Facile Construction of Sandwich-like TiO2-ZnO-ED-HPV Composite for Photodegradation of Ciprofloxacin

The TiO2-ZnO, TiO2-ZnO-ED and TiO2-ZnO-ED-HPV (TZEDHPV) nanocomposite were successfully prepared by simple hydrothermal process The nanocomposite was characterized and conformed by DRS-UV, FT-IR, XRD, SED and EDX analsis. The DRS-UV analysis of TZEDHPV nanocomposite absorption was increased with the band gap decrease of TiO2-ZnO by the addition of heteropoly acid (HPV). The FT-IR spectra of photocatalyst, presents the characteristic bands of metal oxide, ED and HPV. SEM and EDX analysis reveals clustered microsponge-like structure of catalyst with more number of cavities. Photodegradation of ciprofloxacin (CF conc.: 40 µM), exhibited 98.20 % removal efficiency under UV light. According to the scavenger method results, O2•- radical played a main role in the photocatalytic degradation.

Download Full-text

Photocatalytic Performance of Polyoxometallate Intercalated Layered Double Hydroxide

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.187 ◽

2010 ◽

Vol 663-665 ◽

pp. 187-190 ◽

Cited By ~ 1

Author(s):

Yu Hui Zhang ◽

Ji Xin Su ◽

Xiao Peng Wang ◽

Qi Pan ◽

Wen Qu

Keyword(s):

Methyl Orange ◽

Ir Spectra ◽

Photocatalytic Performance ◽

Uv Light ◽

X Ray Diffraction ◽

X Ray ◽

Uv Light Irradiation ◽

Ft Ir ◽

Double Hydroxide ◽

Degradation Of Methyl Orange

Based on X-ray diffraction results, the gallery height of modified Mg3Al-LDH was expanded to 9.6Å from the original 4.8Å, indicating that the H3PW12O40 was indeed inserted into the hydroxide layers. Moreover, the results of FT-IR spectra proved the Keggin structure of PW11O397- species. The resulting material showed a high activity of degradation of methyl orange in the presence of H2O2 and UV light irradiation.

Download Full-text

Synthesis of MoS2/SrZrO3 heterostructures and their photocatalytic H2 evolution under UV irradiation

RSC Advances ◽

10.1039/c4ra11135d ◽

2015 ◽

Vol 5 (1) ◽

pp. 734-739 ◽

Cited By ~ 32

Author(s):

Qingwen Tian ◽

Li Zhang ◽

Jiahui Liu ◽

Naixu Li ◽

Quanhong Ma ◽

...

Keyword(s):

Uv Irradiation ◽

Uv Light ◽

Hydrothermal Process ◽

Light Irradiation ◽

H2 Evolution ◽

Uv Light Irradiation ◽

Photocatalytic H2 Evolution ◽

Simple Hydrothermal Process

A novel heterojunction of a MoS2/SrZrO3 photocatalyst was successfully synthesized via a simple hydrothermal process and applied to photocatalytic H2 evolution under UV light irradiation.

Download Full-text

Controllable Acid/Base Propriety of Sulfate Modified Mixed Metal Oxide Derived from Hydrotalcite for Synthesis of Propylene Carbonate

Catalysts ◽

10.3390/catal9050470 ◽

2019 ◽

Vol 9 (5) ◽

pp. 470 ◽

Cited By ~ 2

Author(s):

Zhongxie Ding ◽

Wenlong Xu ◽

Xingguang Zhang ◽

Zhen Liu ◽

Jiecan Shen ◽

...

Keyword(s):

Metal Oxide ◽

Ir Spectra ◽

Propylene Carbonate ◽

Sample Surface ◽

Ammonium Persulfate ◽

Mixed Metal Oxide ◽

Acid Base ◽

Base Property ◽

Mixed Metal ◽

Ft Ir

Ammonium persulfate modified mixed metal oxide derived from hydrotalcite with tunable acid/base properties can be prepared via thermal decomposition of Mg-Al hydrotalcite-type precursors and ammonium persulfate. By controlling the ammonium persulfate content, these sulphur mutated samples, denoted as SMgAlO-y (y = 1; 3; 5; 7), were investigated in this research. The resulted materials were characterized by XRD, SEM, FT-IR spectra, Py-IR spectra, XPS, Hammett indicator, CO2-TPD, as well as NH3-TPD. Furthermore, the acid-base property of the sample surface was determined by inverse gas chromatography measurements (IGC). Among all the obtained outcomes, the target SMgAlO-5 demonstrated the maximal Ka/Kb value, and it presented the highest activity as a catalyst in the synthesis of propylene carbonate (PC) through 1,2-propylene glycol and urea, giving the yield of 97.2% at the optimized reaction condition, which indicated that the PC yield counted on the synergic effect of the acidity and basicity on catalysts.

Download Full-text

Synthesis and Characterization of Efficient ZnO/g-C3N4 Nanocomposites Photocatalyst for Photocatalytic Degradation of Methylene Blue

Coatings ◽

10.3390/coatings10050500 ◽

2020 ◽

Vol 10 (5) ◽

pp. 500 ◽

Cited By ~ 4

Author(s):

Renathung C. Ngullie ◽

Saleh O. Alaswad ◽

Kandasamy Bhuvaneswari ◽

Paramasivam Shanmugam ◽

Thangavelu Pazhanivel ◽

...

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Hydrothermal Process ◽

Charge Carriers ◽

X Ray Diffraction ◽

Synthetic Procedure ◽

Ft Ir ◽

Multiple Cycles ◽

Ft Ir Spectroscopy

We examine the photocatalytic activity (PCA) of ZnO/graphitic carbon nitride g-C3N4 (g-CN) composite material for methylene blue (MB) degradation under visible-light irradiation (VLI). The polymeric g-CN materials were fabricated by the pyrolysis of urea and thiourea. More importantly, ZnO/g-CN nanostructured composites were fabricated by adding the different mounts (60, 65, 70, and 75 wt.%) of g-CN into ZnO via the simple hydrothermal process. Among fabricated composites, the 75% ZnO/g-CN nanocomposites displayed a superior PCA for MB degradation, which were ~three-fold an enhancement over the pure ZnO nanoparticles. The fabricated materials have been evaluated by X-ray diffraction (XRD), UV-Vis, Fourier transform infrared (FT-IR) spectroscopy, and electron microscopy. More importantly, the photodegradation of MB could get 98% in ZnO/g-CN could be credited to efficient separation of photo-induced charge carriers between ZnO and g-CN. Also, the recycling efficiency of the as-prepared composites was studied for multiple cycles, which shows that the photocatalysts are stable and suitable to carry out photocatalytic degradation in the logistic mode. Additionally, the probable photocatalytic mechanism has also discussed. The synthetic procedure of ZnO/g-CN based materials can be used in numerous fields such as environmental and in energy storage applications.

Download Full-text

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

Crystals ◽

10.3390/cryst11010059 ◽

2021 ◽

Vol 11 (1) ◽

pp. 59

Author(s):

Sujie Chang ◽

Yuanhua Sang ◽

Hong Liu

Keyword(s):

Band Structure ◽

Photocatalytic Degradation ◽

Charge Separation ◽

High Efficiency ◽

Hydrothermal Process ◽

Photocatalytic Property ◽

Light Response ◽

Practical Application ◽

Structure Engineering ◽

Simple Hydrothermal Process

Band structure engineering and heterojunction photocatalyst construction are efficient approaches to improve the separation of photo-induced electrons and holes, along with enhancing light response ability. By sulfur doping, sodium tantalite (NaTaO3) showed an improved photocatalytic property for the degradation of Rhodamine B (RhB). Sn3O4 nanoflakes were constructed on the surface of NaTaO3 nanocubes, forming a surface heterostructure via a simple hydrothermal process, initially. This heterostructure endows the photocatalyst with an enhanced charge separation rate, resulting in an improved photocatalytic degradation of RhB. Moreover, a possible mechanism over Sn3O4/NaTaO3 and the photodegradation pathway of RhB were proposed as the combined effect of photo-induced electrons and holes. This facile process for band structure engineering and heterostructure construction provides the possibility for the practical application of high-efficiency photocatalysts.

Download Full-text

Cu2O–TiO2 Composite for Photocatalytic Degradation of Benzene and its derivatives Using Visible Light

Current Nanoscience ◽

10.2174/1573413717666210127102749 ◽

2021 ◽

Vol 17 ◽

Author(s):

Satya Vijaya Kumar Nune ◽

Ravi Kumar Golimidi

Keyword(s):

Visible Light ◽

Photocatalytic Degradation ◽

Band Gap ◽

Tio2 Nanoparticles ◽

Uv Light ◽

High Surface ◽

High Surface Area ◽

Visible Region ◽

Copper Ion ◽

Visible Light Active

Background: Heterostructured nanocomposites have gained huge attention for their catalytic properties lately. A wide array of different visible-light-active photocatalysts (VLAPs) have been extensively studied of the past couple of years to fine tune the band gap of various stable semiconductors. Objective: The current investigation reports the sensitization of TiO2 nanoparticles with nano sized cuprous oxide, a wellstudied p-type semiconductor, which has a relatively narrow band gap ranging between 2.1 eV & 2.6 eV, to obtain a visible light active photocatalyst. Methods: visible-light-active Cu2O–TiO2 nanocomposite synthesized using solvo-thermal technique. The nanocomposite’s structure and size properties were studied using powder diffraction (XRD), electron microscopy (FESEM and HRTEM). Cu2O–TiO2 nanocomposite was tested on benzene, toluene and chlorobenzene in contaminated water, under UV and under visible light, for effective implementation in photocatalytic degradation of volatile organic contaminants. Results: The said nanocomposite was crystalline and found to be 40–50 nm in size. No apparent change in the crystal lattice of TiO2 was observed due to the introduction of copper ion, and the nanocomposite also retained high surface area of 76.28 m2 /g. The efficiency of the Cu2O-TiO2 nanoparticles degradation is studied both under UV light and under visible. Cu2O-TiO2 nanoparticles have achieved 97 – 99% degradation of benzene, 92 – 97% degradation of toluene and 95 – 98% degradation of chlorobenzene in water. Conclusion: The said Cu2O–TiO2 nanocomposite is photo-active and showed an overall 95% degradation within 2 hours of treatment under the visible region.

Download Full-text

Chitin/TiO2 Composite for Photocatalytic Degradation of Phenol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.132.105 ◽

2010 ◽

Vol 132 ◽

pp. 105-110 ◽

Cited By ~ 4

Author(s):

Kun Wan ◽

Xiang Hong Peng ◽

Ping Jing Du

Keyword(s):

Photocatalytic Degradation ◽

Ph Value ◽

Uv Light ◽

Sol Gel ◽

Hplc Method ◽

Tetrabutyl Titanate ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir ◽

Crystallographic Structures

Chitin/TiO2 composite was prepared through colloid TiO2 deposited on the chitin by controlling the pH value of the system, while colloid TiO2 was synthesized by the sol–gel method using tetrabutyl titanate as a precursor. The structures and morphologies of the chitin/TiO2 composite were characterized by FT-IR, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic degradation of phenol was investigated by HPLC method. The results revealed that the chitin/ TiO2 composite was an efficient photocatalyst for the degradation of phenol, and 99.2% of the phenol was degraded after 6h under UV light. The TiO2 was adsorbed on the chitin by hydrogen and titanoxane bonds between them. Colloid TiO2 was gradually deposited to form the anatase crystallographic structures, showing 2θ = 25.3, 37.8, 47.8 and 54.6. Such biocompatible photocatalyst might be applied in the field of various phenol pollutants abatement.

Download Full-text

Dye Mixtures Degradation by Multi-Phase BiVO4 Photocatalyst

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.886.138 ◽

2019 ◽

Vol 886 ◽

pp. 138-145 ◽

Cited By ~ 7

Author(s):

Weerasak Chomkitichai ◽

Jiraporn Pama ◽

Pimchanok Jaiyen ◽

Sila Pano ◽

Jiraporn Ketwaraporn ◽

...

Keyword(s):

Photocatalytic Degradation ◽

Uv Light ◽

Mixed Solution ◽

Optimum Conditions ◽

X Ray Diffraction ◽

Calcination Step ◽

Initial Ph ◽

Preparation Step ◽

Ft Ir ◽

Multi Phase

The objective of this research was to prepare multi–phase bismuth vanadate (BiVO4) powder using the solvothermal method to be used as a photocatalyst. In the preparation step, bismuth nitrate and ammonium vanadate were used as the precursors with a mole ratio of 1:1. The mixed solution was diluted to 0.025 M with acetic acid and heated at 200 °C for 2 h in a Teflon–lined stainless steel autoclave vessel. Multi–phase BiVO4was obtained without calcination step. Multi–phase BiVO4was characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT–IR), and energy dispersive spectroscopy (EDS). The efficiency of multi–phase BiVO4for photocatalytic degradation of the mixed dye of methylene blue (MB) and rhodamine B (RhB) solution under UV light irradiation was studied. The concentration of the mixed dye solution was measured by UV–Vis spectrophotometry (UV–Vis). The effect of concentration of catalyst and pH of solution was studied. The optimum conditions for photocatalytic degradation of mixed dye solution were obtained at 0.8 g/L for concentration of multi–phase BiVO4and 7.78 for initial pH of the mixed dye solution.

Download Full-text

IR spectral manifestation of tin impurity sites in titanium dioxide

Himia Fizika ta Tehnologia Poverhni ◽

10.15407/hftp12.03.184 ◽

2021 ◽

Vol 12 (3) ◽

pp. 184-189

Author(s):

O. V. Smirnova ◽

◽

A. G. Grebenyuk ◽

V. V. Lobanov ◽

T. A. Khalyavka ◽

...

Keyword(s):

Titanium Dioxide ◽

Absorption Spectrum ◽

Ir Spectra ◽

Band Gap ◽

Density Functional ◽

Spectral Characteristics ◽

Basis Set ◽

Ultraviolet Region ◽

Vis Spectroscopy ◽

Ft Ir

It is known that titanium dioxide as photocatalyst has significant drawback - limited absorption spectrum in the ultraviolet region makes it impossible to use solar energy. To expands the absorption spectrum of TiO2, the doping of impurities (metal, non-metal, etc.) were used. They affected the electronic structure and spectral characteristics of TiO2. The aim of our work was to investigate the influence of tin impurities on spectral characteristics of titanium dioxide using experimental and theoretical methods. The TiO2 powders modified by different amount of tin (Sn/TiO2) were synthesized by sol-gel method. The samples were characterized by SEM, EDX, FT-IR and UV-VIS spectroscopy. It has been found that Sn/TiO2 consists of fragmented agglomerates in the range of 5–10 mm. EDX spectroscopy prove that powders include Ti, O and Sn elements. Modification of titanium dioxide with tin leads to band gap narrowing of samples, which explains by insertion of Sn atoms into crystal lattice of titanium dioxide, because Ti4+ and Sn4+ ions radii are close. The band gap values increased with increasing of tin content. The work also analyzes the vibrational spectra of Sn/TiO2 both experimentally and theoretically. In order to interpret the results obtained, quantum chemical calculations on the spatial and electronic structures of cluster models of titanium dioxide (anatase) with inserted tin atoms using the density functional theory B3LYP method and the basis set 6-31G (d, p) were carried out and the corresponding FT-IR spectra have been simulated. By comparing the experimental and theoretical results, the influence has been analyzed of the number and arrangement of impurity tin atoms in clusters on the observed IR spectra of the samples. This makes it possible to forgive the most probable structural motives of titanium dioxide particles doped with tin atoms, as well as to establish the fact of the presence of tin atoms in the samples. Based on the comparison of the IR spectra of samples with different numbers of tin atoms, it is possible to quantify their composition.

Download Full-text

Light- or Dark-Colored, L-DOPA-Based Melanins

10.26434/chemrxiv.6668996.v1 ◽

2018 ◽

Author(s):

Koen Vercruysse ◽

Margaret M. Whalen

Keyword(s):

Human Physiology ◽

Ir Spectra ◽

Immune Cells ◽

Chemical Properties ◽

Chemical Signature ◽

Ft Ir

This report is a continuation of previous research on the H2O2-mediated synthesis of melanin-like pigments. We synthesized and characterized L-DOPA-based pigments using air- or H2O2-mediated oxidation. We compared their physic-chemical properties and evaluated their capacity to affect the interleukin release from immune cells. The use of higher concentrations of H2O2 resulted in melanin-like materials with a distinct chemical signature in their FT-IR spectra and a lighter color. All pigments enhanced the interleukin release from immune cells. The possibility that lighter-colored melanins can be generated is discussed in the context of the importance of melanin-based pigmentation in human physiology.

Download Full-text