Production and purification of bioflocculants from newly isolated bacterial species: a comparative decolourization study of cationic and anionic textile dyes

Saha, Souvik; Shukla, Sushil Kumar; Singh, Hare Ram; Pradhan, Kishanta Kumar; Jha, Santosh Kumar

doi:10.1080/09593330.2020.1737737

Cited by 16 publications

(4 citation statements)

References 50 publications

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“…This phenomenon could be explained by the effect of solution pH on the surface charge of the functional groups of the bioflocculant. The relative concentration of positively charged groups on the bioflocculant surface is increased by the higher concentration of H + ions under more acidic conditions, and it is possibly having a favorable effect on the decolorization of anionic dyes 21 …”

Section: Resultsmentioning

confidence: 99%

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Uncovering the flocculating and dye recovery potential of pH‐responsive bioflocculant produced by Bacillus thuringiensis

Zhong,

Wu,

et al. 2023

Env Prog and Sustain Energy

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In this study, the decolorization of anionic dyes was investigated using a novel pH‐responsive bioflocculant (named BF‐TWB10) derived by Bacillus thuringiensis. The BF‐TWB10 showed a dye removal capacity of 99.06% for C.I. Direct Red 224 (DR 224) and 99.22% for C.I. Acid Black 172 (AB 172) at pH 2.0. Its dye removal capacity decreased with increasing pH and the zeta potential analysis revealed that the dye particles exhibited stronger dispersion forces at higher pH levels. Owing to this pH‐responsive property, BF‐TWB10 could be utilized to recover anionic dyes. The recovery rate was 83.46% for DR 224 and 76.46% for AB 172. We then attempted to concentrate the regenerated dye solutions by regenerating the dye‐loaded floc in one‐tenth of its original volume. The concentration multiple of the regenerated dye solutions reached 8.220 and 7.758 times for DR 224 and AB 172, respectively. In addition, the recovery rate of both dyes increased after three cycles of decolorization/regeneration. The results suggested that BF‐TWB10 has potential not only to remediate dyes from textile effluent but also to recover dyestuffs.

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Section: Resultsmentioning

confidence: 99%

“…The relative concentration of positively charged groups on the bioflocculant surface is increased by the higher concentration of H + ions under more acidic conditions, and it is possibly having a favorable effect on the decolorization of anionic dyes. 21…”

Section: Effect Of Ph Value On Decolorization Efficiencymentioning

confidence: 99%

Uncovering the flocculating and dye recovery potential of pH‐responsive bioflocculant produced by Bacillus thuringiensis

Zhong,

Wu,

et al. 2023

Env Prog and Sustain Energy

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“…Likewise, research by Shimofuruya et al reported that bioflocculant from Streptomyces griseus showed high flocculating activity at the pH range of 2–6, with a maximum at pH 4 [ 24 , 25 ]. This behavior may be related to the effect of solution pH on the aqueous chemistry and on the surface charge of bioflocculants [ 26 ]. At acidic pH, the higher H⁺ ions concentration increases the relative concentration of the positively charged groups on the bioflocculant surface, which has been observed to enhance the decolorization of negatively charged dyes, such as EBT [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…This behavior may be related to the effect of solution pH on the aqueous chemistry and on the surface charge of bioflocculants [ 26 ]. At acidic pH, the higher H⁺ ions concentration increases the relative concentration of the positively charged groups on the bioflocculant surface, which has been observed to enhance the decolorization of negatively charged dyes, such as EBT [ 26 ]. Indeed, it has been already observed for EBT that lowering pH results in higher dye flocculation, as the adsorption of the anionic dye on the positively charged surface of the biomaterial is favored [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

Bioflocculants Produced by Bacterial Strains Isolated from Palm Oil Mill Effluent for Application in the Removal of Eriochrome Black T Dye from Water

et al. 2020

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Four strains of bioflocculant-producing bacteria were isolated from a palm oil mill effluent (POME). The four bacterial strains were identified as Pseudomonas alcaliphila (B1), Pseudomonas oleovorans (B2), Pseudomonas chengduensis (B3), and Bacillus nitratireducens (B4) by molecular identification. Among the four bacterial strains, Bacillus nitratireducens (B4) achieved the highest flocculating activity (49.15%) towards kaolin clay suspension after eight hours of cultivation time and was selected for further studies. The optimum conditions for Eriochrome Black T (EBT) flocculation regarding initial pH, type of cation, and B4 dosage were determined to be pH 2, Ca2⁺ cations, and a dosage of 250 mL/L of nutrient broth containing B4. Under these conditions, above 90% of EBT dye removal was attained. Fourier transform infrared spectroscopic (FT-IR) analysis of the bioflocculant revealed the presence of hydroxyl, alkyl, carboxyl, and amino groups. This bioflocculant was demonstrated to possess a good flocculating activity, being a promissory, low-cost, harmless, and environmentally friendly alternative for the treatment of effluents contaminated with dyes.

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Ecofriendly synthesis of selenium nanoparticles using agricultural Citrus fortunella waste and decolourization of crystal violet from aqueous solution

Solmaz,

Turna,

Baran

2024

Can J Chem Eng

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In this study, the reuse of Citrus fortunella (CF) plant waste, an agricultural product, was evaluated within the scope of sustainability. In this context, selenium nanoparticles (CF‐Se NPs) were synthesized from CF waste extracts and crystal violet (CV) dye was removed. The characteristic structure of the synthesized CF‐Se NPs was determined by X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X‐ray (EDX), Fourier transform infrared spectroscopy (FTIR), UV–vis spectroscopy, and point of zero charge (pHpzc). Batch adsorption tests were applied to determine the effect of the synthesized CF‐Se NPs on CV removal. Four different kinetic and isotherm models were examined using error analysis functions. While the particle size of CF‐Se NPs was determined as 27.58 nm, the pHpzc value was calculated as 9.40, the average surface charge distribution was −24.1 mV, and mass losses were 9.03% and 13.42% at 334.99 and 739.21°C, respectively. The most suitable kinetic and isotherm model for CV removal with CF‐Se NPs was determined to be pseudo‐second‐order with a R2‐value of 0.999 and Freundlich with R2‐value of 0.993, and the qmax was calculated as 23.55 mgCV/gCF‐SeNPs. The effectiveness of CF‐Se NPs synthesized from waste in CV removal is a remarkable issue in terms of sustainable production.

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Production and purification of bioflocculants from newly isolated bacterial species: a comparative decolourization study of cationic and anionic textile dyes

Cited by 16 publications

References 50 publications

Uncovering the flocculating and dye recovery potential of pH‐responsive bioflocculant produced by Bacillus thuringiensis

Uncovering the flocculating and dye recovery potential of pH‐responsive bioflocculant produced by Bacillus thuringiensis

Bioflocculants Produced by Bacterial Strains Isolated from Palm Oil Mill Effluent for Application in the Removal of Eriochrome Black T Dye from Water

Ecofriendly synthesis of selenium nanoparticles using agricultural Citrus fortunella waste and decolourization of crystal violet from aqueous solution

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