Sonophotocatalytic degradation of trypan blue and vesuvine dyes in the presence of blue light active photocatalyst of Ag3PO4/Bi2S3-HKUST-1-MOF: Central composite optimization and synergistic effect study

et al. 2018

A highly efficient rotating packed bed photocatalytic reactor based on Fe3O4@PbS@Ni2P composite for the degradation of fenpyroximate (FP) as an acaricide in agriculture is described. The visible‐light‐driven photocatalyst was characterized using various techniques. The interaction of operational parameters consisting of rotational speed (400–1200 rpm), photocatalyst dosage (0.20–0.40 g l−1), solution flow rate (0.10–0.50 l min−1), aeration rate (15–35 l min−1), FP initial concentration (5–45 mg l−1), pH (2–10) and irradiation time (20–100 min) for FP degradation was examined via central composite design under response surface methodology. Accordingly, under the suggested optimum conditions, namely rotational speed of 950 rpm, Fe3O4@PbS@Ni2P dosage of 0.30 g l−1, solution flow rate of 0.30 l min−1, aeration rate of 25 l min−1, pH of 6.0 and irradiation time of 85 min, more than 99% of 45 mg l−1 FP was degraded. The Langmuir–Hinshelwood kinetic model was the best equation for the description of the experimental data. According to the rate constant, the contribution of photocatalytic degradation, adsorption and photolysis to the reduction of FP concentration and, subsequently, the efficiency of water treatment were studied.

Section: Methodsmentioning

confidence: 99%

Visible‐light‐driven photocatalytic degradation of fenpyroximate in rotating packed bed reactor using Fe₃O₄@PbS@Ni₂P magnetic nanocomposite photocatalyst: Response surface modelling and optimization

Mosleh

Rahimi

et al. 2018

“…R 2 ) were used to assess the quality of the model . Interpretation of the three‐dimensional (3D) plots provides the best interaction conditions …”

Section: Experimental Methodsmentioning

confidence: 99%

“…MOFs are generally constructed by coordination of metal ions clusters and organic ligands, which have developed very successfully in recent years. In the last 10 years, there have been many papers published on the use of MOFs in adsorptive removal of dyes . However, finding MOFs with high efficiency to adsorb specific organic dyes is a crucial task .…”

Section: Introductionmentioning

confidence: 99%

Use of metal composite MOF‐5‐Ag₂O‐NPs as an adsorbent for the removal of Auramine O dye under ultrasound energy conditions

Hosseinpour

Karimipour

et al. 2017

In this work, MOF‐5 composited with Ag2O nanoparticles was prepared and characterized via X‐ray diffraction, field emission‐scanning electron microscopy, energy‐dispersive spectroscopy and FT‐IR analysis. This new material was subsequently employed for removing basic yellow dye [Auramine O (AO)] from aqueous solution under ultrasound irradiation. Several experiments were designed by central composite design in which operational parameters such as such as pH, MOF‐5‐Ag2O mass and initial concentration of AO involved in the process were optimized. The significance of individual parameters and their possible interactions were investigated using analysis of variance (anova). The optimum values of 6, 0.025 g and 6 mg l−1 were obtained for the pH, MOF‐5‐Ag2O‐NPs mass and the initial concentrations of AO, respectively, with desirability of 1.0. At such conditions, the efficiency for the removal of AO was found to be 89.45%. Various isotherm models for fitting the experimental equilibrium data were studied, and it was found that the Langmuir model has the highest efficiency for correlation of experimental equilibrium data, so that the monolayer adsorption capacity of MOF‐5‐Ag2O for successful removal of AO was 260.70 mg g−1 at optimal conditions.

“…Central composite design (CCD) is a statistical and mathematical technique that widely used for modeling of input data (independent variables) and analysis of response/output (dependent variable) The purpose of CCD is to simultaneously optimize the levels of selected input parameters to obtain the best response. CCD is used to investigated the effect of individual and interactions of input parameters on the response.…”

Section: Experiment‐materials and Methodsmentioning

confidence: 99%

Optimization of solid phase dispersive field‐assisted ultrasonication for the extraction of auramine O and crystal violet dyes using central composite design

Pourebrahim

Dashtian

et al. 2017

Simultaneous preconcentration and determination of auramine o (AO) and crystal violet (CV) dyes from aqueous solution was conducted by ultrasound assisted (dispersive) solid phase microextraction (UASPME) based on SnO2/SnS composite loaded activated carbon (SnO2/SnS‐NCs‐AC). The prepared of SnO2/SnS‐NCs‐AC was characterized by FESEM and XRD analysis. Main and interaction influences of operational parameters such as pH, sonication time, amounts of sorbent, and type of eluent on extraction efficiency were investigated by central composite design and optimized with desirability function approach (DFA). ANOVA was conducted and shows that optimized values were found at 15.33 min sonication time, 0.019 g SnO2/SnS‐NCs‐AC mass, pH 5.46 and among different solvents, dimethyl formamide was selected as an efficient eluent. Under this conditions recoverees percentage were obtained 82.85% and 86.70% for AO and CV, respectively. Based on F‐test under ANOVA all main effect and interaction effect of understudy parameters has the significant effect on the responses. At optimum conditions, limit of detection (0.0015 and 0.001 mg/l), limit of quantitation (0.4 and 0.4 mg/l), limit of linearity (9.0 and 9.0 mg/l), enrichment factor (33.48 and 83.71) and percent relative standard deviation (3.44 and 4.20) were found to be for auramine o and crystal violet dyes, respectively. Finally, the method was successfully applied for the preconcentration and determination of AO and CV in water samples and ER% of 89.0‐97.0 and 96.2–98.0% as acceptable range were found to be for AO and CV samples, respectively.