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可循环使用的Sn-TiO_2/聚噻吩纳米杂化材料用于可见光下降解有机污染物(英文) 被引量:3
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作者 M.Ravi Chandra T.Siva Rao b.sreedhar 《催化学报》 SCIE CAS CSCD 北大核心 2015年第10期1668-1678,共11页
采用改进的溶胶-凝胶法在低温制备了Sn-Ti O2/聚噻吩纳米杂化材料(SPNH),运用X射线衍射(XRD)、扫描电镜、X射线光电子能谱(XPS)、红外光谱(IR)、紫外-可见光漫反射光谱(UV-DRS)和BET比表面积分析对所制样品进行了表征.XRD结果证实聚噻吩... 采用改进的溶胶-凝胶法在低温制备了Sn-Ti O2/聚噻吩纳米杂化材料(SPNH),运用X射线衍射(XRD)、扫描电镜、X射线光电子能谱(XPS)、红外光谱(IR)、紫外-可见光漫反射光谱(UV-DRS)和BET比表面积分析对所制样品进行了表征.XRD结果证实聚噻吩(PTh)对Ti O2晶相结构没有影响.IR和UV-DRS结果表明,在掺杂的金属氧化物与PTh的纳米杂化和结合过程中,PTh表面与金属氧化物之间存在相互作用(类似核壳结构).XPS结果显示,纳米杂化材料中存在Sn4+以及PTh与Ti O2各自所含的元素.催化剂表面吸附污染物结果发现,SPNH的吸附容量高于Sn-Ti O2纳米粒子(STN).在可见光下降解有机污染物硝基苯(NB)和孔雀绿(MG)的反应中,SPNH表现出比单纯STN更高的光催化活性和稳定性.由于STN上存在聚噻吩,使得样品表面吸附NB(24%)和MG(21%)的能力增加,从而导致更高的光催化收率.考察了该光催化剂在可见光下重复使用5次时的光催化活性,未见PTh的消耗和降解.这些高光催化活性的SPNH材料有望在工业水净化中用作光催化剂. 展开更多
关键词 二氧化钛 聚噻吩 纳米杂化材料 硝基苯 孔雀绿 可见光 光催化 可循环使用性
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Lactobionic Acid as a New Synergist in Combination with Phosphonate-Zn(Ⅱ)System for Corrosion Inhibition of Carbon Steel 被引量:2
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作者 S.Srinivasa Rao b.V.Appa Rao +1 位作者 S.Roopas Kiran b.sreedhar 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2014年第1期77-89,共13页
Studies on lactobionic acid introduced as a synergist in the presence of phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and zinc ions for corrosion control of carbon steel in aqueous environment are presented. The ... Studies on lactobionic acid introduced as a synergist in the presence of phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and zinc ions for corrosion control of carbon steel in aqueous environment are presented. The investigations revealed that lactobionic acid (LBA) acts as an excellent synergist in corrosion inhibition. Optimum concentrations of all the three components of the ternary formulation are established by gravimetric studies. Potentiodynamic polarization studies indicate that the new ternary system is a mixed inhibitor. Impedance studies show that a protective film is formed on the metal surface in the presence of the inhibitor formulation. The film is found to exhibit its protective nature even at higher temperatures up to 60 ~C. Analysis of the protective film by X-ray photoelectron spectroscopy (XPS) and reflection absorption Fourier transform infrared (FTIR) spectroscopy infers the presence of Zn(OH)2, oxides and hydroxides of iron and the inhibitor molecules in the surface film probably in the form of a complex, [Zn(II)-PBTC-LBA]. The morphological studies by scanning electron microscopy (SEM) and the topographical studies by atomic force microscopy (AFM) also indicate the presence of protective film on the metal surface. A plausible mechanism of corrosion inhibition is proposed. 展开更多
关键词 Corrosion inhibitor Carbon steel Synergism X-ray photoelectron spectroscopy Electrochemical impedance spectroscopy
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First observation of microspherule from the infratrappean Gondwana sediments below Killari region of Deccan LIP,Maharashtra(India) and possible implications 被引量:1
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作者 G.Parthasarathy O.P.PANDey +3 位作者 b.sreedhar Mukund Sharma Priyanka Tripathi Nimisha Vedanti 《Geoscience Frontiers》 SCIE CAS CSCD 2019年第6期2281-2285,共5页
A rare occurrence of a microspherule has been found in the infratrappean sediments,encountered below338 m thick Deccan volcanic cover in KLR-1 scientific borehole,drilled in the epicentral zone of the 1993 Killari ear... A rare occurrence of a microspherule has been found in the infratrappean sediments,encountered below338 m thick Deccan volcanic cover in KLR-1 scientific borehole,drilled in the epicentral zone of the 1993 Killari earthquake(Maharashtra,India).Palynological studies of the sediments indicate their age as Early Permian(Asselian,298-295 Ma) for deposition.Transmission electron microscope studies reveal that the spherule from the infratrappeans,is having a similar composition to that of the Neoarchean amphibolite to granulite facies mid crustal basement.The spherule is non-spherical in nature,containing mostly FeO(10.70±0.20 wt.%),CaO(13.8±0.5 wt.%),Al203(7.78±0.30 wt.%),MgO(6.47±0.3 wt.%),Si02(47,46±0.50 wt.%),Ti02(2.47±0.3 wt.%).K20(1.89±0.20 wt.%).and Cl(0.33±0.05 wt.%).Since the Fe composition of the spherule is almost same as the basement rock(10.5 wt.%),and the chlorine content is also in the same range as the basement(0.04-0.24 wt.%),it would suggest possibility of an extraterrestrial impact over the Indian terrain during the erstwhile Gondwana sedimentation period that may be associated with the Permian-Triassic mass extinction,the most severe one in the Earth's history. 展开更多
关键词 DECCAN trap Killari borehole Microspherules Condwana SEDIMENTS TECTONICS P-T impact
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Spectroscopic and fluorescence properties of Sm^(3+)-doped zincfluorophosphate glasses 被引量:1
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作者 V.b.sreedhar Ch.basavapoornima C.K.Jayasankar 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第10期918-926,共9页
Optical absorption and fluorescence spectra of Sm3+-doped zincfluorophosphate glasses with molar composition of 44P2O5+17K20+9Al2O3+(30-χ)ZnF2+χSm2O3 (χ=0.01 mol.%, 0.05 mol.%, 0.1 mol.%, 0.5 mol.%, 1.0 mol... Optical absorption and fluorescence spectra of Sm3+-doped zincfluorophosphate glasses with molar composition of 44P2O5+17K20+9Al2O3+(30-χ)ZnF2+χSm2O3 (χ=0.01 mol.%, 0.05 mol.%, 0.1 mol.%, 0.5 mol.%, 1.0 mol.%, 2.0 and 3.0 mol.%) referred as PKAZFSm were prepared by melt quenching technique and were characterized through Raman, absorption, emission and decay curve analysis. From the absorption spectra, Judd-Ofelt intensity parameters were determined and were used to predict radiative properties such as transition probabilities (AR, radiative lifetimes (τR), branching ratios (βR), effective bandwidths (△λeff) and stimulated emission cross-section (σ(λp)) for the excited 4G5/2 luminescent level. The decay curve for the 4G5/2 level was single exponential for lower concentration and became non-exponential for higher concentrations. The non-exponential nature of the decay curves of the 4G5/2 level increased with increase in Sm3+ ions concentration accompanied by decrease in lifetime due to energy transfer processes among the Sm3+ ions. The non-exponential decay curves was well fitted to the generalized Inokuti-Hirayama model for S=6, indicating that the energy transfer among optically active ions was of dipole-dipole interaction. The cross-relaxation mechanism responsible for the quenching of lifetimes and the effect of variation of concentration on the spectroscopic properties were also discussed. 展开更多
关键词 zincfluorophosphate glasses SAMARIUM Raman spectrum optical properties fluorescence properties rare earths
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