Influence of TiO2 dimension and graphene oxide content on the self-cleaning activity of methylene blue-stained photocatalytic films

In this study, self-cleaning polyester (PET) fabrics were prepared using TiOF2 and hexadecyltrimethoxysilane(HDS) treatment. TiOF2 was synthesized via direct fluorination of a precursor TiO2 at various reaction temperatures. The prepared PET fabrics had superior photocatalytic self-cleaning properties compared with anatase TiO2/HDS-treated PET fabrics under UV and sunlight with 98% decomposition of methylene blue. TiOF2/HDS-treated PET fabrics also had superior superhydrophobic self-cleaning properties compared with anatase TiO2/HDS-treated PET fabrics with a 161° water contact angle and 6° roll-off angle. After the self-cleaning tests of the non-dyed TiOF2/HDS-treated PET fabrics, we prepared dyed TiOF2/HDS-treated PET fabrics to test practical aspects of the treatment method. These PET fabrics were barely stained by tomato ketchup; even when stained, they could be self-cleaned within 4 h. These results suggest that practical self-cleaning PET fabrics with superhydrophobicity and photocatalytic degradation could be prepared using TiOF2/HDS-treatment.

Download Full-text

Robust self-cleaning effects of cotton fabrics coated with reduced graphene oxide (RGO)-titanium dioxide (TiO2) nanocomposites

Textile Research Journal ◽

10.1177/00405175211026534 ◽

2021 ◽

pp. 004051752110265

Author(s):

Wenjun Li ◽

Hui Zhang ◽

Tianyu Chen ◽

Limeng Yang ◽

Cuihong Sheng ◽

...

Keyword(s):

Titanium Dioxide ◽

Graphene Oxide ◽

Electron Microscope ◽

Reduced Graphene Oxide ◽

Cotton Fabrics ◽

The Self ◽

Graphene Oxide Nanosheets ◽

X Ray ◽

Reduced Graphene ◽

Self Cleaning

The self-cleaning textiles coated with reduced graphene oxide-titanium dioxide (TiO2) nanocomposites have enhanced photocatalytic activities and could have great potential in practical applications. However, it is still problematic regarding how to avoid aggregation of reduced graphene oxide nanosheets in producing reduced graphene oxide-TiO2 nanocomposites. In this research article, we propose a new method to reduce the aggregation of reduced graphene oxide nanosheets in producing cotton fabrics coated with reduced graphene oxide-TiO2 nanocomposites by combining vibration-assisted ball milling and hydrothermal synthesis process. The microstructure and photocatalytic-related properties of the resultant reduced graphene oxide-TiO2 nanocomposites and their coating cotton fabrics were characterized by using a series of techniques including field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction spectroscopy (XRD), Raman, particle size distribution, Brunauer-Emmett-Teller,(BET), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), diffuse reflectance spectra (DRS), ultraviolet photoelectron spectroscope (UPS), and photoluminescence (PL). It was indicated that the aggregation of reduced graphene oxide nanosheets in reduced graphene oxide-TiO2 nanocomposites was successfully avoided via ball milling in the presence of tetrabutyl titanate. After hydrothermal treatment, the resulting reduced graphene oxide-TiO2 nanocomposites were firmly immobilized on cotton fabric. It was demonstrated in the self-cleaning experiments that the resultant self-cleaning cotton fabrics are hydrophilic and could directly decompose color contaminants such as methylene blue, Congo red, and coffee stains under simulated sunlight irradiation due to the photo-degradation reactions of the reduced graphene oxide-TiO2 nanocomposite coating. The reduced graphene oxide-TiO2 nanocomposite-modified cotton fabric also exhibited excellent performance in both robust abrasion resistance and soap-washing resistance. The fabric photocatalytic self-cleaning capability was not found to decrease significantly after being repeatedly used for five times.

Download Full-text

Removal behavior of methylene blue from graphene oxide/gluten composite material: kinetics, isotherms and thermodynamics

International Journal of Clothing Science and Technology ◽

10.1108/ijcst-04-2020-0056 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Xiaoping Zhang ◽

Yanhui Li ◽

Meixiu Li ◽

Qiuju Du ◽

Hong Li ◽

...

Keyword(s):

Methylene Blue ◽

Composite Material ◽

Graphene Oxide ◽

Load Capacity ◽

Aqueous Environment ◽

Material Research ◽

Oxide Content ◽

Adsorption Effect ◽

Content Type ◽

Textile And Apparel

PurposeIn order to discover a new adsorbent that can be used to purify dye wastewater in the textile and apparel industry, a novel type of graphene oxide/gluten composite material using an improved acid bath coagulation method was synthesized, which can remove methylene blue in an aqueous environment.Design/methodology/approachAfter experimentally compounding different ratios of graphene oxide and gluten, the graphene oxide/gluten composite material with 20% graphene oxide content and superlative adsorption effect was chosen. The synthesized material was characterized by different techniques such as FT-IR and SEM, indicating the microstructure of the material and the success of the composite. Various factors were considered, namely, the influence of temperature, dosage, pH and contact time. The isotherms, kinetics and thermodynamic parameters were successively discussed.FindingsThe qmax value of 214.29 mg/g of the material was higher compared to the general sorbent, thus, the graphene oxide/gluten composite material was a suitable sorbent for methylene blue removal. Overall, the graphene oxide/gluten composite material can be considered as an effectual and prospective adsorbent to remove methylene blue in the textile and apparel industrial effluent.Originality/valueGraphene oxide is a potentially excellent sorbent. However, the high dispersibility of GO is detrimental to adsorption, it disperses rapidly in an aqueous solution making separation and recovery difficult. The high load capacity and recyclability of gluten as a colloid make it a suitable carrier for fixing GO. Studies on the combination of GO and GT into composite adsorption material and for the removal of dyes from dyeing wastewater have not been reported. The composite material research on GO and GT can provide new ideas for the research of these kinds of materials and contribute to its wider and convenient application in wastewater treatment.

Download Full-text

Improved Self-Cleaning Properties of Photocatalytic Gypsum Plaster Enriched with Glass Fiber

Materials ◽

10.3390/ma12030357 ◽

2019 ◽

Vol 12 (3) ◽

pp. 357 ◽

Cited By ~ 1

Author(s):

Kamila Zając ◽

Magdalena Janus ◽

Antoni Morawski

Keyword(s):

Mechanical Properties ◽

Methylene Blue ◽

Titanium Dioxide ◽

Photocatalytic Activity ◽

Glass Fiber ◽

Glass Fibers ◽

The Self ◽

Gypsum Plaster ◽

Self Cleaning ◽

Reactive Orange

In the study the self-cleaning properties of photoactive gypsum plasters are presented. The modified gypsum plasters were obtained by addition of 1 and 3 wt.% of nitrogen-modified titanium dioxide (TiO2/N) and 0.1, 0.3, and 0.5 wt.% of glass fiber. The self-cleaning ability of the obtained materials was tested during two dyes decomposition: Methylene Blue (MB) and Reactive Orange (RO). It was found that presence of glass fiber increased photocatalytic activity of modified gypsum plasters, which may be due to the fact glass fiber may act as ducts for light and transport it to sites screened by TiO2 or glass fiber can retard charge recombination. Moreover, unexpectedly the addition of glass fiber did not increase the mechanical properties of modified gypsum plasters, which may be because gypsum does not strongly adhere to the surface of glass fibers.

Download Full-text

Preparation of the Self-Cleaning and Luminous PVC Membrane Structure Material and its Properties Study

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.332-334.1931 ◽

2011 ◽

Vol 332-334 ◽

pp. 1931-1936 ◽

Cited By ~ 2

Author(s):

Xiao Rong Zhou ◽

Lan Ping Shen

Keyword(s):

Methylene Blue ◽

Organic Matter ◽

Oleic Acid ◽

Surface Treatment ◽

Surface Properties ◽

Membrane Structure ◽

The Self ◽

Pvc Membrane ◽

Photodegradation Efficiency ◽

Self Cleaning

Coating nano-sized TiO2 and SrAl2O4:Eu2 +, Dy3 + lanthanum luminous material on PVC membrane structure material to change its surface properties, then study the self-cleaning and luminous properties after the surface treatment .The results show that: the PVC membrane structure material can degrade the organic matter of methylene blue and oleic acid and has good dirt-pick property after the surface treatment with nano-sized TiO2 and SrAl2O4:Eu2 +, Dy3 +lanthanum luminous material. The photodegradation efficiency reaches to the highest when the TiO2 concentration is 1% and coated for three layer. In addition, the SrAl2O4:Eu2 +, Dy3+ lanthanum luminous material can not only endow the PVC membrane structure material glowing function in the darkness, but also ,it can improves the photodegrading efficiency of the PVC membrane structure material. With the increasing of the concentration of luminous materials, the photodegrading efficiency is increased.

Download Full-text

Preparation of Chitosan/Polyacrylamide/Graphene Oxide Composite Membranes and Study of Their Methylene Blue Adsorption Properties

Materials ◽

10.3390/ma13194407 ◽

2020 ◽

Vol 13 (19) ◽

pp. 4407

Author(s):

Zheqi Wang ◽

Guohua Zhang ◽

Yanhui Li

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Graphene Oxide ◽

Adsorption Equilibrium ◽

Organic Dyes ◽

Chemical Properties ◽

Composite Membranes ◽

Adsorption Properties ◽

Drying Methods ◽

Oxide Content

This thesis reports the preparation of chitosan/polyacrylamide/graphene oxide nanocomposites (CAGs) and a study of its adsorption properties of methylene blue (MB) solution. Initially, we synthesized CAGs by blending and freeze-drying methods. Then, we conducted a series experiments by removing MB from aqueous solution to test its adsorption properties and adsorption mechanism. We used UV-Vis spectrophotometry to determine the concentration of residual methylene blue accurately and efficiently, which has a specific absorption peak at 662 nm in the UV-Vis spectrum, in aqueous solution. When the graphene oxide content in the composite was 20 wt%, the adsorption capacity reached maximum values. The chemical properties and surface structure of the nanomaterials were analyzed using FT-IR, TGA, SEM, and BET. Also, we carried out experiments to measure the adsorption properties of the CAGs by varying several factors, such as initial concentration, adsorption time, and pH, etc. The outcomes revealed that the adsorption equilibrium was developed after 2800 min at 20 °C (room temperature) with an adsorbent dosage of 0.01 g mL−1. The ion adsorption equilibrium data were well-fitted by the Langmuir isotherm with a maximum monolayer capacity of 510.2 mg/g. Kinetic researches disclosed that the adsorption procedure was defined by a pseudo-second-order model. Thermodynamic researches revealed that the enthalpy change (ΔH0) as well as Gibbs free energy change (ΔG0) of the adsorption procedure was negative, indicating that the adsorption procedure was spontaneous and exothermic. After three cycles, the removal efficiency was still 90.18%. Therefore, in conclusion, we believe that the CAGs is a good adsorption material for organic dyes due to its good adsorption and recyclable properties.

Download Full-text

Evaluation of photocatalytic activity of titanosilicate powders of synthetic origin

Transaction Kola Science Cetnre ◽

10.37614/2307-5252.2021.2.5.054 ◽

2021 ◽

Vol 12 (2-2021) ◽

pp. 273-278

Author(s):

A. V. Tsyryatieva ◽

◽

V. V. Tyukavkina ◽

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Phase Composition ◽

Visible Light ◽

Specific Surface ◽

The Self ◽

Cement Stone ◽

Light Sources ◽

Self Cleaning ◽

Imagej Software

In this work, a comparative study of the photocatalytic activity of synthetic titanosilicate powders with differences in phase composition and specific surface area was carried out. Evaluation of the efficiency of decomposition of the dye methylene blue in the presence of titanosilicate additives in an aqueous medium under ultraviolet and visible light sources is given. The self-cleaning ability of titanosilicate-modified cement stone was studied by exposure to ultraviolet and visible light using ImageJ software. The strength of a cement stone modified with a titanosilicate additive has been determined, and its ability to self-cleaning under the influence of ultraviolet and visible light has been studied.

Download Full-text

Anodic voltammetry of pyrazolone derivatives with the help of the self-cleaning rotating electrode

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19870066 ◽

1987 ◽

Vol 52 (1) ◽

pp. 66-71 ◽

Cited By ~ 1

Author(s):

Vesselin C. Noninski ◽

Emanuel B. Sobowale

Keyword(s):

Electrochemical Oxidation ◽

The Self ◽

Good Reproducibility ◽

Rotating Electrode ◽

Pyrazolone Derivatives ◽

Self Cleaning ◽

Anodic Voltammetry

Nine pyrazolone derivatives have been studied by anodic voltammetry using gold self-cleaning rotating electrode (SRE). Voltamograms of good reproducibility are presented. On the basis of voltammetric data a mechanism is proposed for the electrochemical oxidation of sodium 1-phenyl-2,3-dimethyl-4-(N-methylamino)pyrazol-5-one-N-methansulphonate and 1-phenyl-2,3-dimethyl-4-(dimethylamino)pyrazol-5-one in protic medium.

Download Full-text