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Photocatalytic activity of Fe-doped CaTiO_3 under UV–visible light

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Journal of Environmental Sciences 2014年第7期26卷 1489-1495页

作者： He Yang Chong Han xiangxin xue School of Materials and Metallurgy Northeastern University

The photocatalytic degradation of methylene blue（MB） over Fe-doped CaTiO3 under UV-visible light was investigated. The as-prepared samples were characterized using X-ray diffraction（XRD）, scanning electron microscope（SEM） equipped with an energy dispersive spectrometer（EDS） system, Fourier transform infrared spectra（FT-IR）, and UV-visible diffuse reflectance spectroscopy（DRS）. The results show that the doping with Fe significantly promoted the light absorption ability of CaTiO3 in the visible light region. The Fe-doped CaTiO3 exhibited higher photocatalytic activity than CaTiO3 for the degradation of ***, the photocatalytic activity of the Fe-doped CaTiO3 was greatly influenced by the calcination temperature during the preparation process. The Fe-doped CaTiO3 prepared at500°C exhibited the best photocatalytic activity, with degradation of almost 100% MB（10 ppm）under UV-visible light for 180 min.

关键词： Fe-doped CaTiO3 Methylene blue Photocatalytic activity UV-visible light

Kinetics of Photocatalytic Degradation of Methylene Blue Over CaTiO_3

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 1103-1107页

作者：韩冲 YANG He xue xiangxin School of Materials & Metallurgy Northeastern University

Kinetics of photocatalytic degradation of methylene blue(MB) over Ca Ti O3 was studied. Effects of the solution p H, the MB concentration, the Ca Ti O3 dosage, and the type of light source on photocatalytic degradation rate of MB over Ca Ti O3 were investigated in detail. The results show that photocatalytic degradation of MB over Ca Ti O3 followed the first-order reaction. The apparent rate constant(kobs) of MB significantly increased with increasing solution p H while it greatly decreased with increasing MB concentration. The kobs of MB increased with increasing Ca Ti O3 dosage from 0.05 to 0.1 g, whereas it slightly decreased with increasing Ca Ti O3 dosage in the range of 0.1-0.4 g. The kobs of MB under UV-visible light irradiation was larger by factors of 2.2 than that under visible light irradiation. The kobs of MB was(4.8±0.3)×10-1h-1 under optimal conditions with the solution p H of 11, the MB concentration of 1 ppm, the Ca Ti O3 dosage of 0.1 g, and UV-visible light irradiation.

关键词： CaTiO3 methylene blue photocatalytic degradation kinetics

Removal kinetics of phosphorus from synthetic wastewater using basic oxygen furnace slag

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Journal of Environmental Sciences 2015年第4期27卷 21-29页

作者： Chong Han Zhen Wang He Yang xiangxin xue School of Materials & Metallurgy Northeastern University

Removal kinetics of phosphorus through use of basic oxygen furnace slag（BOF-slag）was investigated through batch experiments. Effects of several parameters such as initial phosphorus concentration, temperature, BOF-slag size, initial p H, and BOF-slag dosage on phosphorus removal kinetics were measured in detail. It was demonstrated that the removal process of phosphorus through BOF-slag followed pseudo-first-order reaction kinetics. The apparent rate constant（kobs） significantly decreased with increasing initial phosphorus concentration, BOF-slag size, and initial p H, whereas it exhibited an opposite trend with increasing reaction temperature and BOF-slag dosage.A linear dependence of kobson total removed phosphorus（TRP） was established with kobs=（3.51 ± 0.11） × 10^-4× TRP. Finally, it was suggested that the Langmuir–Rideal（L–R）or Langmuir–Hinshelwood（L–H） mechanism may be used to describe the removal process of phosphorus using BOF-slag.

关键词： Basic oxygen furnace slag Phosphorus Kinetics Apparent rate constant

Significant influences of TiO_(2)crystal structures on NO_(2)and HONO emissions from the nitrates photolysis

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Journal of Environmental Sciences 2021年第4期33卷 198-206页

作者： Wenwen Xu Wangjin Yang Chong Han He Yang xiangxin xue School of Metallurgy Northeastern UniversityShenyang 110819China

The emissions of NO_(2)and HONO from the KNO_(3)photolysis in the presence of TiO_(2)were measured using a round-shape reactor coupled to a NO_(x)***_(2)played important roles in the emission flux density of NO_(2)(R_(NO_(2)))and HONO(R HONO),depending on crystal structures and mass ratios of TiO_(2).R NO_(2)and R HONO significantly decreased with increasing the rutile and anatase mass ratios from 0 to 8 and 0.5 wt.%,***,with further increasing the anatase mass ratio to 8 wt.%,there was an increase in R_(NO_(2))and R HONO.R NO_(2)on KNO_(3)/TiO_(2)/SiO_(2)had positive correlation with the KNO_(3)mass(1–20 wt.%),irradiation intensity(80–400 W/m^(2))and temperature(278–308 K),while it had the maximum value at the relative humidity(RH)of 55%.R HONO on KNO_(3)/TiO_(2)/SiO_(2)slightly varied with the KNO_(3)mass and temperature,whereas it increased with the irradiation intensity and *** addition,the mechanism for NO_(2)and HONO emissions from the nitrates photolysis and atmospheric implications were discussed.

关键词： TiO_(2) Nitrates Photolysis NO_(2)

Fungal diversity in major oil-shale mines in China

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Journal of Environmental Sciences 2016年第3期28卷 81-89页

作者： Shaoyan Jiang Wenxing Wang xiangxin xue Chengyou Cao Ying Zhang College of Life and Health Sciences Northeastern University School of Materials and Metallurgy Northeastern University

As an insufficiently utilized energy resource,oil shale is conducive to the formation of characteristic microbial communities due to its special geological ***,little is known about fungal diversity in oil *** chain reaction cloning was used to construct the fungal ribosomal deoxyribonucleic acid internal transcribed spacer（r DNA ITS）clone libraries of Huadian Mine in Jilin Province,Maoming Mine in Guangdong Province,and Fushun Mine in Liaoning *** culture and molecular identification were applied for the isolation of cultivable fungi in fresh oil shale of each *** of clone libraries indicated that each mine had over 50% Ascomycota（58.4%–98.9%）and 1.1%–13.5%unidentified *** Mine and Huadian Mine had 5.9% and 28.1% Basidiomycota,*** Mine showed the highest fungal diversity,followed by Fushun Mine and Maoming *** indexes showed that the similarities between any two of three fungal communities at the genus level were very low,indicating that fungi in each mine developed independently during the long geological adaptation and formed a community composition fitting the *** the fresh oil-shale samples of the three mines,cultivable fungal phyla were consistent with the results of clone *** genera and several unidentified fungi were identified as Ascomycota and Basidiomycota using pure *** was the only genus found in all three *** findings contributed to gaining a clear understanding of current fungal resources in major oil-shale mines in China and provided useful information for relevant studies on isolation of indigenous fungi carrying functional genes from oil shale.

关键词： Oil shale Fungal diversity Clone library rDNA ITS Pure culture

Influence of Coke Content on Sintering Process of Chromium-containing Vanadium-titanium Magnetite

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Journal of Wuhan University of Technology(Materials Science) 2018年第1期33卷 68-72页

作者：周密杨松陶 JIANG Tao xue xiangxin School of Metallurgy Northeastern University Key Laboratory of Liaoning Province for Recycling Science of Metallurgical Resources School of Materials and Metallurgy University of Science and Technology Liaoning

The sintering of chromium-containing vanadium-titanium magnetite using different coke contents was studied through the sintering pot tests, X-ray diffraction analysis and mineralogical phase analysis. Results showed that, as the coke content increased from 3.2% to 4.4%, the liquid phase and combustion zone thickness increased while the vertical sintering rate and ratio of sintered product decreased. In addition, the combustion ratio of exhaust gas also increased with increasing the coke content, indicating that combustion zone temperature also increased, and the excessive the coke content in the sintering process of vanadiumtitanium magnetite is harmful. As the coke content increased, the magnetite, silicates, and perovskite contents of the sintered ore increased while the contents of hematite and calcium ferrite of sintered ore decreased; drum strength decreased, and reduction degradation properties increased while reduction ability decreased. We found that the appropriate coke content for the sintering process is 3.6 wt%.

关键词： chromium-containing vanadium-titanium magnetite sintered ore coke content mineralogical phases

Kinetics and mechanism of hexavalent chromium removal by basic oxygen furnace slag

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Journal of Environmental Sciences 2016年第8期28卷 63-71页

作者： Chong Han Yanan Jiao Qianqian Wu Wangjin Yang He Yang xiangxin xue School of Metallurgy Northeastern University

Basic oxygen furnace slag（BOFS） has the potential to remove hexavalent chromium（Cr（VI））from wastewater by a redox process due to the presence of minerals containing Fe2＋. The effects of the solution p H, initial Cr（VI） concentration, BOFS dosage, BOFS particle size, and temperature on the removal of Cr（VI） was investigated in detail through batch tests. The chemical and mineral compositions of fresh and reacted BOFS were characterized using scanning electron microscope（SEM） equipped with an energy dispersive spectrometer（EDS）system and X-ray diffractometer（XRD）. The results show that Cr（VI） in wastewater can be efficiently removed by Fe2＋released from BOFS under appropriate acidic conditions. The removal of Cr（VI） by BOFS significantly depended on the parameters mentioned above. The reaction of Cr（VI） with BOFS followed the pseudo-second-order kinetic model. Fe2＋responsible for Cr（VI） removal was primarily derived from the dissolution of Fe O and Fe3O4 in BOFS. When H2SO4 was used to adjust the solution acidity, gypsum（Ca SO4·2H2O）could be formed and become an armoring precipitate layer on the BOFS surface, hindering the release of Fe2＋and the removal of Cr（VI）. Finally, the main mechanism of Cr（VI） removal by BOFS was described using several consecutive reaction steps.

关键词： Hexavalent chromium Basic oxygen furnace slag Fe2+ Redox process Kinetics

COUPLING PROCESS FOR Ti AND Si BETWEEN TITANIA SLAGS AND Cu MELTS AT 1500 ℃

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中国有色金属学会会刊：英文版 1995年第2期5卷 34-38页

作者： xue,xiangxin Che,Yinchang (Department of Ferrous Metallurgy, Northeastern University, Shenyang 110006) Northeastern Univ Shenyang China

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ＣＯＵＰＬＩＮＧＰＲＯＣＥＳＳＦＯＲＴｉＡＮＤＳｉＢＥＴＷＥＥＮＴＩＴＡＮＩＡＳＬＡＧＳＡＮＤＣｕＭＥＬＴＳＡＴ１５００℃￥Ｘｕｅ，Ｘｉａｎｇｘｉｎ；Ｃｈｅ，Ｙｉｎｃｈａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＦｅｒｒｏｕｓＭｅｔａｌｌｕｒｇｙ，Ｎｏｒｔｈｅａ...

关键词： coupling reaction apparent mass transfer coefficient titania slag Cu melt

Effects of boron number per unit volume on the shielding properties of composites made with boron ores from China

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Nuclear Science and Techniques 2012年第6期23卷 344-348页

作者： LI Zhefu xue xiangxin LIU Sulan LI Yong DUAN Peining School of Materials & Metallurgy Northeastern University Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resources and Materials

The total macroscopic removal cross sections,deposited energies and the absorbed doses of three new shielding composites loaded with specific boron-rich slag,boron concentrate ore and boron mud of China for 252Cf neutron source were investigated by experimental and Monte Carlo *** results were evaluated by boron mole numbers per unit volume in *** half value layers of the composites were calculated and compared with that of Portland concrete,indicating that ascending boron mole numbers per unit volume in the composites can enhance the shielding properties of the composites for 252Cf neutron source.

关键词：复合材料屏蔽性能硼矿石体积单位蒙特卡罗计算中国吸收剂量