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azo-dye adsorption activity of iron(Ⅲ) loaded novolac-based network sorbents

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Chemical Reports 2019年第2期1卷 51-57页

作者： Samaresh Ghosh Mridula Acharyya Department of Chemistry Bankura Sammilani College Kenduadihi Bankura 722102 West Bengal India.

Iron(Ⅲ) loaded novolac-based network adsorbents 1 and 2 were studied for efficient removal of azo-dye pollutants from aqueous solutions. The adsorption behavior was evaluated by using methyl orange and orange-G as model azo dyes. The effect of parameters such as contact time and initial dye concentration on the adsorption of azo dyes was studied. The results showed that loading of Fe(Ⅲ) onto the sorbent networks has noticeable effect on azo-dye sorption capacity. The adsorption equilibrium data were fitted to Freundlich isotherm model. Besides, the reusability of the dye loaded sorbents was investigated on adjusting pH of solutions.

关键词： adsorption novolac-based network iron(Ⅲ) loading azo-dye

Facile synthesis of graphene anchored rare earth doped mixed metal ferrite nanorods:A potential candidate for azo dye mineralization

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Journal of Rare Earths 2024年第5期42卷 907-916,I0004页

作者： Tehmina Kousar Muhammad Aadil Sonia Zulfiqar Sobhy MIbrahim Sidra Mubeen Warda Hassan Kashuf Shafiq Farzana Mahmood Institute of Chemical Sciences Bahauddin Zakariya UniversityMultan60800Pakistan Department of Chemistry Rahim Yar Khan CampusThe Islarnia University of BahawalpurRahim Yar Khan64200Pakistan Department of Chemistry Faculty of ScienceUniversity of Ostrava30.Dubna 22Ostrava70103Czech Republic Department of Chemical and Biological Engineering Iowa State UniversitySweeney Hall618 Bissell RoadAmeslowa50011United States Department of Biochemistry College of ScienceKing Saud UniversityPO.Box 2455Riyadh11451Saudi Arabi Department of Chemistry The Women University Multan66000Pakistan

Bandgap tuning using rare earth metals as dopants in ferrite-based photocatalytic materials has received a lot of interest because the Fermi 4f energy of these metals generates a sub-energy state in the bandgap generated by the overlapping of Fe-3d and O-2p ***,dysprosium-doped cobalt-nickel mixed ferrite(D-CNFO)and its graphene-reinforced composite(D-CNFO@G)were prepared and an ideal photocatalyst material for azo dye mineralization was proposed.A cost-effective combination of wetchemical and ultrasonication methods was used to prepare the doped and composite *** characterization methodologies were used to scrutinize the optical,compositional,structural,morphological,and photocatalytic characteristics of as-prepared *** X-ray diffraction analysis identified the spinel phase's(cubic)structure,while the electronic spectroscopy examination confirmed the prepared samples'rod-like *** UV/visible absorbance spectrum shows the higher light harvesting behavior of the D-CNFO@G in the visible *** mineralization performance of the DCNFO and D-CNFO@G composites was analyzed using Congo-red(an anionic dye),a well-known azo *** D-CNFO@G sample removes Congo-red dye at a rate almost 2.4%faster than the D-CNFO *** experiment involving trapping free radicals indicates that hydroxyl radical play s a crucial role in dye *** the D-CNFO@G catalyst is magnetic and can be isolated easily from the photocatalytic system,it shows an awkward cycle activity of more than 96%after five mineralization *** asprepared D-CNFO@G composite is proved as an excellent option for azo dye mineralization because of the combined impacts of rare earth doping,graphene reinforcement and nanotechnology.

关键词： azo-dye Composite Graphene Dy-doped Nanotechnology Rare earths

Dependence of the molecular reorientation on the direction of incident light in azo-dye doped liquid crystals

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Dependence of the molecular reorientation on the direction o...

Rapid decolorization of water soluble azo-dyes by nanosized zero-valent iron immobilized on the exchange resin

20th Congress of the International Commission for Optics

作者： Luogen Denga Guohui Wanga Junliang Zhangb Liyuan Luoa Bin Shaoa and Yunhong Zhangba Department of Physics Beijing Institute of Technology Beijing 100081 P. R. China b Department of Chemistry Beijing Institute of Technology Beijing 100081 P. R. China

This paper investigates an optical reorientation process of azo-dye doped liquid crystals and explains the dependence of the enhancement factor on the incident light direction. Because the order param

关键词： Doped liquid crystal enhancement factor order parameters azo-dye photoisomerization

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Science China Chemistry 2008年第2期51卷 186-192页

作者： ZHAO ZongShan LIU JingFu TAI Chao ZHOU QunFang HU JingTian JIANG GuiBin Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Chemistry Shandong UniversityJinan 250100China

Nanosized zero-valent iron (NZVI) supported on the cation exchange resin was synthesized and applied to decompose some water soluble azo dyes. The decomposition efficiency for azo dyes was evaluated by using the aqueous suspensions and parked column of this material. Batch experiments indicated that this novel material exhibited excellent degradation ability for 0.05 g·L1 of Acid Orange 7, Acid Orange 8, Acid Orange 10, Sunset Yellow, and Methyl Orange, with decolorization ratio up to 95% in 4 min; pH value was the key factor for degradation and H+ was one of the reactants; adsorption of azo dyes onto the material existed at the beginning but reduced gradually until disappearing completely. For the packed column system, 58%~90% of azo dyes were decomposed in the 1st circle of solution passing through the column, and the adsorption onto the materials could accelerate the degradation azo dyes with the increasing reaction time. During the degradation process, Fe2+, the product of NZVI, was exchanged to the resin again and could be reduced to Fe0 by KBH4 for reusing. The 10th refreshed NZVI possessed reductive activity up to 90% of the newly systhesized NZVI. Decomposing pollutants in the aqueous solution with columns packed with NZVI immobilized on the cation exchange resin is a promising technology that can solve the reclaiming and refreshing problem of NZVI.

关键词： azo-dye nanosized-zero valent iron (NZVI) decomposition packing column

Temperature Dependence of Photoinduced Birefringence in an azobenzene Polymer

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Chinese Physics Letters 2007年第2期24卷 450-453页

作者：许洪涛王长顺潘煦张小强王传玉孙存英 Department of Physics Shanghai Jiao Tong University Shanghai 200240

The photoinduced birefringence in an azobenzene polymer is investigated at different temperatures between -20℃ to 50℃. It is found that there is a peak value of photoinduced birefringence in the temperature dependence of the photoinduced birefringence under a certain pumping intensity. With the pump light in 90mW/cm^2, the peak value of the photoinduced birefringence appeared at about 0℃ C. The effect of temperature on the photoinduced birefringence is discussed using the competition mechanism between the photoinduced reorientation and the thermal random motion.

关键词： REVERSIBLE OPTICAL STORAGE azo-dye AMORPHOUS POLYMERS FILMS ORIENTATION BACTERIORHODOPSIN COPOLYMERS ANISOTROPY

Increasing the rewriting speed of optical rewritable e-paper by selecting proper liquid crystals

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Chinese Physics B 2012年第8期21卷 121-125页

作者：耿煜孙嘉瞳 Anatoli Murauski Vladimir Chigrinov 郭海成 Center for Display Research Department of Electrical and Electronic EngineeringHong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Electrical and Electronic Engineering Hong Kong University of Science and TechnologyClear Water Bay KowloonHong KongChina

The effect of interaction between liquid crystal （LC） and photoalignment material on the speed of optical rewriting process is investigated. The theoretical analysis shows that a smaller frank elastic constant K22 of liquid crystal corresponds to a larger twist angle, which gives rise to a larger rewriting speed. Six different LC cells with the same boundary conditions （one substrate is covered with rubbed polyimide （PI） and the other with photo sensitive rewritable sulfuric dye I（SD1）） are tested experimentally under the same illumination intensity （450 nm, 80 mW/cm2）. The results demonstrate that with a suitable liquid crystal, the LC optical rewriting speed for e-paper application can be obviously improved. For two well known LC materials E7 （K22 is larger） and 5CB （K22 is smaller）, they require 11 s and 6 s corresponding to change alignment direction for generating image information.

关键词： azo-dye optical rewritable photoalignment rewriting speed

Synthesis of a New Optoelectronic Material Based on Oriented Adsorption of dyes to Nanoparticles Surface

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Journal of Electronic Science and Technology of China 2005年第3期3卷 256-259页

作者：李贵安宋建平李貅 School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049 China School of Physics and Information Technology Shaanxi Normal University Xi’an 710062 China School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049 China

Synthesis of the optoelectronic storage material with structure for coating by nanosized metal and azo-dye was reported. The characterization of composites was made by using transmission electron microscope （TEM）, ultraviolet-visible spectrometer （UV-Vis） and thermogravity analyzer （TGA）. It is found that, due to the specific structure, in which azo-dye molecules are oriented and adsorbed on the spherical surface of nanosized metal, the absorption maximum of azo-dye methyl orange shift towards shorter wavelength band. The experimental results show that the proposed technique here wouM offer a promising way to synthesize short wavelength optoelectronic storage material by doping of metal nanoparticles coated with dyes in polymer. Furthermore, the composites based on the structure can present excellent thermal properties suitable for the requirements of optical storage. This new type of material is capable of matching semiconductor laser （GaN） in optoelectronic storage technology.

关键词： metal nanoparticles azo-dye oriented adsorption optoelectronic material