Box-Behnken methodology for Cr (VI) and leather dyes removal by an eco-friendly biosorbent: F. vesiculosus.
This study focused on leather industrial effluents treatment by biosorption using Fucus vesiculosus as low-cost adsorbent. These effluents are yellowish-brown color and high concentration of Cr (VI). Therefore, biosorption process was optimized using response surface methodology based on Box-Behnken design operating with a simulated leather effluent obtained by mixture of Cr (VI) solution and four leather dyes. The key variables selected were initial solution pH, biomass dosage and CaCl2 concentration in the pretreatment stage. The statistical analysis shows that pH has a negligible effect, being the biomass dosage and CaCl2 concentration the most significant variables. At optimal conditions, 98% of Cr (VI) and 88% of dyes removal can be achieved. Freundlich fitted better to the obtained equilibrium data for all studied systems than Temkin, Langmuir or D-R models. In addition, the use of the final biosorbent as support-substrate to grown of enzyme producer fungi, Pleurotus ostreatus, was also demonstrated.
Department of Chemical Engineering, University of Vigo, Campus As Lagoas, Marcosende, 36310 Vigo, Spain.
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Cobas
Department of Chemical Engineering, University of Vigo, Campus As Lagoas, Marcosende, 36310 Vigo, Spain.
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Sanromán
Department of Chemical Engineering, University of Vigo, Campus As Lagoas, Marcosende, 36310 Vigo, Spain. Electronic address: mcurras@uvigo.es.
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Pazos
D000327:Adsorption; D000704:Analysis of Variance; D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D002021:Buffers; D002122:Calcium Chloride / Q000494:pharmacology; D002857:Chromium / Q000302:isolation & purification*; D004396:Coloring Agents / Q000302:isolation & purification*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D044645:Fucus / Q000737:chemistry* / Q000187:drug effects; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D012965:Sodium Chloride / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared; D013633:Tanning; D013696:Temperature
D002021:Buffers; D004396:Coloring Agents; D007220:Industrial Waste; D002857:Chromium; C074702:chromium hexavalent ion; D012965:Sodium Chloride; D002122:Calcium Chloride
ANOVA; Biosorption; Cr (VI); F. vesiculosus; Leather dyes