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Assessment of antibacterial cellulose nanocomposites for water permeability and salt rejection
Sher Bahadar Khan,Khalid A. Alamry,Elham N. Bifari,Abdullah M. Asiri,Muhammad Yasir,Lassaad Gzara,Rehan Zulfiqar Ahmad 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Anti-bacterial nanocomposites (NC1–NC4) based on cellulose acetate were prepared by dispersing ZnO nanofillers in the cellulose acetate matrix. Anti-bacterial nanocomposites were structurally and morphological examined by XRD (X-ray powder diffraction), FESEM (field emission scanning electron microscopy), and FT-IR (Fourier transform infrared) spectroscopy. All the spectroscopic techniques suggested that nanocomposites are successfully synthesized. All the nanocomposites showed antibacterial activity which increased as a function of zinc oxide. Further the selectivity of anti-bacterial nanocomposites was investigated toward different metal ions, including Zn2+, Cd2+, Pb2+, Mn2+, Ni2+, Fe2+, Al3+, Sb3+, and Sr3+. The selectivity data suggests that nanocomposites are more selective toward Fe2+. NC1 displayed highest uptake aptitude for Fe2+ with highest distribution coefficient of 7549.123 mL g1. Therefore, NC1 was subjected to water permeability to explore the role of antibacterial nanocomposite as membrane for water purification. The results suggest that these materials are possibly appropriate for water treatments.
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.
Mohammed M. Rahman,M.M. Alam,Khalid A. Alamry 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
In this approach, the wet-chemical (co-precipitation) technique was used to prepare the cadmium oxide(CdO) nanoparticles (NPs) decorated with multi-walled carbon nanotubes (CNT) at low temperature. Thepowder XDR, UV–vis, TEM, XPS, and FTIR spectroscopy were used for detail characterization of thesynthesized CdO/CNT nanocomposite (NCs). A thin layer of CdO/CNT NCs was deposited onto a glassycarbon electrode (GCE) with conducting coating binder to obtain a chemical sensor which wassubsequently used to detect m-tolyl hydrazine hydrochloride (m-THyd) in buffer medium byelectrochemical approach for environmental safety. The proposed m-THyd chemical sensor exhibitedlong-term stability, good selectivity, broad linear dynamic range, lower detection limit, and enhancedelectrochemical response. The calibration curve of the current vs concentration of m-THyd was found tobe linear (r2 = 0.9903) over the linear dynamic range (LDR) of 0.01 nM to 0.1 mM. The sensitivity(25.7911 mA mM cm 2) of chemical sensor was calculated from the slope of calibration curve and surfacearea of GCE (0.0316 cm2) and the detection limit (4.0 0.2 pM) was estimated from the signal to noiseratio at 3. These preliminary results suggest that the newly developed CdO/CNT NCs nanocompositecould be promising electrochemical sensors for the detection of hazardous toxins to clean theenvironment in broad scales.
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.
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.