K M Anis Ul Haque

Research shows that the composite material is used as an adsorbent to remove pollutants from wastewater. This work is aimed at producing a novel composite film comprising chitosan, polyvinyl alcohol, and cornstarch incorporating nanocellulose (CPCN). The composite film was prepared by a blending method wherein nanocellulose was extracted using a chemical method from banana bract. The prepared CPCN was characterized using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) with EDX to understand their molecular interaction and surface morphology, respectively. The effect of parameters including pH, adsorbent dosage, initial dye concentration, and contact time on the adsorption of methylene blue (MB) dye was studied. The maximum adsorption was found to be up to 63.13 mg/g MB with a pH of 10, adsorbent dosage of 2 g, an initial concentration of 150 ppm, and contact time of 120 min at room temperature (25°C) indicating a moderate adsorption capacity of ...

The elimination of textile dye from wastewater is an ecological and environmental barrier to continued industrial expansion. The current study aims to analyse the anionic methyl blue (MB) dye's ability to bind to the Artocarpus heterophyllus leaf powder (AHLP) and assess its capacity to eliminate the dye from an aqueous solution. The Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), X-ray diffraction (XRD), and zero-point charge (pHzpc) analyses were utilised to characterise the leaf powder (adsorbent). The adsorption efficiency was evaluated through various conditions, including solution pH (3-10), dye concentration (20-50 mg.L-1), AHLP dosage (1.50-8.0 g.L-1), contact time (0-90 min), and temperature (300-323 K). The maximum dye adsorption efficiency (91.10%) was achieved within 45 min, using 3.0 g.L-1 adsorbent dose in 20 mg.L-1 MB solution at pH 4.0 and 300 K temperature. The adsorption mechanism was congruent with the pseudo-second-order m...

The bacterial isolate Bacillus sp. AZ28, obtained from industrial effluent, demonstrates a great capacity to degrade various azo dyes (methyl orange (MO), magneson I (MI), novacron dark blue (NDB), and novacron red FN 3GF (NRF3)), and azo dye-containing textile effluent (TE). The degradation was evident by decolorization of dyes, and the decolorization efficiency of 84-95% was achieved within 14-72 h under optimum conditions, such as 37˚C, pH 7, inoculation size 8%, 1% glucose, and 1% beef extract. The extent of decolorization of individual dye was determined by UV–Vis spectroscopy, and products of biodegradation were analyzed by FTIR spectroscopy and TLC analyses. Chemical analysis showed that the COD and BOD values were significantly reduced after treatment. Thus, the biodegradation ability under mild conditions suggests that Bacillus sp. AZ28 has potential in textile effluent treatment. J. Bangladesh Acad. Sci. 45(1); 117-122: June 2021

Antibacterial activity of Pd(bpy)(ONO2)2 complex (bpy = bipyridine) was studied by disc diffusion method against Escherichia coli, Staphylococcus aureus, Klebsiella oxytoca, Pseudomonas aeruginosa and Enterococcus faecalis. The compound was found to be active against the bacteria. DNA binding constant of that complex was studied with extracted DNA from lemon by UV-Vis spectroscopy. The calculated binding strength was found to be 2.09×10 6 which is significantly higher than that of the [Pd(bpy)(OH2)2] 2+ complex with CT-DNA.

The temperature dependency of the electrochemical analysis of acetyl ferrocene (AcFc) and iron(III) acetylacetonate ([Fe(acac)3]) has been investigated for non‐aqueous redox flow batteries (NARFBs). AcFc and [Fe(acac)3] were utilized as catholyte and anolyte species, respectively, in an electrochemical cell with a cell voltage of 1.41 V and Coulombic efficiencies >99% for up to 50 total cycles at room temperature (RT, 25 °C). Experiments with a rotating ring disk electrode (RRDE) indicate that the diffusion coefficient reduces with decreasing temperature from 25 °C to 0 °C, yet the overall storage capacity was higher than that of an aqueous redox flow battery (ARFBs). The electrochemical kinetic rate constant (k0) of AcFc was found to be greater than that of [Fe(acac)3]. However, the value of k0 was not affected by the variable temperature. 1H NMR investigations reveal that temperature change during battery trials did not occur in any structural modification. The obtained result ...