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Treatment of 2-phenylamino-3-methyl-6-di-n-butylaminofluoran production effluent by combination of biological treatments and fenton's oxidation

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Journal of Environmental Sciences 2007年第10期19卷 1178-1182页

作者： ding Wei gAO Ying-xin YANg Min ding Ran ZHANg Yu College of Resource and Environmental Engineering East China University of Science and Technology Shanghai 200237 SKLEAC Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

High strength refractory organic stream is produced during the production of 2-phenylamino-3-methyl-6-di-n-butylaminofluoran （One Dye Black 2, abbr. ODB 2）, a novel heat-sensitive material with a promising market. In this study, a combination of acidificationprecipitation, primary biological treatment, fenton＇s oxidation and another biological treatment was successfully used for the removal of COD from 18000-25000 mg/L to below 200 mg/L from the ODB 2 production wastewater in a pilot experiment. A COD removal of 70%-80% was achieved by acidification-precipitation under a pH of 2.5-3.0. The first step biodegradafion permitted an average COD removal of 70% under an hydraulic residence time （HRT） of 30 h. By batch tests, the optimum conditions of fenton＇s oxidation were acquired as： fe^2＋ dose 6.0 mmol/L; H2O2 dose 3000 mg/L; and reaction time 6 h. The second step biological treatment could ensure an effluent COD below 200 mg/L under an HRT of 10 h following the fenton＇s treatment.

关键词： 2-phenylamino-3-methyl-6-di-n-butylaminofluoran ODB 2 wastewater fenton's oxidation activated sludge heatsensitive material

Heterogeneous fenton degradation of azodyes catalyzed by modified polyacrylonitrile fiber fe complexes: QSPR (quantitative structure peorperty relationship) study

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Journal of Environmental Sciences 2013年第7期25卷 1469-1476页

作者： Bing Li Yongchun Dong Zhizhong ding Division of Textile Chemistry & Ecology School of Textiles Tianjin Polytechnic University

The amidoximated polyacrylonitrile （PAN） fiber fe complexeswere prepared and used as the heterogeneous fenton catalysts for thedegradation of28 anionicwater soluble azodyes inwater under visible irradiation. The multiple linear regression （MLR） methodwas employed todevelop the quantitative structure property relationship （QSPR） model equations for thedecoloration and mineralization of azodyes. Moreover, the predictive ability of the QSPR model equationswas assessed using Leave-one-out （LOO） and cross-validation （CV） methods. Additionally, the effect of fe content of catalyst and the sodium chloride inwater on QSPR model equationswere also investigated. The results indicated that the heterogeneous photo-fentondegradation of the azodyeswithdifferent structureswas conducted in the presence of the amidoximated PAN fiber fe complex. The QSPR model equations for thedyedecoloration and mineralizationwere successfullydeveloped using MLR technique. MW/S （molecularweightdivided by the number of sulphonate groups） and N N=N （the number of azo linkage） are considered as the most importantdetermining factor for thedyedegradation and mineralization, and there is a significant negative correlation between MW/S or N N=N anddegradation percentage or total organic carbon （TOC） removal. Moreover, LOO and CV analysis suggested that the obtained QSPR model equations have the better prediction ability. The variation in fe content of catalyst and the addition of sodium chloridedid not alter the nature of the QSPR model equations.

关键词： azodye heterogeneous fentondegradation quantitative structure property relationship polyacrylonitrile fiber fe complex

Variations in rare earth elements with environmental factors in lake surface sediments from 17 lakes in western China

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Journal of Mountain Science 2021年第7期18卷 1811-1822页

作者： DU ding-ding CHEN Liu-qin BAI Yong-hui HU Hai-ping School of Earth Sciences East China University of TechnologyNanchang 330013China State Key Laboratory of Nuclear Resources and Environment Nanchang 330013China School of Earth Sciences Lanzhou UniversityLanzhou 730000China

Numerous lakes in western China are excellent sites for understanding environmental ***,what dominates rare earth element(REE) variations are still under debate in the lake environmental *** this study,we selected 28 surface sediment samples from 17 lakes(*** lakes,small water bodies,etc.) in the QinghaiTibet Plateau and Xinjiang *** samples were analyzed to reveal the behavior of the REEs and major *** REE patterns are characterized by light rare earth element(LREE) enrichment,weak Ce anomaly(0.84-0.98,0.94 on average) and negative Eu anomaly(0.53-1.00,0.67 on average).The homogeneous REE patterns may reflect similar REE of the source ***,the REE abundances showed some significant *** this study,water chemistry data analyses inferred that the highly REE values appear possibly in the saltwater lake,and also related to carbonate mineral,whereas p H played a minor role in REE *** large-scale lakes(*** Bosten and Lake Ulungur),the results showed that the relatively larger REE values are in the margins of ***,lower REE contents are towards the central *** study suggested that five major factors control the REE contents:(1) The REE tends to increase with the increase of the weathering intensity.(2) Likewise,heavy mineral(***,anatase,zircon,etc.) are probably primary in these sediments because they are highly enriched in the REE.(3) The contribution of fe-Mn oxides is significant in sediments because their concentrations highly correlate with the REE.(4) The carbonate mineral(mainly calcite) played a significant role on the REE values in the lakes because the REEs are incorporated into the carbonate minerals generating the low REE concentrations.(5) Major element analysis,mineral analysis,and grain-size data analysis showed that the REE distribution is chiefly influenced by finer grain-size component of lake sediments due to the decreasing propor

关键词： Western China Lake surface sediments Rare earth elements Environmental factors

Large magnetostriction of Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)/epoxy composites in a wide temperature range

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Journal of Rare Earths 2024年第4期42卷 705-709页

作者： Hehe ding Yangguang Shi Shaolong Tang MIIT Key Laboratory of Aerospace Information Materials and Physics Department of Applied PhysicsNanjing University of Aeronautics and AstronauticsNanjing210016China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing210093China

We report the magnetostrictive performance of the Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)/epoxy *** of M?ssbauer spectra and the XRD results indicate that the easy magnetic direction of the Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)compound is alongdirection with spontaneous magnetostrictionλ111 of1900 ***-oriented Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)/epoxy composites with particle volume fractions of20 vol%-55 vol%were *** measurements demonstrate that the composite is highly *** raw material cost of Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)is about 85%of that of the Terfenol-D(Tb_(0.3)Dy_(0.7)fe_(2))***_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)/epoxy composites possess comparable magnetostriction with those composites made of Tb_(0.3)Dy_(0.7)fe_(2)*** room temperature,the magnetostrictionλ_Ⅱof the Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93)/epoxy composite reaches 420 ppm at a low field of 80 kA/m and about1000 ppm at 239 kA/*** addition,the composite exhibits a large saturation magnetostrictionλ_Ⅱover1200 ppm from 300 to 100 K,suggesting its potential applications as a low-cost magnetostrictive material in a wide temperature ***,the current study offers an opportunity to widen the operating temperature range of the magnetostrictive composite.

关键词： Magnetostrictive composite Nd_(0.2)Tb_(0.3)Dy_(0.5)fe_(1.93) Wide temperaturerange Laves phase Rare earths

Effect of Co substitution on the glass forming ability and magnetocaloric effect of fe88Zr8B4 amorphous alloys

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Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 81-84页

作者： LiangHua gan LiYan Ma BenZhen Tang ding ding Lei Xia Laboratory for Microstructure Institute of Materials Shanghai University Shanghai 200072 China

As greater attention is paid to energy consumption and global warming, magnetic refrigeration （MR） technologies based on the magneto-caloric effect （MCE） have been developed. Systems based on MR are expected to be more compact, energy efficient, and environmentally safe compared with traditional vapor-cycle refrigeration technologies .

关键词： Effect of Co substitution on the glass forming ability and magnetocaloric effect of fe Co Figure Zr8B4 amorphous alloys

Synthesis of Nife_2O_4 nanoparticles by a low temperature microwave-assisted ball milling technique

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Science China(Technological Sciences) 2012年第6期55卷 1535-1538页

作者： CHEN ding ZHANg YingZhe College of Materials Science and Engineering Hunan UniversityChangsha 410082China

Nanocrystalline Nife2O4 particles with mean size of about 20 nm were directly synthesized by a novel microwave-assisted ball-milling approach, using basic nickel carbonate and iron powders as the raw materials. The results showed that an interme- diate product fe2Ni2（OH）sCO3 · 2H2O was formed by milling NiCO3 · 2Ni（OH）2· 4H2O and fe powders with microwave assis- tance, then this intermediate product further reacted to form Nife2O4 nanocrystals. On the other hand, by using NiO and fe2O3 as the raw materials, Nife2O4 could not be able to form. Nife2O4 nanocrystals could be directly synthesized without post-sintering by this process. This makes it a new promising approach for ferrite nanoparticle, which is simple and environ- mentally friendly.

关键词： Nife2O4 nanoparticles microwave ball milling

Measurements of spectral lines observed with Hinode/EIS as implications for coronal heating

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Research in Astronomy and Astrophysics 2009年第7期9卷 829-840页

作者： Ying Li Ming-De ding Department of Astronomy Nanjing University Nanjing 210093 China

We have measured the line widths and nonthermal velocities in 12 solar regions using high resolution EUV data taken by Hinode/EIS. We find that there exists a positive correlation between the intensity and nonthermal velocity for the fe xII emission line as well as some other lines. The correlation coefficients decrease from the disk center to the limb. However, the nonthermal velocities of a particular spectral line do not vary much in different regions, so they are considered isotropic. In particular, we find that for a coronal loop structure, the largest widths and nonthermal velocities occur at the footpoints, where outflows appear. Based on these observational results, we discuss several physical processes responsible for coronal heating.

关键词： line: profiles - Sun: corona - Sun: UV radiation

Was the Panzhihua Large fe-Ti Oxide Deposit,SW China,Formed by Silicate Immiscibility?

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Acta geologica Sinica(English Edition) 2023年第5期97卷 1451-1461页

作者： ding Xiangli CHEN Xuanhua SHAO Zhaogang Chinese Academy of geological Sciences Beijing 100037China

The Panzhihua mafic intrusion,which hosts a world-class fe-Ti-V ore deposit,is in the western Emeishan region,SW *** formation age(~260 Ma),and Sr and Nd isotopes indicate that the Panzhihua intrusion is part of the Emeishan large igneous province and has little crustal *** assess ore genesis of the Panzhihua fe-Ti-V ore deposit,two different models have been provided to explain the formation,namely silicate immiscibility and normal fractional *** immiscibility occurring around 1,000℃at the late stage of basaltic magma evolution argues against the silicate immiscibility ***-hosted melt inclusion research indicates that silicate immiscibility occurred at the late stage of Panzhihua magma evolution,which may not have offered potential to form such large ore deposits as ***,continuous compositional variations of the Panzhihua intrusion and calculations using thermodynamic modelling software support the hypothesis that the Panzhihua deposit was formed by normal fractional *** trace element patterns of the Panzhihua intrusion and nearby felsic rocks also coincide with the fractional crystallization *** fractional crystallization of high-Ti basaltic magma played a key role in the formation of the Panzhihua fe-Ti-V ore deposit.

关键词： liquid immiscibility fractional crystallization mafic intrusion fe-Ti oxide deposit Panzhihua

Synthesis of fe_3O_4 nanoparticles by wet milling iron powder in a planetary ball mill

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China Particuology 2007年第5期5卷 357-358页

作者： ding Chen Song Ni Zhenhua Chen Institute for Materials Research Hunan University Changsha 410082 China

fe3O4 nanoparticles with sizes ranging from 30 to 80 nm were synthesized by wet milling iron powders in a planetary ball mill. The phase composition and the morphologies of the as-synthesized products were measured by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. Nanosized fe3O4 particles were prepared by wet milling metallic iron powder （-200 mesh, 99%） in a planetary ball mill equipped with stainless steel vials using iron balls under distilled water with a ball-to-powder mass ratio of 50：1 and at a rotation speed of 300 rpm. The use of the iron balls in this method played a key role in fe3O4 formation. The present technique is simple and the process is easy to carry out.

关键词： fe3O4 Wet milling Planetary ball mill