Abstract
ABSTRACT This work highlights the potential of corncob biochar (CCBC) and Brevibacillus parabrevis for the decolorization of brilliant green (BG) dye from synthetically prepared contaminated wastewater. The CCBC was characterized by proximate, Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and Brunauer–Emmett–Teller analysis, respectively. Different parameters affecting the adsorption process were evaluated. The experimental results were analyzed by the Langmuir and Freundlich isotherm models. Kinetic results were examined by different models; pseudo-second-order model has shown the best fit to the experimental data. Anew positive values of ΔHo (172.58 kJ/mol) and ΔSo (569.97 J/K/mol) in the temperature range of 303–318 K revealed that the adsorption process was spontaneous and endothermic. The present investigation showed that the bacteria immobilized with CCBC showed better BG dye degradation. The kinetic parameters, μmax, Ks, and μ max, were found to be 0.5 per day, 39.4 mg/day, and 0.012 L/mg/day using Monod model, respectively. The adsorbent with bacteria showed good potential for the removal of cationic BG dye and can be considered for the remediation of industrial effluent.
Highlights
Pollution due to rapid population growth and indus trial development has largely contributed to the dete rioration of water quality [1]
On comparing the Fourier-transform infrared spectroscopy (FTIR) spectra analysis of the corn cob before and after Brilliant green (BG) dye adsorption, it was clear that the large number of functional groups present on the corncob surface facilitated BG dye adsorption
Micrographic images of corncob biochar (CCBC) obtained from scanning electron microscope (SEM) before and after adsorption BG dye adsorption have been displayed in Figure 1a and b, c, respectively
Summary
Pollution due to rapid population growth and indus trial development has largely contributed to the dete rioration of water quality [1]. The colored water reduces sunlight penetration in water bodies, lowers its photosynthetic activities, causes eutrophication, oxygen deficiency, and disturbs the entire aquatic balance [12,13] Dyes and their intermediate pro ducts adversely affect the health of human beings due to its carcinogenic, cytotoxic, mutagenic, and immune suppression effects [14]. Many physical–chemical methods such as ozo nation [18], electro-flotation [19], electro-oxidation [20], nano-filtration membrane [21], reverse osmo sis [22], coagulation-flocculation [23], ionexchange [13], and adsorption [24,25] have been used for treating dye containing wastewaters These technologies have some drawbacks: (i) complex operating procedures, (ii) intensive energy requirement, (iii) high operational cost, and (iv) production of secondary wastes [26,27,28]. The perfor mance of the reactors was compared under free cell and immobilized cell condition and the reactors pro cess parameters were optimized
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