Showing papers by "Muhammad Kaleem Khosa published in 2020"

Degradation product distribution of Reactive Red-147 dye treated by UV/H2O2/TiO2 advanced oxidation process

Abstract: The presence of dyes in industrial effluents is of public health concern. A considerable attention was paid to remove the dyes from the aquatic environment. This study focusses on the degradation of reactive red (RR-147) dye under UV irradiation in the presence of hydrogen peroxide (H2O2) and nano photo catalyst (TiO2). Effect of different parameters like dye concentration, pH, H2O2, UV irradiation time and TiO2 was studied. The maximum degradation of 92% for 50 ppm dye concentration, pH 3.4, H2O2 0.9 mL, TiO2 0.6 g and UV irradiation time 60 min was observed. The UV/Vis spectrophotometer was used to investigate the change in absorbance after UV irradiation. The 57 % reduction in COD was achieved when the dye aqueous solution was exposed to UV/H2O2/TiO2 process under optimized conditions. The FTIR was used for the identification of degraded product after UV irradiation treatment. The FTIR study showed that most of the functional group peaks were disappeared after the UV/H2O2/TiO2 treatment. LCMS/GCMS analyses scrutinized the intermediates and a mechanistic degradation pathway has also been proposed. The cytotoxicity of the irradiated dye samples was assessed using hemolytic test while mutagenic evaluation was carried out using the Ames test before and after treatment. The UV/H2O2/TiO2 is proved to be more capable and efficient system for the degradation of the RR-147 dye as compared to UV/H2O2 alone.

Microwave Assisted Appraisal of Neem Bark Based Tannin Natural Dye and its Application onto Bio-mordanted Cotton Fabric

Abstract: The current study is aimed to utilize the microwave for isolation of colorant from neem bark and its application onto chemical & bio-mordanted cotton fabric. For the purpose, aqueous, acid and organic media have been employed to isolate the colorant and to make its application onto surface modified and bio-mordanted cotton fabric followed by microwave treatment up to 6min. It is found that using optimum extraction and dyeing conditions, acceptable fastness properties have been rated when 9% of Al & Fe, 7% of tannic acid as pre chemical, 7% of acacia, 9% of henna, 7% of pomegranate & 5% of turmeric extract as pre bio mordants. Similarly, 5% of Al, 9% of T.A, 7% of pomegranate, and turmeric extract as post-mordants have been employed. It is recommended that isolation of colorant & dyeing under MW treatment has not only improved the natural dyeing process but also the addition of herbal-based bio-mordants have made the dyeing process more sustainable & ayurvedic. So it is concluded that microwave treatment has not only explored the coloring potential of neem bark but also made possible use of bio-mordants for making process more green with excellent color characteristics under reduced optimal conditions.

Hydro-thermal synthesis and crystal structure of poly[bis-(μ3-3,4-di-amino-benzoato)manganese], a layered coordination polymer.

Abstract: The hydro­thermal synthesis and crystal structure of the title two-dimensional coordination polymer, poly[bis­(μ3-3,4-di­amino­benzoato-κ3N3,O,O′)manganese(II)], [Mn(C7H7N2O2)2]n, are described. The Mn2+ cation (site symmetry \overline{1}) adopts a tetra­gonally elongated trans-MnN2O4 octa­hedral coordination geometry and the μ3-N,O,O′ ligand (bonding from both carboxyl­ate O atoms and the meta-N atom) links the metal ions into infinite (10\overline{1}) layers. The packing is consolidated by intra-layer N—H⋯O and inter-layer N—H⋯N hydrogen bonds. The structure of the title compound is compared with other complexes containing the C7H7N2O2− anion and those of the related M(C8H8NO2)2 (M = Mn, Co, Ni, Zn) family, where C8H8NO2− is the 3-amino-4-methyl­benzoate anion.