agents. Thestructural and optical properties of Ni-ZnO NPs were investigated by various conventional methods. Theanalytical potential of the Ni-ZnO NPs was studied for a selective detection of toxic Pb(II) ion usingrecognized ICP-OES method for environmental remediation. Data obtained from the selectivity studyindicated that the selectivity of Ni-ZnO NPs phase was the most toward Pb(II) ion. However, theadsorption isotherm data of Pb(II) on Ni-ZnO NPs phase was good-match with the Langmuir-Adsorption-Isotherm, strongly supporting that the adsorption process was mainly monolayer on homogeneousadsorbent surfaces.
Malik Abdul Rub,Abdullah M. Asiri,Naved Azum,Anish Khan,Aftab Aslam Parwaz Khan,Sher Bahadar Khan,Mohammed M. Rahman,Kabir-ud-Din 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Herein we report the micellization and cloud point of an amitriptyline hydrochloride (AMT) under the influence of cationic, anionic and nonionic hydrotropes. Anionic hydrotropes were employed to know the micellar and surface behaviors, besides studying the clouding behavior of AMT drug with cationic,anionic and nonionic hydrotropes. Tensiometric study has been performed and the properties studied include the critical micelle concentration (cmc), maximum surface excess at the air/water interface (Gmax), the minimum area per of amphiphilic molecule at air/water interface (Amin), and the different thermodynamic parameters, besides clouding phenomenon. Interaction parameters of micelles (bm) and monolayer (bs) indicate that drug-hydrotrope systems show better interaction at the interface than in micelles.
Effect of low levels of hydrotropes on micellization of phenothiazine drug
Sulaiman Y. M. Alfaifi,Dileep Kumar,Malik Abdul Rub,Farah Khan,Naved Azum,Anish Khan,Abdullah M. Asiri,Hurija Džudžević-Čančar 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.2
Interactions within mixtures of the phenothiazine drug promethazine hydrochloride (PMH) and cationic hydrotropes ortho-toluidine hydrochloride (o-TDH) and para-toluidine hydrochloride (p-TDH) were investigated at different ratios and temperatures via conductometry to understand various physicochemical properties. Critical micelle concentration (cmc) was less than values of cmcid (cmc in ideal mixed system), indicating significant interaction among the studied constituents in solution mixtures. The cmc of pure PMH was also determined by measuring the surface tension for comparison. A variety of micellization thermodynamic parameters (Gibbs free energy [Gm 0 ], change in standard enthalpy [Hm 0 ], and change in entropy [Sm 0 ]) were computed using conductometry. The micellar mole fraction (X1 Rb, X1 Rod, and X1 id) of hydrotropes estimated by various theoretical models (Rubingh, Rodenas, and Motomura) was assessed, and the results showed a greater contribution of hydrotropes in mixed micelles along with their values increasing via an increase in mole fraction (1) of hydrotropes (o-TDH/p-TDH). Negative values suggest extremely favorable attractive interaction/synergism, as declines occurred in the whole quantity of amphiphile used for the desired purpose, leading to a drop of expenditure along with ecological concern. Obtained activity coefficients (f1 and f2) were always beneath unity, meaning nonideality was found between PMH and o-TDH/p-TDH. Like the conductivity method, the UV-visible and FT-IR techniques also demonstrate the interaction between the PMH and o-TDH/p-TDH.