scholarly journals Visible Light Induced Enhanced Photocatalytic Degradation of Industrial Effluents (Rhodamine B) in Aqueous Media Using TiO2Nanoparticles

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
J. O. Carneiro ◽  
A. P. Samantilleke ◽  
P. Parpot ◽  
F. Fernandes ◽  
M. Pastor ◽  
...  
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Colloidal Stability ◽  
Titanium Dioxide Nanoparticles ◽  
Aqueous Media ◽  
Research Work ◽  
Industrial Effluents ◽  
Intermediate Compound ◽  
X Ray Diffraction ◽  
Textile Materials

In recent years, new textile materials have been developed through the use of nanotechnology-based tools. The development of textile surfaces with self-cleaning properties has a large combined potential to reduce the environmental impact related to pollution. In this research work, three types of textiles substrates (cotton, Entretela, and polylactic acid (PLA)) were functionalized with titanium dioxide nanoparticles (TiO2) using chemical and mechanical processes (padding). During the functionalization process, two different methods were used, both of which allowed a good fixation of nanoparticles of TiO2on textile substrates. The samples were examined for morphology and for photocatalytic properties under visible light irradiation. A study aimed at evaluating the effect of pH of the aqueous solution of TiO2nanoparticles was performed in order to promote interaction between TiO2and the dye solution rhodamine B (Rh-B). The TiO2nanoparticles were characterized by X-ray diffraction (XRD). The measurement of the zeta potential of the TiO2nanoparticle solution proved to be always positive and have low colloidal stability. Chromatography (HPLC and GC-MS) analyses confirm that oxalic acid is the intermediate compound formed during the photodegradation process.

scholarly journals Photocatalytic Performance of SiO2/CNOs/TiO2 to Accelerate the Degradation of Rhodamine B under Visible Light

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1671 ◽  
Author(s):  
Weike Zhang ◽  
Yanrong Zhang ◽  
Kai Yang ◽  
Yanqing Yang ◽  
Jia Jia ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electronic Microscope

A silicon dioxide/carbon nano onions/titanium dioxide (SiO2/CNOs/TiO2) composite was synthesized by a simple sol-gel method and characterized by the methods of X-ray diffraction (XRD), scanning electronic microscope (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), Fourier transform infrared (FTIR), thermogravimetric analysis (TG), differential scanning calorimeter (DSC) and UV-Vis diffuse reflectance spectra (UV-Vis DRS). In this work, the photocatalytic activity of the SiO2/CNOs/TiO2 photocatalyst was assessed by testing the degradation rate of Rhodamine B (RhB) under visible light. The results indicated that the samples exhibited the best photocatalytic activity when the composite consisted of 3% CNOs and the optimum dosage of SiO2/CNOs/TiO2(3%) was 1.5 g/L as evidenced by the highest RhB degradation rate (96%). The SiO2/CNOs/TiO2 composite greatly improved the quantum efficiency of TiO2. This work provides a new option for the modification of subsequent nanocomposite oxide nanoparticles.

scholarly journals Visible light Bi2S3/BiFeO3 photocatalyst for effective removal of Rhodamine B

2018 ◽  
Vol 238 ◽  
pp. 03007
Author(s):  
Xiquan Wang ◽  
Nan Zhang ◽  
Gao Wang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy ◽  
X Ray Diffraction ◽  
Exchange Method ◽  
X Ray ◽  
Effective Removal

Bi2S3-sensitized BiFO3 (BFO) photocatalyst (Bi2S3/BFO) was successfully synthesized through a facile and environmental ion exchange method between BFO and Thiosurea (H2NCSNH2, TU). The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and UV-vis diffuse reflection spectroscopy (DRS). The obtained Bi2S3/BFO composites showed excellent photocatalytic performance for decomposing Rhodamine B (RhB) compared with pure BFO under visible light irradiation (λ>400nm). 5% Bi2S3/BFO exhibited the highest photocatalytic activity and excessive amount of Bi2S3 would result in the decrease of photocatalytic activity of BFO. The mechanism of enhanced photocatalytic activity was proposed on the basis of the calculated energy band positions.

scholarly journals Visible Light Induced Enhanced Photocatalytic Degradation of Industrial Effluents (Rhodamine B) Using BiVO4 Nanoparticles

2019 ◽  
Vol 542 ◽  
pp. 012060
Author(s):  
Nguyen Duy Trinh ◽  
Ho Huy Hoang ◽  
Nong Xuan Linh ◽  
Nguyen Huu Vinh ◽  
Hien Thi Vu ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Industrial Effluents

scholarly journals Synthesis and characterization of Fe-TiO2@SiO2@Fe3O4 magnetic visible light photocatalyst for removal of Rhodamine B dye

2021 ◽  
Vol 10 (2) ◽  
pp. 78-83
Author(s):  
Tien Nguyen Thi Thuy ◽  
Do Tran Dang ◽  
Viet Nguyen Minh ◽  
Ngoc Ha Minh ◽  
Minh Dang Nhat ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Sol Gel ◽  
Photogenerated Electron ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Visible Light Photocatalyst ◽  
Magnetic Curve ◽  
Co Precipitation

In this research, the magnetic visible light photocatalyst of Fe-TiO2@SiO2@Fe3O4 was synthesised using co-precipitation, sol-gel and hydrothermal method. The as-obtained material’s properties were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), diffuse reflectance spectra (UV- Vis), magnetic curve (VSM) and photoluminescence (PL). The catalytic activity of the materials under visible light was investigated for degradation of Rhodamine B pigment  in water. The obtained results indicated that at the catalyst dose of 0.5 g/L, Fe-TiO2@SiO2@Fe3O4 with TiO2/SiO2@Fe3O4 (SF) ratio of 2:1 performed the highest efficiency of  99.3 % after 180 minutes under irritation. The enhanced photocatalytic performance of Rhodamine B under visible light could be ascribed to the reducing of band gap energy and decrease in the recombination rate of photogenerated electron/hole pairs. The catalytic activity after four times of recycling were 71,3 %.The material showed potential for further application in water treatment.

scholarly journals Enhanced Degradation of Rhodamine B by Metallic Organic Frameworks Based on NH2-MIL-125(Ti) under Visible Light

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7741
Author(s):  
Hong-Tham Nguyen Thi ◽  
Kim-Ngan Tran Thi ◽  
Ngoc Bich Hoang ◽  
Bich Thuy Tran ◽  
Trung Sy Do ◽  
...  
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Diffuse Reflectance ◽  
High Efficiency ◽  
Diffuse Reflectance Spectroscopy ◽  
Active Species ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fundamental Properties ◽  
Adsorption Desorption

Samples of the bimetallic-based NH2-MIL-125(Ti) at a ratio of Mn+/Ti4+ is 0.15 (Mn+: Ni2+, Co2+ and Fe3+) were first synthesized using the solvothermal method. Their fundamental properties were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectra, scanning electron microscopy (SEM), N2 adsorption–desorption measurements, and UV–Vis diffuse reflectance spectroscopy (UV-Vis DRS). The as-acquired materials were used as high-efficiency heterogeneous photocatalysts to remove Rhodamine B (RhB) dye under visible light. The results verified that 82.4% of the RhB (3 × 10−5 M) was degraded within 120 min by 15% Fe/Ti−MOFs. Furthermore, in the purpose of degrading Rhodamine B (RhB), the rate constant for the 15% Fe/Ti-MOFs was found to be 2.6 times as fast as that of NH2-MIL-125(Ti). Moreover, the 15% Fe/Ti-MOFs photocatalysts remained stable after three consecutive cycles. The trapping test demonstrated that the major active species in the degradation of the RhB process were hydroxyl radicals (HO∙) and holes (h+).

scholarly journals Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles

2019 ◽  
pp. 87-96
Author(s):  
Ludovic I. Dorkis ◽  
Juan David Cohen ◽  
Jorge I. Tobón
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Uv Light ◽  
Light Irradiation ◽  
Efficiency Coefficient ◽  
Photocatalytic Efficiency ◽  
X Ray Diffraction ◽  
Cement Pastes ◽  
Uv Light Irradiation ◽  
Munk Function

Self-cleaning activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO2−xNy) was studied. Samples with various amounts of TiO2−xNy (1% and 3%) were evaluated under irradiation of UV and visible light, and with two curing ages (65 hour and 28 days). Rhodamine B was the pigment used and its loss of color on the cement pastes was carried out using a Spectrometer UV/Vis measuring the coordinates CIE (Commission Internationale de l’Eclairage) L∗, a∗, b∗. Discoloration of Rhodamine B on the surface of the samples was established as the photocatalytic efficiency coefficient (ε). In addition, samples with TiO2 nanoparticles (1% and 3%) were studied under the same conditions and their performances were compared with TiO2-xNy. The presence of nitrogen in the tetragonal structure of TiO2 was evidenced by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectrophotometry and Carbon, Hydrogen and Nitrogen (CHN) analysis. The band gap for TiO2 and TiO2-xNy was determined by the transformed Kubelka-Munk function ( [F (R∞) hv]1/2). The results have shown a similar behavior for both additions under UV light irradiation, with 3% being the addition with the highest photocatalytic efficiency obtained in the early ages of curing time.  TiO2−xNy showed activity under irradiation with visible light, unlike TiO2, which could only be activated under UV light.  At the late curing ages, the samples with 3% of TiO2-xNy showed the highest efficiency under irradiation of UV and visible light.

Synthesis of γ-Bi2MoO6 Spheres and their Photocatalytic Activities for Degradation of Rhodamine B

2012 ◽  
Vol 476-478 ◽  
pp. 988-993 ◽  
Author(s):  
Shang Feng Wang ◽  
Jian Xu ◽  
Yuan Zhang ◽  
Chang Sheng Guo ◽  
Xiao Chen Li
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Diffuse Reflectance Spectroscopy ◽  
Photophysical Properties ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Structure Morphology ◽  
Photocatalytic Activities ◽  
Visible Light Driven ◽  
Adsorption Desorption

A highly efficient γ-Bi2MoO6 photocatalyst was synthesized by a solvethermal method with the assistance of urea. The structure, morphology and photophysical properties of the Bi2MoO6 were characterized by X-ray diffraction, scanning electron microscope, UV–vis diffuse reflectance spectroscopy and nitrogen adsorption-desorption techniques. The photocatalytic efficiencies were evaluated by the degradation of rhodamine B (RhB) under visible-light irradiation, and the γ-Bi2MoO6 structures displayed significantly higher visible-light-driven photocatalytic activity in comparison to TiO2 nanoparticles.

scholarly journals Investigations on Amphoteric Chitosan/TiO2 Bionanocomposites for Application in Visible Light Induced Photocatalytic Degradation

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
M. Bahal ◽  
N. Kaur ◽  
Nidhi Sharotri ◽  
Dhiraj Sud
Keyword(s):  
Acrylic Acid ◽  
Visible Light ◽  
Degradation Kinetics ◽  
Research Work ◽  
Polymerization Reaction ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Degradation Reaction

The present investigation reports the greener synthesis and characterization of novel acrylic acid grafted amphoteric chitosan/TiO2 (CAT) bionanocomposites using ultrasonic radiations. This was done by grafting of acrylic acid onto chitosan in the presence of potassium persulfate by free radical polymerization reaction. The uniform distribution of metal oxide in CA/TiO2 nanocomposites was achieved on grafted acrylic acid/chitosan which contains a weak anionic group (-COOH) using ultrasonication technique. Physiochemical techniques such as X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Fourier Transform Infra-Red spectroscopy (FT-IR), Energy Dispersive X-ray spectroscopy (EDX), and Thermal Gravimetric Analysis (TGA) were employed to characterize synthesized CAT. Nanocomposite CAT was applied for degradation of industrial dye. Malachite green (MG) often presents in the waste waters. The degradation kinetics were studied by monitoring the photocatalytic reaction for degradation of MG under visible light, and the rate constant of the reaction was found to be 7.13x10−3min−1. The current research work opens vistas for the new dimensions in the area of water treatment by solving the issues related to degradation reaction efficiency in visible light and cost effectiveness.

Photocatalytic Activity of CdSe/K2La2Ti3O10 for Rhodamine B Degradation under Visible Light Illumination

2013 ◽  
Vol 726-731 ◽  
pp. 577-579
Author(s):  
Li Liu ◽  
Ya Fei Wang ◽  
Huan Wang ◽  
Wen Quan Cui ◽  
Ying Hua Liang
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Precipitation Method ◽  
Light Illumination ◽  
Halogen Lamp ◽  
X Ray Diffraction ◽  
X Ray ◽  
Visible Light Illumination ◽  
Catalyst Dosage

The composite CdSe/K2La2Ti3O10 photocatalyst was synthesized via a precipitation method. The structure of the photocatalyst was determined by powder X-ray diffraction. The photocatalytic properties for organic matter degradation of the photocatalyst were examined under visible light irradiation, using rhodamine B as the goal degradation content and halogen lamp (λ > 420 nm) for the light source. The results show that when the pH of the rhodanmine B at 7, initial concentration of 10 mg/L and every 250 mL solution catalyst dosage is 0.25 g, and the degradation rate of rhodamine B for 4 hours was 50%.

Self-Recognizing π-π Stacking Interactions Designed for the Generation of Ultrastable Mesoporous Hydrogen-Bonded Organic Frameworks

2019 ◽  
Author(s):  
KAIKAI MA ◽  
Peng Li ◽  
John Xin ◽  
Yongwei Chen ◽  
Zhijie Chen ◽  
...  
Keyword(s):  
Pore Size ◽  
Fiber Composite ◽  
Aqueous Media ◽  
Stacking Interactions ◽  
Mustard Gas ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expansion Strategy ◽  
Π Stacking ◽  
Hydrogen Bonded

Creating crystalline porous materials with large pores is typically challenging due to undesired interpen-etration, staggered stacking, or weakened framework stability. Here, we report a pore size expansion strategy by self-recognizing π-π stacking interactions in a series of two-dimensional (2D) hydrogen–bonded organic frameworks (HOFs), HOF-10x (x=0,1,2), self-assembled from pyrene-based tectons with systematic elongation of π-conjugated molecular arms. This strategy successfully avoids interpene-tration or staggered stacking and expands the pore size of HOF materials to access mesoporous HOF-102, which features a surface area of ~ 2,500 m2/g and the largest pore volume (1.3 cm3/g) to date among all reported HOFs. More importantly, HOF-102 shows significantly enhanced thermal and chemical stability as evidenced by powder x-ray diffraction and N2 isotherms after treatments in chal-lenging conditions. Such stability enables the adsorption of dyes and cytochrome c from aqueous media by HOF-102 and affords a processible HOF-102/fiber composite for the efficient photochemical detox-ification of a mustard gas simulant.

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