Application of watercress (Nasturtium officinale R. Br.) for biotreatment of a textile dye: Investigation of some physiological responses and effects of operational parameters

2014 ◽  
Vol 92 (10) ◽  
pp. 1934-1941 ◽  
Author(s):  
S. Torbati ◽  
A.R. Khataee ◽  
A. Movafeghi
Keyword(s):  
Physiological Responses ◽  
Textile Dye ◽  
Operational Parameters ◽  
Nasturtium Officinale

scholarly journals Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2532 ◽  
Author(s):  
Md. Nahid Pervez ◽  
Felix Y. Telegin ◽  
Yingjie Cai ◽  
Dongsheng Xia ◽  
Tiziano Zarra ◽  
...  
Keyword(s):  
Butyl Alcohol ◽  
Textile Dye ◽  
Oh Radicals ◽  
Operational Parameters ◽  
Reaction Conditions ◽  
Tert Butyl Alcohol ◽  
Initial Ph ◽  
Fe Complex ◽  
Optimal Reaction ◽  
Activated Persulfate

In this study, a Fenton-activated persulfate (Fe2+/PS) system was introduced for the efficient degradation of Mordant Blue 9 (MB 9) as a textile dye in an aqueous solution. Results showed that the degradation of MB 9 was markedly influenced by operational parameters, such as initial pH, PS concentration, Fe2+ concentration, and initial dye concentration. Optimal reaction conditions were then determined. Inorganic anions, such as Cl− and HCO3−, enhanced the degradation efficiency of MB 9 under optimal conditions. Addition of HCO3− reduced the degradation performance of MB 9, whereas the addition of Cl− increased the degradation percentage of MB 9. In addition, quenching experiments were conducted using methanol and tert-butyl alcohol as scavengers, and methanol was identified as an effective scavenger. Thus, the degradation of MB 9 was attributed to S O 4 • − and •OH radicals. The degradation and mineralization efficiency of MB 9 was significantly reduced using the conventional Fenton process i.e., Fe2+/ hydrogen peroxide (HP) because of the formation of a Fe complex during degradation. Meanwhile, the Fe2+/persulfate (PS) system improved the degradation and mineralization performance.

Evaluation of operational parameters from a microfiltration system for indigo blue dye recovery from textile dye effluent

2013 ◽  
Vol 52 (1-3) ◽  
pp. 257-266 ◽  
Author(s):  
Míriam Cristina Santos Amaral ◽  
Luzia Sergina França Neta ◽  
Mariana Souza ◽  
Naiara Cerqueira ◽  
Roberto Bentes de Carvalho
Keyword(s):  
Blue Dye ◽  
Textile Dye ◽  
Operational Parameters ◽  
Textile Dye Effluent ◽  
Indigo Blue

scholarly journals A study of photocatalytic degradation of textile dye CI basic yellow 28 in water using P160 TiO2 based catalyst

2012 ◽  
Vol 77 (12) ◽  
pp. 1747-1757 ◽  
Author(s):  
Veljko Djokic ◽  
Jelena Vujovic ◽  
Aleksandar Marinkovic ◽  
Rada Petrovic ◽  
Djordje Janackovic ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Textile Dye ◽  
Order Kinetic ◽  
Operational Parameters ◽  
First Order ◽  
Photodegradation Rate ◽  
Vis Spectroscopy ◽  
Langmuir Hinshelwood Mechanism ◽  
Order Kinetic Model ◽  
Alkaline Conditions

The photocatalytic degradation of synthetic textile dye CI Basic Yellow 28 (BY28) in water, using recently synthesized P160 TiO2 based catalyst, under Osram ultra-vitalux? lamp (300 W) light, was studied. The effect of the operational parameters such as initial concentration of catalyst, initial dye concentration and pH was studied. Salt effect was also investigated (NaCl, Na2CO3, Na2SO4, NaNO3). It was found that the optimal concentration of catalyst is 2.0 g L-1. A pseudo first-order kinetic model was illustrated using the Langmuir-Hinshelwood mechanism, and the adsorption equilibrium constant and the rate constant of the surface reaction were calculated (KBY = 6.126 L mg-1 and kC = 0.272 mg L-1 min-1, respectively). The photodegradation rate was higher in weak acidic than in high acidic and alkaline conditions. The presence of CO32- ions increases the photodegradation rate while Cl-, SO42- and NO3-ions decreases the reaction rate. The rate of photodegradation of BY28 was measured using UV-Vis spectroscopy.

scholarly journals Effects of operational parameters of process UV radiation/hydrogen peroxide on decolorization of anthraquinone textile dye

2012 ◽  
Vol 66 (4) ◽  
pp. 479-486
Author(s):  
Miljana Radovic ◽  
Jelena Mitrovic ◽  
Danijela Bojic ◽  
Milos Kostic ◽  
Radomir Ljupkovic ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Dye Decolorization ◽  
Maximum Energy ◽  
Energy Output ◽  
Textile Dye ◽  
Operational Parameters ◽  
Anthraquinone Dye ◽  
Scavenging Effect ◽  
Efficiency Increase ◽  
Initial Ph

The photodegradation of textile dye Reactive Blue 19, an anionic anthraquinone dye of reactive class, was investigated using UV radiation in the presence of H2O2 in UV reactor with low-pressure mercury lamps, with maximum energy output at the wavelength 254 nm. The effects of experimental variables, namely initial pH, initial dye concentration and concentration of peroxide were studied. The change of concentration of RB19 was followed by UV/vis spectrophotometric measurement of absorbance at 592 nm. The increase of the initial pH resulted in the efficiency increase of dye decolorization. The total decolorization was achieved in about 15 min. Results show that with the increase of dye concentration from 10 to 100 mg dm-3 the efficiency of process decreases. With the increase of the initial concentration of H2O2 from 10 to 30 mmol dm-3, the decolorization rate constant increased from 0.083 to 0.120 min1, with the decrease of process rate at the concentrations above. The highest decolorization rates were achieved at peroxide concentration of approx. 30 mmol dm-3, above which decolorization was inhibited by scavenging effect of peroxide. This study shows that UV/H2O2 process is promising treatment for dye RB 19 degradation in water and wastewater.

Degradation of Textile dye Direct Black 155 and Reactive Red 152 by Photocatalyst WO3

2021 ◽  
Vol 25 (9) ◽  
pp. 35-39
Author(s):  
K.S. Meena ◽  
Kanta Meena
Keyword(s):  
Photocatalytic Degradation ◽  
Environmental Problems ◽  
Textile Dye ◽  
Operational Parameters

The environmental problems are caused by different sorts of pollutants. Photocatalytic degradation of Direct black 155 and Reactive red 152 dye was examined by using U.V. light in photochemical reactor with WO3 photocatalyst. Varied operational parameters like catalyst dose, sort of dye and dye concentration were also investigated.

Structurally engineered TiO2–SiO2 monolithic designs for the enhanced photocatalytic degradation of organic textile dye pollutants

2017 ◽  
Vol 10 (02) ◽  
pp. 1750006 ◽  
Author(s):  
T. V. L. Thejaswini ◽  
D. Prabhakaran ◽  
M. Akhila Maheswari
Keyword(s):  
Pore Volume ◽  
High Surface ◽  
High Surface Area ◽  
Textile Dye ◽  
Operational Parameters ◽  
Solution Ph ◽  
Dye Pollutants ◽  
Bet Analysis ◽  
Rapid Removal ◽  
Catalyst Dosage

The rapid removal of organic textile dye (Acid Red-85) using mesoporous TiO2–SiO2 monoliths as photocatalyst material has been studied. The 7:3 mole% ratios of TiO2 and SiO2 within the framework provided a well-ordered cage-like monolithic design with high surface area and pore volume that facilitated faster and efficient degradation of the dye effluents. The photocatalyst has been characterized using XRD, TEM-SAED, UV–Vis-DRS, PL, TGA and BET analysis. The influence of various photocatalytic operational parameters, such as solution pH, dopant stoichiometry, catalyst dosage, dye concentration, kinetics, photo-oxidizers, etc., which could influence on the degradation efficiency, has been studied.

scholarly journals Application of central composite design for the optimization of photo-destruction of a textile dye using UV/S2O82- process

2009 ◽  
Vol 11 (4) ◽  
pp. 38-45 ◽  
Author(s):  
A. Khataee
Keyword(s):  
Reaction Time ◽  
Central Composite Design ◽  
Electrical Energy ◽  
Textile Dye ◽  
Operational Parameters ◽  
Destruction Efficiency ◽  
Uv Lamp ◽  
Electrical Energy Per Order ◽  
Experimental Values ◽  
Central Composite

Application of central composite design for the optimization of photo-destruction of a textile dye using UV/S2O82- process The photooxidative destruction of C. I. Basic Red 46 (BR46) by UV/S2O82- process is presented. Central Composite Design (CCD) was employed to optimize the effects of operational parameters on the photooxidative destruction efficiency. The variables investigated were the initial dye and S2O82- concentrations, reaction time and distance of the solution from UV lamp. The predicted values of the photodestruction efficiency were found to be in good agreement with the experimental values (R2 = 0.9810, Adjusted R2 = 0.9643). The results of the optimization predicted by the model showed that the maximum decolorization efficiency (>98%) was achieved at the optimum conditions of the reaction time 10 min, initial dye concentration 10 mg/l, initial peroxydisulfate concentration 1.5 mmol/l and distance of UV lamp from the solution 6 cm. The figure-of-merit electrical energy per order (EEo) was employed to estimate the electrical energy consumption and related treatment costs.

Electron sources: Past, present, and future

1993 ◽  
Vol 51 ◽  
pp. 764-765
Author(s):  
David C Joy
Keyword(s):  
Glass Tube ◽  
Source Size ◽  
Electron Gun ◽  
Operating Parameters ◽  
Operational Parameters ◽  
Electron Sources ◽  
Difficult Decision ◽  
Probe Size ◽  
Wide Range ◽  
Overall Performance

The electron source is the most important component of the Scanning electron microscope (SEM) since it is this which will determine the overall performance of the machine. The gun performance can be described in terms of quantities such as its brightness, its source size, its energy spread, and its stability and, depending on the chosen application, any of these factors may be the most significant one. The task of the electron gun in an SEM is, in fact, particularly difficult because of the very wide range of operational parameters that may be required e.g a variation in probe size of from a few angstroms to a few microns, and a probe current which may go from less than a pico-amp to more than a microamp. This wide range of operating parameters makes the choice of the optimum source for scanning microscopy a difficult decision.Historically, the first step up from the sealed glass tube ‘cathode ray generator’ was the simple, diode, tungsten thermionic emitter.

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