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- Title
Adsorption of Crystal violet dye from synthetic textile effluents by utilizing wheat bran (Triticum aestivum).
- Authors
Haq, Hafiza Amna; Javed, Tariq; Abid, Muhammad Amin; Zafar, Shagufta; Din, Muhammad Imran
- Abstract
The present investigation reports the decolorization and subtraction of harmful Crystal violet (basic) dye from the aqueous solution by adsorption on wheat bran (WB). Experiments are performed by monitoring various factors, for instance, granular size of adsorbent (105, 210 and 500 mesh sizes), pH (1-11), duration of contact (5-120 min), amount of wheat bran (0.1-1.0 g), initial dye concentration (300-550 ppm) and temperature (0°C-60°C). The surface study of wheat bran was investigated by Fourier-transform infrared spectroscopy and scanning electron micrograph. The calculations reveal adsorption of Crystal violet (CV) at the surface of WB is directly proportional to exposure time, amount of WB, initial dye concentration and temperature. Three isotherm equations were applied, Freundlich, Langmuir and Dubinin-Radushkevich isotherms, to explore experimental data. The computations indicate that data fits efficiently with the Langmuir model. Optimum uptake capacity was calculated, that is, 116.6 mg g-1. Moreover, the adsorption data were used to calculate the rate constants of pseudo-first-order, pseudo-second-order, liquid film diffusion and intraparticle diffusion. The regression value (R² = 1) was obtained to confirm the good correlation with pseudo-second-order kinetic equation rather than others observed kinetic equations. To figure out the nature of adsorption, the free energy of adsorption of CV on WB (ΔG), enthalpy (ΔH) and entropy (ΔS) were determined. The numerical results of ΔG, ΔH and ΔS show that adsorption of CV on WB was feasible, spontaneous and endothermic in nature. The maximum removal efficiency of wheat bran towards Crystal violet, that is, 86.57% is observed at optimum conditions, that is, pH 2, 0.6 g of WB, 30 min of contact time and 400 ppm of initial dye concentration. It can be concluded from the experimental results that WB could be effectively employed as a biosorbent for the removal of CV.
- Subjects
GENTIAN violet; WHEAT bran; WHEAT; SYNTHETIC textiles; ADSORPTION (Chemistry); LANGMUIR isotherms
- Publication
Desalination & Water Treatment, 2021, Vol 224, p395
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.27178