Search query: Preparation of new visible-light driven nanocomposite photocatalysts

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abstract: Abstract In order to expand the light response range of wide band gap semiconductor photocatalyst (NaTaO3) for effective photocatalytic conversion of Cr(VI) an up conversion luminescence agent (Er3+:YAlO3) is combined with NaTaO3 and a visible light driven photocatalyst, NaTaO3/Er3+:YAlO3, is prepared. Moreover, several conduction band co catalysts (Ag, Au and Pt) are deposited the surface of NaTaO3/Er3+:YAlO3, respectively, to facilitate the transfer rate of photo generated electrons. X ray diffractometer (XRD) energy dispersive X ray spectroscopy (EDX) and scanning electron microscopy (SEM) analyses are employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. In addition, UV vis diffuse reflectance spectra are determined to explore the visible light absorption properties of Er3+:YAlO3, NaTaO3, NaTaO3/Er3+:YAlO3 and X/NaTaO3/Er3+:YAlO3 (X Ag, Au and Pt) Photoluminescence (PL) spectra are used to estimate the recombination rate of electron hole pairs. The effects of irradiation time, photosource kind, solution acidity and used times on the photocatalytic capabilities of NaTaO3/Er3+:YAlO3 and X/NaTaO3/Er3+:YAlO3 (X Ag, Au and Pt) are investigated in detail. The results show that the uses of up conversion luminescence agent (Er3+:YAlO3) and co catalysts (Ag, Au and Pt) can promote NaTaO3 to utilize visible light to carry out the photocatalytic conversion of Cr(VI) Particularly, the prepared Au/NaTaO3/Er3+:YAlO3 nanocomposite with 1.0 wt% Au and 0.3:1.0 molar ratio of Er3+:YAlO3 and NaTaO3 shows the highest photocatalytic activity in conversion of Cr(VI)
author_names: Bowen Li

Yidi Wang

Fangyuan Tian

Guanshu Li

Zhaohong Zhang

Jun Wang

Youtao Song
title: Preparation of new visible light driven nanocomposite photocatalysts, X/NaTaO3/Er3+:YAlO3 (X Ag, Au and Pt) for photocatalytic conversion of Cr(VI)
year: 2017

abstract: Abstract The reduced graphene oxide (RGO) loaded Zn 0.5 Cd 0.5 S nanocomposite has been successfully prepared by a facile solvothermal method. The as prepared photocatalysts were characterized by a combination of X ray diffraction (XRD) scanning electron microscopy (SEM) Fourier transform infrared spectroscopy (FT IR) and N 2 absorption desorption. The Zn 0.5 Cd 0.5 S@RGO composites with a RGO content of 0.5 wt% (GS 0.5) showed the highest photocatalytic activity for the degradation of various dyes (methylene blue, methyl orange and Rhodamine B) which is mainly due to the uniform dispersion of nanoparticles on RGO sheets and the enhanced separation rate of photo induced electrons and holes. The GS 0.5 photocatalyst can be repetitively used without significant loss of activity. This new material holds great promise for applications in the field of water purification as well as optoelectronic fields at a large scale.
author_names: Xiong-fei Zhang

Yanzhan Chen

Yi Feng

Xingguang Zhang

Jianhao Qiu

Mingmin Jia

Jianfeng Yao
title: Facile preparation of Zn0.5Cd0.5S@RGO nanocomposites as efficient visible light driven photocatalysts
year: 2017

abstract: A new series of visible light driven TiO2 photocatalysts constituting lattice doped Ni and surface coupled SnO2 nanocomposites, xNi TiO2 SnO2 (x=0.1, 0.3, 0.5) were synthesized. TiO2 and xNi TiO2 were prepared by a sol gel method while the SnO2 was coupled to these via a ligand exchange reaction and finally the catalysts were thermally treated. The presence of Ni ions in the lattice of the photocatalysts was indirectly confirmed by a red shift in DRS spectra. XRD showed crystalline peaks only assignable to TiO2 anatase phase. XPS analysis confirmed that Sn is present on the surface of the catalysts as SnO2 while Ni(2)O(3) is absent. The xNi TiO2 SnO2 nanocomposites showed a promising visible light responsive photocatalytic activity and were found superior to TiO2, xNi TiO2 and TiO2 SnO2 for the degradation of toluene in air.
author_names: Romana Khan

Tae-Jeong Kim
title: Preparation and application of visible light responsive Ni doped and SnO2 coupled TiO2 nanocomposite photocatalysts.
venue: Journal of hazardous materials
year: 2009

abstract: Abstract A series of novel ZnO/Ag/Ag 2 WO 4 /AgI nanocomposites have been successfully synthesized by a facile ultrasonic irradiation method and their photocatalytic activities were explored under visible light illumination using rhodamine B. The synthesized nanocomposites were characterized by various techniques to determine their structural, morphological, and electronical properties. Effect of the amount of AgI, as visible light sensitizer, on the photocatalytic activity was studied and it was found that the nanocomposite with 30% of AgI displayed the highest photocatalytic activity. Activity of this photocatalyst was almost 150, 17.8, and 55.1 times greater than those of the ZnO, ZnO/Ag/Ag 2 WO 4 and ZnO/AgI photocatalysts, respectively. Besides, the importance of active species during the degradation process was explored and it was shown that superoxide anion radical has major role in the photodegradation reaction. Moreover, the outstanding performance of the best nanocomposite in degradations of three more dye pollutants was confirmed. Finally, a cascade mechanism was proposed for the greatly enhanced activity of the nanocomposites in degradation reactions.
author_names: Mahsa Pirhashemi

Aziz Habibi-Yangjeh
title: Preparation of novel nanocomposites by deposition of Ag2WO4 and AgI over ZnO particles: Efficient plasmonic visible light driven photocatalysts through a cascade mechanism
year: 2017

abstract: In this paper, we successfully fabricated quaternary g C3N4/Fe3O4/AgI/Bi2S3 nanocomposites with various weight percents of Bi2S3, as novel magnetically separable visible light driven photocatalysts, using a facile refluxing method at 96 degC. The prepared samples were characterized by XRD, EDX, SEM, TEM, UV vis DRS, FT IR, TGA, BET, PL, and VSM techniques. Photocatalytic activity of the samples was investigated by degradation of rhodamine B, methylene blue, and fuchsine under visible light illumination. It was found that photocatalytic activity of the g C3N4/Fe3O4/AgI/Bi2S3 (30% nanocomposite, as the optimal photocatalyst, in the degradation of RhB is nearly 56, 44, 6.5, and 16 folds higher than those of the g C3N4, g C3N4/Fe3O4, g C3N4/Fe3O4/AgI (20% and g C3N4/Fe3O4/Bi2S3 (30% samples, respectively. Furthermore, the effects of refluxing time, calcination temperature, scavengers of the reactive species, and number of recycling runs on the photocatalytic activity were investigated. Based on the results, the improved photocatalytic activity was attributed to the enhanced visible light absorption ability and matching energy levels of the counterparts that facilitate generation and separation of electron hole pairs, respectively.
author_names: Anise Akhundi

Aziz Habibi-Yangjeh
title: Facile preparation of novel quaternary g C3N4/Fe3O4/AgI/Bi2S3 nanocomposites: magnetically separable visible light driven photocatalysts with significantly enhanced activity
year: 2016

abstract: The present work demonstrates preparation of novel ternary ZnO/AgI/Fe3O4 nanocomposites, as magnetically separable visible light driven photocatalysts using ultrasonic irradiation method. The XRD, EDX, SEM, TEM, UV vis DRS, FT IR, PL, and VSM techniques was applied for characterization of structure, purity, morphology, optical, and magnetic properties of the resultant samples. The superior activity was seen for the nanocomposite with 8 weight ratio of ZnO/AgI to Fe3O4 in degradation of rhodamine B under visible light irradiation. Photocatalytic activity of this nanocomposite in degradation of rhodamine B, methylene blue, and methyl orange is about 32, 6, and 5 fold higher than that of the ZnO/Fe3O4 nanocomposite. The highly enhanced activity of the ternary magnetic photocatalyst was mainly attributed to more visible light absorption ability and efficiently separation of the charge carriers. Furthermore, it was revealed that the ultrasonic irradiation time and calcination temperature affect largely on the photocatalytic activity. Finally, the magnetic photocatalyst was successfully separated from the treated solution using external magnetic field.
author_names: Maryam Shekofteh-Gohari

Aziz Habibi-Yangjeh
title: Ultrasonic assisted preparation of novel ternary ZnO/AgI/Fe3O4 nanocomposites as magnetically separable visible light driven photocatalysts with excellent activity.
venue: Journal of colloid and interface science
year: 2016

abstract: Abstract The present study reports the effective solid state preparation of CuInSe2/NiFe2O4 nanocomposites by simple MOF assisted synthesis at moderate temperatures. The as synthesized CuInSe2/NiFe2O4 nanocomposites were systematically analysed to evaluate their structural and morphological features using XRD, SEM, and HRTEM. The photocatalytic performances of the CuInSe2/NiFe2O4 nanocomposites were evaluated for the degradation of two endocrine disruptors namely, bisphenol A and resorcinol. The photocatalytic performances revealed that the CuInSe2/NiFe2O4 nanocomposite enabled a higher removal rate of bisphenol A and resorcinol under visible light. The generated (degOH) and holes (h+ played a major role in CuInSe2/NiFe2O4 nanocomposites by the removing of aqueous bisphenol A and resorcinol. In addition, CuInSe2/NiFe2O4 photocatalysts could be easily separated from treated wastewater by using an external magnetic field and they were easily recycled, making them an ideal candidate for environmental remediation. Here, CuInSe2/NiFe2O4 nanocomposites were prepared for the first time by coupling MOF derived NiFe2O4 with CuInSe2 in the solid state, route was reported for the first time. From the experimental results and degradation studies, we proposed photocatalytic mechanisms for improving CuInSe2/NiFe2O4 nanocomposite photocatalytic performance. The well organized heterostructure effect and effective separation of photoinduced charge carriers between NiFe2O4 and CuInSe2 enabled faster degradation. The synthesized recyclable CuInSe2/NiFe2O4 nanocomposite has been applied as an alternative photocatalyst material in the treatment of both households and various industrial pollutants.
author_names: Zhenzhen Jiang

Li Feng

Junren Zhu

Bing-zhi Liu

Xuhao Li

Yuning Chen

Sarfaraz Khan
title: Construction of a hierarchical NiFe2O4/ CuInSe2 (p n) heterojunction: Highly efficient visible light driven photocatalyst in the degradation of endocrine disruptors in an aqueous medium
year: 2020

abstract: The design and preparation of highly efficient and durable visible light driven photocatalysts remain a great challenge in the environment remediation. In this paper, a new multi component composite, Fe3O4@TiO2@PDA/SiW11V Ag, is successfully fabricated by in situ assembling Ag nanoparticles (NPs) onto polydopamine (PDA) and mono vanadium substituted silicotungstate (SiW11VO406 simplified as SiW11V) co encapsulated Fe3O4@TiO2 magnetic microspheres. In the photodegradation of methyl orange (MO) and photocatalytic reduction of Cr(VI) under visible light, the multi component composite displays the enhanced catalytic efficiency in comparison with other catalysts with less components. Structure reactivity relationship is established based on the correlation between photocatalytic efficiency and transient photocurrent intensity. Notably, the multi component composite exhibits high stability and durability in wide range of pH aqueous solutions and most of organic solvents. The successful preparation of this novel type of materials provides a promising approach for constructing stable photocatalysts with multi components, where poor compatibility of each component can be well bridged via PDA as an efficient linker and charge transport.
author_names: Panfeng Wu

Qi Xue

Jiquan Liu

Tianyu Wang

Caiting Feng

Bin Liu

Huaiming Hu

Ganglin Xue
title: In Situ Depositing Ag NPs on PDA/SiW11V Co encapsulated Fe3O4@TiO2 Magnetic Microspheres as Highly Efficient and Durable Visible light driven Photocatalysts
year: 2020

abstract: Abstract We report the synthesis of a TiO 2 /Ag binary nanocomposite with high activity for visible light driven photocatalysts using graft copolymerization: (1) conversion of terminal OH groups on the surface of TiO 2 nanoparticles to Cl groups, (2) graft polymerization from TiO 2 Cl via ATRP with ionically charged poly(styrene sulfonic acid) (3) ion exchange process with an AgNO 3 solution following sintering. TiO2/Ag binary nanocomposite showed enhanced photocatalytic performance for the degradation of methyl orange under visible light illumination. The improved photocatalytic performance of the TiO 2 /Ag binary nanocomposite was due to the plasmonic effect, recombination rate of electron hole pairs that was suppressed by Ag nanoparticles.
author_names: Jung Tae Park

Chang Soo Lee

Cheol Hun Park

Jong Hak Kim
title: Preparation of TiO2/Ag binary nanocomposite as high activity visible light driven photocatalyst via graft polymerization
year: 2017

abstract: Abstract In this work, a novel Durio zibethinus shell ash (DSA) supported copper (II) oxide (CuO) nanocomposite has been successfully synthesized via a single step hydrothermal method. The resulting visible light responsive nanocomposite was subjected to the Scanning Electron Microscopy Energy Dispersive X Ray Spectroscopy (SEM EDX) Photoluminescence (PL) X ray Diffraction (XRD) Transmission Electron Microscopy (TEM) Fourier Transform Infrared Spectroscopy (FT IR) and nitrogen adsorption desorption analysis. The major preparation and operational parameters, including the ash impregnation ratio, catalyst loadings, initial dye concentration, irradiation time and solution pH on the photoreaction were examined. Morphological study revealed that DSA served as an excellent supporting surface for the CuO nanoparticles to offer the synergistic adsorption photodegradation reaction, verified by the rising porosity, and changing bandgap energy and surface functionalities. A complete degradation of Acid Red 88 with the high concentration of 500 mg/L was achieved within 2 h. Reusability test ascertained the high durability of the nanocomposite, with greater than 95% of decolourization efficiency even after five regeneration cycles. This study provides a new insight for the design of a low cost, eco friendly and visible light driven photocatalyst, and innovative conversion of Durio zibethinus shell ash into a highly valuable nanocomposite for the effective purification of water contaminants.
author_names: Patrick T M Lum

Kwang-young Lim

Nor Azazi Zakaria

K Y Foo
title: A novel preparation of visible light driven Durio zibethinus shell ash supported CuO nanocomposite for the photocatalytic degradation of acid dye
year: 2020