Reduction of hexavalent chromium by green synthesized nano zero valent iron and process optimization using response surface methodology

2016 ◽  
Vol 5 ◽  
pp. 136-147 ◽  
Author(s):  
Biruck Desalegn Yirsaw ◽  
Mallavarapu Megharaj ◽  
Zuliang Chen ◽  
Ravi Naidu
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Hexavalent Chromium ◽  
Process Optimization ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron

scholarly journals Removal of benzotriazole by Photo-Fenton like process using nano zero-valent iron: response surface methodology with a Box-Behnken design

2017 ◽  
Vol 19 (1) ◽  
pp. 104-112 ◽  
Author(s):  
Mehdi Ahmadi ◽  
Kurosh Rahmani ◽  
Ayat Rahmani ◽  
Hasan Rahmani
Keyword(s):  
Response Surface Methodology ◽  
Electron Microscope ◽  
Response Surface ◽  
Sem Analysis ◽  
Zero Valent Iron ◽  
X Ray Diffraction ◽  
Box Behnken Design ◽  
Transmission Electron ◽  
Nano Zero Valent Iron ◽  
Good Agreement

Abstract In this paper, the removal of benzotriazole (BTA) was investigated by a Photo-Fenton process using nano zero valent iron (NZVI) and optimization by response surface methodology based on Box-Behnken method. Effect of operating parameters affecting removal efficiency such as H2O2, NZVI, and BTA concentrations as well as pH was studied. All the experiments were performed in the presence of ultraviolet radiation. Predicted levels and BTA removal were found to be in good agreement with the experimental levels (R2 = 0. 9500). The optimal parameters were determined at 60 min reaction time, 15 mg L-1 BTA, 0.10 g L-1 NZVI, and 1.5 mmol L-1 H2O2 for Photo-Fenton-like reaction. NZVI was characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) images, and scanning electron microscope (SEM) analysis.

scholarly journals The Influence of Pluronic F-127 Modification on Nano Zero-Valent Iron (NZVI): Sedimentation and Reactivity with 2,4-Dichlorophenol in Water Using Response Surface Methodology

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 412 ◽  
Author(s):  
Yajun Li ◽  
Yongxiang Zhang ◽  
Qi Jing ◽  
Yuhui Lin
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Colloidal Stability ◽  
Removal Rate ◽  
Zero Valent Iron ◽  
Quadratic Model ◽  
Biphasic Model ◽  
Sedimentation Behavior ◽  
Nano Zero Valent Iron ◽  
The Stability

Nano zero-valent iron (NZVI) is widely used for reducing chlorinated organic pollutants in water. However, the stability of the particles will affect the removal rate of the contaminant. In order to enhance the stability of nano zero-valent iron (NZVI), the particles were modified with F-127 as an environmentally friendly organic stabilizer. The study investigated the effect of the F-127 mass ratio on the colloidal stability of NZVI. Results show that the sedimentation behavior of F-NZVI varied at different mass ratios. A biphasic model was used to describe the two time-dependent settling processes (rapid sedimentation followed by slower settling), and the settling rates were calculated. The surface morphology of the synthesized F-NZVI was observed with a scanning electron microscope (SEM), and the functional groups of the samples were analyzed with Fourier Transform Infrared Spectroscopy (FTIR). Results show that the F-127 was successfully coated on the surface of the NZVI, and that significantly improved the stability of NZVI. Finally, in order to optimize the removal rate of 2,4-dichlorophenol (2,4-DCP) by F-NZVI, three variables were tested: the initial concentration 2,4-DCP, the pH, and the F-NZVI dosage. These were evaluated with a Box-Behnken Design (BBD) of response surface methodology (RSM). The experiments were designed by Design Expert software, and the regression model of fitting quadratic model was established. The following optimum removal conditions were determined: pH = 5, 3.5 g·L−1 F-NZVI for 22.5 mg·L−1 of 2,4-DCP.

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.

scholarly journals Optimization of Cyan flexo dye removal by nano zero-valent iron using response surface methodology

2017 ◽  
Vol 8 (2) ◽  
pp. 35-45 ◽  
Author(s):  
Vesna Kecić ◽  
◽  
Đurđa Kerkez ◽  
Miljana Prica ◽  
Sanja Rapajić ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Dye Removal ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron
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