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Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange,crystal violet and indigo carmine dyes in tungsten bulb/sunlight

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稀土学报:英文版 2023年第9期41卷 1311-1322,I0002页

作者： Brajendra Singh Priyanka Singh Saiqua Siddiqui Divyanshu Singh Mukul Gupta Materials Chemistry Lab Centre of Material SciencesUniversity of AllahabadPrayagraj21002India ugc-dae consortium for scientific research University CampusKhandwa Road Indore452001India

We documented(ⅰ) the decolorization of wastewater in visible light,which contains methyl orange,crystal violet and indigo carmine dyes,using La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1 and 0.5) manganites and(ⅱ) efficient separation of photocatalysts from water using magnetic *** ceramic photocatalysts were sintered at 1050℃ for 12 *** were characterized by X-ray diffraction(XRD),soft X-ray absorption spectroscopy(SXAS),Fourier transform infrared spectroscopy(FTIR) and UV-visible diffuse reflectance spectroscopy(DRS).SXAS studies show the presence of Mn(Mn^(3+)/Mn^(4+)) and Fe(Fe^(3+)/Fe^(4+)) mixes valences in Fe-doped *** band gap is found in visible light range for La_(0.7)Sr_(0.3)Mn_(1-x)Fe_(x)O_(3)(x=0.0,0.05,0.1) ***_(0.7)Sr_(0.3)MnO_(3) degrades 94.6% methyl orange in7 min,81.9% crystal violet in 10 min and 99.1% indigo carmine in 5 ***_(0.7)Sr_(0.3)Mn_(0.9)Fe_(0.1)O_(3) degrades the 92.6% methyl orange dye solution in 9 min,94.8% crystal violet in 25 min and 97.1% indigo carmine in3 *** and Fe doped manganites can be separated in 60 s from wastewater.

关键词： Synchrotron X-ray absorption Dye degradation Magnetic separation Mixed valences Rare earths Wastewater treatment

Dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi_(5)Ti_(3)FeO_(15)

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1063-1071页

作者： Rasmita Jena K.Chandrakanta P.Pal Md.F.Abdullah S.D.Kaushik A.K.Singh Department of Physics and Astronomy National Institute of Technology RourkelaRourkela-769008OdishaIndia ugc-dae consortium for scientific research mumbai Centre BARCMumbai-400085India

For this study,we synthesized Aurivillius Bi_(5)Ti_(3)FeO_(15) ceramic using the generic solid-state reaction route and then performed roomtemperature X-ray diffraction to confirm that the compound had a single phase with no *** surface morphology of the prepared sample was observed to contain microstructural grains approximately 0.2–2μm in *** dielectric properties of the sample were determined as a function of frequency in a range of approximately 100 Hz to 1 MHz at various temperatures(303 K≤T≤773 K).Nyquist plots of the impedance data were found to exhibit a semi-circular arc in the high-temperature region,which is explained by the equivalent electrical circuit(R_(1)C_(1))(R_(2)QC_(2)),where R_(1) and R_(2) represent the resistances associated with the grains and grain boundaries,respectively,C_(1) and C_(2) are the respective capacitances,and Q is the constant phase element(CPE),which accounts for non-Debye type of *** results indicate that both the resistance and capacitance of the grain boundaries are more prominent than those of the *** alternating current(ac)conductivity data were analyzed based on the Jonscher universal power law,which indicated that the conduction process is dominated by the hopping *** calculated activation energies of the relaxation and conduction processes were very similar(0.32 to 0.53 eV),from which we conclude that the same type of charge carriers are involved in both processes.

关键词： Nyquist plot impedance spectroscopy activation energy ac conductivity hopping

Measurement of neutron capture cross section on^(71)Ga at 2.15 and 3.19 MeV and uncertainty propagation and covariance analysis

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Chinese Physics C 2023年第7期47卷 72-80页

作者： Rebecca Pachuau A.Gandhi Namrata Singh A.Kumar Mayur Mehta S.V.Suryanarayana L.S.Danu B.K.Nayak B.Lalremruata Department of Physics Banaras Hindu UniversityVaranasi-221005India Institute for Plasma research Gandhinagar-382428India Nuclear Physics Division Bhabha Atomic Research CentreMumbai-400085India Homi Bhabha National Institute AnushaktinagarMumbai-400094India Department of Physics Mizoram UniversityTanhrilAizawl-796004India Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN-HH Bucharest077125Romania MCNS Manipal Academy of Higher EducationManipal 576104India

The cross section values of the^(71)Ga(n,γ)^(72)Ga reaction are measured,which are 9.14±0.81 mb and 5.74±0.50 mb at 2.15 and 3.19 MeV,*** detailed uncertainty propagation and covariance analysis are also ***^(7)Li(p,n)^(7)Be reaction was used to generate the neutrons,and the neutron flux was normalized using the^(115)In(n,n′)^(115)In^(m)monitor *** measured cross section data are compared with the data available in the EXFOR database,the data obtained using nuclear reaction model codes EMPIRE-3.2 and TALYS-1.95,and also the evaluated nuclear data from ENDF/B-VIII.0 and JEFF-3.1/*** comparison shows that our result at 3.19 MeV is in good agreement with those of EMPIRE-3.2 and JEFF-3.1/*** there are no other measurements available at3.19 MeV,our data could not be compared with literature data at 3.19 MeV,but they are consistent with the cross section values available at 2.98±0.26 and 3.0±0.1 *** result at 2.15 MeV is slightly higher than the literature value available in EXFOR,evaluated value,and theoretically predicted result.

关键词： neutron capture cross section gallium uncertainty propagation and covariance analysis

Development of CeO_2 nanorods reinforced electrodeposited nickel nanocomposite coating and its tribological and corrosion resistance properties

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Journal of Rare Earths 2018年第12期36卷 1319-1325页

作者： S.Shanmugasamy K.Balakrishnan A.Subasri S.Ramalingam A.Subramania Centre for Nanoscience and Technology Pondicherry University Department of Chemistry Kalasalingam University

A simple electrodeposition technique was used to prepare Ni-CeOnanorods composite coating(Ni-CeONRs) using Watt’s nickel plating bath containing CeOnanorods(NRs) as the reinforcement phase under optimized process conditions. The X-ray diffraction analysis(XRD) was used for the structural analysis of Ni-CeONRs composite coatings and their average crystalline size is ～22 nm for pure Ni and ～18 nm,respectively. The crystalline structure is fcc for the Ni-CeOnanocomposite coatings. The surface morphology of the electrodeposited Ni-CeONRs composite coatings was analyzed by scanning electron microscopy(SEM). Microhardness of pure Ni and Ni-CeONRs composite coatings are found to be 253 HV and 824 HV, respectively. The inclusion of CeONRs increases the microhardness of Ni-CeONRs composite coatings. The corrosion resistance behavior of Ni-CeONRs composite coating was evaluated by Tafel polarization and AC impedance methods. It is revealed that CeONRs reinforced Ni matrix shows higher microhardness and corrosion resistance than existing reported electrodeposited pure Ni and CeOnanoparticles reinforced Ni coatings.

关键词： CeO_2 nanorods Rare earths Electrodeposition Nanocomposite coating Microhardness

Measurement of(n,α)and(n,2n)reaction cross sections at a neutron energy of 14.92±0.02 MeV for potassium and copper with uncertainty propagation

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Chinese Physics C 2022年第1期46卷 110-117页

作者： A.Gandhi Aman Sharma Rebecca Pachuau1 Namrata Singh L.S.Danu S.V.Suryanarayana B.K.Nayak A.Kumar Department of Physics Banaras Hindu UniversityVaranasi 221005India Nuclear Physics Division Bhabha Atomic Research CentreMumbai 400085India

Experimentally measured neutron activation cross sections are presented for the ^(65)Cu(n,0)^(62m)Cu,^(41) K(n,a)^(38C)l,and ^(65)Cu(n.2n)^(64)Cu reactions with detailed uncertainty *** neutron cross secions were measured at an incident energy of 14.92±0.02 MeV,and the neutrons were based on the(d,n)a fusion *** ^(27) Al(n,a)^(24)Na reaction was used as a reference reaction for the normalization of the neutron *** pre-calib-rated lead-shielded HPGe detector was used to detect the residues'γ-ray *** data from the measured cross sections are compared to the previously measured cross sections from the EXFOR database,theoretically calculated cross sections using the TALYS and EMPIRE codes,and evaluated nuclear data.

关键词： nuclear reactions (n,a)and(n,2n)reactions t(c/,n)a neutron source uncertainty propagation covariance analysis TALYS-1.9 and EMPIRE-3.2 code

Capture and fission analysis of various superheavy isotopes with ACN=258-280

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Communications in Theoretical Physics 2020年第2期72卷 65-74页

作者： Gurjit Kaur Manoj K Sharma School of Physics and Materials Science Thapar Institute of Engineering and TechnologyPatiala—147004PunjabIndia

The capture and fission analysis of heavy ion induced fusion reactions leading to the formation of Z=107-111 superheavy nuclei has been carried *** have been made to analyze the synthesis traits,such as excitation functions,formation probabilities,barrier characteristics *** l-summed Wong model provides a decent description of available data on capture(σCap)and fusion-fission(σff)cross-sections and hence is exploited to make relevant predictions for future *** capture and fusion-fission excitation functions are predicted for the least explored region of superheavy nuclei(SHN)i.e.Z=*** role of massasymmetry(η),Coulomb factor(ZPZT)deformation and orientations,Businari-Gallone massasymmetry(αBG)fission barrier(Bf)etc is duly *** present study concludes that the mass-asymmetric reactions involving 24Mg,30Si,and 36S projectiles are preferred for the synthesis of unknown isotopes of Z=***,the doubly magic 48Ca-projectile also provides a competing alternative to produce neutron-rich isotopes of the abovementioned SHN.

关键词： Capture and fission cross-section compound nucleus formation probability quasi-fission

Optimization and application of UVC irradiation for prevention of fungal biodeterioration of vegetable tanned and chrome tanned leather

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Journal of Leather Science and Engineering 2022年第2期4卷 380-393页

作者： Eshita Jhahan Subarna Bhattacharyya Anirban Chaudhuri Nirmal Sarkar Shaheen Akhtar Punarbasu Chaudhuri School of Environmental Studies Jadavpur UniversityKolkata 700032India Department of Environmental Science University of CalcuttaKolkataIndia.

UV-C irradiation critically effects the growth of micro-fungi and also deteriorate leather materials. In the present study vegetable tanned and chrome tanned leather were infected with pure cultures of Aspergillus niger and Aspergillus flavus, which were isolated from stored leather materials. UV-C light (λ = 254 nm) was applied on infected leather for 15 and 60 min. The changes in leather qualities were examined through weight, tensile strength, scanning electron microscope, energy dispersive X-ray and Fourier transform infrared spectroscopy study after 15 and 30 days of fungal inoculation. Vegetable tanned leather was more vulnerable in case of fungal attack than chrome tanned leather while A. flavus showed more influence on leather deterioration than A. niger. The results showed that weight loss after 30 days for 15 and 60 min irradiation exposure was 1.3% compared to A. flavus infected leather (3.93%). The tensile strength of vegetable and chrome tanned UV irradiated leather was increased by 44% and 7% respectively. The scanning electron microscopic images exhibit the limited presence of conidiophores in UV-C exposed leather which confirmed the potentiality of irradiation for controlling fungal growth. The infrared spectral analysis of UV-C exposed infected leather samples showed neither shifting of wavenumber nor displacement of any functional groups. Alto-gether the efficacy of UV-C irradiation against biodeterioration of leather was concluded to be effective. This method can be used to control fungal growth without compromising the leather quality.

关键词： Aspergillus Biodeterioration Leather SEM Tensile strength UV-C

Defect induced room-temperature ferromagnetism and enhanced photocatalytic activity in Ni-doped ZnO synthesized by electrodeposition

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Chinese Physics B 2020年第10期29卷 566-572页

作者： Deepika Raju Kumar Ritesh Kumar Kamdeo Prasad Yadav Pratyush Vaibhav Seema Sharma Rakesh Kumar Singh Santosh Kumar College o f Commerce Arts and SciencePatna.BiharIndia Jaypee University o f Engineering and Technology GunaMadhya PradeshIndia Anugrah Narayan College PatnaBiharIndia Aryabhatta Knowledge University PatnaBiharIndia

Zn0.90Ni0.10O nanoparticles have been synthesized by single-bath two-electrode electrodeposition at constant voltage. X-ray diffraction, UV vis and photoluminescence studies reveal that a single-phase polycrystalline hcp wurtzite crystal structure of ZnO is evolved. The material consists of a large number of defects such as oxygen vacancy (Ov) and zinc interstitial (Zi). The magnetization study reveals that the sample exhibits room-temperature global ferromagnetism and the ferromagnetic ordering seems to be defect induced via bound magnetic polaron mechanism, and double exchange is also expected to have played role. Interesting optoelectronic properties have been found in the synthesized sample and the material seems to be a potential candidate to be used as a UV sensor. Such a transition metal doped ZnO based dilute magnetic semiconducting system exhibiting room-temperature ferromagnetism is likely to be first of its kind in the sense that such materials have not yet been reported to be synthesized by the simple method of electrodeposition to the best of our knowledge on the basis of ample literature review.

关键词： dilute magnetic semiconductors(DMS) bound magnetic polaron photoluminescence ferromagnetism

快速热处理化学气相沉积法制备用于电子产品热管理的轻质柔性石墨烯

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新型炭材料（中英文） 2023年第3期38卷 534-542页

作者： Satendra Kumar Manoj Goswami Netrapal Singh Uday Deshpande Surender Kumar N.Sathish Academy of scientific and Innovative research(AcSIR) Ghaziabad 201002India CSIR-Advanced Materials and Processes research Institute(AMPRI) Bhopal 462026India ugc-dae consortium for scientific research University CampusIndore 452001India

下一代电子产品的飞速发展对热管理提出了更高的要求。初始石墨烯的导热性是铜的13倍。本文通过快速热处理化学气相沉积(RTP-CVD)法制备了具有大sp^(2)结构域的单层、双层和多层石墨烯(SLG、BLG、FLG),进一步通过低浓度H_(2)还原制备了... 详细信息

下一代电子产品的飞速发展对热管理提出了更高的要求。初始石墨烯的导热性是铜的13倍。本文通过快速热处理化学气相沉积(RTP-CVD)法制备了具有大sp^(2)结构域的单层、双层和多层石墨烯(SLG、BLG、FLG),进一步通过低浓度H_(2)还原制备了高导热石墨烯。在1000℃下生长25 min制备出SLG,利用拉曼光谱和透射电子显微镜(TEM)研究了石墨烯的品质。为了验证RTP-CVD法生成的石墨烯的散热能力,将其作为2TB固态硬盘的散热器,通过红外热成像仪进行了研究。结果证明,RTP-CVD生长的石墨烯用于消费电子产品的热管理测试时性能表现优异。SLG显示温度(最高)比商用铜散热器低5℃,SLG的散热能力比商用铜散热器快200倍左右。综上,利用RTP-CVD法制备的轻质的柔性石墨烯可以成为下一代5G设备和消费电子产品热管理的更好选择。

关键词：石墨烯热管理消费类电子产品化学气相沉积