Multi-responses optimization of simultaneous biosorption of cationic dyes by live yeast Yarrowia lipolytica 70562 from binary solution: Application of first order derivative spectrophotometry

- Novel biosorbent were identified for the Biosorption of dyes.
- SEM was applied to characterize the biosorbent surface.
- Response surface methodology approach was used to optimize the process variables.
- Effect of pH, contact time, dyes concentration were investigated.
- Derivative spectrophotometry approach was used as a great utility for separation and reduction of spectral background interferences.

Present study is based on application of live yeast Yarrowia lipolytica 70562 as new biosorbent was investigated for the simultaneous biosorption of Crystal Violet (CV) and Brilliant Green (BG) from wastewater. The effect of operating parameters such as initial dye concentrations (6-14 mg L−1), solution pH (4.0-8.0) and contact time (4-20 h) was investigated by response surface methodology (RSM) for modeling and optimization of biosorption process and accordingly the best operational conditions was set as: initial CV and BG concentration of 8.0, and 10 mg L−1, pH of 7.0 and contact time of 16 h. Above specified conditions lead to achievement of maximum biosorption of 98.823% and 99.927% for CV and BG dyes, respectively. The experimental equilibrium data well explained according to Langmuir isotherm model with maximum biosorption capacity of 65.359 and 56.497 mg g−1 for BG and CV, respectively. The second order and intraparticle diffusion models as cooperative mechanism has high efficiency and performance for interpretation of real data.

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