scholarly journals Physical Properties of PVDF-GO/Black-TiO2 Nanofibers and its Photocatalytic Degradation of Methylene Blue and Malachite Green Dyes

2020 ◽  
Author(s):  
M K Abdelmaksoud ◽  
Alaa Mohamed ◽  
Abderrahman Sayed ◽  
S A Khairy
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Malachite Green ◽  
Diffuse Reflectance Spectroscopy ◽  
Ph Value ◽  
Degradation Efficiency ◽  
Tio2 Nanofibers ◽  
Particle Distributions ◽  
Optimum Ph ◽  
Visible Light Driven

Abstract BackgroundBlack TiO2 and Graphene Oxide (GO) have attracted intensive attention as an effective catalyst on visible light driven for photodegrading of dyes. In this study, nano-black TiO2 was prepared by a simple hydrogenation of the anatase titanium oxide and the graphene oxide was prepared by applying the modified Hummers method. The prepared powders and nanofiber membranes are carefully examined to ensure their single phase and compound structure formation as well as to measure the equivalent crystallite size and particle distributions. ResultsThe optimum degradation efficiency of malachite green and methylene blue dyes occurred at pH values of 8 and 10, respectively. Afterwards, at the optimum pH value of 8, for malachite green, the degradation efficiency is peaked at 20 mg of the nano-black TiO2 concentration. Then, a comparison of the degradation efficiency of the two mentioned dyes are performed as the fore-mentioned nanofibers are loaded with 20 mg nano-black TiO2 at the corresponding optimum pH vales. ConclusionsThe diffuse reflectance spectroscopy has been investigated to find out the optical energy gaps of the treated and nano-black samples. Finally, a schematic of the redox reaction mechanism has been proposed.

Study on Adsorption Properties of Different Dyes on Montmorillonite

2012 ◽  
Vol 454 ◽  
pp. 305-309 ◽  
Author(s):  
Ping Chen ◽  
Xian Jun Lu ◽  
Jun Qiu
Keyword(s):  
Methylene Blue ◽  
Ph Value ◽  
Carbon Chain ◽  
Adsorption Properties ◽  
Organically Modified ◽  
Optimum Ph ◽  
Before And After ◽  
Higher Temperature ◽  
Adsorption Amount ◽  
Acid Blue

Using Octadecyltrimethylammonium cations with long carbon chain to modify calcium montmorillonite samples, the adsorption properties of different dyes on montmorillonite before and after modification were investigated. Results showed that the basic dye of methylene blue was easily adsorbed by natual calcium montmorillonite, while the adsorption ability for acid blue and neutral blue was greatly improved when it was organically modified, and the adsorption amount increased with the increasing of modifier dosage. The adsorption ratio was influnced by reaction time, the temperature and the solution’s pH value. It suggested that the adsorption balance time was about 60min; higher temperature was good for acid blue adsorbed on organic montmorillonite, but neutral blue’s adsorption amount was greater at the room temperature; the optimum pH was 9 for methylene blue adsorption, while low pH was better for acid blue and neutral blue adsorption.

scholarly journals Photocatalytic and adsorption property of ZnS–TiO2/RGO ternary composites for methylene blue degradation

2018 ◽  
Vol 37 (9-10) ◽  
pp. 764-776 ◽  
Author(s):  
YL Qin ◽  
WW Zhao ◽  
Z Sun ◽  
XY Liu ◽  
GL Shi ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Visible Light ◽  
Adsorption Property ◽  
Light Irradiation ◽  
Tetrabutyl Titanate ◽  
Thermal Method ◽  
Photocatalytic Effect ◽  
Dioxide Powder ◽  
Visible Light Driven

The visible light–driven ZnS–TiO2/RGO nanocomposites, with good visible light–driven photocatalytic activity, utilizing graphene oxide as precursor, were successfully synthesized via a facile solvothermal thermal method with graphene oxide as precursor. Ti4+ ions were derived from titanium dioxide powder (TiO2, P25) and tetrabutyl titanate. S2− ions and Zn2+ ions were provided by sodium sulfide and zinc acetate, respectively. The photocatalytic and absorbance activity of the nanocomposites was investigated through the photocatalytic degradation of methylene blue in aqueous solution. The results showed that the ZnS–TiO2/RGO nanocomposite prepared by tetrabutyl titanate exhibited better photocatalytic and adsorbance activity for methylene blue under visible light irradiation and its photocatalytic efficiency reached 90% in 60-min light irradiation, almost 1.5 times that of the synthesized ZnS–TiO2/RGO by P25, which was attributed to a cooperative reaction because of an increase of photo-absorption effect of graphene sheets and photocatalytic effect of ZnS nanoparticles. The adsorbance activity for ZnS–TiO2/RGO–tetrabutyl titanate) reached 48%, which was almost 1.7 times higher than that of ZnS–TiO2/RGO-P25 and almost 3.7 times higher than that of ZnS/RGO.

scholarly journals Study on Influencing Factors of Adsorption of Methylene Blue on Magnetic Graphene Oxide Composite

2020 ◽  
Vol 218 ◽  
pp. 03035
Author(s):  
Yafeng Li ◽  
Jiacheng Li ◽  
Binxin Zhao
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Contact Time ◽  
Ph Value ◽  
Operating Conditions ◽  
Reaction Conditions ◽  
Magnetic Graphene Oxide ◽  
Oxide Composite ◽  
Magnetic Graphene ◽  
Best Parameter

In order to explore the optimal reaction conditions of magnetic graphene oxide composite materials for the treatment of methylene blue wastewater. By controlling the pH value, contact time, temperature, the amount of adsorbent added for comparative analysis, and finally determine the best operating conditions. The study showed that when the pH value was 7, the contact time was 1440 min, the reaction temperature was 25 ° C, and the dosage of the adsorbent was 0.5 g / L, the treatment effect was the best. Parameter optimization can effectively improve the processing effect.

Photodegradation of Dimethyl Phthalate Induced by Photolysis of Fe(III)-Pyruvate Complex

2012 ◽  
Vol 518-523 ◽  
pp. 2653-2656
Author(s):  
Xiang Hua Feng ◽  
Liang Ding ◽  
Shi Min Ding
Keyword(s):  
Ph Value ◽  
Degradation Efficiency ◽  
Uv Disinfection ◽  
Light Sources ◽  
Dimethyl Phthalate ◽  
Initial Concentration ◽  
Photodegradation Efficiency ◽  
Optimum Ph ◽  
Initial Ph ◽  
Metal Halide Lamps

Photodegradation of dimethyl phthalate (DMP) in aqueous solutions by Fe(III)-pyruvate complex system was preliminarily investigated. The influences such as light sources, initial pH value, initial concentration of Fe(III), pyruvate and DMP on photodegradation efficiency of DMP were discussed in detail. The result indicates that DMP could be decomposed efficiently in Fe(III)-pyruvate system. The degradation efficiency of DMP are dependent on initial pH value, Fe (III) initial concentration and pyruvate initial concentration. The optimum pH for photodegration of DMP is 3.0. The degradation efficiency of DMP increases with increase of the initial concentrations of Fe(III) or pyruvate, whereas decreases with increase of the initial concentrations of DMP. Various light sources including metal halide lamps, daylight lamps, UV disinfection lamps and sunlight can be adopted in the system.

Kinetic and Equilibrium of Biosorption of Methylene Blue by Sunflower Straw

2012 ◽  
Vol 610-613 ◽  
pp. 194-197
Author(s):  
Li Ping Chen ◽  
Si Qin Dalai
Keyword(s):  
Methylene Blue ◽  
Ph Value ◽  
Low Cost ◽  
Order Equation ◽  
Solution Ph ◽  
Biosorption Process ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Batch Biosorption ◽  
Sunflower Straw

With sunflower straw as low-cost biosorbent, the biosorption of methylene blue (MB) from aqueous solution was studied by batch biosorption technique. The biosorption experiments were carried out under different conditions of solution pH, sunflower straw dose, and temperature. The results showed that biosorption of MB on to sunflower straw affected remarkably by the pH value, and the maximum biosorption amount was achieved at an optimum pH of 12.0; the equilibrium biosorption amount decreased as temperature was increasing, and the biosorption process might be depicted primly by Langmuir function; It was shown that the biosorption of methylene blue could be described by the pseudo-second-order equation.

Adsorptive removal of methylene blue (MB) and malachite green (MG) dyes from aqueous solutions using graphene oxide (GO)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Raja Babu Chilakapati ◽  
S. Hemanth Kumar ◽  
Suggala V. Satyanarayana ◽  
Dilip Kumar Behara
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Malachite Green ◽  
Electrostatic Interactions ◽  
Dye Molecules ◽  
Solution Ph ◽  
Increase With Increase ◽  
Adsorption Data ◽  
Modified Hummers Method

Abstract Graphene oxide (GO) synthesized via modified Hummers method was studied for adsorption of methylene blue (MB) and malachite green (MG) dyes from aqueous solutions. It is hypothesized that electrostatic interactions between dye molecules and surface of GO will facilitate charge carrier movements and degrade the dye in an efficient way. The as synthesized GO was characterized using various characterization techniques such as XRD, Raman, FTIR, UV–Vis, SEM and EDAX. The experimental results suggest that dye removal percentage will increase with increase in adsorbent dosage, time as well as solution pH and the process was exothermic in nature. The adsorption data at 293 K could be fitted by Langmuir equation with a maximum adsorption amount of 119.04, 102.4 mg/g and Langmuir adsorption equilibrium constant of 1.58, 0.867 L/mg for MB and MG dyes, respectively. The outcomes of present article will help not only to understand the adsorption characteristics of GO on MB and MG dyes but also paves path towards development of highly oxidized GO surface for degradation of complex dyes.

scholarly journals CeO2/CdS Heterojunctions Decorated Cotton Fabrics as Facile Recyclable Photocatalysts for Highly Efficient Visible Light Driven Degradation of Methylene Blue

2021 ◽  
Author(s):  
Rui Zou ◽  
Linhua Li ◽  
Lin Yang ◽  
jianwu lan ◽  
Hongyu Liu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Cotton Fabric ◽  
Low Cost ◽  
Light Response ◽  
Cotton Fabrics ◽  
Degradation Efficiency ◽  
Cds Nanoparticles ◽  
Composite Photocatalysts ◽  
Visible Light Driven

Abstract In this work, visible light response CeO2/CdS decorated cotton fabrics as durable and facile recyclable composite photocatalysts were fabricated for photo-degradation of methylene blue (MB). First of all, amino-functionalized CeO2/CdS nanoparticles were synthesized through a fast, efficient and low-cost coprecipitation method. Subsequently, the as-prepared CeO2/CdS nanoparticles were immobilized on aldehyde-functionalized cotton fabric surfaces as composite photocatalysts via "amine-aldehyde" chemical reaction. The surface microstructure and chemical composition of the CeO2/CdS decorated cotton fabric (CeO2/CdS-CF) were characterized by SEM, FTIR and XPS, respectively. The results showed that CeO2/CdS nanoparticles were successfully anchored on the surface of cotton fabric, and distributed uniformly. As expected, the as-prepared CeO2/CdS-CF exhibited excellent photocatalytic activity, which can degrade MB within 90 min with a degradation efficiency of 93.8% under simulated sunlight irradiation, due to the CeO2/CdS heterostructure with the efficient photo-generated charge transfer and separation. In addition, the degradation efficiency remained above 90.3% after five successive degradation cycles, indicating that the obtained CeO2/CdS-CF possessed excellent stability and recyclability. This work opened up a facile preparation way for the fabrication of durable and recyclable composite photocatalysts, and has a promising application in treating dye contaminated wastewater.

scholarly journals Preparation of TiO2/WO3/C/N Composite Nanofibers by Electrospinning Using Precursors Soluble in Water and Their Photocatalytic Activity in Visible Light

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 351
Author(s):  
Vincent Otieno Odhiambo ◽  
Chra Rasool M. Mustafa ◽  
Le Ba Thong ◽  
Zoltán Kónya ◽  
Csaba Cserháti ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Diffuse Reflectance Spectroscopy ◽  
Photocatalytic Property ◽  
Blue Dye ◽  
Tio2 Nanofibers ◽  
Munk Function ◽  
Indirect Band Gap

Extending the absorption range of TiO2 nanofibers to visible light is a great improvement of the photocatalytic property of TiO2. In this study, TiO2/WO3/C/N nanofibers were prepared by electrospinning using precursors soluble in water then annealing in argon. Titanium(IV) bis(ammonium lactato)dihydroxide (TiBALDH) and ammonium metatungstate (AMT) were used as the precursor for TiO2 and WO3 respectively. Different volume ratios of the precursors were added to a solution of PVP before electrospinning. The fibers were studied by XPS, SEM-EDX, TEM, FTIR, XRD, Raman spectroscopy and UV–VIS diffuse reflectance spectroscopy (DRS). The photocatalytic degradation of methylene blue by the fibers in visible light was investigated. The fibers had anatase TiO2 and monoclinic WO3. Based on UV–VIS DRS and Kubelka-Munk function the fibers could absorb visible light. Moreover, 100% TiBALDH had an indirect band gap of 2.9 eV, and the band gap decreased with increase in AMT, i.e., for 0% TiBALDH, band gap was 2.4 eV. The fibers degraded methylene blue dye in visible light, and 90% TiBALDH had the highest photocatalytic activity, i.e., it degraded 40% of the dye after 240 min.

scholarly journals Synthesis of TiO2/g-C3N4 material for visble light driven photocatalytic degradation of methylene blue

2020 ◽  
Vol 9 (3) ◽  
pp. 21-26
Author(s):  
Hoa Dang Thi Ngoc ◽  
Tu Nguyen Thi Thanh
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
Pure Tio2 ◽  
X Ray Diffraction ◽  
Methylene Blue Degradation ◽  
Light Region ◽  
Visible Light Driven ◽  
Kinetics Of

In this study, an efficient strategy for the synthesis of solvent titanium dioxide and titanium dioxide/graphitic carbon nitride (TiO2/g-C3N4) heterostructure photocatalyst was applied to fabricate a kind of visible-light-driven photocatalyst. The obtained samples were  characterised  by  means of  X-ray diffraction, infrared spectroscopy, ultraviolet–visible spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence. The heterostructure shows higher absorption edge towards harvesting more solar energy compared with pure TiO2 and pure g-C3N4 respectively. The  photocatalytic  behaviour  under  visible light  and  kinetics of  the TiO2/g-C3N4 catalyst via methylene blue degradation were addressed. The results showed that the introduction of solvent titanium dioxide  into g-C3N4 enhanced  the  photocatalytic activity in  the  visible  light region.  TiO2/g-C3N4 is  potential  visible  light  driven photocatalyst  for  the  organic substances degradation in aqueous solutions.

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