Presentation Information
[P02-217]Biosorption of reactive black 5 by Bacillus cereus S-2-3, response surface optimization, kinetic, isotherm and thermodynamics studies
○Faggo Abdullahi Adamu1, Mohd Yunus Bin Shukor2 (1. Sa'adu Zungur University Gadau (Nigeria), 2. Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, University Putra Malaysia (Malaysia))
Keywords:
Wastewater,Bacillus,biosorption,RB5,RSM,kinetic and isotherms,Thermodynamics
[Dyes have been used by textile, printing and other industries as a coloring agent for many years. These dyes cause water pollution, which continue to be a source of concern globally. Several physicochemical methods were employed for the treatment of dye-polluted water, but were inefficient, expensive and time consuming. Biosorption is currently being used for the treatment of dyes, nevertheless, the choice of most efficient biosorbent remains the major challenge. This study was aimed at determining the potential of bacterial isolates for the removal of reactive black 5 in aqueous solution.]
[The best isolate was physically and chemically modified with subsequent immobilization using sodium alginate. Optimizations (OFAT and placket Burman design (PBD), RSM), Kinetic, isotherm and characterization (FTTIR and XRD) studies subsequently followed.]
[The results revealed that out of the isolates screened, Bacillus cereus S-2-3 was the best candidate, with 50% adsorption efficiency. Out of the four chemical modifications used (H2SO4, HCL, Acetic acid and NaOH), HCL-modified and heat-treated Bacillus cereus S-2-3 exhibited the highest biosorption efficiency. Different factors were selected based on the OFAT results for PBD screening which gave 3 significant factors (pH, adsorbent dosage and dye concentration), improving RB5 biosorption from 476.203 to 480.569 mg/g. The RSM showed that the predicted and experimental responses showed nearly perfect relationship with R2 (0.9851) and adjusted R2 (0.9716). The kinetic study revealed that the adsorption process was best described by pseudo second order, followed by Modified-Freundlich, Hyperbolic tangent, Sigmoidal Chapman and Pseudo-nth order model. Likewise, the adsorption isotherm study indicated that Langmuir isotherm ( with adsorption capacity of 618.516 mg/g) is the best-performing model, followed by Brouers–Sotolongo, Toth, Redlich-Peterson and Vieth-Sladek. FTIR and XRD studies indicated the involvement of bacterial functional groups in the biosorption of RB5. The thermodynamic results revealed that the adsorption of RB5 is spontaneous, exothermic in nature]
[This finding indicates the potential of Bacillus sp. for effective biosorption treatment of dye-polluted water.]
[The best isolate was physically and chemically modified with subsequent immobilization using sodium alginate. Optimizations (OFAT and placket Burman design (PBD), RSM), Kinetic, isotherm and characterization (FTTIR and XRD) studies subsequently followed.]
[The results revealed that out of the isolates screened, Bacillus cereus S-2-3 was the best candidate, with 50% adsorption efficiency. Out of the four chemical modifications used (H2SO4, HCL, Acetic acid and NaOH), HCL-modified and heat-treated Bacillus cereus S-2-3 exhibited the highest biosorption efficiency. Different factors were selected based on the OFAT results for PBD screening which gave 3 significant factors (pH, adsorbent dosage and dye concentration), improving RB5 biosorption from 476.203 to 480.569 mg/g. The RSM showed that the predicted and experimental responses showed nearly perfect relationship with R2 (0.9851) and adjusted R2 (0.9716). The kinetic study revealed that the adsorption process was best described by pseudo second order, followed by Modified-Freundlich, Hyperbolic tangent, Sigmoidal Chapman and Pseudo-nth order model. Likewise, the adsorption isotherm study indicated that Langmuir isotherm ( with adsorption capacity of 618.516 mg/g) is the best-performing model, followed by Brouers–Sotolongo, Toth, Redlich-Peterson and Vieth-Sladek. FTIR and XRD studies indicated the involvement of bacterial functional groups in the biosorption of RB5. The thermodynamic results revealed that the adsorption of RB5 is spontaneous, exothermic in nature]
[This finding indicates the potential of Bacillus sp. for effective biosorption treatment of dye-polluted water.]
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