Titania/gum tragacanth nanohydrogel for methylene blue dye removal from textile wastewater using response surface methodology

2018 ◽  
Vol 68 (1) ◽  
pp. 134-140 ◽  
Author(s):  
Mehdi Rahimdokht ◽  
Elmira Pajootan ◽  
Marziyeh Ranjbar-Mohammadi
Keyword(s):  
Methylene Blue ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Dye Removal ◽  
Textile Wastewater ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Gum Tragacanth

Application of response surface methodology (RSM) for the removal of methylene blue dye from water by nano zero-valent iron (NZVI)

2016 ◽  
Vol 74 (2) ◽  
pp. 343-352 ◽  
Author(s):  
Morteza Khosravi ◽  
Simin Arabi
Keyword(s):  
Methylene Blue ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Contact Time ◽  
Dye Removal ◽  
Water Solution ◽  
Zero Valent Iron ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Nano Zero Valent Iron

In this study, iron zero-valent nanoparticles were synthesized, characterized and studied for removal of methylene blue dye in water solution. The reactions were mathematically described as the function of parameters such as nano zero-valent iron (NZVI) dose, pH, contact time and initial dye concentration, and were modeled by the use of response surface methodology. These experiments were carried out as a central composite design consisting of 30 experiments determined by the 24 full factorial designs with eight axial points and six center points. The results revealed that the optimal conditions for dye removal were NZVI dose 0.1–0.9 g/L, pH 3–11, contact time 20–100 s, and initial dye concentration 10–50 mg/L, respectively. Under these optimal values of process parameters, the dye removal efficiency of 92.87% was observed, which very close to the experimental value (92.21%) in batch experiment. In the optimization, R2 and R2adj correlation coefficients for the model were evaluated as 0.96 and 0.93, respectively.

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