Combination of photocatalytic degradation and adsorption in dye removal by TiO2-chitosan-glycerol beads under natural sunlight

Abstract The synthesis of TiO2-chitosan-glycerol (TiCsG) beads was prepared to determine the optimum condition for dye removal under natural sunlight. By using the orthogonal array design with five parameters (ratio of TiO2/Chitosan, initial concentration of dyes, pH of solution, irradiation time, dose of TiCsG) to analyze their interaction such as well as optimizing the photocatalytic process. The significant parameters influent in the removal of Acid Blue 193, MO, NWY dyes were irradiation time (p = 0.011) and the ratio of TiO2/chitosan (p = 0.025), while the initial concentration of dyes, pH of dye solution and dose of TiCsG were unimportant factors with p > 0.05. The optimum of factors based on the ratio of signal per noise to attain the highest dye removal ability of TiCsG was the percentage of TiO2/chitosan = 2 % w/w (level 2), initial concentration of dye at level 5 (10 mg/L of AB 193, 5 mg/L for MO and 100 mg/L for NWY), pH =4.5 (level 2), irradiation time =1.5 h (level 5) and dose of TiCsG =0.2 g/mL (level 4).

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Acid Blue 25 Removal by using Electro-Persulfate Process

10.31224/osf.io/n25su ◽

2020 ◽

Author(s):

Zeinab Ghorbani

Keyword(s):

Aqueous Solution ◽

Removal Efficiency ◽

Salt Concentration ◽

Dye Removal ◽

Industrial Effluents ◽

Sodium Persulfate ◽

Initial Concentration ◽

Acid Blue 25 ◽

Sulfate Process ◽

Acid Blue

This study aimed to investigate the efficiency of the electro-persulfate process in removing acid blue 25 from aqueous solution. In order to optimize the parameters, the OFAT method was used, and the effect of three main parameters, including pH, sodium persulfate salt concentration, and current intensity was investigated. According to the results, the optimal removal efficiency of 94% in 60 minutes was obtained under conditions of pH=5, the initial concentration of sodium persulfate=250 mg / L, and the current=500 mA. According to the results of this study, the electro-persulfate process sulfate process can be an efficient process for dye removal from industrial effluents.

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SUPERCRITICAL CARBON DIOXIDE EXTRACTION OF CITRONELLA OIL FROM CYMBOPOGON WINTERIANUS USING TAGUCHI ORTHOGONAL ARRAY DESIGN

International Journal of Applied Pharmaceutics ◽

10.22159/ijap.2018v10i6.28880 ◽

2018 ◽

Vol 10 (6) ◽

pp. 147

Author(s):

Rinaldi Salea ◽

Stevanus Hiendrawan ◽

Erna Subroto ◽

Bambang Veriansyah ◽

Raymond R. Tjandrawinata

Keyword(s):

Carbon Dioxide ◽

Optimum Condition ◽

Taguchi Method ◽

Orthogonal Array ◽

Oil Yield ◽

Orthogonal Array Design ◽

Array Design ◽

Citronella Oil ◽

Cymbopogon Winterianus ◽

Dynamic Extraction

Objective: Optimum condition for the extraction of citronella oil from citronella (Cymbopogon winterianus) using supercritical carbon dioxide (SC-CO2) was investigated.Methods: In order to determine the optimum extraction condition, a Taguchi experiment with L9 orthogonal array design was used. Effects of pressure, temperature and dynamic extraction time on citronella oil yield were investigated at levels ranging between 10-15 MPa, 35-45 °C and 60-180 min, respectively.Results: The highest citronella oil yield (3.206%) was achieved at a factor combination of 15 MPa, 50 °C and 180 min. The obtained citronella oil yield from SC-CO2 extraction was higher than that of percolation as the solvent extraction method using ethanol, which gave a citronella oil yield of 1.4%. The experimental oil yield at optimum condition was in accordance to the values predicted by a computational process using Taguchi method. Analysis of variance (ANOVA) with 95% confidence interval indicates that extraction temperature is the most significant factor in maximizing citronella oil yield, followed by dynamic extraction time and pressure.Conclusion: Optimization process for oil yield from SC-CO2extraction of citronella (Cymbopogon winterianus) was successfully performed using Taguchi L9 orthogonal array design. This study demonstrates that Taguchi method was able to simplify the experimental procedure of SC-CO2 process.

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Acid Blue 25 Removal by using Fe2+ Activated Persulfate

10.31224/osf.io/8dv2h ◽

2020 ◽

Author(s):

Zeinab Ghorbani

Keyword(s):

Textile Industry ◽

Dye Removal ◽

Aqueous Media ◽

Industrial Effluents ◽

Sodium Persulfate ◽

Optimal Conditions ◽

Initial Concentration ◽

The One ◽

Acid Blue ◽

Activated Persulfate

Dyes are one of the most important contaminants in the textile industry wastewater, which are often carcinogenic, and biodegradable. So their removal from the effluent is environmentally important. This study aimed to investigate the efficiency of sodium persulfate in removing dye from aqueous media. In order to optimize each parameter, the one-factor-at-a-time method was used. In this experimental study, the effect of three main parameters including pH, sodium persulfate concentration, and iron (II) concentration on dye removal from aqueous solution was investigated. According to the results obtained from the experiments, the optimal removal efficiency of 92% was obtained in 60 minutes and under optimal conditions of pH=3, the initial concentration of sodium persulfate=500 mg / L, and the initial concentration of iron (II) sulfate=100 mg / L. According to the results, the use of sodium persulfate salt activated with Fe2+ can be an efficient process for dye removal from industrial effluents.

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Formulation Development of Tamoxifen Loaded Lipid Nanoparticle by Taguchi (L12 (2 11)) Orthogonal Array Design

Current Computer - Aided Drug Design ◽

10.2174/1573409916666200320162948 ◽

2020 ◽

Vol 16 ◽

Author(s):

Poovi Ganesan ◽

N Damodharan

Keyword(s):

Orthogonal Array ◽

Drug Loading ◽

Optimization Technique ◽

Pharmaceutical Products ◽

Water Soluble ◽

Nanostructured Lipid Carrier ◽

Orthogonal Array Design ◽

Formulation Development ◽

Array Design ◽

Lipid Nanoparticle

Background: A better understanding of the biopharmaceutical and physicochemical properties of drugs and the pharmaco-technical factors would be of great help for developing pharmaceutical products. But, it is extremely difficult to study the effect of each variable and interaction among them through the conventional approach Objective: To screen the most influential factors affecting the particle size (PS) of lipid nanoparticle (LNPs) (solid lipid nanoparticle (SLN) and nanostructured lipid carrier (NLC)) for poorly water-soluble BCS class-II drug like tamoxifen (TMX) to improve its oral bioavailability and to reduce its toxicity to tolerable limits using Taguchi (L12 (2 11)) orthogonal array design by applying computer optimization technique. Results: The size of all LNPs formulations prepared as per the experimental design varied between 172 nm and 3880 μm, polydispersity index between 0.033 and 1.00, encapsulation efficiency between 70.8% and 75.7%, and drug loading between 5.84% and 9.68%. The study showed spherical and non-spherical as well as aggregated and non-aggregated LNPs. Besides, it showed no interaction and amorphous form of the drug in LNPs formulation. The Blank NLCs exhibited no cytotoxicity on MCF-7 cells as compared to TMX solution, SLNs (F5) and NLCs (F12) suggests that the cause of cell death is primarily from the effect of TMX present in NLCs. Conclusions: The screening study clearly showed the importance of different individual factors significant effect for the LNPs formulation development and its overall performance in an in-vitro study with minimum experimentation thus saving considerable time, efforts, and resources for further in-depth study.

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Supercritical CO2 Extraction of Rhizoma Atractylodis macrocephalae

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.549.60 ◽

2012 ◽

Vol 549 ◽

pp. 60-64

Author(s):

Zhen Huang ◽

Xiao Han Shi ◽

Shao Fang Liu ◽

Wei Juan Jiang

Keyword(s):

Particle Size ◽

Orthogonal Array ◽

Time Pressure ◽

Extraction Yield ◽

Extraction Time ◽

Time Varying ◽

Orthogonal Array Design ◽

Array Design ◽

Different Sources

An orthogonal array design was employed for optimizing the supercritical CO2 extraction of Rhizoma Atractylodis Macrocephalae. The extraction was performed at temperature from 40 to 60oC, pressure from 15 to 35MPa, extraction time varying from 30 to 90min and particle size spanning from 20 to 80 mesh. The results reflect that the extraction yield is more significantly influenced by the extraction time, pressure and particle size but less by temperature. The experiments show that the extraction yield obviously increases with increasing pressure, different from the literatures. In terms of the sample origin, a comparison shows that outstanding differences exist among the extraction yields from different sources.

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Immobilization of Nano-TiO2 on Expanded Perlite for Photocatalytic Degradation of Rhodamine B

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.3795 ◽

2011 ◽

Vol 110-116 ◽

pp. 3795-3800 ◽

Cited By ~ 1

Author(s):

Xiao Zhi Wang ◽

Wei Wei Yong ◽

Wei Qin Yin ◽

Ke Feng ◽

Rong Guo

Keyword(s):

Catalytic Activity ◽

Photocatalytic Degradation ◽

Rhodamine B ◽

Degradation Kinetics ◽

Irradiation Time ◽

Sol Gel ◽

Polluted Water ◽

Order Kinetic ◽

Expanded Perlite ◽

Initial Concentration

Expanded perlite (EP) modified titanium dioxide (TiO2) with different loading times were prepared by Sol-Gel method. Photocatalytic degradation kinetics of Rhodamine B (RhB) in polluted water by the materials (EP-nanoTiO2), as well as the effects of different loading times and the initial concentration of RhB on photocatalysis rate were examined. The catalytic activity of the regenerated photocatalyst was also tested. The results showed that photocatalyst modified three times with TiO2had the highest catalytic activity. Degradation ratio of RhB by EP-nanoTiO2(modified three times) under irradiation for 6 h were 98.0%, 75.6% and 63.2% for 10 mg/L, 20 mg/L and 30 mg/L, respectively.The photocatalyst activity has little change after the five times recycling, and the degradation rate of RhB decreased less than 8%. The reaction of photocatalysis for RhB with irradiation time can be expressed as first-order kinetic mode within the initial concentration range of RhB between 10mg/L and 30 mg/L. EP-nanoTiO2photocatalyst has a higher activity and stability to degrade RhB in aqueous solution.

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Supercritical Fluid Extraction of Pyrrolidine Alkaloid from Leaves of Piper amalago L.

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2017/7401748 ◽

2017 ◽

Vol 2017 ◽

pp. 1-6 ◽

Cited By ~ 7

Author(s):

V. S. Carrara ◽

L. C. Filho ◽

V. A. S. Garcia ◽

V. S. Faiões ◽

E. F. Cunha-Júnior ◽

...

Keyword(s):

Carbon Dioxide ◽

Supercritical Fluid Extraction ◽

Supercritical Fluid ◽

Orthogonal Array ◽

Design Matrix ◽

Supercritical Carbon Dioxide Extraction ◽

Orthogonal Array Design ◽

Fluid Extraction ◽

Array Design ◽

Carbon Dioxide Extraction

Supercritical fluid extraction was used to extract the alkaloid N-[7-(3′,4′-methylenedioxyphenyl)-2(Z),4(Z)-heptadienoyl]pyrrolidine from leaves of Piper amalago L. A three-level orthogonal array design matrix, OAD OA9(34), was used for optimization of the parameters of supercritical extraction of the alkaloid, employing supercritical carbon dioxide: extraction time (20, 40, and 60 min), temperature (40, 50, and 60°C), pressure (150, 200, and 250 bar), and the use of cosolvents (ethanol, methanol, and propyleneglycol). All parameters had significant effect on the alkaloid yield. The alkaloid yield after 60 min of extraction without cosolvents at 9 different conditions (32) in terms of temperature (40, 50, and 60°C) and pressure (150, 200, and 250 bar) was also evaluated. The optimal yield (≈3.8 mg g−1) was obtained with supercritical CO2 + methanol (5% v : v) at 40°C and 200 bar for 60 min of extraction.

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