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1

Enhanced removal of golden XGL dye by clay composites: batch and column studies

100%
Nausheen S., Bhatti H. N., Hanif M. A., Ur-Rehman K.
Polish Journal of Environmental Studies
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2017
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tom 26
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nr 5
The adsorption potential of native clay and clay composites was investigated for Golden XGL dye removal from aqueous solution in batch and fixed-bed column modes. Morphological structure and functional groups of the adsorbent were determined by Fourier transform infrared spectroscopy analysis. In batch adsorption studies maximum adsorption capacity was determined by optimization of operational parameters, i.e., pH, adsorbent dose, contact time, initial dye concentration, and temperature. The effects of initial dye concentration, adsorbent bed height, and influent flow rate on fixed-bed column adsorption breakthrough curves were also evaluated. The obtained data was analyzed by the application of different equilibrium and kinetic models. Adsorption of Golden XGL dye onto native clay and clay composites was spontaneous, exothermic, and had great affinity between the adsorbate and adsorbent. The findings of this study revealed that clay composites are a potential adsorbent for cationic dye pollution remediation.
2

The dyeing process and the environment: enhanced dye fixation on cellulosic fabric using newly synthesized reactive dye

88%
Siddiqua U. H., Ali S., Hussain T., Bhatti H. N., Asghar M.
Polish Journal of Environmental Studies
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2017
|
tom 26
|
nr 5
New types of dyestuff moieties are being introduced to get the ease in imparting color to various substrates and sorting out the ways to improve the quality of dyed fabric using environmentally friendly techniques. To contribute to this research effort, the present study was carried for dyeing cellulosic fabric using novel bi-functional reactive dye. The synthesized dye contained sulphatovinylsulfone and monochlorotriazine functionality. The important influencing parameters for the exhaust method, e.g., dyeing temperature, concentration of salt, and alkali were optimized and their interaction was studied using central composite design. The results indicated that 61.5ºC was found to be suitable for the maximum exhaustion and fixation of the dye on cotton fabric. The optimum concentration of salt (30.01 g/L) and alkali (22.32 g/L) for dye experimentally resulted in 84.98 (±3)% of exhaustion and 79.00 (±3)% fixation on cellulose fabric. Fastness properties were good-to-excellent for the novel reactive dye applied on cotton fabric. A comparison of the results with the commercial reactive dye showed that attained results were within a practical range suitable for commercial dyeing.
3

Removal of actacid orange-RL dye using biocomposites: modeling studies

88%
Noreen S., Bhatti H. N., Zuber M., Zahid M., Asgher M.
Polish Journal of Environmental Studies
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2017
|
tom 26
|
nr 5
Textile industry wastewater plays an important role in environmental pollution. In the present study, the removal of actacid orange-RL (AO-RL) dye was carried out in batch mode with biocomposites. The optimum pH, biosorbent dose, equilibrium time, initial dye concentration, and temperature for maximum dye adsorption were recorded in the range of 3-6, 0.05 g, 60 min and 125-150 mg/L and 30ºC, respectively. Langmuir and Freundlich biosorption isotherms showed the satisfactorily fitness on equilibrium biosorption data, whereas the pseudo first-order and pseudo second-order both showed the satisfactorily fitness on biosorption kinetic data. The characterization of efficient biosorbents was carried out using FT-IR and SEM techniques, which revealed a significant change in biocomposite as a result of dye adsorption. Based on results, we can conclude that the biocomposite could be an efficient adsorbent for the adsorption of dyes from textile wastewater.
4

Redox mediators assisted-degradation of direct yellow 4

64%
Nouren S., Bhatti H. N., Iqbal M., Bibi I., Nazar N., Iqbat D. N., Kanwal Q., Kausar A., Hussain F.
Polish Journal of Environmental Studies
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2017
|
tom 26
|
nr 6
Direct yellow 4 degradation was investigated in the presence of various mediators (p-coumaric acid, 1, hydroxybenzotriazole (HOBT), syringaldehyde, vanillin, syringic acid, veratryl alcohol, and pyrocatechol) at pre-optimized conditions of process variables, i.e., pH 5.0, temperature 50ºC, enzyme dose 24 U/mL, and 0.25 mM H₂O₂ concentration. Citrus limon peroxidase (CL-POD) was used for degradation of DY4 dye. In the absence of mediators, the DY4 degradation was 60%, whereas mediators enhanced the POD biodegradation efficiency up to 87%. Among mediators investigated, syringaldehyde showed promising efficiency. We investigated yringaldehyde concentrations in the range of 0.0125-0.5 mM, and 0.025 mM was optimum for maximum dye degradation, which revealed that mediators could be used to enhance the biodegradation of dyes.
5

Sweet lime-mediated decolorization of textile industry effluen

51%
Nouren S., Sarwar M., Muhi-ud-Din G., Yameen M., Bhatti H. N., Soomro G. A., Suleman N., Bibi I., Kausar A., Nazir A., Iqbal M.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 1
This study looks at using partially purified peroxidase extracted from peels of sweet lime (Citrus limetta) for decolorizing textile industry effluent. The ideal pH and thermal conditions of the enzyme were 7 and 35ºC. The Km and Vmax for guaiacol were 0.66 mM and 6666 μmol/mL/min, respectively. We found that sweet lime peroxidase was very effective in decolorizing textile industry effluent. Almost complete decolorization (>99 %) of effluent was attained at a pH of 5.0, temperature of 55ºC, H₂O₂ concentration of 2 mM, and enzyme dose of 40 U/mL within 60 minutes of incubation. The effluent was also analysed in terms of physicochemical parameters before and after treatment with sweet lime peroxidase. The reduction in toxicity after the enzymatic treatment was evidenced by chemical oxygen demand (COD) and total suspended solids (TSS) values.
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